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22 06 0005 05 0000 ETRI FT I2R Motorola Philips Samsung Thomson Proposal (PowerPoint)

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22 06 0005 05 0000 ETRI FT I2R Motorola Philips Samsung Thomson Proposal (PowerPoint) Powered By Docstoc
					March 2006                                                                                                                doc.: IEEE 802.22-06/0005r5
          A PHY/MAC Proposal for IEEE 802.22
                  WRAN Systems
                         IEEE P802.22 Wireless RANs                                                                      Date: 2006-03-08
Authors:
Name                                 Company                                                Address              Phone                            Email
John Benko                           France Telecom (FT)                                    USA                                                   John.Benko@francetelecom.com
Yoon Chae Cheong                     SAIT                                                   Korea                +82-31-280-9501                  Yc.cheong@samsung.com
Carlos Cordeiro                      Philips                                                USA                  +1-914-945-6091                  Carlos.Cordeiro@philips.com
Wen Gao                              Thomson Inc.                                           USA                  +1-609-987-7308                  wen.gao@thomson.net
Chang-Joo Kim                        ETRI                                                   Korea                +82-42-860-1230                  cjkim@etri.re.kr

Hak-Sun Kim                          Samsung Electro-mechanics                              Korea                +82-31-210-3500                  hszic.kim@samsung.com

Stephen Kuffner                      Motorola                                               USA                   +1-847-538-4158                 stephen.kuffner@motorola.com

Joy Laskar                           Georgia Institute of Technology                        USA                  +1-404-894-5268                  joy.laskar@ece.gatech.edu
Ying-Chang Liang                     Institute for Infocomm Research                        Singapore            +65-68748225                     ycliang@i2r.a-star.edu.sg
Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in
this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE
Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit
others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22.
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the
statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to
patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard
is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair
Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being
developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org.
>
Submission                                                                                 Slide 1              ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                        doc.: IEEE 802.22-06/0005r5
Co-Authors
        Name              Company           Address           Phone                          email
   Myung-Sun Song           ETRI            Korea        +82-42-860-5046               mssong@etri.re.kr
     Soon-Ik Jeon           ETRI            Korea        +82-42-860-5947               sijeon@etri.re.kr
   Gwang-Zeen Ko            ETRI            Korea        +82-42-860-4862               gogogo@etri.re.kr
  Sung-Hyun Hwang           ETRI            Korea        +82-42-860-1133               shwang@etri.re.kr
    Bub-Joo Kang            ETRI            Korea        +82-42-860-5446              kbj64370@etri.re.kr
   Chung Gu Kang            ETRI            Korea        +82-2-3290-3236             ccgkang@korea.ac.kr
   KyungHi Chang            ETRI            Korea        +82-32-860-8422              khchang@inha.ac.kr
     Yun Hee Kim            ETRI            Korea        +82-31-201-3793              yheekim@khu.ac.kr
     Moon Ho Lee            ETRI            Korea        +82-63-270-2463            moonho@chonbuk.ac.kr
   HyungRae Park            ETRI            Korea        +82-2-300-0143          hrpark@mail.hangkong.ac.kr

    Martial Bellec    France Telecom        France       +33 2 99 12 48 06     Martial.Bellec@francetelecom.com

   Denis Callonnec    France Telecom        France       +33-4-76-764412      Denis.Callonnec@francetelecom.com

     Luis Escobar     France Telecom        France       +33-2-45-294622       Luis.Escobar@francetelecom.com

    Francois Marx     France Telecom        France       +33-4-76-764109      Francois.Marx@francetelecom.com

     Patrick Pirat    France Telecom        France       +33-2-99-124806         Ppirat.ext@francetelecom.com
                     Georgia Institute of
     Kyutae Lim                              USA         +1-404-385-6008             ktlim @ece.gatech.edu
                           Technology
                     Georgia Institute of
    Youngsik Hur                             USA         +1-404-385-6008             yshur @ece.gatech.edu
                           Technology
Submission                                     Slide 2      ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                doc.: IEEE 802.22-06/0005r5
Co-Authors
         Name          Company    Address             Phone                          Email
    Wing Seng Leon       I2R      Singapore       +65-68748225              wsleon@i2r.a-star.edu.sg
     Yonghong Zeng       I2R      Singapore       +65-68748225              yhzeng@i2r.a-star.edu.sg
     Changlong Xu        I2R      Singapore       +65-68748225               clxu@i2r.a-star.edu.sg
  Ashok Kumar Marath     I2R      Singapore       +65-68748225              ashok@i2r.a-star.edu.sg
    Anh Tuan Hoang       I2R      Singapore       +65-68748225             athoang@i2r.a-star.edu.sg
     Francois Chin       I2R      Singapore       +65-68748225           chinfrancois@i2r.a-star.edu.sg
     Zhongding Lei       I2R      Singapore       +65-68748225               leizd@i2r.a-star.edu.sg
    Peng-Yong Kong       I2R      Singapore       +65-68748225             kongpy@i2r.a-star.edu.sg
     Chee Wei Ang        I2R      Singapore       +65-68748225              angcw@i2r.a-star.edu.sg
   Yufei Blankenship   Motorola     USA          +1-847-576-1902       Yufei.Blankenship@motorola.com

     Brian Classon     Motorola     USA          +1-847-576-5675         Brian.Classon@motorola.com

       Fred Vook       Motorola     USA          +1-847-576-7939           Fred.Vook@motorola.com

      Jeff Zhuang      Motorola     USA          +1-847-538-5924          Jeff.Zhuang@motorola.com

      Kevin Baum       Motorola     USA          +1-847-576-1619          Kevin.Baum@motorola.com

      Tim Thomas       Motorola     USA          +1-847-538-2586           T.Thomas@motorola.com

   David Grandblaise   Motorola    France        +33 1 69 35 25 82     David.Grandblaise@motorola.com




Submission                             Slide 3      ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                        doc.: IEEE 802.22-06/0005r5

Co-Authors
         Name              Company           Address           Phone                          email
   Dagnachew Birru          Philips           USA         +1-914-945-6401        Dagnachew.Birru@philips.com
   Kiran Challapali         Philips           USA         +1-914-945-6357        Kiran.Challapali@philips.com
   Vasanth Gaddam           Philips           USA         +1-914-945-6424        Vasanth.Gaddam@philips.com
    Monisha Ghosh           Philips           USA         +1-914-945-6415         Monisha.Ghosh@philips.com
    Gene Turkenich          Philips           USA         +1-914-945-6370         Gene.Turkenich@philips.com
   Duckdong Hwang            SAIT            Korea         +82 31 280 9513      duckdong.hwang@samsung.com
     Chung Jaehak            SAIT            Korea        +82-32-860-8421              jchung@inha.ac.kr
    Kim Jaemyeong            SAIT            Korea        +82-32-860-8420              jaekim@inha.ac.kr
 Ashish Pandharipande        SAIT            Korea        +82 010-6335-7784             pashish@ieee.org
      Yoo Sangjo             SAIT            Korea        +82-32-860-8304               sjyoo@inha.ac.kr
                        Samsung Electro-
     Jeong Suk Lee                           Korea        +82-31-210-3217           js0305.lee@samsung.com
                             Mechanics
                        Samsung Electro-
     Chang Ho Lee                            Korea        +82-31-210-3217          changholee@samsung.com
                             Mechanics
                        Samsung Electro-
   Wangmyong Woo                             Korea        +82-31-210-3217            wmwoo@samsung.com
                             Mechanics
                           Samsung
                                                                                   d.mazzarese@samsung.com
   David Mazzarese         Electronics Co.   Korea        +82 10 3279 5210
                                Ltd.

Submission                                      Slide 4     ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                 doc.: IEEE 802.22-06/0005r5

Co-Authors
         Name           Company        Address          Phone                          email
                     Samsung Telecom
       Baowei Ji                        USA         +1-972-761-7167          Baowei.ji@samsung.com
                           America
   Max Muterspaugh    Thomson Inc.      USA         +1-317-587-3711      Max.muterspaugh@thomson.net
       Hang Liu       Thomson Inc.      USA         +1-609-987-7335           hang.liu@thomson.net
     Paul Knutson     Thomson Inc.      USA         +1-609-987-7314         paul.knutson@thomson.net
      Josh Koslov     Thomson Inc.      USA         +1-609-987-7337          josh.koslov@thomson.net




Submission                                Slide 5    ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                doc.: IEEE 802.22-06/0005r5


                 Presentation Outline

 • PHY Proposal

 • Updates to the MAC Proposal

 • Conclusions




Submission                Slide 6   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                doc.: IEEE 802.22-06/0005r5


                 Presentation Outline

 • PHY Proposal

 • Updates to the MAC Proposal

 • Conclusions




Submission                Slide 7   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                   doc.: IEEE 802.22-06/0005r5


                       Disclaimer

 • The following set of slides represent the joint ETRI-
   France Telecom-I2R-Motorola-Philips-Samsung-
   Thomson PHY proposal

 • This is in contrast to the MAC presentation, which is
   confined to describe only the updates




Submission                   Slide 8   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                  doc.: IEEE 802.22-06/0005r5


                      PHY Outline
 • Overview/ Channel bonding

 • Fractional Bandwidth

 • Sub-Channelization, pilot insertion

 • Error Correction Coding

 • Multiple antenna

 • Sensing


Submission                  Slide 9   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
    March 2006                               doc.: IEEE 802.22-06/0005r5


                    PHY Overview

• OFDMA both in uplink and downlink
• QPSK, 16-QAM, and 64-QAM, transformed-QPSK
• More than 30 sub channels per TV channel
• Contiguous channel bonding upto 3 TV channels (and
  beyond in a stack manner)
• Data rate range from 5Mbps to 70Mbps
• TDD, FDD

                                                                 Modulation
       Randomizer   FEC               Interleaver               (constellation
                                                                  mapping)


    Submission             Slide 10    ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                       doc.: IEEE 802.22-06/0005r5


               What We Have Proposed ….

      Adaptive            Known and proven technology
      OFDMA               for broadband fixed/mobile wireless access
                          (e.g., IEEE 802.16d/e – WiBro in Korea)
         •     Adaptively scalable to spectrum availability
         •     Channel Bonding
         •     New frame structure for CR-enabled operation
         •     Enhanced PHY features
             - Adaptive sub-carrier allocation
             - Adaptive pilot insertion
             - Enhanced channel coding (LDPC, Turbo Code, SBTC)
             - Multiple antenna options
Submission                      Slide 11   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                             doc.: IEEE 802.22-06/0005r5

  Advantages of Adaptive OFDMA Proposal

 • Flexible Bandwidth Allocation
       – To use the partial bandwidth (1, 2, 3, 4, 5, 6, 7, 8 MHz) adaptively,
         depending on the channel state information (availability)
       – To fully utilize available bandwidth under a unified PHY framework


 • Single Sampling Frequency
       – Sampling frequency is the same for all FFT modes.


 • Constant Subcarrier Spacing
       – The subcarrier spacing is constant for all different channel
         bandwidths  Robust to the frequency offset

Submission                            Slide 12   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
       March 2006                                                                          doc.: IEEE 802.22-06/0005r5

                      PHY (Baseband) Architecture


                                                   Preamble                                                                            Binary
                                                                                                  Puncturer
                               Guard                   &        Subcarrier                                                              Data
                    P/S                     IFFT                               S/P     Mapper         &        Encoder   Randomizer
                             Insertion               Pilot       Allocator
                                                                                                 Interleaver
                                                   Insertion



          Channel




AWGN


                                                                                                    De-                               Recovered
                              Guard                 Channel     Subcarrier              De-     interleaver                  De-        Data
                    S/P                     FFT                                P/S                             Decoder
                             Removal               Estimation   Deallocator            mapper        &                   randomizer
                                                                                                Depuncturer




                          Synchronization




       Submission                                                   Slide 13         ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
  March 2006                                                           doc.: IEEE 802.22-06/0005r5

                      System Parameters: Proposed
    Parameters                            Specification                                      Remark

Frequency range        54~862 MHz
Service coverage       Typical range 33 km,
                       • Mandatory: 6, 7, 8 MHz with channel bonding           Allows the fractional use of TV
Bandwidth                                                                      channel and channel bonding up
                       • Optional: fraction BW                                 to 3 TV channels
                       • Maximum: 70 Mbps                                      Maximum of 23 Mbps for 6 MHz
Data rate
                       • Minimum: 4.5 Mbps
                       • Maximum: 3.94 bits/s/Hz
Spectral Efficiency                                                            Single TV channel BW of 6 MHz
                       • Minimum: 0.75 bits/s/Hz
Modulation             QPSK, 16QAM, 64QAM
Transmit power         Default 4W EIRP
Multiple Access        Adaptive OFDMA                                          Partial bandwidth allocation
FFT Mode               1024, 2048, 4096, 6144
Cyclic Prefix Mode     1/4, 1/8, 1/16, 1/32
Duplex                 TDD or FDD
Network topology       Point-to-Multipoint Network



  Submission                                         Slide 14   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                    doc.: IEEE 802.22-06/0005r5


                 Channel Bonding: Motivation

 • Spectrum occupancy measurements conducted by Shared
   Spectrum Company from January/2004 to August/2005 have
   shown that:
             • “There is a significant amount of spectrum available in continuous blocks that
               are 1 MHz and wider ”
             • “A dynamic spectrum sharing radio with a low agility, contiguous waveform
               will provide high utility”

 • The November 18, 2005, study from Freepress and New America
   Foundation (entitled “Measuring the TV “White Space” Available
   for Unlicensed Use”) reveals that there exists a considerable
   amount of contiguous vacant TV channels (especially in the upper
   UHF band)

 • More can be expected in other countries
Submission                                   Slide 15   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                         doc.: IEEE 802.22-06/0005r5


         Contiguous open spectrum available!
      Example: Jackson, Mississippi




Source: “Measuring the TV „White Space‟ Available for Unlicensed
  Wireless Broadband”, Nov 18, 2005, New America Foundation
Submission                        Slide 16   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                     doc.: IEEE 802.22-06/0005r5


                              Channel Bonding
 • Make opportunistic and simultaneous use of multiple contiguous
   TV channels

 • Benefits:
       – More data rate or range
             • Initial link-budget analysis showed that single-TV channel can not support full
               data rate (e.g., 18Mbps) upto 30 Km range


       – Multi-path Diversity
             • Small BW signal can have deep fade or flat fade
             • Wider-bandwidth signal provides more frequency/multipath diversity


       – Interference
             • Wider-band reduces the amount of interference
Submission                                    Slide 17   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                               doc.: IEEE 802.22-06/0005r5


                Channel Bonding: Capacity

 • Aggregate TV channels to get more capacity
       – Shannon: C = B.log2(1+S/N)
       – capacity proportional to BW, but logarithmic with SNR or signal
         power

 • If S/N is fixed, then capacity increases linearly with
   bandwidth

 • If signal power is fixed, but bandwidth is increased
       – C = B.log2(1+S/(BNo))
       – Capacity still increases as bandwidth is increased


Submission                              Slide 18   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                            doc.: IEEE 802.22-06/0005r5
  Capacity of aggregated channels as a given
  signal power is spread over more channels




Submission           Slide 19   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
    March 2006                                                     doc.: IEEE 802.22-06/0005r5


                   Preliminary Link Budget (LOS)
modulation                  QPSK      64-QAM        16-QAM
coding rate                     1/2        2/3           1/2
Throughput/channel                5         19            29     Mb/s
center frequency                0.7        0.7           0.7     GHz
bandwidth                         6          6            18     MHz
Distance                      30000       6000         30000     m                     • Difficult to
Tx power                          4          4             4     W
Tx averg power                 36.0       36.0          36.0     dBm                   achieve 19Mbps
TX antenna gain                 0.0        0.0           0.0     dBi                   over 30Km
Rx power
free space path loss            119         105            119   dB
Rx antenna gain                  12          12             12   dBi
cable and other losses            3           3              3   dB
Total received avrg power       -74         -60            -74   dBm                   • channel bonding
Receiver noise figure             4           4              4   dB
Noise power                    -106        -106           -101   dBm
                                                                                       needed to achieve
Interference allowance            3           3              3   dB                    long range
Received SNR                     25          39             21   dB
Required SNR                      4          25             10   dB
Implementation/OFDM loss        6.0         6.0            6.0   dB
Link Margin                    15.4         8.3            4.6   dB




    Submission                                 Slide 20     ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                       doc.: IEEE 802.22-06/0005r5


                  Channel Bonding Scheme
 • 6, 12, 18 MHz channels

 • Constant inter-carrier                                  TV
                                                                                      TV


   spacing                                                              WRAN
                                                  N-3      N-2    N-1    N      N+1   N+2   N+3   N+4




 • Depends on availability
                                                           TV
                                                                                             TV




 • Several receiver techniques to                 N-3      N-2    N-1    N
                                                                             WRAN
                                                                                N+1   N+2   N+3   N+4

   deal with flexible BW
       – Selectable analog filters
                                                  TV

       – Up sampling digital filters
                                                                                             TV



                                                                        WAN
                                                  N-3      N-2    N-1    N      N+1   N+2   N+3   N+4




Submission                             Slide 21         ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                  doc.: IEEE 802.22-06/0005r5


                  Channel bonding structure
 • 6K FFT over 3 TV channels                      • Fixed inter-carrier spacing
       – 2K per TV channel                            – Several implementation
       – Null out the outer carriers for 1              possibilities
         or 2 TV channels

                                                                                               Data
                                             DC
                                                                                             Sub-carrier
                                           MHz
                                         6 6 MHz
                                                                                               Pilot
                                                                                             Sub-carrier

                                             DC
                                                                                             Guard/Null
                                                                                             Sub-carrier
                                         12 MHz
                                          12 MHz




                                             DC

                                         18 MHz
                                          18 MHz


Submission                               Slide 22     ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                              doc.: IEEE 802.22-06/0005r5

                 FFT Mode for WRAN Systems

                        No. of Bonded Channel
                                                    1            2           3
             Basic FFT Mode


                              1K                   1K           2K          NA


                              2K                   2K           4K          6K


                              4K                   4K          NA           NA


                              6K                   6K          NA           NA




Submission                             Slide 23   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                                                                 doc.: IEEE 802.22-06/0005r5


                                           Superframe Structure
                                                                                                                                        Time
   ...                 Superframe n-1                      Superframe n                              Superframe n+1               ...




         Preamble    SCH                 frame 0                           frame 1                   ...              frame m




                                                                            Occupied by Incumbent


                                                                                                    Occupied by Incumbent


               TV Channel
                          Preamble SCH
                   t-1
   Frequency




                                                                 Frame
               TV Channel                  Frame   Frame                      Frame
                          Preamble SCH                     ...    m-2                               Preamble SCH
                   t                         0       1                         m-1
                                                                 (Quiet)                 Frame
                                                                                                                   ... Frame    Frame          Frame
                                                                                           m                            0         1              n
               TV Channel
                          Preamble SCH                                                              Preamble SCH
                   t+1




                                                                            Occupied by Incumbent




                                                                                                                                               Time
Submission                                                                 Slide 24          ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
  March 2006                                                        doc.: IEEE 802.22-06/0005r5


                                       Preamble
   • Superframe preamble
         –     Over 1512 sub-carriers (every fourth or second non-zero),
         –     5 MHz BW
         –     Simply duplicate for additional TV channels
         –     1 MHz gap between adjacent channels to relax filtering
         –     2 symbol duration (1 more for data)
   • Frame preamble: 1-3 TV channels
         – 1728*N sub-carriers
         – Short preamble is optional

Example structure
 ST1           ST2    ST3      ST4      ST5              GI                 LT1                       LT2


                             (short)                                                      (long)
  Submission          TSYM                    Slide 25
                                                                                  TSYM
                                                              ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                  doc.: IEEE 802.22-06/0005r5

                       Preamble
 • Preamble has the repetition pattern in the time domain:
    – Time synchronization
    – Frequency synchronization
    – Channel estimation
    – Cell ID detection



 • Preamble is modulated using BPSK modulation.




Submission                 Slide 26   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                   doc.: IEEE 802.22-06/0005r5


               Transformed QPSK/OFDMA
 • Spread data over some sub-
   carriers (QPSK only)
       – Hadamard
       – Two-carrier
       – FFT based unitary pre-coding
       – Frequency offset DFT
 •    Depending on the receiver                                  Time (in OFDM symbol unit)

      structure, this can
       – Increase capturing of multipath           1        dev 1
                                                                              Dev2 (16QAM)
          diversity                subchannels     2      (64QAM)                                   Dev8
       – Increase resiliency                       3                                              (64QAM)
                                                          dev3        Dev4 (S-QPSK)
                                                   4
          to interferers
                                                             dev5 (16QAM)
 •    Receiver structures
                                                                                          Dev7 (S-QPSK)
       – MMSE                                                dev6 (64QAM)
       – Approximate ML

Submission                              Slide 27       ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
  March 2006                                                            doc.: IEEE 802.22-06/0005r5

        OFDMA Parameters/Single Channel (6MHz)
              Mode                    1K                     2K                    4K                     6K

         FFT Size                    1024                2048                     4096                  6144
        Bandwidth
                                                                      k MHz
      (k = 1, 2, …, 6)
     Sampling Factor                                                    8/7
   No. of Used Subcarriers
                                    140 * k             280 * k                  560 * k               840 * k
(including pilot, but not DC)
   Sampling Frequency                                               48/7 MHz
    Subcarrier Spacing           6.696 kHz(***)       3.348 kHz                1.674 kHz              1.116 kHz
   Occupied Bandwidth           6.696 kHz*140*k   3.348 kHz*280*k          1.674 kHz*560*k        1.116 kHz*840*k
  Bandwidth Efficiency(*)                                            93~94 %
         FFT Time                  149.33 us           298.66 us                597.33 us               896 us
   Cyclic Prefix Time(**)          37.33 us            74.66 us                 149.33 us               224 us
  OFDMA Symbol Time                186.66 us           373.33 us                746.66 us              1120 us

 (*) Bandwidth Efficiency = Subcarrier Spacing * (Number of Used Subcarriers + 1)/BW
 (**) It is assumed that cyclic prefix mode is 1/4.
 (***) Italics indicate an approximated value.
 Submission                                       Slide 28        ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
   March 2006                                                                  doc.: IEEE 802.22-06/0005r5


         OFDMA parameters – channel bonding
                                         3 TV bands                       2 TV bands                      1 TV bands
        Parameter
                                 18         21         24           12         14          16       6          7          8
   Inter-carrier spacing,
                                3348       3906       4464         3348       3906      4464      3348       3906      4464
          DF (Hz)
   FFT period, TFFT (ms)        298.66     256.00     224.00   298.66        256.00    224.00    298.66     256.00     224.00
 Total no. of sub-carriers,
                                           6144                               4096                           2048
            NFFT
No. of guard sub-carriers,
                                   1104 (552,1,551)                      736 (368,1,367)                368 (184,1,183)
      NG (L, DC, R)
 No. of used sub-carriers,
                                           5040                               3360                           1680
       NT = ND + NP
No. of data sub-carriers, ND               4680                               3120                           1560

No. of pilot sub-carriers, NP               360                               240                            120

Occupied bandwidth (MHz)        16.884     19.698     22.512   11.256        13.132    15.008     5.628     6.566      7.504

Bandwidth Efficiency (%)                                                      93.8

   Submission                                           Slide 31         ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                        doc.: IEEE 802.22-06/0005r5


                                        Data Rate
 •     Bandwidth = 6 MHz
 •     FFT size = 2048
 •     Cyclic prefix mode = 1/4
 •     No pilot, no quiet periods assumed

                                                                                               Unit: Mbps
                  Code Rate
                                     7/8            5/6            3/4             2/3             1/2
     Modulation
             64QAM                  23.63          22.50         20.25            18.00           13.50

             16QAM                  15.75          15.00         13.50            12.00            9.00

             QPSK                   7.88           7.50           6.75             6.00            4.50

  Data Rate = No. of used subcarriers * code rate * no. of bits per modulation symbol/OFDM symbol time




Submission                                       Slide 32   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                        doc.: IEEE 802.22-06/0005r5


                  Data Rate – Channel Bonding
 •     Bandwidth = 3*6 MHz
 •     FFT size = 2048
 •     Cyclic prefix mode = 1/4
 •     No pilot, no quiet periods assumed

                                                                                               Unit: Mbps
                  Code Rate
                                     7/8            5/6            3/4             2/3             1/2
     Modulation
             64QAM                  70.89          67.50         60.75            54.00           40.50

             16QAM                  47.25          45.00         40.50            36.00           27.00

             QPSK                   23.64          22.50         20.25            18.00           13.50

  Data Rate = No. of used subcarriers * code rate * no. of bits per modulation symbol/OFDM symbol time
            * no. of channel bonded


Submission                                       Slide 33   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                       doc.: IEEE 802.22-06/0005r5

                             Spectral Efficiency
•    Single channel bandwidth = 6 MHz
•    FFT size = 2048
•    Cyclic prefix mode = 1/4
•    No pilot, no quiet periods assumed
•    The spectral efficiency is same for all fractional BW mode
                                                                                            Unit : bps/Hz
                 Code Rate
                                    7/8           5/6            3/4             2/3             1/2
    Modulation
             64QAM                 3.94           3.75          3.38             3.00            2.25

             16QAM                 2.63           2.50          2.25             2.00            1.50
             QPSK                  1.31           1.25          1.13             1.00            0.75
Spectral Efficiency = No. of used subcarrier*code rate*no. of bits per modulation symbol/OFDM symbol time/BW



Submission                                      Slide 34   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                                  doc.: IEEE 802.22-06/0005r5

         Minimum Peak Throughput per CPE
•    Bandwidth = 6 MHz
•    FFT size = 2048
•    Cyclic prefix mode = 1/4
•    No. of CPE‟s = 512 CPE‟s/oversubscription ratio 50 ~ 11 CPE‟s
•    No pilot, no quiet periods assumed
                                                                                                        Unit : Mbps
                  Code Rate
                                         7/8              5/6              3/4              2/3             1/2
    Modulation
             64QAM                      2.15             2.05             1.84             1.64             1.23

             16QAM                      1.43             1.36             1.23             1.09             0.82

             QPSK                       0.72             0.68             0.61             0.55             0.41
Min. Peak Throughput = No. of used subcarriers*code rate*no. of bits per modulation symbol/OFDM symbol time/no. of CPE’s



Submission                                              Slide 35     ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                            doc.: IEEE 802.22-06/0005r5




             Fractional BW Usage




Submission           Slide 36   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                     doc.: IEEE 802.22-06/0005r5

                 Fractional Bandwidth Usage
   • If wireless microphones are in operation in TV channel, the
     WRAN systems may be clear the entire TV channel
   • The number of used sub-carriers is proportional to the
     fractional bandwidth
   • The fractional BW mode is identified by using a Preamble
   • Example:
                                  Incumbent or other CR user
             TV channel            (except microphone user)                Microphone user




                                                                                                  f

             6 MHz        6 MHz                          Unused(6 MHz)
                                        Fractional use
                                        of TV channel

Submission                                   Slide 37    ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
          March 2006                                                                         doc.: IEEE 802.22-06/0005r5

                                              Fractional Bandwidth Mode
                   • Total Number of Fractional BW Mode To Detect : 36
                                                                                   Start position of fractional BW mode


                                  Null                                                  1 2 3 4 5 6 7 8
                                                        1
                                                        2                          1
                     Fractional BW of 1 MHz




                                                        3                          2

                                                                   Fractional BW
                                                        4                                  Fractional BW
Real BW of 8 MHz




                                                                                   3
                                                        5                                    mode zone
                                                                                   4
                                                        6
                                                        7                          5
                                                        8                          6
                                 Null                                              7                       Not applicable

                                                    Start position                 8
                                               of fractional BW mode
         Submission                                                    Slide 38        ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
  March 2006                                                                 doc.: IEEE 802.22-06/0005r5

Preamble Sequence for Fractional BW Usage (2K FFT)
 Index   Fractional BW   Start Position                                 PN Sequence (1680 bits)
                                          0x251D994101EDA04D8BD0B8EA6FA20AE590C2CC199AB083C6AE61F091F2DD41D989EC164B1481D611BE9CE
                                          A0094AFE9DB56A4763F55B26E54EAB73ACD7D4BBA64C1421BC3EB9D67113A5FB9C529AADC9CAB1FB882905
   0           1               0          601778659CDB69AFCBADDF8B42314A7985B5F87C20692309D350454FF9326481683FADAE4711DD0CC5DACEDF
                                          7CD5DF1177D60EBA4DBE657F19F08189EFC6B5DE6C2CFDCD13195DE077586B8EE01E00B6468B10A53FAAC1D
                                          D846E2A01681980D444B6AD0D34C34EC9CFD9341507878EC9FBAE498F5A20614BDF3E4B22D

   1           1               1

   2           1               2

   3           1               3

   4           1               4

   5           1               5

   6           1               6

   7           1               7
                                                         This sequence will be
   8

   9
               2

               2
                               0

                               1
                                                        determined to minimize
  10           2               2                               the PAPR
  11           2               3

  12           2               4

  13           2               5

  14           2               6

  …            …               …                                                     …

  33           7               1

  34           7               2

  35           8               1



  Submission                                           Slide 39       ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                         doc.: IEEE 802.22-06/0005r5

  Flow Diagram of Fractional BW Mode Detection


         CPE Power On               Fractional BW Mode
                                          Detection
                                      Using Preamble
      Signal Detection &                                                        Fractional BW
    Automatic Gain Control                                                       Usage Mode
                                   Decoding Superframe
                                   Control Header (SCH)
                                                                                   Channel
     Superframe Preamble                                                           Bonding
    Start Position Detection                                                     Information
                                          Decoding Frame

       Synchronization &
       Channel Estimation




Submission                     Slide 40      ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                         doc.: IEEE 802.22-06/0005r5

        Simple Mode Detection Procedure (1)

                              Search
                        the Fractional BW
               CPE         Usage Mode
             Power On    (Correlation with
                           All Preamble
                            Sequence)
                                              NO                CorrelationOut>TH
                                              YES                        ?


                             Confirm
                        the Fractional BW
                           Usage Mode
                         (Correlation with
                        Previous Preamble
                            Sequence)


Submission                      Slide 41     ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                      doc.: IEEE 802.22-06/0005r5

        Simple Mode Detection Procedure (2)
 • Example:
  Transmitted
 SuperPreamble   0 0 … 0 17 17 … 17 31 31 … 31 25 25 …
     Index

                                       Fractional mode changed

   Correlated
 SuperPreamble   All 0 … 0 0 17 … 17 17 31 … 31 31 25 …
     Index

                          The Correlation Out is less than the Threshold

    Detected
 SuperPreamble   0 0 … 0 17 17 … 17 31 31 … 31 25 25 …
     Index

                                  Search all fractional mode again


Submission                  Slide 42      ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                           doc.: IEEE 802.22-06/0005r5




             Subchannelization




Submission          Slide 43   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                    doc.: IEEE 802.22-06/0005r5

 Symbol Structure For AMC/Diversity Subchannel

 • The concept of AMC subchannel is same to that of
   802.16-2004
 • The concept Diversity subchannel is same to the DL
   optional FUSC of 802.16-2004
 • Just the number of used subcarriers is different
    – 802.16e: no. of subchanel=32, no. of subcarriers per
      subchannel=54
    – 802.22: no. of subchanel=30, no. of subcarriers per
      subchannel=56
 • So the basic permutation sequence will be slightly
   modified

Submission                   Slide 44   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                    doc.: IEEE 802.22-06/0005r5

              Pilot Pattern Design (1)
 • Pilot pattern is varied with channel condition
 • Pilot pattern is controlled by adjusting the pilot symbol
   interval and pilot subcarrier interval
 • A robust channel parameter estimation is required for
   reliable pilot design




Submission                   Slide 45   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                                doc.: IEEE 802.22-06/0005r5

                         Pilot Pattern Design (2)
 • RMS delay spread of WRAN profile (Approximated)
             Multipath Profile             A                   B                   C                 D
         RMS Delay Spread               692 ns            847 ns               1073 ns          5917 ns (*)
     (*) We assume that the 6-th path has the excess delay of 60 ns and relative amplitude of -10 dB

 • Pilot subcarrier interval can be determined as follows
       – Pilot subcarrier interval*subcarrier spacing < coherent bandwidth
          Multipath Profile
                                          A                     B                      C                 D
   Parameters
       Coherent      90%                28.90                 23.61                18.63               3.38
     Bandwidth
        (kHz)        50%               289.02                 236.13              186.39               33.80
         Pilot       90%                8.63                   7.05                 5.56               1.00
      Subcarrier
       Interval      50%                86.32                 70.52                55.67               10.09
 1) We assume that the BW is 6 MHz and FFT mode is 2K.
 2) 90% coherent BW=1/(50*rms delay spread), 50% coherent BW=1/(5*rms delay spread)
Submission                                         Slide 46         ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                         doc.: IEEE 802.22-06/0005r5

                          Pilot Pattern Design (3)
 • Coherent Time
       – 1/fm, where, fm is the maximum doppler shift
 • Pilot symbol interval can be determined as follows
       – Pilot symbol interval*OFDMA symbol time < coherent time
                                    Multipath Profile
                                                             A         B         C         D
              Parameters

                  Maximum Doppler Shift (Hz)                               2.5

                       Coherent Time (sec)                                 0.4

                       Pilot Symbol Interval                            1071.4

             Here, we assume that the BW is 6 MHz, FFT mode is 2K, and GI mode is 1/4.




Submission                                        Slide 47   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                           doc.: IEEE 802.22-06/0005r5

             Pilot Pattern For AMC Subchannel
 • Typical BIN structure
       – Set of 14 contiguous subcarriers within an OFDMA symbol


                                             12 Data Subcarriers




                                             2 Pilot Subcarriers




 • AMC subchannel consists of 4 contiguous bins


Submission                        Slide 48     ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                           doc.: IEEE 802.22-06/0005r5

       Pilot Pattern For Diversity Subchannel
 • All the pilot subcarriers are allocated first
 • And then the remaining subcarriers are used
   exclusively for data transmission
 • Number of used subcarriers are divided into 14
   contiguous subcarriers in which two pilot subcarriers
   are allocated
 • The position of the pilot subcarriers in 14 contiguous
   subcarriers varies according to the index of OFDMA
   symbol which contains the subcarriers
 • Pilot subcarrier index: 7k  3m 1
       – k : pilot subcarrier index, 0,…,239 for 2K mode
       – m : [symbol index] mod 3


Submission                          Slide 49   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                              doc.: IEEE 802.22-06/0005r5




             Advanced Channel Coding




Submission             Slide 50   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                 doc.: IEEE 802.22-06/0005r5

                             Channel Coding
 • Coding Scheme
       – Mandatory: Convolutional Code -> similar to 802.16
       – Optional:
             • Duo Binary Turbo Code
             • LDPC Code (IEEE 802.16e LDPC) New
             • Shortened block turbo code New
       – Optional advanced codes currently undergoing cross-simulations
             • Will compare results and select best optional code(s)


 • Selected Code Rates
       – R = 1/2, 2/3, 3/4, 5/6



Submission                                Slide 51   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                           doc.: IEEE 802.22-06/0005r5


             Duo-Binary Turbo-Code Summary
 • Excellent performance for wide range of blocks
       – Have optimized parameters for blocks from 6 bytes to 240 bytes
 • Highly flexible scheme
       – Same encoder/decoder for all blocksizes/coding rates
 • Reasonable complexity
       – ~35% decrease in complexity/decoded bit compared to Binary TC.
 • Mature Technology
 • Code Reuse/ Already in following standards
       – IEEE 802.16 / WiMAX; HomePlug, DVB-RCS, DVB-RCT,
         ETSI HIPERMAN



Submission                          Slide 52   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                             doc.: IEEE 802.22-06/0005r5


             Low-Density Parity-Check Codes

• Motivation for LDPC
     – Near capacity performance
     – High-throughput low-complexity implementation
     – Code reuse between 802 specifications
• Features of IEEE 802.16e LDPC codes
     –   Compact representation of code matrices
     –   Simplified structured encoder/decoder architecture across all code rates
     –   Low-complexity differential-style encoding
     –   Enhanced Layered Decoding to reduce the number of iterations
     –   Special design feature in rate 1/2, 2/3 code provides further throughput
         doubling in layered decoding


Submission                            Slide 53   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
   March 2006                                                            doc.: IEEE 802.22-06/0005r5


                     LDPC Code Reuse Within 802
• LDPC codes adopted in DVB-S2, 802.16e, 802.11n
• IEEE 802.16                                                                                                      to/from
                                                                                                                   rooftop
    – Initial WiMax profile includes                                                                               antenna
                                                                                                  802.22 radio
         • CC and CTC, Chase Combining HARQ for CTC
    – Future WiMAX profiles likely to include…
         • CTC with incremental redundancy (IR) HARQ                              ethernet         Common
                – IR may add little value for fixed access                                         baseband
                                                                                                   elements
         • LDPC with Chase Combining
                – Missed first profile due to time-to-market considerations
• IEEE 802.11n                                                                                   802.11n radio
                                                                                    to/from
    – IEEE 802.16e-style LDPC codec adopted as the only                              indoor
      advanced channel coding scheme in January 2006 joint                          antenna

      proposal
• Selecting LDPC for 802.22 would lead to additional
  reuse


   Submission                                          Slide 54    ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                doc.: IEEE 802.22-06/0005r5

          Shortened Block Turbo Code (SBTC)

      •      Turbo product code (TPC) is an advanced coding
             option in 802.16
      •      STBC is an improved form of TPC
             – SBTC has lower decoding complexity than TPC without
               performance loss
      •      Component code
             – Extended Hamming code
                •   Native code: (16,11), (32,26) and (64,57)
                •   Other code rate through shortening
             – Parity check code
                •   (8,7) and (16,15)




Submission                               Slide 55   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
 March 2006                                            doc.: IEEE 802.22-06/0005r5


  Parity Check Matrices for Hamming Codes

              1   0 1  1 0 1                       1      0 1  1 0 1
              0   1 1  0 1 1                       0
N’ = 15                                                     1 1  0 1 1
                                                                        
K’ = 11       0   0 0  1 1 1                       0      0 0  1 1 1
                                                                      
              0   0 0  1 1 1 415
                                                      0      0 0  1 1 1
              1   0   1  1         0 1             0      0 0  1 1 1
              0                                                        
                   1   1  0         1 1             0      0 0  1 1 1 663
                                       
N’ = 31       0   0   0  1         1 1
K’ = 26                                
              0   0   0  1         1 1                        N’ = 63
              0
                  0   0  1         1 1 531
                                                                K’ = 57
Special parity check matrix design simplifies the decoding complexity.
The syndrome value gives the error position, thus, look-up table is not needed.
 Submission                           Slide 56   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                               doc.: IEEE 802.22-06/0005r5




             Multiple Antennae Options




Submission              Slide 57   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                         doc.: IEEE 802.22-06/0005r5


                Multiple Antenna Options
Multiple antennae techniques offer various advantages in
various scenarios, including inherent benefits for the
protection of incumbents. We are studying the following
options. Final decisions on which ones are included will be
based on performance and complexity.
      – Equal Gain Transmit Beamforming Using Codebooks.
      – Downlink Closed Loop SDMA.
      – Adaptive Beam-Forming Techniques.
      – Space Time Block Coding (STBC).
      – Combined Diversity/Spatial multiplexing/Delay Management.
      – Uplink “Virtual” SDMA MIMO.

Submission                        Slide 58   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                   doc.: IEEE 802.22-06/0005r5


             Equal Gain Transmit Beamforming

 • When multiple antennae are used for transmission, it is
   very important to have equal gain transmissions from
   each antenna, especially when used with OFDM.

 • Eigen-beamforming, when used in an asymmetrical
   situation (NT > NR), DOES NOT guarantee equal
   power.

 • Single-stream or multiple stream transmission is
   proposed


Submission                  Slide 59   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                   doc.: IEEE 802.22-06/0005r5
     Quantized Equal Gain Beamformer For
                Single Stream
 • NT transmit antennae and NR receive antennae (NR could be 1).
 • Objective: find quantized beamformer Q (NT X 1).
 • Method:
    – All entries of Q are restricted to be  1  j
       –     First entry is fixed at 1+ j
       –     Q is picked to maximize Q H H H H Q
       –     No. of bits required to specify Q: 2*(NT -1) per frequency bin.
       –     If p consecutive frequencies are grouped, Q is picked to maximize
                                    p
                                    Q H Hi H Hi Q i
                                       i
                                   i 1
       – e.g: 2x1 beamformer, grouping 4 tones over 64 tones bandwidth would
         require only 4 bytes of feedback, with ~ 1dB degradation.

 • Multiple streams: find multiple beamformers of that form for the
   simultaneous transmission of multiple streams to 1 user


Submission                                 Slide 60    ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                               doc.: IEEE 802.22-06/0005r5

             Quantized Equal Gain Beamformer
                       Performance Summary
 •    Performance summary was presented in January 2006 [doc.: IEEE 802.22-
      06/0005r1]

 •    Very simple and efficient codebook based beamforming, ensuring equal gain
      transmissions.

 •    About 6 –7dB downlink gain with 2 transmit antennae.
 •    About 11-12dB downlink gain with 4 transmit antennae.

 •    Similar gains on uplink, with receive-diversity at base-station.

 •    Gains can be realized with about 4 bytes of feedback per user for 2 transmit
      antennae and 12 bytes per user for 4 transmit antennae.

 •    CPE could have more receive antenna than transmit antennae, for added
      performance, without changing the feedback requirements.



Submission                              Slide 61   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                              doc.: IEEE 802.22-06/0005r5

 Downlink Closed-Loop SDMA (CL-SDMA)
        Linear processing with downlink channel sounding

• Throughput performance was presented in January 2006 [doc.: IEEE 802.22-
06/0016r1]

• Very large throughput can be achieved by the use of reliable channel state
information at the transmitter in slowly fading channels, to allow for coordinated
beamforming between the transmitter and the receivers

• Practical implementation:
     – In FDD or TDD: CL-SDMA Mode 1 (2 base station antennas)
          No channel reciprocity requirement: finite-rate quantized feeedback
     – In TDD: CL-SDMA Mode 2 (2 or more base station antennas)
          Requires channel reciprocity: direct uplink sounding

• Use on adjacent permutation subcarriers with multiuser diversity


Submission                             Slide 62   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
     March 2006                                                        doc.: IEEE 802.22-06/0005r5

                                    CL SDMA Overview

                  x1                                                                       x1 estimate
                               M1                                            W1*
                                                  1

                  xk                                    downlink                                 xk estimate
                                                  2
                               Mk                     transmission                 Wk*
                                                  k


                  xN                              N                                          xN estimate
                               MN                                           WN*


                       Base station transmitter                      CPE receivers

The Base Station has N transmit antennas, and uses N beamforming vectors M1 … MN
CPEs have N or more receive antennas, and use beamforming vectors W1 , W2 … WN
CL SDMA Mode 1 is only applicable with N = 2 transmit antennas.
     Submission                                       Slide 63   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                                            doc.: IEEE 802.22-06/0005r5

    Base Station Transmitter and CPE Receiver Structures
                                                               M1,1


                                                                                                 OFDM
             User 1        Channel          QAM                 X                      +        Modulation   1
             Data Packet   Encoder        Modulation                   X

                                                                      M1,2


                                                               M2,1



             User 2        Channel          QAM                 X
                                                                                                 OFDM
             Data Packet   Encoder        Modulation                   X               +        Modulation   2


                                                                      M2,2
                                                              W*k,1


                                                                               OFDM
                                                                X            Demodulation          1

                                                              W*k,2


                     Channel            QAM                                    OFDM
                     Decoder         demodulator     +          X            Demodulation          2


                 User k decoded                               W*k,N
                 Data Packet

                                                                               OFDM
                                                                X            Demodulation          N


                                                                                            Receiver or user k
                                                   MMSE or ZF per tone

Submission                                                   Slide 64         ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                           doc.: IEEE 802.22-06/0005r5


                  Adaptive Beam-Forming

 • Adaptive beam-forming (ABF) for 802.22 systems:
       – Mitigate co-channel interference (CCI) inherent to OFDMA
         systems
       – Since all CPEs are fixed at known locations, their directions-of-
         arrival (DOAs) may easily be obtained at the BS.
       – Large cell in 802.22 networks also makes beam-forming problem
         simple from 2D to 1D problem: easy DOA estimation.
       – With the transmit and/or receive diversity, adaptive beam-forming
         may significantly increase the cell radius.
 • More efficient than fixed-beam array



Submission                          Slide 65   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                             doc.: IEEE 802.22-06/0005r5


         Adaptive Beam-Forming Algorithms

 • DOA Based Sample Matrix Inversion (SMI) Algorithm
                    w  R u 1a q 
                    ˆ ˆ

     where a q  is the steering vector for incident angle q and R u is the
                                                                  ˆ
     estimated interference-plus-noise covariance matrix.

 • Reference Signal Based SMI Algorithm
                    ˆ ˆx ˆ
                    w  R1rxd
              ˆ                               ˆ
      where rxd is the correlation vector and R x is the estimated covariance
      matrix.
       – Reference signal is required!

Submission                            Slide 66   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                        doc.: IEEE 802.22-06/0005r5
               Adaptive Beam-Forming
                   Performance Summary
 • Performance summary was presented in January 2006 [doc.:
   IEEE 802.22-06/0005r1]
 • Efficient CCI cancellation by simple adaptive beam-forming
   algorithms
 • In uplink, the reference signal method seems more effective due to
    – Simplicity in implementation
    – Robustness to calibration errors due to self-healing nature
    – However, in case of a very large delay spread, the DOA based
       approach seems preferable.
    – Selective usage according to environments may be necessary.
 • In downlink, the DOA based adaptive beam-forming seems more
   desirable.
    – Robustness to calibration errors in downlink
Submission                       Slide 67   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                     doc.: IEEE 802.22-06/0005r5


                               General STBC


                                                        IFFT         Cyclic prefix            h 1~ 4
         Binary      Data              STBC
       input data   mapping
                                S/P
                                      Encoding                     Cyclic prefix
                                                                                   
                                                        IFFT




                Cyclic
                                       Linear                         Data             Binary
                prefix        FFT                       P/S
                                      Combiner                      demapping        output data
               Removal




                    Figure. Block diagram of an STBC-OFDM system


Submission                               Slide 68       ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                             doc.: IEEE 802.22-06/0005r5

                                     STBC
                          Performance Summary

 •    Performance summary was presented in January 2006 [doc.: IEEE
      802.22-06/0005r1]
 •    2K FFT OFDMA, 2 OFDM symbols preamble, and channel estimation
       – Partitioned MMSE estimation performed by using the preamble
       – SNR in MMSE: 20dB
       – RMS delay parameter in MMSE: 9ms

 •    About 3 –7dB downlink gain for r=0.7, when employing (2 x 1) STBC
      scheme.
 •    Additional ~2.5dB gain when employing (2 x 1) closed loop transmit
      diversity.
 •    Even in a highly correlated case, for example r=0.9, the performance
      improvement is rather significant.


Submission                            Slide 69   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
 March 2006                                        doc.: IEEE 802.22-06/0005r5


              Full Diversity Full Rate Scheme
• While Space-Time Coding (STC) aims for transmit diversity gain,
  Spatial Multiplexing (SM) increases the throughput in MIMO channels.

• Full Diversity Full Rate (FDFR) schemes strike both the diversity and
  multiplexing at the same time.

• In FDFR, complexity at the receiver is much higher than SM.

• We propose a scheme, which facilitates successive interference
  cancellation at the receiver with slight loss in rate.

• Thus, the proposed scheme is FD but almost FR.

 Submission                       Slide 70   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                     doc.: IEEE 802.22-06/0005r5


             Basic Transmit Beamforming (BTB)
   •    In DL, beamformer only directs transmission to the path/cluster with the
        strongest gain per user.
   •    Other directions are suppressed – reducing overall delay
   •    Frequency domain beamforming for each user (subchannel) – different
        directions


                                                                     Windowing
                              Frequency          OFDMA               & Pulse                Ant 1
             User 1    MOD     Domain            Formulator          Shaping
                             Beamformer                                                 .
                                                     .                                  .
                                                     .                                  .
                                                     .
              User K          Frequency                              Windowing
                                                 OFDMA               & Pulse                Ant NT
                       MOD     Domain
                             Beamformer          Formulator          Shaping




Submission                                Slide 71       ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                                 doc.: IEEE 802.22-06/0005r5
                  Transmit Beamforming with
                  Diversity/Spatial Multiplexing

   •    In DL, beamformers direct transmission several pathss/cluster
   •    Uncorrelated eigen-channels may be used for diversity transmission (CDD)
        or spatial multiplexing.

                                         Frequency
                                          Domain                                          Windowing
                                        BF 1, User 1                        OFDMA         & Pulse        Ant 1
                                                            Vector          Formulator    Shaping
                                                            Adder

                             Phase       Frequency
             Channel   MOD   Shifter,                                                                    .
                                          Domain                             .
             Coded           User 1                                                                      .
                                        BF 2, User 1                         .
             Bits of                                                                                     .
             User 1                                                          .




                                         Frequency
                                          Domain                                          Windowing
                                        BF 1, User L                        OFDMA         & Pulse
                                                            Vector                                           Ant NT
                                                                            Formulator    Shaping
                                                            Adder

                             Phase       Frequency
             Channel
                       MOD   Shifter,     Domain
             Coded           User L     BF 2, User L
             Bits of
             User L


Submission                                             Slide 72      ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
       March 2006                                                 doc.: IEEE 802.22-06/0005r5

           Beamforming with Channel Delay Management
    When the overall channel delay exceeds the cyclic prefix period, spatial resolution
    of multipaths in the angular domain allows to alleviate the inter-block interference.


                                             Reflector 1
                                                                                         CPE
                                   Beam 1
                                             Or repeaterDelay 1 T             = τ1+ D1
                                                                          1
                                                                                                   Overall Delay
                                                                                                    |T1-T2| +δ
Stream 1

           Pre-alignment
Stream 2   & beamforming

                                            Reflector 2Delay 2 T2 = τ2+ D2
                                            Or repeater               Rich local scatters
                                  Beam 2

             By adjusting timings D1 and D2, the overall delay of the channel can be changed.


      Submission                                 Slide 73   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                 doc.: IEEE 802.22-06/0005r5

                              Uplink SDMA
                         (formerly Virtual MIMO)
     •       Uplink
     •       Multiple Antennas at BS and single antenna at each CPE
     •       Multiple CPEs share the same physical channel
     •       Spectrum efficiency increase linearly with CPE number if the CPE
             number is less than the number of BS antennas




                                                                     Base


                 CPE 1


                           CPE 2

Submission                                Slide 74   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
     March 2006                                                doc.: IEEE 802.22-06/0005r5

                  IEEE 802.16e Uplink Channel Sounding
•   Presented in January 2006: 22-06-0013-00-0000_Uplink_Channel_Sounding.ppt
•   ULCS is a means of providing channel response information to the BS on an as-needed basis
     – CPE transmits sounding waveform on the UL to enable the BS to measure the channel response
     – Intended for TDD systems where UL&DL RF reciprocity can be leveraged

•   ULCS enables Closed-Loop Transmit Antenna Array Techniques on the DL in TDD:
     – Baseband digital transmit beamforming
     – Transmit Spatial Division Multiple Access (SDMA)
     – Closed-loop Multiple Input Multiple Output (MIMO)

•   ULCS provides an easier and better-performing alternative to other 802.16e Closed-Loop
    techniques with minimal added complexity to the CPE
      – Lower channel measurement delay
      – Better frequency-response tracking

•   Future-Proof: Transmit array algorithms can be upgraded at the BS with no impact on CPE
     – Technique is independent of the number of BS antennas

•   Handles asymmetric bandwidth occupancy of UL&DL transmissions

     Submission                               Slide 75   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                  doc.: IEEE 802.22-06/0005r5


             Multiple antennas on-going work

 • A spatial channel model for the WRAN is currently
   under development by the joint proposers.

 • Supporting features, such as uplink channel sounding,
   specific preamble design, MAC messages.

 • Performance evaluation and selection of the proposed
   schemes.



Submission                 Slide 76   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                          doc.: IEEE 802.22-06/0005r5




             Spectrum Sensing




Submission         Slide 77   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                   doc.: IEEE 802.22-06/0005r5

             Spectrum Sensing : Fact

 • Spectrum sensing should be accurate enough to protect
   incumbent users
 • Spectrum sensing should be fast enough to support the
   sensing protocol in MAC
 • Spectrum sensing block should be able to be implemented
   by reasonable cost/resources
 • “Spectrum sensing technology” is implementation
   technology.
 • There is no single sensing technology can meet all the
   sensing requirement.




Submission                  Slide 78   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                     doc.: IEEE 802.22-06/0005r5


       Spectrum Sensing : What we proposed

 • We proposed a “sensing system architecture”, not an
   individual sensing technology, which we believe is the most
   efficient way to support MAC while sustain accuracy.

 • Within this system architecture, multiple sensing
   technologies can be chosen to meet the sensing
   requirements (time, sensitivity) by the manufacturer

 • We’ve been trying to include various sensing technologies
   for primary user group to feel comfortable on WRAN




Submission                    Slide 79   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                    doc.: IEEE 802.22-06/0005r5


             Sensing Receiver Architecture

    Omni Antenna


                          Fine/Feature



                   RFE        Control             MAC



                         Energy Detection




Submission                  Slide 80    ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                               doc.: IEEE 802.22-06/0005r5

              Spectrum Sensing Strategy
                   Begin Sensing



                   Energy Detection
                     for wide band
                                                           Fine/Feature Detection
             (Analog, RSSI, MRSS, FFT…)
                                                              for single channel



  Spectrum                                                                 Field     Optimum
   Usage
                       MAC                         FFT             CSFD
                                                                           Sync     Radiometer
                        (Select
  Database          single channel)
    (BS)                                          Spectral                 ATSC     Multi-cycle
                                                                   AAC    Segment
                                                 Correlation                         Detector
                                                                            Sync



                                                               Y
                                                                     occupied?


                    End Sensing                                             N


Submission                            Slide 81   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                    doc.: IEEE 802.22-06/0005r5

    List of sensing techniques included in the
                     proposal
       •     Energy detection
              –   Analog integrator
              –   MRSS (Samsung/GT)
              –   RSSI (Philips)
              –   FFT
       •     Fine/Feature Detection
              –   Cyclo-Stationary Feature Detection (Samsung)
              –   Field-sync detection (Philips)
              –   ATSC Segment Sync (Thomson)
              –   FFT based (Philips and Huawei)
              –   Optimum radiometer (France Telecom)
              –   Multi-cycle detector (France Telecom)
              –   Analog Auto-Correlation (Samsung/GT)
              –   Spectral correlation (Huawei)

Submission                                   Slide 82   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                         doc.: IEEE 802.22-06/0005r5


             Spectrum Sensing : What we will do

•   Each of the sensing technology will be rigorously evaluated by the
    procedure to be defined.

•   Individual sensing technologies that pass the evaluation process
    shall be included the draft as an optional.

•   Our proposal is open to new innovative sensing technology.




Submission                        Slide 83   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                         doc.: IEEE 802.22-06/0005r5




             Backup Slides




Submission        Slide 84   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 85   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 86   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 87   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 88   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 89   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 90   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 91   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 92   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 93   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 94   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 95   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 96   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 97   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 98   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                    doc.: IEEE 802.22-06/0005r5




Submission   Slide 99   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 100   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 101   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 102   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 103   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 104   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                   doc.: IEEE 802.22-06/0005r5


                      Disclaimer

 • The following set of slides are restricted to describe
   only the updates to the MAC proposal described in
   documents 22-06-0003-01-0000 and 22-06-0005-01-0000
   (presented in January/2006)

 • The following updates together with document 22-06-
   0003-03-0000 represent the entire joint ETRI-France
   Telecom-I2R-Motorola-Philips-Samsung-Thomson
   MAC proposal



Submission                 Slide 105   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 106   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 107   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                     doc.: IEEE 802.22-06/0005r5


                               MAC Highlights
 • Some aspects of MAC have been inspired by the 802.16 MAC
       – E.g., Frame format and QoS model

 • However, major enhancements have been made
       – A new superframe structure for better coexistence and self-coexistence,
         synchronization, Part 74 beacon support, support for bonding, etc.
       – Support for multiple channel operation (contiguous or not)
       – Enhanced support for Adaptive Antenna System
       – Coexistence with both incumbents and itself (self-coexistence);
             •   Incumbent user avoidance and Spectrum measurements (incumbents and itself)
             •   Channel classification and Management
             •   Dynamic resource sharing, Coexistence Beacon Protocol (CBP), and Etiquette
             •   Synchronization of overlapping BSs and quiet periods
             •   Two-stage fast and fine sensing mechanism and opportunistic sensing
             •   Embedded wireless microphone beacon mechanism
             •   Clustering support
Submission                                   Slide 108   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 109   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 110   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 111   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                             doc.: IEEE 802.22-06/0005r5
       Support for Adaptive Antenna System
                      (AAS)
 • Channel state information can be done in two ways:
       – Reciprocity: Assumes the upstream channel state estimation as the
         downstream channel state
       – Feedback: CPE explicitly transmits the estimated channel to the
         BS
 • Two channel feedback options are available:
       – New MAC control messages (namely, AAS-CFB-REQ and AAS-
         CFB-RSP) have been defined
       – Piggybacked together with the existing measurement reports used
         for incumbents and other 802.22 systems
 • Bandwidth request, incumbent notifications,
   measurement reports, etc.:
       – Can be done using either the broadcast allocations or by polling

Submission                           Slide 112   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 113   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 114   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 115   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 116   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 117   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 118   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 119   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 120   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 121   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 122   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 123   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 124   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 125   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 126   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 127   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 128   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 129   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 130   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 131   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 132   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                     doc.: IEEE 802.22-06/0005r5


                           Frequency Hopping
 • Purpose
       – To dismiss any presumption that the proposed MAC does not allow
         frequency hopping
 • Treated as an optional implementation issue provided the
   technical hurdles can be overcome
 • In order to avoid an in-band quiet period, a WRAN may hop to a
   Channel A provided:
       – The Channel A evaluation meets the Channel Availability Check Time as
         specified in the FRD
       – The Channel A is not occupied by any incumbent
       – The Channel A is not occupied by any 802.22 network
             • Otherwise, it may be worse than sticking to your current channel
       – Adjacent channels have also been checked for the presence of incumbents,
         as to adhere to the EIRP profile

Submission                                   Slide 133   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                            doc.: IEEE 802.22-06/0005r5


             Support for Single Channel CPE

 • At this point, channel bonding (of up to 3 contiguous
   TV channels) is an optional feature
       – This implies that BSs and CPEs may have different capabilities


 • What happens if a BS is in channel bonding mode when
   a single channel CPE attempts to joint the network?

 • To support this feature, an Alert Window (AW) is
   added to the superframe structure
       – Used to notify the BS about incoming CPEs who cannot operate in
         the same mode as the BS

Submission                          Slide 134   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 135   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 136   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 137   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 138   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 139   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                             doc.: IEEE 802.22-06/0005r5
       Quiet Period Management for Sensing
                     (cont.)
 • Given that the nature of incumbent appearance on a
   channel is sparse (e.g., new TV stations do not come on
   the air every hour):
       – The fast sensing stage will be enough most of the time
       – Hence, the fine sensing stage will not need to be performed
       – Even if the fine sensing stage is required to be performed, its
         duration will exactly fit how much is required to be measured


 • Therefore, with this mechanism:
       – Not only will incumbents have their protection guaranteed
       – The stringent QoS requirements specified in the FRD will be met


Submission                           Slide 140   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 141   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 142   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 143   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 144   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 145   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 146   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 147   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 148   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 149   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 150   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 151   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 152   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 153   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 154   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 155   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 156   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 157   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 158   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 159   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 160   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 161   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 162   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                     doc.: IEEE 802.22-06/0005r5




Submission   Slide 163   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson
March 2006                                                doc.: IEEE 802.22-06/0005r5


                                  Conclusions
 • Presented the PHY proposal and updates to the MAC proposal
       – The proposal contains numerous mechanisms to protect incumbents while
         meeting the requirements set forth by the 802.22 WG

 • PHY
       – Based on OFDMA
       – Flexible channel configurations
       – TV and Part 74 service detection and protection

 • MAC
       – Coexistence is a key feature
             • Incumbent protection
             • Self-coexistence
       – CBP, dynamic resource sharing, channel bonding, etc.

Submission                              Slide 164   ETRI, FT, I2R, Motorola, Philips, Samsung, Thomson

				
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