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Questions Concerning the PBCC-22 Proposal for High Rate 802.11b Christopher Hansen Broadcom

Analysis of PBCC-22 code for high-speed 802.11b. Simulations, performance comparison with other codes, and conclusions.

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Questions Concerning the PBCC-22 Proposal for High Rate 802.11b Christopher Hansen Broadcom

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  1. Questions Concerning the PBCC-22 Proposal for High Rate 802.11b Christopher Hansen Broadcom Christopher Hansen, Broadcom

  2. Outline • Introduction • What does the cover code do? • Simulation of the 22 Mbps system with and without the cover code • Is the PBCC-22 code the best choice? • Compare with published codes • Conclusions Christopher Hansen, Broadcom

  3. What does the cover code do? • Simulated System Random Bits 256 State Encoder and Mapper 2 Channel Model Fractionally Spaced Equalizer Cover Code AWGN Measure Bit Errors Viterbi Decoder Remove Cover Code Christopher Hansen, Broadcom

  4. What does the cover code do? Christopher Hansen, Broadcom

  5. What does the cover code do? Christopher Hansen, Broadcom

  6. What does the cover code do? Christopher Hansen, Broadcom

  7. Is the PBCC-22 Code the best choice? • PBCC-22 Code • 256 State, Rate 2/3, 8-PSK constellation • Dfree^2/Es = 8.6 dB • Ungerboeck Code • IEEE Communications Magazine, Feb. 1987 • 256 State, Rate 2/3, 8-PSK constellation • Dfree^2/Es = 8.75 dB Christopher Hansen, Broadcom

  8. Is the PBCC-22 Code the best choice? • Higher Dfree will yield lower bit and frame error rates for a given SNR • Many published trellis codes available • Significant coding gain is possible with low levels of complexity • For Example: Ungerboeck 64 state code with Dfree^2/Es = 8.01 dB Christopher Hansen, Broadcom

  9. Conclusions • PBCC-22 cover code does not appear to provide any performance gain • PBCC-22 trellis code is not necessarily the best for high rate 802.11b • Given the proposal of a new code for high rate 802.11b, the PBCC-22 authors should present more information to justify their design choice. Christopher Hansen, Broadcom

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