HE-LTF Sequence for UL MU-MIMO
This document presents the HE-LTF sequence for UL MU-MIMO as of May 2015. It includes details on authors, their affiliations, addresses, and contact information. The content covers a comprehensive overview of the research and development undertaken by various industry experts in the field of wireless communication standards, particularly focusing on IEEE 802.11-15. The document sheds light on the collaborative efforts of key players such as Intel, Marvell, LG Electronics, Samsung, NTT, Broadcom, Cisco Systems, and more.
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May, 2015 doc.: IEEE 802.11-15/0602r4 HE-LTF Sequence for UL MU-MIMO Date: 2015-06-02 Authors: Name Affiliation Address Phone Email Qinghua Li quinghua.li@intel.com Xiaogang Chen xiaogang.c.chen@intel.com 2111 NE 25th Ave, Hillsboro OR 97124, USA Robert Stacey robert.stacey@intel.com +1-408-765-9698 Intel Po-Kai Huang po-kai.huang@intel.com Chitto Ghosh chittabrata.ghosh@intel.com Rongzhen Yang rongzhen.yang@intel.com Hongyuan Zhang hongyuan@marvell.com Yakun Sun yakunsun@marvell.com Lei Wang Leileiw@marvell.com 5488 Marvell Lane, Santa Clara, CA, 95054 Liwen Chu Marvell +408-222-2500 liwenchu@marvell.com Jinjing Jiang jinjing@marvell.com Yan Zhang yzhang@marvell.com Rui Cao ruicao@marvell.com Submission Slide 1 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Authors (continued) Name Affiliation Address Phone Email Jie Huang jiehuang@marvell.com Sudhir Srinivasa sudhirs@marvell.com Saga Tamhane sagar@marvell.com Marvell (Cont d) 5488 Marvell Lane, Santa Clara, CA, 95054 408-222-2500 Mao Yu my@marvel..com Edward Au edwardau@marvell.com Hui-Ling Lou hlou@marvell.com Ron Porat rporat@broadcom.com Matthew Fischer Sriram Venkateswaran Tu Nguyen mfischer@broadcom.com Broadcom Vinko Erceg Brian Hart brianh@cisco.com 170 W Tasman Dr, San Jose, CA 95134 Cisco Systems Pooya Monajemi pmonajem@cisco.com Submission Qinghua Li, Xiaogang Chen, et al. Slide 2
May, 2015 doc.: IEEE 802.11-15/0602r4 Authors (continued) Name Affiliation Address Phone Email Wookbong Lee wookbong.lee@lge.com Kiseon Ryu kiseon.ryu@lge.com Jinyoung Chun jiny.chun@lge.com Jinsoo Choi js.choi@lge.com 19, Yangjae-daero 11gil, Seocho-gu, Seoul 137- 130, Korea Jeongki Kim jeongki.kim@lge.com LG Electronics Giwon Park giwon.park@lge.com Dongguk Lim dongguk.lim@lge.com Suhwook Kim suhwook.kim@lge.com Eunsung Park esung.park@lge.com HanGyu Cho hg.cho@lge.com Thomas Derham Orange thomas.derham@orange.com Submission Qinghua Li, Xiaogang Chen, et al. Slide 3
May, 2015 doc.: IEEE 802.11-15/0602r4 Authors (continued) Name Affiliation Address Innovation Park, Cambridge CB4 0DS (U.K.) Maetan 3-dong; Yongtong-Gu Suwon; South Korea 1301, E. Lookout Dr, Richardson TX 75070 Innovation Park, Cambridge CB4 0DS (U.K.) 1301, E. Lookout Dr, Richardson TX 75070 Maetan 3-dong; Yongtong-Gu Suwon; South Korea Phone Email Fei Tong f.tong@samsung.com +44 1223 434633 Hyunjeong Kang hyunjeong.kang@samsung.com +82-31-279-9028 Kaushik Josiam k.josiam@samsung.com (972) 761 7437 Samsung Mark Rison m.rison@samsung.com +44 1223 434600 Rakesh Taori rakesh.taori@samsung.com (972) 761 7470 Sanghyun Chang s29.chang@samsung.com +82-10-8864-1751 Yasushi Takatori takatori.yasushi@lab.ntt.co.jp Yasuhiko Inoue inoue.yasuhiko@lab.ntt.co.jp 1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847 Japan Yusuke Asai NTT asai.yusuke@lab.ntt.co.jp Koichi Ishihara ishihara.koichi@lab.ntt.co.jp Akira Kishida kishida.akira@lab.ntt.co.jp 3-6, Hikarinooka, Yokosuka- shi, Kanagawa, 239-8536, Japan Akira Yamada yamadaakira@nttdocomo.com watanabe@docomoinnovations. com hpapadopoulos@docomoinnova tions.com Fujio Watanabe NTT DOCOMO 3240 Hillview Ave, Palo Alto, CA 94304 Haralabos Papadopoulos Submission Qinghua Li, Xiaogang Chen, et al. Slide 4
May, 2015 doc.: IEEE 802.11-15/0602r4 Authors (continued) Name Affiliation Address Phone Email pbarber@broadbandmobilete ch.com peterloc@iwirelesstech.com Phillip Barber The Lone Star State, TX Peter Loc F1-17, Huawei Base, Bantian, Shenzhen 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai F1-17, Huawei Base, Bantian, Shenzhen 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada F1-17, Huawei Base, Bantian, Shenzhen 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA F1-17, Huawei Base, Bantian, SHenzhen 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Le Liu liule@huawei.com +86-18601656691 Jun Luo jun.l@huawei.com Yi Luo Roy.luoyi@huawei.com +86-18665891036 Yingpei Lin linyingpei@huawei.com Jiyong Pang pangjiyong@huawei.com Huawei Zhigang Rong zhigang.rong@huawei.com Rob Sun Rob.Sun@huawei.com David X. Yang david.yangxun@huawei.com Yunsong Yang yangyunsong@huawei.com Zhou Lan Lanzhou1@huawei.com +86-18565826350 Junghoon Suh Junghoon.Suh@huawei.com Jiayin Zhang zhangjiayin@huawei.com +86-18601656691 Submission Qinghua Li, Xiaogang Chen, et al. Slide 5
May, 2015 doc.: IEEE 802.11-15/0602r4 Authors (continued) Name Affiliation Address Phone Email Straatweg 66-S Breukelen, 3621 BR Netherlands 5775 Morehouse Dr. San Diego, CA, USA 5775 Morehouse Dr. San Diego, CA, USA 1700 Technology Drive San Jose, CA 95110, USA 5775 Morehouse Dr. San Diego, CA, USA 5775 Morehouse Dr. San Diego, CA, USA 5775 Morehouse Dr. San Diego, CA, USA Straatweg 66-S Breukelen, 3621 BR Netherlands Straatweg 66-S Breukelen, 3621 BR Netherlands 1700 Technology Drive San Jose, CA 95110, USA 5775 Morehouse Dr. San Diego, CA, USA 5775 Morehouse Dr. San Diego, CA, USA 1700 Technology Drive San Jose, CA 95110, USA 1700 Technology Drive San Jose, CA 95110, USA 1700 Technology Drive San Jose, CA 95110, USA Albert Van Zelst allert@qti.qualcomm.com Alfred Asterjadhi aasterja@qti.qualcomm.com Bin Tian btian@qti.qualcomm.com Carlos Aldana caldana@qca.qualcomm.com George Cherian gcherian@qti.qualcomm.com Gwendolyn Barriac gbarriac@qti.qualcomm.com Hemanth Sampath hsampath@qti.qualcomm.com Menzo Wentink Qualcomm mwentink@qti.qualcomm.com Richard Van Nee rvannee@qti.qualcomm.com Rolf De Vegt rolfv@qca.qualcomm.com Sameer Vermani svverman@qti.qualcomm.com Simone Merlin smerlin@qti.qualcomm.com Tevfik Yucek tyucek@qca.qualcomm.com VK Jones vkjones@qca.qualcomm.com Youhan Kim youhank@qca.qualcomm.com Submission Qinghua Li, Xiaogang Chen, et al. Slide 6
May, 2015 Authors (continued) doc.: IEEE 802.11-15/0602r4 Name Affiliation Address Phone Email No. 1 Dusing 1st Road, Hsinchu, Taiwan James Yee +886-3-567-0766 james.yee@mediatek.com Alan Jauh alan.jauh@mediatek.com chinghwa.yu@mediatek.co m frank.hsu@mediatek.com Mediatek Chingwa Hu Frank Hsu 2860 Junction Ave, San Jose, CA 95134, USA Thomas Pare +1-408-526-1899 thomas.pare@mediatek.com chaochun.wang@mediatek.c om james.wang@mediatek.com ChaoChun Wang James Wang Mediatek USA Jianhan Liu Jianhan.Liu@mediatek.com Tianyu Wu tianyu.wu@mediatek.com russell.huang@mediatek.co m ericwong@apple.com Russell Huang Eric Wong +1-408-9745967 Chris Hartman Cupertino, CA Aon Mujtaba Apple Joonsuk Kim joonsuk@apple.com Guoqing Li +1-408-974-9164 guoqing_li@apple.com Submission Qinghua Li, Xiaogang Chen, et al. Slide 7
May, 2015 Authors (continued) doc.: IEEE 802.11-15/0602r4 Name Affiliation Address Phone Email Weimin Xing Xing.weimin@zte.com.c n Kaiying Lv lv.kaiying@zte.com.cn ZTE Corp. Ke Yao Yao.ke@zte.com.cn Bo Sun Sun.bo1@zte.com.cn Yonggang Fang ZTE TX yfang@ztetx.com Submission Qinghua Li, Xiaogang Chen, et al. Slide 8
May, 2015 doc.: IEEE 802.11-15/0602r4 Background P matrix coded HE-LTF was adopted in last meeting [1] Maximize legacy reuse Adding details, we propose HE-LTF sequences for uplink multiuser MIMO Submission Slide 9 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Problem Statement In uplink multiuser MIMO, different UL users have different carrier frequency offsets AP may want to estimate the CFOs for demodulating data and mitigating multiuser interference For the CFO estimation, per-stream phase offsets at different LTF symbol instants need to be obtained Submission Slide 10 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Proposed Solution Assign orthogonal LTF sequences to different streams within the UL MU-MIMO burst Exploit frequency domain correlation Per-stream channel responses can be estimated for each LTF symbol CFO can be estimated by checking the phase difference between the channel estimates obtained at different LTF symbols Additional benefit No need to insert pilot tones in LTF symbols Submission Slide 11 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Generating LTF sequences Generated from P matrix Scramble a common sequence by different rows of P matrix Piecewise orthogonal Sub-sequences with any K (e.g. 4) contiguous entries are orthogonal Submission Slide 12 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Cyclic Orthogonality Orthogonal sequences of any length can be generated by exploiting cyclic orthogonality among P matrix rows E.g. 2 users with 26 tones and K=4 [1 -1] X X X User 1 L1 L2 L3 L4 L21 L22 L23 L24 L25 L26 [1 1] X X X User 2 L1 L2 L3 L4 L21 L22 L23 L24 L25 L26 orthogonal Qinghua Li, Xiaogang Chen, et al. Submission Slide 13
May, 2015 doc.: IEEE 802.11-15/0602r4 Orthogonal Tone Blocks By exploiting cyclic orthogonality, we have many orthogonal tone blocks generating data samples for CFO estimation User 1 S1(1) S1(2) S1(3) S1(4) S1(5) S1(6) S1(7) S1(8) S1(9) User 2 S2(1) S2(2) S2(3) S2(4) S2(5) S2(6) S2(7) S2(8) S2(9) Orthogonal tone block 1 Orthogonal tone block 2 Submission Qinghua Li, Xiaogang Chen, et al. Slide 14
May, 2015 doc.: IEEE 802.11-15/0602r4 LTF symbols of stream k Sequence common to all streams Stream index Si(k) Cj(k) ?? Tone index LTF symbol index Subcarrier 1 Subcarrier 2 Time LTF symbol 1 LTF symbol 2 Submission Slide 15 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 LTF symbols of multiple streams Orthogonal sequences are applied to different streams on each tone block Orthogonal sequences Submission Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 CFO Estimation Channel response remains roughly constant over each tone block Phase response is estimated from each tone block CFO is estimated by averaging the phase rotation rate over tone blocks and Rx antennas Orthogonal sequences Submission Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 One P matrix for all Since the 8 8 P matrix consists of orthogonal 2 2 and 4 4 sub-matrixes, we can use the rows of 8 8 P matrix to define LTF sequences for up to 8 streams ?8 8 = ?4 4 ?4 4 ?4 4 ?4 4 1 1 1 1 1 1 1 ?4 4 = 1 1 1 1 1 1 1 1 1 Submission Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Simulation Assumptions Uplink MU-MIMO 8 Rx antennas at AP, 4/6 STAs each sending 1 stream MCS7/MCS4; 20 MHz bandwidth; ChDNLoS/UMiNLoS CFO error is modeled as +CFO/-CFO with fixed value Timing offset is uniformly distributed over [0, Toff ns] for each STA CSD value follows 11ac & 11ax larger CSD(TBD) Per STA pilot tracking is enabled CFO is estimated and compensated for the proposed new LTF sequence Channel smoothing is not applied 4x/2x (3.2us/1.6us GI) LTF is used Submission Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 CFO Tolerance DNLoS; 8Rx@AP; 4STA; MCS7 100 10-1 3.5dB 0.15dB PER 10-2 10-3 Freqoff 0Hz/11ac LTF Freqoff 400Hz/new LTF Freqoff 400Hz/11ac LTF Freqoff 200Hz/new LTF Freqoff 200Hz/11ac LTF 10-4 20 21 22 23 24 25 26 27 28 29 30 SNR(dB) Tolerate +/- 400 Hz CFO within negligible degradation to ideal and >3 dB improvement over legacy Submission Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Timing Offset Tolerance DNLoS; 8Rx@AP; 4STA; MCS7 0 10 Freqoff 0Hz/11ac LTF Freqoff 400Hz/new LTF 0nsToff Freqoff 400Hz/11ac LTF 0nsToff Freqoff 400Hz/new LTF 1usToff Freqoff 400Hz/11ac LTF 1usToff 3 dB -1 10 Within 1 dB PER -2 10 -3 10 20 22 24 26 28 30 32 SNR(dB) Tolerate 1 s timing offset at 10% PER with sub-dB degradation to ideal and 3 dB improvement over legacy Submission Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Robust to Frequency Selectivity MCS4;UMiNLoS 0 10 Freqoff 0Hz/ 11ac LTF/0ns Toff Freqoff 400Hz/ new LTF/600ns Toff Freqoff 400Hz/ 11ac LTF/600ns Toff -1 10 PER -2 10 -3 10 14 15 16 17 18 19 20 21 22 SNR(dB) Work fine in outdoor channels Submission Slide 22 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 With per-stream CSD ChD; 6x8; CSD; MCS7 0 10 w/o CFO; w/o CSD 400Hz CFO; 11ac CSD [0 -400 -200 -600 -350 -650] 400Hz CFO; 11ax CSD [0 -800 -400 -1000 -600 -1200] -1 10 PER -2 10 -3 10 -4 10 28 29 30 31 32 33 34 SNR(dB) Work fine with CSD Submission Slide 23 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 2x LTF ChD 4STA 2x 100 Freqoff 0Hz/ 11ac LTF Freqoff 400Hz/ new LTF Freqoff 400Hz/ 11ac LTF 10-1 PER 2dB 10-2 10-3 20 22 24 26 28 30 32 SNR(dB) Work fine with 2x LTFs Submission Slide 24 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 UL transmission with beamforming 4STAs(2Tx->8Rx); ChD; MCS7 0 10 2Tx BF w/o CFO 2Tx BF CFO 400Hz -1 10 PER 0.3 dB 20MHz channel STA: 2 Tx ant. with ideal beamforming AP: 8 Rx ant. 4 STAs -2 10 -3 10 20 21 22 23 24 25 26 SNR(dB) Work fine in the presence of phase discontinuity due to UL beamforming Submission Slide 25 Qinghua Li, Xiaogang Chen, et. al.
May, 2015 doc.: IEEE 802.11-15/0602r4 UL transmission with power offset 6STAs; 8Rx@AP; ChD MCS7 0 10 -10dB w/o CFO -10dB CFO 400Hz -6dB w/o CFO -6dB CFO 400Hz -1 10 PER STA: 1 Tx ant. AP: 8 Rx ant. 4 STAs received with 0dB power 1 STA received with - 10dB power 1 STA received with - 6dB power 0.2 dB -2 10 0.2 dB -3 10 26 27 28 29 30 31 32 33 34 35 SNR(dB) Works well with power imbalance Submission Slide 26 Qinghua Li, Xiaogang Chen, et. al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Summary UL MU-MIMO CFO estimation is enabled by assigning orthogonal LTF sequences to different streams Optimal performance Maximum reuse of legacy design Low complexity Propose to use the rows of 8 8 P matrix as the masking sequences for generating the orthogonal HE-LTF sequences for UL MU-MIMO Submission Slide 27 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Reference [1] Specification Framework for TGax, doc.: IEEE 802.11-15/0132r4, Section 3.2, March 2015 Submission Slide 28 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Straw Poll Do you agree to add to TGax Specification Framework Document? The HE-LTF sequences for UL MU-MIMO shall be generated as follows. For each stream, a common sequence shall be masked repeatedly in a piece-wise manner by a distinct row of the 8x8 P matrix. When the length of the LTF sequence is not divisible by 8, the last M elements of the LTF sequence (M being the remainder after the division of LTF length by 8) shall be masked by the first M elements of the P matrix row. Yes No Abstain Submission Slide 29 Qinghua Li, Xiaogang Chen, et al.
May, 2015 doc.: IEEE 802.11-15/0602r4 Backup Submission Slide 30 Qinghua Li, Xiaogang Chen, et al.
