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Enhancing 802.11 Networks with 4096-QAM: Feasibility and Beamforming Analysis

Explore the feasibility of 4096QAM in 802.11 networks, focusing on the benefits of Beamforming (BF) on signal-to-noise ratios (SNRs) and Rx EVM requirements. The study evaluates the impact of BF on signal quality and explores various scenarios to support 4096-QAM. Detailed simulation results in Gaussian channels highlight the importance of BF in making 4096-QAM feasible in practical settings. The study emphasizes the need for low Rx EVM for reliable reception and discusses how BF can optimize 4096-QAM performance in specific configurations.

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Enhancing 802.11 Networks with 4096-QAM: Feasibility and Beamforming Analysis

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  1. Feasibility of 4096QAM • Date:04/11/2019 Authors: Sigurd Schelstraete, Quantenna

  2. OFDM modulation sizes • In 802.11, the supported maximum modulation size has been increasing gradually • Initially OFDM supported BPSK, QPSK, 16QAM and 64QAM • 256QAM was introduced in 11ac • 1024QAM was introduced in 11ax • 4096QAM has been suggested for EHT in multiple submissions (see [1], [2]) • The goal of this submission is to understand the requirements needed to support 4096 QAM Sigurd Schelstraete, Quantenna

  3. 4096 QAM and beamforming • It has been suggested that BF may be the key to support of 4096 QAM • With BF, 4096 QAM can be supported at lower SNR • Most BF gain for lower number of streams • Caveat: We still need to consider Rx EVM • Not affected by beamforming • Both effects are evaluated in this submission through simulation Sigurd Schelstraete, Quantenna

  4. Evaluation methodology • Effect of beamforming is simulated in Gaussian channel (Rayleigh distributed) • Complex-valued Gaussian channel • Calculate BER as function of SNR • For various values of N_TX • Rx EVM requirements is estimated by simulating performance in flat channel Sigurd Schelstraete, Quantenna

  5. Beamforming results in Gaussian channel Sigurd Schelstraete, Quantenna

  6. Beamforming results - analysis • Without beamforming, required channel SNR is above 45 dB • Not practically feasible • Beamforming with N_TX=4 reduces the SNR requirement to about 30 dB • N_TX=8 and N_TX=16 provide additional 3 and 6 dB BF gain respectively • Beamforming is essential in making the use of 4096 QAM feasible Sigurd Schelstraete, Quantenna

  7. Rx EVM consideration • In reality, the signal at the receiver will be further affected by Rx EVM • Effectively creating an additional noise proportional to the level of the received signal • Previous simulation results effectively assume unlimited Rx EVM • Rx EVM is not changed by beamforming • But can be improved with extra Rx antennas • To get an understanding of the required Rx EVM, we simulate 4096 QAM in a flat channel Sigurd Schelstraete, Quantenna

  8. Flat channel results Sigurd Schelstraete, Quantenna

  9. Rx EVM discussion • About 35 dB Rx EVM is needed to reliably receive 4096 QAM • Additional Rx antennas can further reduce this number • Beamforming is still essential to improve channel SNR • Channel SNR is no longer the limiting factor Sigurd Schelstraete, Quantenna

  10. Conclusions • BF can reduce the required channel SNR significantly • Devices still need about ~35 dB Rx EVM • EVM requirement can be relaxed when extra Rx antennas are used • Overall 4096 QAM appears feasible in certain configurations • Using Tx BF • Low number of streams (simulations were done for N_STS=1) • Strict Rx EVM requirement or multiple Rx antennas Sigurd Schelstraete, Quantenna

  11. References • [1] Overview of PHY Features for EHT, IEEE 802.11-18/1967r0 • [2] Discussions on the PHY features for EHT, IEEE 802.11-18/1461r1 Sigurd Schelstraete, Quantenna

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