IEEE 802.22.1 Packet Error Rates for MSF1 and MSF2 by wvz16198

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									March 2008                                                                                                                doc.: IEEE 802.22-08/0104r0

                               IEEE 802.22.1 Packet Error Rates
                                     for MSF1 and MSF2
                         IEEE P802.22 Wireless RANs                                                                      Date: 2008-03-19
Authors:
Name                                  Company                             Address                                      Phone                           email
Stephen Kuffner                       Motorola                            Schaumburg, IL,                              847.538.4158                    stephen.kuffner@
                                                                                                                                                       motorola.com
                                                                          USA




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Submission                                                                                  Slide 1                                                       Stephen Kuffner, Motorola
March 2008                            doc.: IEEE 802.22-08/0104r0


                       Abstract

 This submission presents the simulated packet error rates
   for TG1 subframes MSF1 and MSF2 with packets
   structured according to P802.22.1 D2 [1], and considers
   the impact on the interference protection link margin




Submission                  Slide 2               Stephen Kuffner, Motorola
March 2008                                     doc.: IEEE 802.22-08/0104r0


                   Simulation Conditions

 • One trial = one MAC subframe
 • Channels are AWGN or WRAN-B
 • No frequency offset or other impairments considered
 • WRAN-B used fixed magnitude rays per [2] with
   uniform random phase draws per trial
 • Unquantized soft decoding on MSF1
 • 200 errors counted per chip SNR point
       – Should give 95% confidence that PER values are within about
         ±15% of actual value
       – i.e., 1% true PER will give between 0.87% to 1.15% simulated
         PER with 95% confidence


Submission                          Slide 3                Stephen Kuffner, Motorola
March 2008                                                                                 doc.: IEEE 802.22-08/0104r0
                             Packet Error Rates for 17 byte MSF1 with Rate-1/2 Convolutional Code using
                              Draft 2 Puncturing Pattern (34 bytes total) and Unquantized Soft Decoding
                                    compared with 51 byte MSF2 in AWGN and WRAN-B Channels
                    0
                   10
                                                                                                MSF2 AWGN
                                                                                                MSF2 WRAN-B
                                                                                                MSF1 AWGN
                                                                                                MSF1 WRAN-B




                             X: -3.813                   X: 3.452                   X: 9.482
                             Y: 0.1005                   Y: 0.1002                  Y: 0.1004
                    -1
                   10
                                         X: 2.303
                                         Y: 0.1003
             PER




                    -2
                   10
                    X: -2.575                   X: 4.847               X: 10.29                  X: 17.89
                    Y: 0.01008                  Y: 0.009983            Y: 0.01001                Y: 0.01001




                        -5                0                   5                  10              15                20
                                                                  chip SNR, dB


Submission                                                        Slide 4                                     Stephen Kuffner, Motorola
March 2008                            doc.: IEEE 802.22-08/0104r0


               Results Summary

              MSF1 chip SNR (dB)         MSF2 chip SNR (dB)
        PER
              AWGN        WRAN-B        AWGN            WRAN-B


        10%   -3.8           2.3         3.5                9.5


        1%    -2.5          10.3         4.8               17.9




Submission                  Slide 5               Stephen Kuffner, Motorola
 March 2008                                                  doc.: IEEE 802.22-08/0104r0


                  Link Margin Considerations
  • Express required chip SNR in terms of interference
    link and sensing link parameters [3]
  • Assumptions:
        – Pb = 250 mW, Bbc = 77 kHz; Pw = 4 W, Bw = 5.625 MHz
        – Beacon ant. gain = 2 dBi; microphone Rx ant. gain = 2 dBi;
          WRAN sensing ant. gain = 0 dBi
        – maximum 200 kHz-averaged upfade on interference path
              • F↑ ≈ 2.5 dB for WRAN-B
        – ΔNF ≈ 0 dB, ΔG ≈ 0 dB, I/Nmax = 0 dB
        – Δ is propagation related parameter (next slide…)
        – 6.6 + Δ – 2.5 = 4.1 dB + Δ > Ec/No

       P B 
10 log  b w     (Gb ,tx  G w, sens  Gm ,rx )  F   ( NFw  NFm )  I / N m ax  E c / N o
       P B 
        w bc                                         
                                                                 
                                  G                             NF

 Submission                                   Slide 6                        Stephen Kuffner, Motorola
March 2008                                            doc.: IEEE 802.22-08/0104r0


                        Link Margin Results

 • Antenna-height related path loss clutter parameter Δ
   [4]
       – P.1546 rural, 10 m beacon height: Δ = 16.8 dB
             • 4.1 + 16.8 = 20.9 dB > Ec/No
             • Both MSF1, MSF2 < 1% PER
       – Hata large city, 3 m beacon height: Δ = 2.7 dB
             • 4.1 + 2.7 = 6.8 dB > Ec/No
             • MSF1 PER = 3%
             • MSF2 PER = 18.8%




Submission                                  Slide 7               Stephen Kuffner, Motorola
March 2008                          doc.: IEEE 802.22-08/0104r0


                     References

 [1] P802.22.1/D2, “Part 22.1: Ehanced Protection for
    Low-Power, Licensed Devices Operating in Television
    Broadcast Bands,” October 2007.
 [2] IEEE 802.22-05/0055r7, “WRAN Channel Modeling,”
    E. Sofer, G. Chouinard, September 2005.
 [3] IEEE 802.22-08/0059r0, “Beacon Link Margin by Two
    Methods,” S. Kuffner, February 2008.
 [4] IEEE 802.22-07/0148r0, “TG1 Link Margin
    Calculator,” S. Kuffner, March 2007.


Submission                Slide 8               Stephen Kuffner, Motorola

								
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