IEEE 802.11-18/0849r2 MU Exclusive Beamforming Report May 2018
Explore the detailed May 2018 report on MU Exclusive Beamforming in IEEE 802.11-18/0849r2, focusing on enhancing MU-MIMO performance through beamforming algorithms and channel selectivity analysis in 11ay compared to 11ac. Discover insights on per-tone SNR calculation, differential concepts, and proposed methods for improving MU-MIMO transmission in wireless communications.
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MAY 2018 doc.: IEEE 802.11-18/0849r2 MU Exclusive Beamforming Report field Date: 2018-05-07 Authors: Name Affiliations Address Phone email Sunwoong Yun LG Electronics Seocho LG sunwoong.yun@lge.com R&D Lab, Korea SungJin Park LG Electronics allean.park@lge.com Saehee Bang LG Electronics saehee.bang@lge.com JinMin Kim LG Electronics jinmin1230.kim@lge.com Jinsoo Choi LG Electronics js.choi@lge.com Sanggook Kim LG Electronics San Diego sanggook.kim@lge.com /California/ US Slide 1 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Introduction(1/2) In 11ac, MU Exclusive Beamforming Report field is defined in addition to compressed beamforming report field to enhance MU- MIMO performance Unlike SU-MIMO where feedback is sufficient, MU-MIMO precoding algorithms can get benefit from knowledge of the transmit correlation VS2VH with more accurate S per subcarrier. However, in 11ay, the average SNR per stream within the Channel Measurement Feedback is only defined and there is no additional information for MU-MIMO Slide 2 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Introduction(2/2) So, 11ay also need to define additional information for MU-MIMO transmission similar to 11ac In this presentation, we propose to add MU-Exclusive beamforming report field in the Digital BF feedback element for 11ay Slide 3 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Observation Points(1/3) : Per-tone-SNR Calculation In 11ac, Delta SNR is used for MU Exclusive Beamforming Report where Vk,i is the ith column of the feedback beamforming matrix at subcarrier k, N is the noise plus interference power and is the average SNR of space- time stream i The difference at each per-tone-SNR relative to the average SNR per stream Average SNR has 0.5dB granularity, Delta-SNR has 1dB granularity Also, to reduce feedback overhead, 11ac reports Delta SNRs for tones spaced 2*Ng apart Slide 4 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Observation Points(2/3) : 11ac channel vs 11ay channel 11ay channel has lower selectivity than 11ac Channel TGnD TGnD channel 11ay CR channel Average SNR :10.0052 Max SNR : 11.2592 min SNR : 8.6318 Variance : 0.4359 Average SNR :10.7311 Max SNR : 11.2826 min SNR : 10.0171 Variance : 0.0909 So, we can similarly introduce differential concept into 11ay Slide 5 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Observation Points(3/3) : Issue on conventional method However, in 11ay, [1] shows that channel can have more frequency selectivity due to reflection Moreover, the system design should cover a various of channel environments So, we propose differential SNR method between adjacent tones spaced Ng apart not between average SNR and tones spaced 2*Ng apart in 11ac The range of feedback SNR value is increased Slide 6 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Proposed Method : Differential SNR Differential SNR The relative difference of per-tone-SNR between adjacent Ng tones From -8dB to 7dB with 1dB granularity 2 2 ????,? ? ? ?? ?,? ? ?_????,?= min max ????? 10???10 10???10 , 8 ,7 For the first subcarrier in Ng tones 2 ??????(0)??????(0),? ? ?_????????(0),?= 10???10 Quantized to 8bits in the range -8 dB to 55.75 dB with 0.25 dB granularity. Same Ng value is used for MU Exclusive field not 2*Ng We can reuse tone index in compressed BF without additional definition Slide 7 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Conclusion We propose MU Exclusive Beamforming to enhance MU-MIMO performance similar to 11ac Also, we propose differential-SNR method between adjacent tones spaced Ng apart to increase SNR range to feedback Slide 8 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 Straw Poll #1 Do you agree to accept the text in11-18/0850r1 -Draft text for MU Exclusive Beamforming Report field? Slide 9 LG
MAY 2018 doc.: IEEE 802.11-18/0849r2 References [1] 11-18-0401-00-00ay-reflection-measurements [2] 11-16-1388-00-00ay-implementation-of-channel-models-for-ieee-802- 11ay Slide 10 LG
