TECHNICAL FREQUENCY ASSIGNMENT CRITERIA For fixed point to point by alicejenny

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									TECHNICAL FREQUENCY ASSIGNMENT
                CRITERIA
  For fixed point-to-point radio services
 with digital modulation operating in the
     frequency range 3.6 to 4.2 GHz.

              June 2003

                              RA 353
                                               Page 2
             Frequency Assignment Criteria: 4GHz Band




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                                                     Frequency Assignment Criteria: 4GHz Band


                                            Foreword
It is required by the Wireless Telegraphy Act, 1949 and 1998 that no radio apparatus shall be
installed or used in the United Kingdom, except under the authority of a licence granted by the
Secretary of State. It is a condition of such a licence that the performance of the radio equipment
meets certain minimum standards laid down in the appropriate Technical Regulation or National
Standard. Compliance will have been demonstrated by submitting the equipment for a type
approval test at an accredited test house.
This document details the frequency assignment criteria and principles that will be employed by
the RA in the selection of frequencies for use by fixed point to point, type approved, digital radio
equipment operating in the band or frequency range specified.
These assignment criteria are subject to updating and amendment, and intending operators /
manufacturers should consult the latest version of this document complete with any amendments.
Single copies of this document are available free from the RA library at the address below:




          ADDRESS:
          Radiocommunications Agency
          Library Services
          Wyndham House
          189 Marsh Wall
          Docklands
          London E14 9SX




          Switchboard and 24 hour enquiry service (for either address):
          Telephone: 020 7211 0502/0505
          Fax:        020 7211 0507




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             Frequency Assignment Criteria: 4GHz Band




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                                                                             Frequency Assignment Criteria: 4GHz Band


                                                              CONTENTS




1. General ............................................................................................................................ 7
                   1.1 Introduction................................................................................................ 7
                   1.2 Licensee's responsibility............................................................................ 7
                   1.3 Link Length Policy ..................................................................................... 7
                   1.4 Other Services........................................................................................... 7
                             1.4.1 Satellite Services .................................................................... 7
                             1.4.2 Point to Multipoint Services..................................................... 7
2. Transmitting and receiving installations........................................................................... 8
                   2.1 General...................................................................................................... 8
                   2.2 Antenna directivity ..................................................................................... 8
                   2.3 Antenna polarisation.................................................................................. 8
                   2.4 Adaptive Transmitter Power Control (ATPC) ............................................ 8
                   2.5 Equivalent isotropically radiated power (EIRP) ......................................... 8
3. Principles of assignment and EIRP derivation................................................................. 8
                   3.1 Normal assignment ................................................................................... 8
                   3.2 Multi-section links and repeater stations ................................................... 8
                             3.2.1 Multi-section links.................................................................... 8
                             3.2.2 Passive Repeaters.................................................................. 9
                   3.3 Go - Return separation.............................................................................. 9
                   3.4 Parallel links operating over the same path .............................................. 9
                   3.5 Antenna discrimination .............................................................................. 9
                   3.6 Path Clearance.......................................................................................... 9
                             3.6.1 Obstructed Paths .................................................................... 9
                   3.7 Path Loss ................................................................................................ 10
                             3.7.1 Median Path Loss ................................................................. 10
                   3.8 Availability................................................................................................ 10
                   3.9 Receiver Input Levels.............................................................................. 10
                   3.10 Fade margin .......................................................................................... 10
                             3.10.1 General ............................................................................... 10
                             3.10.2 Clear-Air Fade Margin......................................................... 10
                             3.10.3 Minimum Fade Margin ........................................................ 11
                   3.11 Equivalent Isotropically Radiated Power calculation ............................. 11
4. Interference assessment ............................................................................................... 11
                   4.1 General.................................................................................................... 11
                   4.2 Interference Limits................................................................................... 11
                   4.3 Co and Adjacent channel limits ............................................................... 11
                   4.4 Multiple interferers................................................................................... 12
5. Channel Plan ................................................................................................................. 12
           5.1 Derivation of radio frequency channels for the band 3.6 -
           4.2 GHz in the UK. ........................................................................................ 12
Annex A: Receiver input levels and interference levels...................................…...............15
Annex B: Wanted to unwanted levels ..............................................................…..............17
Annex C: Detail on Fade Margin Calculation....................................................…..............35
Annex D: Assignments over an obstructed path................................................................37
Annex E: Assigning Passive Repeater Stations.................................................................39
Annex F: High Level Flow Diagram for Recommendation ITU-R P.452........................... 41



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1.    General
1.1 Introduction
This document outlines the frequency assignment criteria and principles that will be employed by
the RA in the selection of frequencies for use by fixed point-to-point digital radio services
operating in the frequency range 3.6 to 4.2 GHz.
The channel plan shall be in accordance with that given in Clause 5.
This document has been generated taking into account the following equipment capacities:
34Mbit/s in 15 MHz channels ----------------Class 2 (EN classification).
2 X 34Mbit/s in 15 MHz channels -----------Class 3 (EN classification).
51 Mbit/s in 15 MHz channels ---------------Class 3 (EN classification).
140/155 Mbit/s in 30 MHz channels---------Class 3 (EN classification).

The equipment performance parameters relating to these capacities can be found in the relevant
UK Interface Regulation.


1.2 Licensee's responsibility
The Foreword of this document states that the establishment, use or installation of transmitting or
receiving apparatus is subject to the issue of a licence by the Secretary of State. The licensee
must ensure that equipment conforms with and is maintained to the standard set out in the
relevant UK Interface Regulation.
1.3 Link Length Policy
The RA operates a link length policy to promote the use of the highest possible frequency band
for the distance over which the link is to operate. Links transferring data rates ≤ 51 Mbit/s will be
licensed where the path length is ≥ 30 km. The minimum path length for 140/155 Mbit/s systems
is 15 km. At distances below this there may be some expectation that a higher frequency band
could be used, depending on the availability of frequencies and equipment.


1.4 Other Services
1.4.1 Satellite Services
The 4 GHz band is shared with the Fixed Satellite Service that operates receiving earth stations in
this band. All link applications will need to be co-ordinated on a national and international basis.
The final procedure and extent of co-ordination is currently under review (July 1998) and may be
subject to change. For up to date clarification, please contact the Radiocommunications Agency.


1.4.2 Point to Multipoint Services
For the UK some portion of the 4GHz point to point channel plan, detailed in Clause 5, will be
given over to point to multipoint services. It may be necessary to carry out some level of co-
ordination with these services. The final procedure and extent of co-ordination is currently under
review (July 1998) both within the RA and on a wider European level within the relevant CEPT
Working Groups and may therefore be subject to change. For up to date clarification, please
contact the Radiocommunications Agency.




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                                                      Frequency Assignment Criteria: 4GHz Band


2.    Transmitting and receiving installations
2.1 General
The transmitting and receiving installations shall conform to Clauses 2.2 and 2.3 below. The
installations shall be implemented in accordance with good engineering practice.
2.2 Antenna directivity
The antenna installation at the licensed premises shall be such that the antenna pattern will not
exceed the co-polar and cross polar RPE given in the relevant equipment specification or UK
Interface Regulation with the zero degree datum being the boresight path between the two
stations. This applies in both the horizontal and elevation planes.
2.3 Antenna polarisation
The linear plane of polarisation of emissions for a particular radio link will be specified by the
Radiocommunications Agency.
The antenna alignment surface shall be aligned as precisely as possible to the true vertical or true
horizontal and the misalignment shall be no greater than 3°.
2.4 Adaptive Transmitter Power Control (ATPC)
In order to help maximise use of the frequency band ATPC must be employed on all bi-directional
radio links (including passive repeater end stations) operating with a normal assigned fade margin
of 20dB or more. ATPC must be activated by detection of a drop in received signal level at the
distant end of the radio link caused by fading along the path. A minimum ATPC range of 10dB
must be used and will be assumed by the assignment tool. In the reduced power configuration the
EIRP must be at least 10dB below the maximum assigned value detailed in section 2.5 below and
will be known as the normal EIRP (See also section 3.11).
ATPC operation will not be assumed for radio links operating with assigned fade margins of 15dB
or for uni-directional links. ATPC operation will be optional for radio links operating with an
assigned fade margin between 15dB and 20dB but will need to be declared by the operator /
applicant.
2.5 Equivalent isotropically radiated power (EIRP)
Where appropriate two values of assigned EIRP will be stated in the licence. The maximum
assigned value of EIRP must not be exceeded under any condition. The normal assigned EIRP is
the level for operation under normal steady propagation conditions during which ATPC has not
been activated. This will also be the level used by the assignment system for interference
assessment purposes. A tolerance of ±3 dB on these assigned values will be allowed in practice.
The upper limit for the maximum EIRP normally assigned will be 50dBW.
For uni-directional links and bi-directional links not employing ATPC the normal assigned EIRP
and the maximum assigned EIRP value will be the same. (i.e. the ATPC range will be 0dB).


3.    Principles of assignment and EIRP derivation.
3.1 Normal assignment
A normal frequency assignment for a single or multi-section bi-directional link shall comprise of a
pair of radio frequencies of corresponding channel number, one from each of the low and high
frequency groups, and antenna polarisation.


3.2 Multi-section links and repeater stations
3.2.1 Multi-section links
In the case of a multi-section link the direction of transmission of the two frequencies shall
alternate for successive repeater sections so that the transmitter frequency assigned to any
station shall be taken from only one of the frequency groups in the lower or upper half of the
band.


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                                                      Frequency Assignment Criteria: 4GHz Band


3.2.2 Passive Repeaters
Passive repeater operation using either back to back antennas or planar reflectors will be allowed
only under certain specific conditions. Use of these systems will be judged on a case by case
basis and are expected to only be used for availabilities of 99.99% or less under the following
conditions:
a) At remote sites power provision is extremely difficult.
b) There is a clear spectrum saving by the use of one repeater station to overcome the
   obstructed path rather than going around the obstruction with two or more conventional links.
c) Use of the higher power needed for this operation does not unnecessarily sterilise surrounding
   area and block further normal assignments.
d) Higher Performance antennas (if available) should be used at the end stations along with as
   large as reasonably possible repeater station antennas to maximise the repeater gain.
Detail of the assignment process modifications to deal with passive repeater operation are given
in Annex E.
3.3 Go - Return separation
The frequency difference between a pair of corresponding go and return frequencies shall be
320MHz.
3.4 Parallel links operating over the same path
In assessing the interference potential between parallel links operating over the same path in this
frequency band, it cannot be assumed that the wanted and interfering signals suffer correlated
fading. Therefore, protection from interferences cannot merely be derived from frequency
separation and cross-polar discrimination (if any).
As a result interference calculations for parallel links will be carried out as detailed in section 4 of
this document. As a guide it is expected that cross-polar operation in adjacent channels may be
possible for “average” links at 99.99% availability but co-polar operation may need to be
separated by at least two channels.
3.5 Antenna discrimination
In assigning frequencies for links which are in the same geographical area due consideration
shall be taken of the antenna discrimination. When available, data derived from a manufacturer
guaranteed RPE will be used and where not available the appropriate RPE specified in the
relevant equipment specification or UK Technical Regulation will be assumed.
3.6 Path Clearance
It will usually be assumed that each hop has a clearance from obstructions of not less than
0.577F between the transmitting and receiving antennas at the two stations under conditions
corresponding to values of the ratio K greater than 0.7.
                               F:        First Fresnel Zone Clearance
                               K:        Ratio of effective earth radius to real earth radius

3.6.1 Obstructed Paths
Obstructed paths will be allowed where their need is clearly demonstrated, with an EIRP
increased up to a maximum of 6dB above the unobstructed path assignment level providing that
the maximum EIRP limit of 50dBW is not exceeded. For obstruction losses in excess of 6dB
operators will be expected to accept the possible lower link availability. The following conditions
will apply:
a) Where use of the higher power needed for this operation does not unnecessarily sterilise
   surrounding area and block further normal assignments.
b) The increase in EIRP will only be allowed if the obstruction cannot be overcome by increasing
   the antenna height.
c) Higher Performance antennas should be used to minimise the sterilisation of surrounding
   areas, considering the higher than normal EIRP associated with this type of operation.

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                                                    Frequency Assignment Criteria: 4GHz Band


d) The increased EIRP will only be allowed on link availabilities below or equal to 99.99%.
Detail of the assignment process modifications required to deal with operation over an obstructed
path is given in Annex D.
3.7 Path Loss
3.7.1 Median Path Loss
The median path loss between two stations will be equal to the free space basic transmission
loss. Atmospheric gaseous absorption is considered negligible in this frequency band.
             Path Loss = 92.45 + 20log(d) + 20log(f).
where:       d = distance between the stations in km.
             f = frequency of operation in GHz.
3.8 Availability

Availabilities greater than 99.99 % are to be agreed with the RA on a case-by-case basis.

NOTE:        Throughout this specification, availability will be taken to mean propagation
             availability.

3.9 Receiver Input Levels
                              Table 1: Receiver median signal levels.

                 Capacity                               Receiver Median Signal Level
             34 Mbit/s (Class 2)                               -105dBW + M2

           2 x 34 Mbit/s (Class 3)                               -99.5dBW + M2

             51Mbit/s (Class 3)                                  -103 dBW + M2

          140/155Mbit/s (Class 3)                                -97 dBW + M2

 NOTE 1:       M2 = fade margin. See clause 3.10.
 NOTE 2:       A minimum fade margin will be allowed, see clause 3.10.3.
 NOTE 3:       In the case of protected equipment an extra allowance, agreed on a case by
               case basis with the RA, may be allowed for receiver input level.
 NOTE 4:       All measurements referenced to point C on the system block diagram in the
               relevant equipment specification or UK Technical Regulation.


The RA will in general examine applications for the use of radio links on the assumption that the
median signal level of the receiver input is as detailed in Table 1 and a maximum transmitter
power shall be assigned accordingly. The levels in Table 1 are derived from the indicative link
budgets given in Annex A.
3.10 Fade margin
3.10.1 General
The two main factors considered, that cause the wanted signal to fade are clear-air fading and
rain fade. Clear-air fading is considered dominant below 10GHz and a combination of clear-air
effects and rain fade become important above 10GHz with rain fade eventually dominant at higher
frequencies. Consequently for the 4GHz band only clear-air effects are considered.
3.10.2 Clear-Air Fade Margin
The total clear-air fade margin, M2 depends on path length and terrain, service availability
required and a geoclimatic factor. The value for the fade margin (M2) is derived from ITU
Recommendation ITU-R PN.530-7 clause 2.3.


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                                                    Frequency Assignment Criteria: 4GHz Band


The methods described in the recommendation calculate the percentage of time that a specific
fade depth (A) is exceeded. In order to calculate the required fade margin for a particular
percentage of time (unavailability) an iteration process is required. This iteration process starts
using the minimum fade margin value given below and calculates the percentage of time that this
fade depth will be exceeded. If this percentage time is too large then the fade depth is increased
and the process repeats until a figure for fade depth relating to the percentage of time required is
obtained to within 0.1dB.
The process is described in more detail in Annex C.
3.10.3 Minimum Fade Margin
A minimum fade margin of 15dB will be allowed. Minimum fade margins are being reviewed within
the Radio Systems Working Group (November 1999). For up to date clarification, please contact
the Radiocommunications Agency.


3.11 Equivalent Isotropically Radiated Power calculation
The licence schedule will detail the maximum assigned EIRP for each transmitting station and the
normal EIRP where ATPC is in operation based on the following calculations:
Maximum EIRP = Rx Median signal level + Rx station feeder losses - Rx antenna gain + Path
Loss
Normal EIRP = Maximum EIRP - ATPC Range
The Rx Median signal level is the receiver minimum input level plus the fade margin. The
maximum co-polar gain figure for the receiving antenna is used.


4. Interference assessment
4.1 General
The link to be assigned is co-ordinated with all other links in the same frequency band within a co-
ordination zone radius of 250km around each site. The size of the co-ordination zone may be
reviewed from time to time as operational experience is gathered. Interference to and from the
proposed link is assessed taking into account the path profile between the two stations. Use is
made of antenna radiation patterns to obtain the gain of antennas in the direction of unwanted
signals.
The interference evaluation considers two conditions:
a) Median wanted signal against the unwanted signal enhanced by clear-air effects.
b) Faded wanted signal against median unwanted signal.
The combination producing the highest interference signal is taken.


 The procedures followed are in line with ITU-R PN. Rec. 452 and outlined in the flow diagram
shown in Annex F.


4.2 Interference Limits
The interference limits are derived as follows:
                                                               -6
       Interference limit = (Reference sensitivity for BER = 10 (See Annex A)) - W/U ratio.
4.3 Co and Adjacent channel limits
The maximum co-channel and adjacent channel interference, at the receiver input, from a single
unwanted source is shown in Tables 2 and 3. These figures are based on a minimum allowable
N/I of +6dB that translates to an interference margin of 1dB included in Annex A. W/U ratios for
single-entry interferers, relating to mixed capacity digital systems, are given by the matrices in
Annex B. The above limits are set on the basis that the wanted signal is at the reference
sensitivity input level of Table 1.

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                                                    Frequency Assignment Criteria: 4GHz Band


                        Table 2: Single entry co-channel interference limits

                Capacity          W/U (dB)                Interference limit
                (Mbit/s)                                        (dBW)

                   34                 34                        -139
                (Class 2)

                  2x34                37                       -136.5
                (Class 3)

                   51                 37                        -140
                (Class 3)

                 140/155              43                        -140
                (Class 3)



                     Table 3: Single entry adjacent channel interference limits
                Capacity          W/U (dB)                Interference limit
                (Mbit/s)                                        (dBW)

                   34                 3                         -108
                (Class 2)

                  2x34                4                        -103.5
                (Class 3)

                   51                 1                         -104
                (Class 3)

                 140/155              4                         -101
                (Class 3)



4.4 Multiple interferers
In Tables 2 and 3 and Annex B, the single-entry digital W/U ratios include allowances for multiple
interferers. The allowances are 4dB for co-channel interferers and 6 dB for adjacent channel
interferers independent of bit-rate.


5. Channel Plan
5.1 Derivation of radio frequency channels for the band 3.6 - 4.2 GHz in the UK.
An arrangement based on ITU-R Recommendation 635 with 30 MHz channel spacing provides a
total of 9 “go” and 9 “return” channels.
Let   fo (=3900 MHz) be the frequency of the centre of the band of frequencies occupied
      fn   be the centre frequency of one radio frequency channel in the lower half of the band
      f`n be the centre frequency of one radio frequency channel in the upper half of the band
The frequencies in MHz of the individual channels are expressed by the following relationships:
30MHz channel spacing:
Lower half of the band: fn = (fo - 310 +30n) MHz


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                                                     Frequency Assignment Criteria: 4GHz Band


Upper half of the band: f’n = (fo +10 +30n) MHz
where n = 1, 2, 3 ... 9.


15MHz channel spacing:
Lower half of the band: fn = (fo - 302.5 +15n) MHz
Upper half of the band: f’n =(fo +17.5 +15n) MHz
where n = 1, 2, 3 ... 18.


See Tables 4 and 5 for the actual carrier frequencies.




    5MHz                                     50MHz                               5MHz


                  9 x 30 MHz                                  9 x 30 MHz




                  18 x 15 MHz                                18 x 15 MHz




     3.6 GHz                          3.875 GHz 3.925 GHz                         4.2 GHz

             Figure 1: Channel Arrangement for the 3.6 - 4.2 GHz frequency band.




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          Table 4                        Table 5
30MHz channels      (MHz)           15MHz channels      (MHz)
n        Lower      Upper            n         Lower    Upper
1        3620       3940             1         3612.5   3932.5
2        3650       3970             2         3627.5   3947.5
3        3680       4000             3         3642.5   3962.5
4        3710       4030             4         3657.5   3977.5
5        3740       4060             5         3672.5   3992.5
6        3770       4090             6         3687.5   4007.5
7        3800       4120             7         3702.5   4022.5
8        3830       4150             8         3717.5   4037.5
9        3860       4180             9         3732.5   4052.5
                                    10         3747.5   4067.5
                                    11         3762.5   4082.5
                                    12         3777.5   4097.5
                                    13         3792.5   4112.5
                                    14         3807.5   4127.5
                                    15         3822.5   4142.5
                                    16         3837.5   4157.5
                                    17         3852.5   4172.5
                                    18         3867.5   4187.5




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                                                    Frequency Assignment Criteria: 4GHz Band
                                                                                       Annex A


  Annex A: Receiver input levels and interference levels.
      Receiver input levels and maximum permitted interference levels for digital systems
                        operating in the frequency band 3.6 to 4.2 GHz.


                                       Class 2           Class 3          Class 3         Class 3
       Channel Bandwidth:              15 MHz            15 MHz           15 MHz          30 MHz
        Minimum Bit Rate:                34                51              2 x 34         140/155
             (Mbit/s)
      Assumed modulation:              16-QAM            32-QAM          64-QAM           64-QAM

         Thermal Noise KT                     -204                 -204             -204     -204
               (dBW/Hz)
          RX Bandwidth B                      70.5                 71.4              71.7    74.2
                 (dBHz)
       Receiver Noise KTB                    -133.5              -132.6            -132.3   -129.8
                 (dBW)
       Noise Figure (Note 3)                   4.0                  4.0               4.0     4.0
                  (dB)
C/N for BER=10-6 without coding               20.5                 23.5              26.5    26.5
            gain (Note 4)
      C/N for BER=10-6 with                   17.6                 20.6              23.8    23.8
        coding gain (Note 4)
    Fixed System Losses (dB)                   6.0                  4.0               4.0     4.0
                (Note 2)
        Interference Margin                    1.0                  1.0               1.0     1.0
             (dB) (Note 5)
       Reference Sensitivity                  -105                 -103             -99.5     -97
       for BER 10-6 (dBW)
     Sensitivity for BER 10-3                 -108                 -106            -102.5    -100
                 (dBW)
      Median RX Input Level                 -105 + M           -103 + M          -99.5 + M -97 + M
           (dBW)(Note 1)
 Planned co-channel Interference              -139                 -140            -136.5    -140
             limit (dBW)
NOTE 1:         M is fade margin, dependent on path length, and availability required.
NOTE 2:         Includes Modulation/Demodulation losses, other implementation factors and branching
                network losses for single channel to points C, C'.
NOTE 3:         Referred to point C.
NOTE 4:         Reference ITU-R Recommendation F1101.
NOTE 5:         Minimum allowable N/I = 6dB




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                                             Annex A




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                                                                                                                                                    Annex B
Annex B: Wanted to unwanted levels.
Tables B1 to B8 give the Wanted to Unwanted (W/U) ratio for all frequency offsets up to three times the wanted channel spacing.
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                                                                                                                                                                                                                 Annex B
Wanted = 34 Mbps in 15 MHz Channel (16QAM)
                                                                                                                                                                                                           Table B1a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM      34
     15         2*34         64 QAM      34
     15          51          32 QAM      34
     30        140/155       64 QAM                                                                                                               34
     29           34         QPSK        34            34            34            34            33            33                          32            31                          30            28             27
     90          140        RBQPSK                                                                                                                34
     29        300 Cct      ANALOG       34            34            34            34            34            33                          23            21                          18            16             14
     29        1800 Cct     ANALOG              34            34            34            34            34                          25            22                                        17            15
  5 (P-MP)
                                                                                                                                                                                                           Table B1b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM                                         3
     15         2*34         64 QAM                                         -3
     15          51          32 QAM                                         1
     30        140/155       64 QAM                                                                                                                                                  -2
     29           34         QPSK               25            23            23            20            17            14            11                           7             6             6
     90          140        RBQPSK                                                                                                                                                   34
     29        300 Cct      ANALOG               9             4             2            -1            -3            -6            -9                          -18           -23           -26
     29        1800 Cct     ANALOG       12             6             2             0            -2            -5            -7            -11                         -20           -25
  5 (P-MP)
                                                                                                                                                                                                           Table B1c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM                                                                            -24
     15         2*34         64 QAM                                                                            -29
     15          51          32 QAM                                                                            -24
     30        140/155       64 QAM
     29           34         QPSK         5             5             4             4             3             2             2             1            -1            -4                          -10            -13
     90          140        RBQPSK
     29        300 Cct      ANALOG       -34           -40           -40           -40           -40           -40           -40           -40           -40           -40                         -40            -40
     29        1800 Cct     ANALOG              -36           -37           -38           -40           -40           -40           -40           -40           -40                         -40           -40
  5 (P-MP)
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                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B1d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM                                                                                                                -40
    15         2*34         64 QAM                                                                                                                -40
    15          51          32 QAM                                                                                                                -40
    30        140/155       64 QAM      -40
    29            34        QPSK               -14                         -16           -16           -16           -16           -17            -17             -17             -18             -18
    90           140       RBQPSK       29
    29         300 Cct     ANALOG              -40                         -40           -40           -40           -40           -40            -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40                                       -40           -40           -40           -40           -40             -40             -40             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B1e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM                                                                                                                                                        -40
    15         2*34         64 QAM                                                                                                                                                        -40
    15          51          32 QAM                                                                                                                                                        -40
    30        140/155       64 QAM                                         -40
    29            34        QPSK        -19           -20           -20           -22                         -24           -25           -26             -27             -28             -29             -30              -31
    90           140       RBQPSK                                          -1
    29         300 Cct     ANALOG       -40           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    29        1800 Cct     ANALOG              -40           -40           -40                                       -40           -40            -40             -40             -40             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B1f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM
    15         2*34         64 QAM
    15          51          32 QAM
    30        140/155       64 QAM
    29            34        QPSK               -32                         -33           -33           -34           -35                          -36             -37             -38             -39             -40
    90           140       RBQPSK                                                                             -30
    29         300 Cct     ANALOG              -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40                         -40           -40           -40           -40                                         -40             -40             -40             -40              -40
 5 (P-MP)
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 20
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = 51 Mbps in 15 MHz Channel (32QAM)
                                                                                                                                                                                                           Table B2a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM      37
     15         2*34         64 QAM      37
     15          51          32 QAM      37
     30        140/155       64 QAM                                                                                                               37
     29           34         QPSK        37            37            37            37            36            36                          35            34                          33            31             30
     90          140        RBQPSK                                                                                                                37
     29        300 Cct      ANALOG       37            37            37            37            37            36                          26            24                          21            19             17
     29        1800 Cct     ANALOG              37            37            37            37            37                          28            25                                        20            18
  5 (P-MP)
                                                                                                                                                                                                           Table B2b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM                                         6
     15         2*34         64 QAM                                         -2
     15          51          32 QAM                                         1
     30        140/155       64 QAM                                                                                                                                                  -1
     29           34         QPSK               28            26            26            23            20            17            14                          10             9             9
     90          140        RBQPSK                                                                                                                                                   37
     29        300 Cct      ANALOG              12             7             5             2             0            -3            -6                          -15           -20           -23
     29        1800 Cct     ANALOG       15             9             5             3             1            -2            -4            -8                          -17           -22
  5 (P-MP)
                                                                                                                                                                                                           Table B2c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM                                                                            -21
     15         2*34         64 QAM                                                                            -26
     15          51          32 QAM                                                                            -21
     30        140/155       64 QAM
     29           34         QPSK         8             8             7             7             6             5             5             4             2            -1                          -7             -10
     90          140        RBQPSK
     29        300 Cct      ANALOG       -31           -37           -40           -40           -40           -40           -40           -40           -40           -40                         -40            -40
     29        1800 Cct     ANALOG              -33           -34           -35           -37           -40           -40           -40           -40           -40                         -40           -40
  5 (P-MP)
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 21
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B2d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM                                                                                                                -40
    15         2*34         64 QAM                                                                                                                -40
    15          51          32 QAM                                                                                                                -40
    30        140/155       64 QAM      -40
    29           34         QPSK               -11                         -13           -13           -13           -13           -14            -14             -14             -15             -15
    90           140       RBQPSK       32
    29         300 Cct     ANALOG              -40                         -40           -40           -40           -40           -40            -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40                                       -40           -40           -40           -40           -40             -40             -40             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B2e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM                                                                                                                                                        -40
    15         2*34         64 QAM                                                                                                                                                        -40
    15          51          32 QAM                                                                                                                                                        -40
    30        140/155       64 QAM                                         -40
    29           34         QPSK        -16           -17           -17           -19                         -21           -22           -23             -24             -25             -26             -27              -28
    90           140       RBQPSK                                           2
    29         300 Cct     ANALOG       -40           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    29        1800 Cct     ANALOG              -40           -40           -40                                       -40           -40            -40             -40             -40             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B2f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM
    15         2*34         64 QAM
    15          51          32 QAM
    30        140/155       64 QAM
    29           34         QPSK               -29                         -30           -30           -31           -32                          -33             -34             -35             -36             -40
    90           140       RBQPSK                                                                             -27
    29         300 Cct     ANALOG              -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40                         -40           -40           -40           -40                                         -40             -40             -40             -40              -40
 5 (P-MP)
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 22
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = 2 * 34 Mbps in 15 MHz Channel (64QAM)
                                                                                                                                                                                                           Table B3a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM      40
     15         2*34         64 QAM      40
     15          51          32 QAM      40
     30        140/155       64 QAM                                                                                                               40
     29           34         QPSK        40            40            40            40            39            39                          38            37                          36            34             33
     90          140        RBQPSK                                                                                                                40
     29        300 Cct      ANALOG       40            40            40            40            40            39                          29            27                          24            22             20
     29        1800 Cct     ANALOG              40            40            40            40            40                          31            28                                        23            21
  5 (P-MP)
                                                                                                                                                                                                           Table B3b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM                                         10
     15         2*34         64 QAM                                         4
     15          51          32 QAM                                          7
     30        140/155       64 QAM                                                                                                                                                   7
     29           34         QPSK               31            29            29            26            23            20            17                          13            12            12
     90          140        RBQPSK                                                                                                                                                   40
     29        300 Cct      ANALOG              15            10             8             5             3             0            -3                          -12           -17           -20
     29        1800 Cct     ANALOG       18            12             8             6             4             1            -1            -5                          -14           -19
  5 (P-MP)
                                                                                                                                                                                                           Table B3c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM                                                                            -18
     15         2*34         64 QAM                                                                            -23
     15          51          32 QAM                                                                            -18
     30        140/155       64 QAM
     29           34         QPSK        11            11            10            10             9             8             8             7             5             2                          -4              -7
     90          140        RBQPSK
     29        300 Cct      ANALOG       -28           -34           -40           -40           -40           -40           -40           -40           -40           -40                         -40            -40
     29        1800 Cct     ANALOG              -30           -31           -32           -34           -40           -40           -40           -40           -40                         -40           -40
  5 (P-MP)
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 23
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B3d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM                                                                                                                -40
    15         2*34         64 QAM                                                                                                                -40
    15          51          32 QAM                                                                                                                -40
    30        140/155       64 QAM      -40
    29           34         QPSK               -8                          -10           -10           -10           -10           -11            -11             -11             -12             -12
    90           140       RBQPSK       35
    29         300 Cct     ANALOG              -40                         -40           -40           -40           -40           -40            -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40                                       -40           -40           -40           -40           -40             -40             -40             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B3e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM                                                                                                                                                        -40
    15         2*34         64 QAM                                                                                                                                                        -40
    15          51          32 QAM                                                                                                                                                        -40
    30        140/155       64 QAM                                         -40
    29           34         QPSK        -13           -14           -14           -16                         -18           -19           -20             -21             -22             -23             -24              -25
    90           140       RBQPSK                                           5
    29         300 Cct     ANALOG       -40           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    29        1800 Cct     ANALOG              -40           -40           -40                                       -40           -40            -40             -40             -40             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B3f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM
    15         2*34         64 QAM
    15          51          32 QAM
    30        140/155       64 QAM
    29           34         QPSK               -26                         -27           -27           -28           -29                          -30             -31             -32             -36             -40
    90           140       RBQPSK                                                                             -24
    29         300 Cct     ANALOG              -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40                         -40           -40           -40           -40                                         -40             -40             -40             -40              -40
 5 (P-MP)
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 24
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = 155 Mbps in 30 MHz Channel (64QAM)
                                                                                                                                                                                                           Table B4a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM                                                                                                               40
     15         2*34         64 QAM                                                                                                               40
     15          51          32 QAM                                                                                                               40
     30        140/155       64 QAM      40
     29           34         QPSK               40                          40            40            40            39            39            39
     90          140        RBQPSK       40
     29        300 Cct      ANALOG              40                          40            40            40            40            40            40
     29        1800 Cct     ANALOG                                                                                                         40            40            40            40            38             36
  5 (P-MP)
                                                                                                                                                                                                           Table B4b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM                                                                                                                                                   9
     15         2*34         64 QAM                                                                                                                                                   4
     15          51          32 QAM                                                                                                                                                   7
     30        140/155       64 QAM
     29           34         QPSK                                                                                                                                                    23            21             18
     90          140        RBQPSK
     29        300 Cct      ANALOG                                                                                                                                                    7             2              -1
     29        1800 Cct     ANALOG                            32            29                                        20            18            15            13             9             4
  5 (P-MP)
                                                                                                                                                                                                           Table B4c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM
     15         2*34         64 QAM
     15          51          32 QAM
     30        140/155       64 QAM                                                                             6
     29           34         QPSK               16            13                           8             9            10                           9             9             8             7             7
     90          140        RBQPSK                                                                             39
     29        300 Cct      ANALOG              -4            -7                          -14           -18           -21                         -28           -31           -34           -37           -40
     29        1800 Cct     ANALOG                                                                                                                                                                                -40
  5 (P-MP)
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 25
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B4d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM      -19
    15         2*34         64 QAM      -24
    15          51          32 QAM      -19
    30        140/155       64 QAM
    29           34         QPSK         6
    90           140       RBQPSK
    29         300 Cct     ANALOG       -31
    29        1800 Cct     ANALOG              -40           -40           -40           -40                         -40           -40            -40                                             -40             -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B4e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM                                         -40
    15         2*34         64 QAM                                         -40
    15          51          32 QAM                                         -40
    30        140/155       64 QAM                                                                                                                                                        -40
    29           34         QPSK                             -12           -13           -13           -13           -14                          -15             -16             -17             -18
    90           140       RBQPSK                                                                                                                                                          0
    29         300 Cct     ANALOG                            -40           -40           -40           -40           -40                          -40             -40             -40             -40
    29        1800 Cct     ANALOG       -40           -40           -40           -40
 5 (P-MP)
                                                                                                                                                                                                                    Table B4f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM
    15         2*34         64 QAM
    15          51          32 QAM
    30        140/155       64 QAM
    29           34         QPSK        -20           -21           -22           -23           -24           -24
    90           140       RBQPSK
    29         300 Cct     ANALOG       -40           -40           -40           -40           -40           -40
    29        1800 Cct     ANALOG                                                        -40           -40           -40           -40            -40                             -40             -40             -40
 5 (P-MP)
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 26
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = BT 34 Mbps in 29 MHz Channel (QPSK)
                                                                                                                                                                                                           Table B5a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM      30            30            30            30            30            30                          30            29                          29            28             27
     15         2*34         64 QAM      30            30            30            30            30            30                          30            29                          29            28             27
     15          51          32 QAM      30            30            30            30            30            30                          30            29                          29            28             27
     30        140/155       64 QAM             30                          30            30            29            29            29            29
                                                                                                                                                                                                           Table B5b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM             27            26            24            23            20            17            14                           7             3            -3
     15         2*34         64 QAM             27            26            24            23            20            17            14                           7             3            -3
     15          51          32 QAM             27            26            24            23            20            17            14                           7             3            -3
     30        140/155       64 QAM                                                                                                                                                  19            18             16
                                                                                                                                                                                                           Table B5c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM      -9            -11           -12           -13           -14           -16           -17           -18           -20           -21                         -24            -25
     15         2*34         64 QAM      -9            -11           -12           -13           -14           -16           -17           -18           -20           -21                         -24            -25
     15          51          32 QAM      -9            -11           -12           -13           -14           -16           -17           -18           -20           -21                         -24            -25
     30        140/155       64 QAM             13            10                           3            -1            -5                          -14           -17           -18           -19           -21
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 27
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B5d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM             -26                         -29           -30           -32           -33           -34            -35             -36             -38             -38
    15         2*34         64 QAM             -26                         -29           -30           -32           -33           -34            -35             -36             -38             -38
    15          51          32 QAM             -26                         -29           -30           -32           -33           -34            -35             -36             -38             -38
    30        140/155       64 QAM      -22
                                                                                                                                                                                                                    Table B5e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM      -40           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    15         2*34         64 QAM      -40           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    15          51          32 QAM      -40           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    30        140/155       64 QAM                           -37           -38           -39           -39           -40                          -40             -40             -40             -40
                                                                                                                                                                                                                    Table B5f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM             -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    15         2*34         64 QAM             -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    15          51          32 QAM             -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    30        140/155       64 QAM      -40           -40           -40           -40           -40           -40
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 28
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = BT 300 Circuit (Analog)
                                                                                                                                                                                                           Table B6a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM      30            30            30            30            30            30                          30            30                          30            30             30
     15         2*34         64 QAM      30            30            30            30            30            30                          30            30                          30            30             30
     15          51          32 QAM      30            30            30            30            30            30                          30            30                          30            30             30
     30        140/155       64 QAM             30                          30            30            30            30            30            30
                                                                                                                                                                                                           Table B6b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM             30            30            30            30            29            29            28                          27            26            25
     15         2*34         64 QAM             30            30            30            30            29            29            28                          27            26            25
     15          51          32 QAM             30            30            30            30            29            29            28                          27            26            25
     30        140/155       64 QAM                                                                                                                                                  27            26             26
                                                                                                                                                                                                           Table B6c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM      22            20            18            15            10             6            -1            -7            -13           -17                         -21            -22
     15         2*34         64 QAM      22            20            18            15            10             6            -1            -7            -13           -17                         -21            -22
     15          51          32 QAM      22            20            18            15            10             6            -1            -7            -13           -17                         -21            -22
     30        140/155       64 QAM             25            24                          23            22            21                          17            15            13            10             7
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 29
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B6d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM             -24                         -27           -28           -29           -31           -32            -34             -35             -36             -37
    15         2*34         64 QAM
    15          51          32 QAM
    30        140/155       64 QAM       3
                                                                                                                                                                                                                    Table B6e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM      -39           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    15         2*34         64 QAM      -39           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    15          51          32 QAM      -39           -40           -40           -40                         -40           -40           -40             -40             -40             -40             -40              -40
    30        140/155       64 QAM                           -40           -40           -40           -40           -40                          -40             -40             -40             -40
                                                                                                                                                                                                                    Table B6f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM             -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    15         2*34         64 QAM             -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    15          51          32 QAM             -40                         -40           -40           -40           -40                          -40             -40             -40             -40             -40
    30        140/155       64 QAM      -40           -40           -40           -40           -40           -40
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 30
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = BT 1800 Circuit (Analog)
                                                                                                                                                                                                           Table B7a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM             30            30            30            30            30                          30            30                                        30            30
     15         2*34         64 QAM             30            30            30            30            30                          30            30                                        30            30
     15          51          32 QAM             30            30            30            30            30                          30            30                                        30            30
     30        140/155       64 QAM                                                                                                        30            30            30            30            30             29
                                                                                                                                                                                                           Table B7b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM      30            30            30            30            30            29            29            28                          27            26
     15         2*34         64 QAM      30            30            30            30            30            29            29            28                          27            26
     15          51          32 QAM      30            30            30            30            30            29            29            28                          27            26
     30        140/155       64 QAM                           29            29                                        28            28            27            27            27            26
                                                                                                                                                                                                           Table B7c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM             21            19            16            13             8             3            -4            -10           -15                         -20           -22
     15         2*34         64 QAM             21            19            16            13             8             3            -4            -10           -15                         -20           -22
     15          51          32 QAM             21            19            16            13             8             3            -4            -10           -15                         -20           -22
     30        140/155       64 QAM                                                                                                                                                                                5
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 31
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B7d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM      -23                                       -27           -29           -30           -32           -33             -34             -36             -37             -38
    15         2*34         64 QAM      -23                                       -27           -29           -30           -32           -33             -34             -36             -37             -38
    15          51          32 QAM      -23                                       -27           -29           -30           -32           -33             -34             -36             -37             -38
    30        140/155       64 QAM              1            -5            -12           -19                         -28           -30            -32                                             -37             -38
                                                                                                                                                                                                                    Table B7e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM             -39           -40           -40                                       -40           -40            -40             -40             -40             -40             -40
    15         2*34         64 QAM             -39           -40           -40                                       -40           -40            -40             -40             -40             -40             -40
    15          51          32 QAM             -39           -40           -40                                       -40           -40            -40             -40             -40             -40             -40
    30        140/155       64 QAM      -39           -39           -40           -40
                                                                                                                                                                                                                    Table B7f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM      -40                         -40           -40           -40           -40                                         -40             -40             -40             -40              -40
    15         2*34         64 QAM      -40                         -40           -40           -40           -40                                         -40             -40             -40             -40              -40
    15          51          32 QAM      -40                         -40           -40           -40           -40                                         -40             -40             -40             -40              -40
    30        140/155       64 QAM                                                       -40           -40           -40           -40            -40                             -40             -40             -40
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                                                                                                                                                                            Page 32
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                 Annex B
Wanted = BT 140 Mbps in 90 MHz Channel (RBQPSK)
                                                                                                                                                                                                           Table B8a
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                 0     0.5     1     1.5     2     2.5     3     3.5     4     4.5     5     5.5     6     6.5     7     7.5     8     8.5     9     9.5    10     10.5   11     11.5     12
     15          34          16 QAM                                                                                                               30
     15         2*34         64 QAM                                                                                                               30
     15          51          32 QAM                                                                                                               30
     30        140/155       64 QAM      30
                                                                                                                                                                                                           Table B8b
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                12.5   13     13.5   14     14.5   15     15.5   16     16.5   17     17.5   18     18.5   19     19.5   20     20.5   21     21.5   22     22.5   23     23.5   24      24.5
     15          34          16 QAM                                                                                                                                                  28
     15         2*34         64 QAM                                                                                                                                                  28
     15          51          32 QAM                                                                                                                                                  28
     30        140/155       64 QAM
                                                                                                                                                                                                           Table B8c
  Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
   Channel     (Mbps) or    Modulation
 Width (MHz)   (Circuits)                25     25.5   26     26.5   27     27.5   28     28.5   29     29.5   30     30.5   31     31.5   32     32.5   33     33.5   34     34.5   35     35.5   36     36.5     37
     15          34          16 QAM
     15         2*34         64 QAM
     15          51          32 QAM
     30        140/155       64 QAM                                                                            26
                                                                                                                                                                                                                 November 1999
                                                                                                                                                                                            Page 33
                                                                                                                                                           Frequency Assignment Criteria: 4GHz Band
                                                                                                                                                                                                                         Annex B
                                                                                                                                                                                                                    Table B8d
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                37.5   38     38.5   39     39.5   40     40.5   41     41.5   42     42.5   43     43.5   44     44.5    45     45.5     46      46.5    47      47.5     48     48.5     49      49.5
    15          34          16 QAM      20
    15         2*34         64 QAM      20
    15          51          32 QAM      20
    30        140/155       64 QAM
                                                                                                                                                                                                                    Table B8e
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                50     50.5   51     51.5   52     52.5   53     53.5   54     54.5   55     55.5   56     56.5   57     57.5     58     58.5     59      59.5    60      60.5     61     61.5      62
    15          34          16 QAM                                         -22
    15         2*34         64 QAM                                         -22
    15          51          32 QAM                                         -22
    30        140/155       64 QAM                                                                                                                                                        -26
                                                                                                                                                                                                                    Table B8f
 Unwanted      Bit Rate                                                                         Wanted / Unwanted Ratio (dB) V's Frequency Offset (MHz)
  Channel     (Mbps) or    Modulation
Width (MHz)   (Circuits)                62.5   63     63.5   64     64.5   65     65.5   66     66.5   67     67.5   68     68.5   69     69.5    70     70.5     71      71.5    72      72.5     73     73.5     74      74.5
    15          34          16 QAM                                                                            -38
    15         2*34         64 QAM
    15          51          32 QAM
    30        140/155       64 QAM
                                                                                                                                          NOTE: For all offset values greater than 74.5MHz the Wanted to Unwanted ratio is -40dB
                                                                                                                                                                                                                         November 1999
                                              Page 34
             Frequency Assignment Criteria: 4GHz Band
                                             Annex B
Blank Page
                                            November 1999
                                                                                               Page 35
                                                              Frequency Assignment Criteria: 4GHz Band
                                                                                                    Annex C


Annex C: Detail on Fade Margin calculation.

1. Procedure
The calculation of the clear air fade margin is carried out along the guidelines laid out in ITU
Recommendation ITU-R P.530.7 clause 2.3. Since the calculations detailed in this recommendation
revolve around calculating percentage of time that a fade depth is exceeded an iteration process is
required. This process follows the procedure below.
Starting with a minimum fade depth (A) given in clause 3.10.3 perform the calculation given by equation
(23) of clause 2.3.2 of the recommendation. This calculation requires parameter qa which in turn requires
parameters qt and q’a. Parameter qt is derived from equation (22) and qa is derived from equation (21).
Equation (21) in turn requires parameter pw derived from the procedure of clause 2.3.1 for a fade depth, A
of 25dB. (See NOTE below).
The result from equation (23) will be the percentage of time (also labelled pw) that a fade depth A, equal to
the minimum is exceeded. If the percentage of time is too high (i.e. the fade depth is too low) then the
figure for fade depth, A is doubled (i.e. 15dB becomes 30dB) and the calculation process is repeated.
If the fade depth to be evaluated is greater than 25dB then only the method of clause 2.3.1 need be
applied (see 2.3.2 paragraph e)) in order to calculate the percentage of time. If the percentage of time
calculated is now too low (i.e. the fade depth is too high) then the calculation process is repeated for a
fade depth equal to the mean between the last two figures. This iteration process is repeated until the fade
depth figure to within 0.1dB that returns the required time percentage.
NOTE: The assignment procedure implemented covering clause 2.3.2 paragraphs a) to d) of the
recommendation calculate the fade depth for A = 25dB only. The calculation for A = 35 dB is not
implemented. Investigation of this procedure uncovered some deficiencies with this method and so the
use of 25dB only was implemented on the advice of the ITU Study Group involved. This issue will be
investigated further in future updates to recommendation 530.


2. Method for small percentages of time
This section, clause 2.3.1 is referred to by the process described above and describes a method to
calculate K the geo-climatic factor over the path concerned, the path inclination and finally the percentage
of time that a given fade depth, A is exceeded for small percentages of time.
If the link is inland then K is calculated from equation (4) where:
              pL = 5 for the UK
             CLon = 3 for Europe
             CLat is given by equations (5), (6) or (7)
             C0 = 1.7 for lower-altitude antenna in the range 0 - 400 m above mean sea level; or
             C0 = 4.2 for lower-altitude antenna in the range 400 - 700 m above mean sea level; or
             C0 = 8.0 for lower-altitude antenna more than 700 m above mean sea level.
If a fraction of the path is over the sea or coast then equations (12) and (13) are implemented to obtain K.
Path inclination is given by equation (18).
Finally the percentage of time that a fade depth is exceeded is calculated using equation (19).



3. Conversion from average worst month to average annual distributions
Clause 2.3.4 equations (30) and (31) are used for conversion from average worst month to average
annual distributions. This conversion is only required for frequencies that require iteration between the
clear air fade calculations and rain fade calculations.



                                                                                                   November 1999
                                              Page 36
             Frequency Assignment Criteria: 4GHz Band
                                             Annex C




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                                            November 1999
                                                                                                  Page 37
                                                                 Frequency Assignment Criteria: 4GHz Band
                                                                                                   Annex D


Annex D: Assignments over an obstructed path.



Assignments over an obstructed path will be allowed with an increased EIRP up to a maximum of 6dB
over the value that would be assigned for a normal assignment having assumed a path clearance of
0.577F, where F is the first fresnel zone radius.


To assess the required increase in EIRP carry out the following procedure:


Calculate the first fresnel zone radius, F at the obstructed point in the path:



                                                            d 1( km) * d 2 ( km)
                                      F( metres ) = 548 *
                                                            f ( MHz ) * d ( km)


Where d is the overall path length and d1 and d2 are the distances from each end of the link to the
obstruction point.


Calculate the extra attenuation due to the obstruction to be added to the path loss from the expression:
(Radians assumed)

                                      A( dB ) = −20 log 2 * sin((nπ ) / 2)


         n = ( F1 / F ) and F1 is the path clearance between the direct ray and the obstruction.
                      2
Where:




                                                                                                   November 1999
                                          Page 38
         Frequency Assignment Criteria: 4GHz Band
                                         Annex D




Blank Page




                                        November 1999
                                                                                              Page 39
                                                             Frequency Assignment Criteria: 4GHz Band
                                                                                                    Annex E


Annex E: Assigning Passive Repeater Stations



Consider a link from A to D comprising two hops A to B and C to D where B and C are a co-located
passive repeater station.


Back to Back Antenna Type


It is necessary to calculate the EIRP from the central repeater station and determine the required input
level to the repeater station. This involves both standard and non standard assignments in the following
manner:
1) Enter the data for all sites and make the feeder loss at both B and C equal to the loss between the two
antennas.
2) Perform a standard assignment for the link A to B. From the EIRP and antenna gain at B calculate the
required receive level at C. Ignore the direction A to B.
3) Carry out a non-standard assignment from C to D using the calculated receive level from 2) at station
C.
4) From the EIRP and antenna gain at C calculate the required receive level at B.
5) Repeat the assignment from A to B using the receive level calculated in 4) at station B.


Step 3) provides the final EIRP at station D and step 5) provides the final EIRP at station A.
It may be useful in some frequency bands to change polarisation at the repeater station.
Plane Reflector
The procedure for these types of passive repeater is the same as points 2) to 5) above except that B is
the same point as C and the gain of the reflector needs to be calculated from the following expression:



                    (
Grep = 20 log 139.5 * f 2 * a * cos(angle / 2)                   )
Where:       f = frequency in GHz
             a = area of the reflector
             angle = the angle at the reflection point in degrees.
The antenna gain for point B should be half the value Grep for each hop A to B(C) and C (B) to D.
Interference at the reflector only needs to be considered if it arrives from the same direction as the wanted
signal.




                                                                                                   November 1999
                                              Page 40
             Frequency Assignment Criteria: 4GHz Band
                                             Annex E




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                                            November 1999
                                                                                                 Page 41
                                                                Frequency Assignment Criteria: 4GHz Band



Annex F: High-level flow diagram for Recommendation ITU-R P.452



Note: the following diagram is based on P.452-7 (1995 P Series Fascicle), but there are
no differences between recent versions in the high-level structure of the method.


                                            INPUTS:
         Path profile and latitude
         Frequency
         Radio-meteorological parameters (N0 and ∆N)
         Antenna gains in direction of unwanted signal path



                           Yes            Path is          No
                                       line of sight
                                             ?


                         Yes
     Fresnel zone
     is obstructed
           ?

      No
 LINE OF SIGHT          LINE OF SIGHT
                                                                   TRANSHORIZON:
 WITH FRESNEL          WITH SUB-PATH
                                                       Select one or more models according to:
  CLEARANCE:            OBSTRUCTION:
                                                   Path < 200 km         Always      Path > 20 km

 Free-space;            Free-space;              Diffraction:         Troposcatter   Anomalous:
 Gaseous losses;        Gaseous losses;                               model:
                                                 Free-space;                         Time-
 Clear-air              Clear-air;                                    Gaseous.       variable;
                                                 Gaseous;
                        Diffraction.                                                 Fixed losses;
                                                 Enhancements;
                                                                                     Gaseous.
                                                 Diffraction.




                                        OUTPUT
      Basic transmission loss not exceeded for the input annual percentage time.




                                                                                                     November 1999
                                                                                   Page 42
                                                  Frequency Assignment Criteria: 4GHz Band


Document History
         Version                         Date                    Comments
 Publication 353p 0001 00         November 1999                  First Issue.




Document Information:

Title:   Frequency Assignment Criteria
Technical Editor:       Brian Harrison
Working Filename:       353p 0001 00




                                                                                 November 1999

								
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