Optimal SVD Based TXBF for Next-Gen WiFi Development

This November 2022 document focuses on the application of Optimal Singular Value Decomposition (SVD) in Transmit Beamforming (TXBF) for the next generation of WiFi standards. It discusses the background, objectives of UHR/SG, advantages of Optimal SVD-based TXBF, simulation results, and potential changes for new standards. The document highlights the importance of choosing the right SVD criteria for optimization, the feedback of Optimal V matrices, improvements in WLAN connectivity, latency reduction, throughput increase, and power consumption reduction. Authors Aiguo Yan, Yi-Hsiu Wang, and Xiaogang Chen from ZEKU present an in-depth analysis and simulation outcomes in this presentation.

• Optimal SVD
• TXBF
• Next-Gen WiFi
• UHR/SG
• WLAN Connectivity

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1. November 2022 Doc.: IEEE 802.11-22/1869r0 TXBF based on the Optimal SVD (for Next Gen WiFi) Date: 2022-11-02 Authors: Name Affiliation Address Phone Email 2479 E Bayshore Rd, Palo Alto, CA 94303 Aiguo Yan Zeku aiguo.yan@zeku.com Yi-Hsiu Wang Zeku Xiaogang Chen Zeku Submission Slide 1 Aiguo Yan (ZEKU)

2. November 2022 Doc.: IEEE 802.11-22/1869r0 Outline 1. Background 2. Application of the Optimal SVD in TXBFing 3. Potential changes for the new standards 4. Simulation Results of the Optimal SVD Based TXBF 5. Summary 6. Reference 7. Backup Slides Submission Slide 2 Aiguo Yan(ZEKU)

3. November 2022 Doc.: IEEE 802.11-22/1869r0 Background Objectives of UHR/SG [WNG02,WNG03] 1. Improve reliability of WLAN connectivity, 2. reduce latencies, 3. increase manageability, 4. increase throughput including at different SNR levels and 5. reduce device level power consumption. Some Key takeaways from Sept/2022 Meetings [UHR01,UHR02] 1. Features which address multiple objectives would be considered with higher priority. Background and Advantage of the Optimal SVD based TXBF [WNG01] 1. We had a high-level presentation in WGN in Sept/2022 2. We received many suggestions/comments/questions. 3. Many were eager to see simulations results 4. Now, simulation are showing 2.1 - 2.9 dB gains on average. 5. This kind of gain can be translated into multiple benefits Submission Slide 3 Aiguo Yan (ZEKU)

4. November 2022 Doc.: IEEE 802.11-22/1869r0 Optimal SVD Based TXBFing (hide standards-related details temporarily) = = = = H H H Optimal SVD: 1. SVD is not unique. 2. Choose a SVD that meets our pre-defined optimization criteria. H U SV U SV U SV ( ) = = H H ; diag exp ( ,:) V V D V D D j V end Preference: Smoothness of BFed Channel BF Feedback { ? ? } Raw Channel { ? ? } : ( ) Feedback V k BFer BFee : ( ) ( ) BFed Channel H k V k BFed Channel { ? ? ? ? } Submission Slide 4 Aiguo Yan (ZEKU)

5. November 2022 Doc.: IEEE 802.11-22/1869r0 Optimal SVD Based Feedbacks (see another presentation for details) Optimal SVD: 1. SVD is not unique. 2. Choose a SVD that meets our pre-defined optimization criteria. = = = H H H H U SV U SV U SV BF Feedback { ? ? } Preference: Smoothness of ( ) V k : ( ) Feedback V k Raw Channel { ? ? } BFer BFee : ( ) ( ) BFedChannel H k V k BFed Channel { ? ? ? ? } Submission Slide 5 Aiguo Yan (ZEKU)

6. November 2022 Doc.: IEEE 802.11-22/1869r0 Current Situation in Standards and Potential Changes The Normalized V matrices (i.e., the last row is non- negatively real) are feedbacked The best V matrices for either BFed channel or V re- construction are often not the normalized V matrices 1. 2. Potential Changes to Consider 1. Enable feedback of the Optimal V matrices 2. Limit freedom of TXBFers on re-construction of pro-coding matrices 3. Improve Sounding Accuracy 4. Submission Slide 6 Aiguo Yan (ZEKU)

7. November 2022 Doc.: IEEE 802.11-22/1869r0 Optimal SVD based BFing (11AX PER with the Channel-B) Proof of Concept here. Further optimization is possible. Slide 7 Submission Aiguo Yan (ZEKU)

8. November 2022 Doc.: IEEE 802.11-22/1869r0 Optimal SVD based BFing (11ax PER with the Channel-D) Submission Slide 8 Aiguo Yan (ZEKU)

9. November 2022 Doc.: IEEE 802.11-22/1869r0 Summary 1. Introduced essences of the Optimal SVD and its application to TXBFing 2. Shared performance simulation results of the Optimal SVD based TXBF. 3. There always exist Multiple Options on detailed implementations and/or standardizations. 4. Is further analyzing if and what kind of helps from standardization is required Submission Slide 9 Aiguo Yan (ZEKU)

10. November 2022 Doc.: IEEE 802.11-22/1869r0 Selected References 1. [WNG01]: 11-22-1413-01-0wng-thoughts-on-high-reliability-communications , [Aiguo Yan and et al of Zeku] 2. [WNG02]: 11-22-0708-03-0wng-beyond-be-next-step, [Rolf De Vegt and et al of Qualcomm] 3. [WNG03]: 11-22-0418-00-0wng-considerations-of-next-generation-beyond-11be (Jianhan Liu and et al of MediaTek). 4. [UHR01]: 11-22-1567-00-0uhr-c-ofdma-throughput-analysis-in-various-mesh-backhaul-scenarios.pptx (Sigurd Schelstraete and et al.) 5. [UHR02]: 11-22-1566-00-0uhr-views-on-uhr.pptx (Sigurd Schelstraete and et al.) 6. [TXBF01]: C. Shen and M. P. Fitz, "MIMO-OFDM Beamforming for Improved Channel Estimation," in IEEE Journal on Selected Areas in Communications, vol. 26, no. 6, pp. 948-959, August 2008, doi: 10.1109/JSAC.2008.080811. 7. [TXBF02]: W. Hu, F. Li and Y. Jiang, "Phase Rotations of SVD-Based Precoders in MIMO-OFDM for Improved Channel Estimation," in IEEE Wireless Communications Letters, vol. 10, no. 8, pp. 1805-1809, Aug. 2021, doi: 10.1109/LWC.2021.3081583. 8. [TXBF03]: E. Jeon, M. Ahn, S. Kim, W. B. Lee and J. Kim, "Joint Beamformer and Beamformee Design for Channel Smoothing in WLAN Systems," 2020 IEEE 92nd Vehicular Technology Conference (VTC2020-Fall), 2020, pp. 1-6, doi: 10.1109/VTC2020-Fall49728.2020.9348441. 9. [TXBF04] F. Jiang, Q. Li and X. Chen, "Channel Smoothing for 802.11ax Beamformed MIMO-OFDM," in IEEE Communications Letters, vol. 25, no. 10, pp. 3413-3417, Oct. 2021, doi: 10.1109/LCOMM.2021.3099167. 10.[TXBF05]: Yi Jiang, J. Li and W. W. Hager, "Joint transceiver design for MIMO communications using geometric mean decomposition," in IEEE Transactions on Signal Processing, vol. 53, no. 10, pp. 3791-3803, Oct. 2005, doi: 10.1109/TSP.2005.855398. Submission Slide 10 Aiguo Yan (ZEKU)

11. November 2022 Doc.: IEEE 802.11-22/1869r0 Backup Submission Slide 11 Aiguo Yan (ZEKU)

12. November 2022 Doc.: IEEE 802.11-22/1869r0 Importance of GMD based TXBFing 1. The idea of Unequal MCS (originally proposed in 802.11n) is gaining additional attention for the next gen standard. 2. GMD based TXBFing is an alternative to Unequal MCS technique. 3. The essence of the Optimal SVD based TXBFing can be extended to the Optimal GMD based TXBFing. Submission Slide 12 Aiguo Yan (ZEKU)

13. November 2022 Doc.: IEEE 802.11-22/1869r0 Optimal GMD Based TXBFing (hide standards-related details temporarily) = = = H H H U SV QRP = Optimal GMD: 1. GMD is not unique. 2. Choose a GMD that meets our pre-defined optimization criteria. H H U RV U RV NotationAbuse Preference: Smoothness of BFed Channel BF Feedback { ? ? } Raw Channel { ? ? } : ( ) Feedback V k BFer BFee : ( ) ( ) BFed Channel H k V k BFed Channel { ? ? ? ? } Submission Slide 13 Aiguo Yan (ZEKU)

14. November 2022 Doc.: IEEE 802.11-22/1869r0 Optimal GMD Based TXBF Feedback (hide standards-related details temporarily) = = = H H H U SV QRP = Optimal GMD: 1. GMD is not unique. 2. Choose a GMD that meets our pre-defined optimization criteria. H H U RV U RV NotationAbuse Preference: Smoothness of the Feedback BF Feedback { ? ? } Raw Channel { ? ? } : ( ) Feedback V k BFer BFee : ( ) ( ) BFed Channel H k V k BFed Channel { ? ? ? ? } Submission Slide 14 Aiguo Yan (ZEKU)