Unified CoBF/MUMIMO Schemes with Zero-MUI
This document discusses IEEE 802.11-24/1432r0, presenting unified Coordinated Beamforming/Multi-User Multiple Input Multiple Output schemes achieving Zero-Interference utilizing precoding. The contribution outlines the need for advanced receivers, equivalence between Zero Forcing and Block Diagonalization, and impacts on optimal filtering. It also addresses the sounding and feedback mechanisms in achieving zero mutual interference. Theoretical analyses and proposals for implementation in 11bn are covered.
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August 2024 doc.: IEEE 802.11-24/1432r0 Unified CoBF/MUMIMO Schemes with Zero-MUI Date: 2024-08-21 Authors: Name Affiliation Address Phone Email Aiguo Yan aiguo.yan@samsung.com Zigui Yang Eunsung Jeon 3655 N First St, San Jose, CA 95134 Samsung Srini Kandala Ravi Gidvani Submission Slide 1 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Introduction and Outlines 1. The contribution [1] 23/1998: Zero-MUI Coordinated Beamforming discussed CoBF/MUMIMO schemes, especially with cases of more RX antennas than TX antennas. [1] also stated the schemes needs advanced MVDR-like receivers to achieve zero-MUI. This contribution is proposing unified CoBF/MU-MIMO schemes achieving Zero-MUI with precoding alone. Providing the equivalence between ZF and BD (Block- Diagonalization) Sharing Linearly Constrained Linear Optimal Receivers Analyzing Impacts to Optimal Filtering; UEQMCS; as well as Sounding and Feedback Mechanism. Note: A motion is already passed to have CoBF in 11bn 2. 3. 4. 5. 6. 7. Submission Slide 2 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 MUMIMO Precoding - (1/3) H ZF-1: Good for EQMCS H 1 1 SV S V S V ( ) ( ) 1 = = = H H EQ ; ; H 1 1 V S V S V S W H H H pinv H 1 2 2 3 3 2 2 1 1 1 1 1 EQ ZF EQ EQ EQ H Feedback 3 3 H H H H H 1 1 1 U SV U S V U S V U 1 1 SV S V S V U 1 1 1 = = = = H H H EQ H U U H 2 2 2 2 2 2 2 2 1 H H U U 3 3 3 3 3 3 3 3 U U 1 1 ( ) 1 = = = H EQ H EQ H HW U H H H H U ,1 1 2 1 1 1 1 2 BF ZF EQ EQ U U 3 3 = = _; Zero MUI Theoretically user i user i y H d U d _ ,1, _ _ _ BF user i user i user i # of RX Ants # of TX Ants; ???? is from Feedbacks Submission Slide 3 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 MUMIMO Precoding (2/3) ZF-2: Good for UEQMCS/UEQM H H V V V 1 ( ) ( ) 1 = = = H H EQ ; ; H V V V W H H H pinv H 2 1 2 3 2 2 2 2 2 2 EQ ZF EQ EQ EQ H 2 H U S V V V U S 1 1 1 1 1 = = H H EQ H U S U S H 2 2 2 2 2 2 H U S U S 3 3 3 3 3 U S U S 1 1 1 1 ( ) 1 = = = H EQ H EQ H HW U S H H H H U S ,2 2 2 2 2 2 2 2 2 2 BF ZF EQ EQ U S d U S 3 3 3 3 = = _; Zero MUI Theoretically user i user i y H d U _ ,2, _ _ _ BF user i user i user i # of RX Ants # of TX Ants; ???? is from Feedbacks Submission Slide 4 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 MUMIMO Precoding (3/3) BD BFer may not know H 100% H V V ( ) ( ) = = = a b a BF BF b a 2 ; ; , , W W W W null U S W svd H W 1 1 1 1 1 1 1 1 1 H 3 BFee may not know ???,????_1 100% = = = a b a b ; W W W W W W 2 2 2 3 3 3 ( ) + + = = BF BF y H Wd W d W d H Wd U S d 1 1 1 1 2 2 3 3 1 1 1 1 1 1 H BF,User_1 y y y H H H d d d H W d d d H Wd H W d H W d 1 1 1 1 1 1 1 1 1 = = = W W W H W 2 2 1 2 3 2 2 2 2 2 2 2 H W 3 3 3 3 2 3 3 3 3 H W 1 1 = H H W # of RX Ants # of TX Ants 2 2 BF H W 3 2 Submission Slide 5 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Cases of # of RX Ants > # of TX Ants [1] and others stated that MUI can t be completely eliminated with the traditional pre-coding scheme alone, and hence advanced receivers can be used to suppress MUI at the BFee side. CoBF MUMIMO Submission Slide 6 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 The Unified Scheme (1/2) Each STA has 3 physical, but only 2 virtual, antennas ( ) H 1 11 U H11 # of Virtual RX Ants = # of TX Ants ( ) H H21 1 21 U Similarly for MU cases ( ) H 1 32 U H23 1 ij S ( ) ( ) H24 ( ) H H = 1 ij 0 ij 1 0 , , H U U V V 1 42 U ij ij ij 0 ij S Submission Slide 7 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 The Unified Scheme (2/2) :each matrix is 3 8 : ; ; ; STA H H H H Original AP ( ( ) ( ) ( 22 ) 1 11 21 31 41 ) : ; ; ; AP Modified STA H H H H 2 12 32 42 :each matrix is 2 8. MUMIMO could be done regularly 1 ij S ( ) ( ) H = 1 ij 0 ij 1 0 , , H U U V V ij ij ij 0 ij S ) ) ( ( ( Zero-MUI !!! ( ( ) ) ( ( ; ) ) U ( ( H ) ( ) H H H H 1 11 1 21 1 1 42 : ; ; ; AP STA U H U H H U H 1 11 21 42 31 41 ) ( ; ) ) ( ) H H H H 1 11 1 21 1 32 1 42 : ; ; AP STA U H U H U H U H 2 12 22 32 42 new new new new new new new new ; ; ; ; ; ; ;each matrix is 2 8 H H H H H H H 11 21 31 41 12 22 32 42 ( ( ( ( ) H ( ) ( ) = = + + + = 1 11 new new new y U y H W d W d H W d W d H W d 1 1 11 11 1 21 2 12 32 3 42 4 11 11 1 ) ) ) H ( ( ( ) ) ) ( ( ( ) ) ) = = + + + = 1 21 new new new y U y H W d W d H W d W d H W d 2 2 21 11 1 21 2 22 32 3 42 4 21 21 2 H = = + + + = 1 32 new new new y U y H W d W d H W d W d H W d 3 3 31 11 1 21 2 32 32 3 42 4 32 32 3 H = = + + + = 1 42 new new new y U y H W d W d H W d W d H W d 4 4 41 11 1 21 2 42 32 3 42 4 42 42 4 Submission Slide 8 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Equivalence of ZF and BD ( 1 1 3 V = H V ) ( ) ( ) 1 = = = = a b a b H a b a 2 ; ; ; ~,~, W W W W null W V W not W svd H W 1 1 1 1 1 1 1 1 H ( ) = = H H a b H W 1 1 1 U SV U S V W W U S 1 1 1 1 1 1 1 1 1 BFers have info of S and V, but not U ( ) ( = ) ( ) = = + + = y y H Wd H W d y W d = W d H W d U S d 1 1 1 1 2 2 3 3 1 1 1 1 1 1 ; H W d 2 2 2 2 3 3 3 3 y y y H H H d d d H W d d d H Wd H W d H W d 1 1 1 1 1 1 1 1 1 = = = W W W H W 2 2 1 2 3 2 2 2 2 2 2 2 H W 3 3 3 3 3 3 3 3 3 U S : Other Choices 1 1 = ( ) ( ) ( ) H U S = b H a H a ~,~, or W svd V W svd SV W 2 2 BF 1 1 1 1 1 1 U S 3 3 Submission Slide 9 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 MUI-Mitigation at Receivers Many Ways 1. [1] mentioned MVDR-like receivers. 2. LMMSE-IRC [10] is another well-known option. 3. We propose Linearly Constrained Linear (WMF/ZF/MMSE) Optimal Receivers K M = + = + + y Ax n A x A x n m m m m = m K = + 1 1 m Wanted Interference This optimization problem can be easily solved. We can provide detailed algorithms x = 1 Find linear optimal receivers Wy x K A = with constraints 0 W A + 1 K M Submission Slide 10 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Impacts (1/3) Optimal Channel Smoothing For i-th user: ??(?) = ???,????_?(?)??(?), No MUI. 1. ???,????_?(?) can be known at i-th BFee, and could be independent of other users feedbacks 2. Each user can enable its Optimal Channel Smoothing independently. 3. There are 2 ways to enable Optimal Filtering at BFee(s) a) Feedback S(k) and the optimal V(k) matrices b) Both BFee and BFer know the precoding matrices with high accuracy [6]. Submission Slide 11 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Impacts (2/3) EQMCS and UEQMCS 1. We have many choices for MUMIMO/CoBF pre-coding matrices a) Make all singular value =1 (traditional DL-MU-MIMO) b) Keep original singular values (likely different per user and stream) c) Have desired new singular values. We can therefore choose to use EQ- or UEQ- MCS/MOD per stream per user. 2. Submission Slide 12 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Impacts (3/3) Sounding and Feedback Original: each matrix is 3 8 : AP STAs ( ( ) ( ) ( 22 ) ; ; ; H H H H 1 11 21 31 41 ) : ; ; ; AP STAs H H H H 2 12 32 42 Modified: each matrix is 2 8. MUMIMO could be done regularly = ( 11 11 21 : ; As U H U 1 ij S ( ) ( ( ) H 1 ij 0 ij 1 0 , , , , :STA/AP number i j H U U V V ij ij ij 0 ij S ) ( ) ( ) ( ) ) ( ) H H H H 1 1 1 32 1 42 ; ; AP ST H U H U H 1 21 31 41 calculate SVD with original channels calculate SVD withnewequivalent channels ( 32 32 ; ; U H ) ) ( ( ( ) ( ) ) ( ) H H H H 1 11 1 21 1 1 42 : ; AP STAs U H U H U H 2 12 22 42 calculate SVD withnewequivalent channels ; ; ; H H H calculate SVD with original channels ; ;each matrix is 2 8 H new new new new new new new new ; ; ; H H H H 11 21 31 41 12 22 32 42 1 11 1 32 1 21 1 42 , : need channel estimation from AP1 STA1/2 U U , : need channel estimation from AP2 STA3/4 U U Submission Slide 13 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 11be Sounding Sequence Recap EHT sounding NDP BFRP Trigger BFRP Trigger EHT NDP Announcement EHT beamformer SIFS SIFS SIFS SIFS SIFS EHT Compressed Beamforming/CQI 1 EHT beamformee 1 EHT Compressed Beamforming/CQI 2 : : : EHT beamformee 2 : : : EHT Compressed Beamforming/CQI k EHT beamformee k EHT Compressed Beamforming/CQI k+1 : : : EHT beamformee k+1 : : : EHT Compressed Beamforming/CQI n EHT beamformee n Submission Slide 14 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 11bn Sounding Sequence Proposal Sounding NDP BFRP Trigger(s) NDPA BFer1 Sounding NDP BFRP Trigger(s) BFer2 NDPA CBF Feebacks To BFer2 (Multi-Batch) CBF Feebacks To BFer1 (Multi-Batch) BFees Key point or difference from earlier generations: BFees have to have channel estimations with ALL related BFers for calculation of feedbacks. Exact Details are TBD. ( 1 11 : AP STAs U Calculation/Feedback Order: 1/3 Calculation/Feedback Order: 4/4 ) ( ) ( ( ) ( ) ) ( ) H H H H 1 1 21 1 32 1 42 ; ; ; H U H U H U H 11 21 31 41 calculate SVD with original channels calculate SVD withnewequiva lent channels Calculation/Feedback Order: 3/2 Calculation/Feedback Order: 2/1 ) ( ) ( ( ( ) ( ) ) ( ) H H H H 1 11 1 21 1 32 1 42 : ; ; ; AP STAs U H U H U H U H 2 12 22 32 42 calculate SVD withnewequivalent channels calculate SVD with original channels Submission Slide 15 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 Summary 1. Unified CoBF/MU-MIMO schemes can achieve Zero-MUI with precoding alone, with any kind of RX/TX antenna configurations 2. Linearly Constrained Linear Optimal Receivers are also proposed to mitigate MUI at BFee side. 3. Schemes can enable Optimal Channel Smoothing and UEQMCS/UEQMOD. 4. Proposed to enhance 11bn Sounding and Feedback Mechanism to take better advantage of the Unified CoBF/MU-MIMO schemes Submission Slide 16 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 References [1] 23/1998: Zero-MUI Coordinated Beamforming (Huawei) [2] 24/0011: Coordinated Spatial Nulling (C-SN) Concept (MaxLinear) [3] 24/0012: Coordinated Spatial Nulling (C-SN) Simulations (MaxLinear) [4] 24/1204: Coordinated Beamforming for 11bn (LGE) [5] 23/0776: Performance of C-BF and C-SR (BRCM) [6] 24/1431: Enhancing BF Feedback Mechanism in 11bn (Samsung) [7] 22/1820: BF Feedback with the Optimal SVD (Zeku) [8] 22/1869: TXBF based on the Optimal SVD (Zeku) [9] 22/1413: Thoughts-on-High-Reliability-Communications (Zeku) [10] Book: Next Generation Wireless LANs 80211n and 80211ac Submission Slide 17 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 SP #1/3 Do you agree to include the following text to the 11bn SFD: 11bn will extend 11be s high accuracy MU- MIMO (TB) Sounding and BF Feedback mechanism to all 11bn BF scenarios (such as UL/DL-SU; UL/DL-MU; CoBF; and etc) , as an optional feature . Y/N/A Submission Slide 18 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 SP #2/3 Do you agree to include the following text to the 11bn SFD: 11bn will extend UEQM to all BF modes (such as CoBF and MUMIMO) as an optional feature . Y/N/A Submission Slide 19 Aiguo Yan and et al, Samsung
August 2024 doc.: IEEE 802.11-24/1432r0 SP #3/3 Do you agree to include the following text to the 11bn SFD: 11bn will enhance the Sounding and Feedback Mechanism for CoBF, as an optional feature Note: Exact Details are TBD Y/N/A Submission Slide 20 Aiguo Yan and et al, Samsung
