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160 MHz Transmission Flow

160 MHz Transmission Flow. Authors:. Date: 2010-09-XX. Introduction. TGac has adopted 80 MHz transmission flow [1, 2] This presentation discusses 160 MHz transmission flow Desirable to reuse VHT80 for VHT160, both in standard as well as in implementation Reduce standardization efforts

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160 MHz Transmission Flow

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  1. 160 MHz Transmission Flow Authors: Date: 2010-09-XX Youhan Kim, et al.

  2. Introduction • TGac has adopted 80 MHz transmission flow [1, 2] • This presentation discusses 160 MHz transmission flow • Desirable to reuse VHT80 for VHT160, both in standard as well as in implementation • Reduce standardization efforts • Allow easier path from VHT80 to VHT160 implementation Youhan Kim, et al.

  3. Option 1:Code and Interleave Across 160 MHz • Need to define new interleaver for 160 MHz • All frequency domain HW needs to run twice as fast 512 IFFT 468 tones Spatial Map IFFT DAC Intlv QAM Scrambler FEC 1 Encoder Parser Stream Parser FEC N IFFT DAC Intlv QAM CSD Youhan Kim, et al.

  4. Option 2:Code Across 160 MHz, Interleave per 80 MHz • Reuse 80 MHz HW to support 160 MHz • Easily allows duplication of logic rather than faster clock to support 160 MHz • Same interleaver design as in 80 MHz • No need to design new interleaver for 160 MHz • Coding diversity over the entire 160 MHz 512 IFFT 1,3,5,7,… Intlv QAM Spatial Map IFFT DAC 0,1,2,3,… Frequency Parser 234 tones Scrambler FEC 1 HW supporting VHT80 0,2,4,6,… Intlv QAM Spatial Map Encoder Parser 234 tones Stream Parser HW supporting VHT80 FEC N Intlv QAM CSD IFFT DAC Frequency Parser Intlv QAM CSD Youhan Kim, et al.

  5. Option 3:Code and Interleave per 80 MHz • Also reuses 80 MHz HW • Coding/interleaving diversity only over 80 MHz 512 IFFT Spatial Map Intlv QAM IFFT DAC 234 tones FEC 1 Spatial Map Intlv QAM Scrambler 0,2,4,6,… HW supporting VHT80 Encoder Parser 234 tones Stream Parser FEC 1 0,1,2,3,… Frequency Parser FEC N Encoder Parser 1,3,5,7,… Stream Parser FEC N Intlv QAM CSD IFFT DAC Intlv QAM CSD Youhan Kim, et al.

  6. Number of BCC Encoders • Option 3 requires one more BCC encoder in some cases • Example assuming 600 Mbps / encoder Youhan Kim, et al.

  7. Simulation Setup • Coding : BCC • MIMO receiver : ML • Phase noise : -41 dBc • PA model : Not used • Nes : 1 • Antenna configuration : Min. TX/RX antennas required to support the MCS • E.g. MCS 0  1x1, MCS 21  3x3 • Interleaver for option 1 : Ncol = 39 • Non-contiguous • 480 MHz frequency separation between the center frequency of the two segments 5170 MHz 5330 5490 5730 5735 5835 80 MHz Channels 480 MHz Youhan Kim, et al.

  8. Comparison Youhan Kim, et al.

  9. Conclusion • Option 2 (code across 160 MHz, interleave per 80 MHz) is a reasonable tradeoff between performance and complexity • Performance loss compared to option 1 within 0.2 dB in most cases • For both contiguous and non-contiguous transmissions • Can reuse much of frequency domain processing of VHT80 HW • No need to design a new interleaver for 160 MHz • Requires one less BCC encoder compared to option 3 in some cases Youhan Kim, et al.

  10. Suggested Edits to Specification Framework Document (11-09/0992) • 3.2.4.2.X Segment parser • In case of contiguous and noncontiguous 160 MHz transmissions, even output bits of the stream parser are allocated to the lower 80 MHz and odd output bits to the upper 80 MHz for each stream. First output bit from the stream parser in each symbol is an even bit. • 3.2.4.2.2 Frequency interleaver • For contiguous and noncontiguous 160 MHz transmissions using BCC encoding, the lower and upper 80 MHz portions are each interleaved using the interleaver defined for 80 MHz transmissions. Youhan Kim, et al.

  11. Straw Poll • Do you support editing the specification framework document (11-09/0992) as shown on slide 10 of 10/1063r0? Youhan Kim, et al.

  12. References [1] Srinivasa, S. et al., 11ac 80 MHz Transmission Flow, IEEE 802.11-10/0548r2, July 2010 [2] Stacey, R. et al., Specification Framework for TGac, IEEE 802.11-09/0992r13, July 2010 Youhan Kim, et al.

  13. Backup Youhan Kim, et al.

  14. Option 1 Code and Interleave Across 160 MHz:Ncol • Delta SNR = Additional SNR required to achieve 10% PER compared to best Ncol in each MCS • Ncol = 39 seems to be good choice

  15. Simulation Results (1) • MCS 0 Ch. B Ch. B Ch. D Ch. D

  16. Simulation Results (2) • MCS 7

  17. Simulation Results (3) • MCS 15 Ch. B Ch. B Ch. D Ch. D

  18. Simulation Results (4) • MCS 21, 23 MCS 23 Ch. D MCS 23 Ch. D MCS 23 Ch. B MCS 23 Ch. B MCS 21 Ch. D MCS 21 Ch. B MCS 21 Ch. B MCS 21 Ch. D

  19. Simulation Results (5) • MCS 31 Ch. B Ch. B Ch. D Ch. D

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