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Enhancing VHT-SIG-A Performance with S-QPSK Modulation in 802.11ac

This paper by Vish Ponnampalam from Mediatek discusses a proposed method for enhancing the detection of VHT-SIG-A bits in multipath environments using S-QPSK modulation. The approach demonstrates a SNR gain of 0.5 to 1 dB and offers improved protection for VHT-SIG-A compared to previous proposals. The study also shows that this method has nearly the same performance as L-SIG while significantly reducing false detection rates in devices. The motivation for this scheme highlights the benefits of S-QPSK for both VHT-SIG-A and VHT-SIG-B, promising higher data throughput in 802.11ac networks.

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Enhancing VHT-SIG-A Performance with S-QPSK Modulation in 802.11ac

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  1. 11ac Auto-Detection: Further Results Authors: Date:2010-07-14 Vish Ponnampalam, Mediatek

  2. Proposed VHT-SIG-A Format Vish Ponnampalam, Mediatek

  3. Better detection of VHT-SIG-A bits in multipath • Overall 0.5-1dB SNR gain • Nearly same performance as L-SIG • Better solution than previous proposals • Compared to 10-0459 • Better protection of VHT-SIG-A • Lower 11n false detection in devices using both HT-SIG symbols • Compared to 10-0628 • Better protection of VHT-SIG-A • Better modulation than BPSK • Compelling case to adopt S-QPSK for VHT-SIG-B and Data Payload Motivation for Proposed Scheme Vish Ponnampalam, Mediatek

  4. 20 MHz Channel • Channel Model: DNLOS • Channel profiles are not normalized • Channel Estimation (non-ideal) • SISO System • Consider Three Scenarios: • AC packets are sent to AC Receiver • Check miss detection rate and packet error rate of VHT-SIG-A; • Legacy packets are sent to AC Receiver • Check false detection rate of BPSK modulated date symbols (worst case for BPSK+SQPSK scheme) • SQPSK used for VHT-SIG-B • Check Packet Error Rate Simulation Conditions Vish Ponnampalam, Mediatek

  5. AC packets to AC Receivers Vish Ponnampalam, Mediatek

  6. VHT-SIG-B Performance Assuming VHT-SIG-B carries 26information bits and thus occupies 1 OFDM symbol with 1/2 –Rate coding; Channel Model D Vish Ponnampalam, Mediatek

  7. 11ac Payload with S-QPSK 3/4–Rate coding; 400 bit payload; Channel Model D Vish Ponnampalam, Mediatek

  8. We propose that the second VHT-SIG-A symbol be modulated using S-QPSK • This approach has two main advantages • VHT-SIG-A error rate improves in multipath channels • We show 0.5-1dB gain in Channel D (42 information bits) • Will be even higher for longer VHT-SIG-A lengths (if more bits are required) • Lower false alarm rate for 11n receivers • S-QPSK can also be used in 11ac for • VHT-SIG-B • We show >2dB gain in Channel D • Data Payload • Even higher gains with higher rate coding Conclusions Vish Ponnampalam, Mediatek

  9. Do you agree that S-QPSK modulation be evaluated further for use in VHT-SIG-A, VHT-SIG-B and data portions of the 11a packet? Strawpoll Vish Ponnampalam, Mediatek

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