doc.: IEEE /0089r1 Submission Single Stream Pilots in UL MU MIMO January, 2016 Slide 1 Date: Authors: Ron Porat, Broadcom, et. al. NameAffiliation AddressPhone Ron Porat Broadcom Feng Jiang Sriram Venkateswaran Matthew Fischer Mingyue Ji Leo Montreuil Andrew Blanksby Vinko Erceg

doc.: IEEE /0089r1 Submission January, 2016 Slide 2 Authors (continued) Ron Porat, Broadcom, et. al. Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA Shahrnaz Azizi Po-Kai Huang Qinghua Li Xiaogang Chen Chitto Ghosh Laurent Cariou Yaron Alpert Assaf Gurevitz Ilan Sutskover

doc.: IEEE /0089r1 Submission January, 2016 Slide 3 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Hongyuan Zhang Marvell 5488 Marvell Lane, Santa Clara, CA, Yakun Sun Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Sudhir Srinivasa Bo Yu Saga Tamhane Mao Yu Xiayu Zheng Christian Berger Niranjan Grandhe Hui-Ling Lou

doc.: IEEE /0089r1 Submission January, 2016 Slide 4 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Alice Chen Qualcomm 5775 Morehouse Dr. San Diego, CA, USA Albert Van Zelst Straatweg 66-S Breukelen, 3621 BR Netherlands Alfred Asterjadhi 5775 Morehouse Dr. San Diego, CA, USA Arjun Bharadwaj 5775 Morehouse Dr. San Diego, CA, USA Bin Tian 5775 Morehouse Dr. San Diego, CA, USA Carlos Aldana 1700 Technology Drive San Jose, CA 95110, USA George Cherian 5775 Morehouse Dr. San Diego, CA, USA Gwendolyn Barriac 5775 Morehouse Dr. San Diego, CA, USA Hemanth Sampath 5775 Morehouse Dr. San Diego, CA, USA Lin Yang 5775 Morehouse Dr. San Diego, CA, USA Menzo Wentink Straatweg 66-S Breukelen, 3621 BR Netherlands Naveen Kakani 2100 Lakeside Boulevard Suite 475, Richardson TX 75082, USA Raja Banerjea 1060 Rincon Circle San Jose CA 95131, USA Richard Van Nee Straatweg 66-S Breukelen, 3621 BR Netherlands

doc.: IEEE /0089r1 Submission January, 2016 Slide 5 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Rolf De Vegt Qualcomm 1700 Technology Drive San Jose, CA 95110, USA Sameer Vermani 5775 Morehouse Dr. San Diego, CA, USA Simone Merlin 5775 Morehouse Dr. San Diego, CA, USA Tao Tian 5775 Morehouse Dr. San Diego, CA, USA Tevfik Yucek 1700 Technology Drive San Jose, CA 95110, USA VK Jones 1700 Technology Drive San Jose, CA 95110, USA Youhan Kim 1700 Technology Drive San Jose, CA 95110, USA

doc.: IEEE /0089r1 Submission January, 2016 Slide 6 Authors (continued) Ron Porat, Broadcom, et. al. Joonsuk Kim Apple Aon Mujtaba Guoqing Li Eric Wong Chris NameAffiliationAddressPhone James Yee Mediatek No. 1 Dusing 1 st Road, Hsinchu, Taiwan Alan Jauh Chingwa Hu m Frank Hsu Thomas Pare Mediatek USA 2860 Junction Ave, San Jose, CA 95134, USA ChaoChun Wang om James Wang Jianhan Liu Tianyu Wu Zhou Lan Russell Huang m

doc.: IEEE /0089r1 Submission January, 2016 Slide 7 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Peter Loc Huawei Le Liu F1-17, Huawei Base, Bantian, Shenzhen Jun Luo 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Yi Luo F1-17, Huawei Base, Bantian, Shenzhen Yingpei Lin 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Jiyong Pang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Zhigang Rong Telesis Court, Suite 365, San Diego, CA NA Rob Sun 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada David X. Yang F1-17, Huawei Base, Bantian, Shenzhen Yunsong Yang Telesis Court, Suite 365, San Diego, CA NA Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Edward Au 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Teyan Chen F1-17, Huawei Base, Bantian, Shenzhen Yunbo Li F1-17, Huawei Base, Bantian, Shenzhen

doc.: IEEE /0089r1 Submission January, 2016 Slide 8 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Jinmin Kim LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Kiseon Ryu Jinyoung Chun Jinsoo Choi Jeongki Kim Dongguk Lim Suhwook Kim Eunsung Park JayH Park HanGyu Cho Thomas DerhamOrange Bo Sun ZTE #9 Wuxingduan, Xifeng Rd., Xi'an, China Kaiying Lv Yonggang Fang Ke Yao Weimin Xing Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA Pooya Monajemi

doc.: IEEE /0089r1 Submission January, 2016 Slide 9 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Fei Tong Samsung Innovation Park, Cambridge CB4 0DS (U.K.) Hyunjeong Kang Maetan 3-dong; Yongtong-Gu Suwon; South Korea Kaushik Josiam 1301, E. Lookout Dr, Richardson TX (972) Mark Rison Innovation Park, Cambridge CB4 0DS (U.K.) Rakesh Taori 1301, E. Lookout Dr, Richardson TX (972) Sanghyun Chang Maetan 3-dong; Yongtong-Gu Suwon; South Korea Yasushi Takatori NTT 1-1 Hikari-no-oka, Yokosuka, Kanagawa Japan Yasuhiko Inoue Shoko Shinohara Yusuke Asai Koichi Ishihara Junichi Iwatani Akira YamadaNTT DOCOMO 3-6, Hikarinooka, Yokosuka- shi, Kanagawa, , Japan

doc.: IEEE /0089r1 Submission January, 2016 Slide 10 Authors (continued) Ron Porat, Broadcom, et. al. NameAffiliationAddressPhone Masahito Mori Sony Corp. Yusuke Yuichi Kazuyuki William

doc.: IEEE /0089r1 Submission Introduction The current SFD supports single stream pilots for SU, DL/UL OFDMA and DL MU-MIMO transmissions In this contribution we investigate the performance of single stream pilots for UL MU-MIMO, show that it performs well and propose to add support for this option January, 2016 Slide 11Ron Porat, Broadcom, et. al.

doc.: IEEE /0089r1 Submission Proposal Support single stream pilots in UL MU MIMO transmissions also –Apply pilot modulation during HE-LTF exactly as in UL MU-MIMO payload –Same implementation at the STA –Same implementation at the AP for UL MU-MIMO LTF and payload CFO Estimation high level –Step 1: Estimate channel on pilot tones On each pilot, interpolate channel estimates from neighboring tones –Step 2: Use channel estimate on pilots to estimate the phases on two HE-LTF symbols. Difference in phases is an estimate of the CFO. –More details in appendix AP uses 1 bit in the trigger frame to indicate its preference between single stream pilots and orthogonal masking sequences for CFO estimation –No additional implementation burden at STA over today: spec framework mandates transmission of both masking sequences (for UL MU) and single stream pilots (for SU, DL/UL OFDMA, DL MU MIMO) January, 2016 Slide 12Ron Porat, Broadcom, et. al.

doc.: IEEE /0089r1 Submission Simulation scenario January, 2016 Slide 13Ron Porat, Broadcom, et. al. AP: 8 antennas STA: 6 STAs with CFO = ± 400 Hz Channel:11nD Timing offset: uniformly from [0, 800] ns CSD:[ ] ns RF Impairments LTFs: 2X & 4X MCS: 7 & 9

doc.: IEEE /0089r1 Submission Results: 2X LTF January, 2016 Slide 14Ron Porat, Broadcom, et. al. Correction with single stream pilots is very close to the ideal case of zero CFO

doc.: IEEE /0089r1 Submission Results: 4X LTF January, 2016 Slide 15Ron Porat, Broadcom, et. al. Correction with single stream pilots is very close to the ideal case of zero CFO

doc.: IEEE /0089r1 Submission Conclusion Propose to add single stream pilots in UL MU MIMO transmissions –STA already supports single stream pilots –Performs well in challenging scenarios –AP uses 1 bit in the trigger frame to indicate its preference between single stream pilots and orthogonal masking sequences for CFO estimation –No additional implementation burden relative to today STA needs to transmit masking sequences on LTFs (UL MU) and pilots (for SU, DL/UL OFDMA, DL MU) AP needs to handle single stream pilots even in UL MU during payload decoding January, 2016 Slide 16Ron Porat, Broadcom, et. al.

doc.: IEEE /0089r1 Submission SP #1 Do you support the following change/additions to the SFD: For UL MU MIMO transmissions, support of single stream pilots and masking the LTF sequence of each spatial stream by a distinct orthogonal code is mandatory at the transmitter side (non AP STA). The trigger frame shall use 1 bit to indicate whether the UL MU MIMO transmission following it uses single stream pilots or a mask on each spatial stream of the LTF sequence by a distinct orthogonal code. Yes No Abs January, 2016 Slide 17Ron Porat, Broadcom, et al.

doc.: IEEE /0089r1 Submission Appendix 1: Algorithm January, 2016 Slide 18Ron Porat, Broadcom, et al.

doc.: IEEE /0089r1 Submission Appendix 1: Algorithm January, 2016 Slide 19Ron Porat, Broadcom, et al.