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Doc.: IEEE 802.11-15/0812r1 Submission Pilot Design for Data Section Slide 1 Date: 2015-07-13 Authors: Sameer Vermani (Qualcomm) NameCompanyAddressPhoneEmail.

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Presentation on theme: "Doc.: IEEE 802.11-15/0812r1 Submission Pilot Design for Data Section Slide 1 Date: 2015-07-13 Authors: Sameer Vermani (Qualcomm) NameCompanyAddressPhoneEmail."— Presentation transcript:

1 doc.: IEEE 802.11-15/0812r1 Submission Pilot Design for Data Section Slide 1 Date: 2015-07-13 Authors: Sameer Vermani (Qualcomm) NameCompanyAddressPhoneEmail Sameer VermaniQualcomm 5775 Morehouse Dr San Diego, CA svverman@qti.qualcomm.com Alice LiQualcomm Lin YangQualcomm Bin TianQualcomm Tao TianQualcomm Arjun BharadwajQualcomm Hemanth SampathQualcomm Richard Van NeeQualcomm Straatweg 66-S Breukelen, 3621 BR Netherlands Allert Van ZelstQualcomm Youhan KimQualcomm 1700 Technology Drive San Jose, CA 95110, USA VK JonesQualcomm

2 doc.: IEEE 802.11-15/0812r1 SubmissionSameer Vermani (Qualcomm)Slide 2 NameAffiliationAddressPhoneEmail Qinghua Li Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA +1-408-765-9698 quinghua.li@intel.com Xiaogang Chen xiaogang.c.chen@intel.com Robert Stacey robert.stacey@intel.com Po-Kai Huang po-kai.huang@intel.com Chitto Ghosh chittabrata.ghosh@intel.com Rongzhen Yang rongzhen.yang@intel.com Hongyuan Zhang Marvell 5488 Marvell Lane, Santa Clara, CA, 95054 +408-222-2500 hongyuan@marvell.com Yakun Sun yakunsun@marvell.com Lei Wang Leileiw@marvell.com Liwen Chu liwenchu@marvell.com Jinjing Jiang jinjing@marvell.com Yan Zhang yzhang@marvell.com Rui Cao ruicao@marvell.com Authors (continued)

3 doc.: IEEE 802.11-15/0812r1 Submission Slide 3 Authors (continued) NameAffiliationAddressPhoneEmail Sudhir Srinivasa Marvell (Cont’d) 5488 Marvell Lane, Santa Clara, CA, 95054 408-222-2500 sudhirs@marvell.com Saga Tamhane sagar@marvell.com Mao Yu my@marvel..com Edward Au edwardau@marvell.com Hui-Ling Lou hlou@marvell.com Ron Porat Broadcom rporat@broadcom.com Matthew Fischer mfischer@broadcom.com Sriram Venkateswaran Tu Nguyen Vinko Erceg Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 brianh@cisco.com Pooya Monajemi pmonajem@cisco.com Sameer Vermani (Qualcomm)

4 doc.: IEEE 802.11-15/0812r1 Submission Slide 4 Authors (continued) NameAffiliationAddressPhoneEmail Kiseon Ryu LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul 137- 130, Korea kiseon.ryu@lge.com Jinyoung Chun jiny.chun@lge.com Jinsoo Choi js.choi@lge.com Jeongki Kim jeongki.kim@lge.com 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 DerhamOrange thomas.derham@orange.com Sameer Vermani (Qualcomm)

5 doc.: IEEE 802.11-15/0812r1 Submission Slide 5 Authors (continued) NameAffiliationAddressPhoneEmail Fei Tong Samsung Innovation Park, Cambridge CB4 0DS (U.K.) +44 1223 434633 f.tong@samsung.com Hyunjeong Kang Maetan 3-dong; Yongtong-Gu Suwon; South Korea +82-31-279-9028 hyunjeong.kang@samsung.com Kaushik Josiam 1301, E. Lookout Dr, Richardson TX 75070 (972) 761 7437 k.josiam@samsung.com Mark Rison Innovation Park, Cambridge CB4 0DS (U.K.) +44 1223 434600 m.rison@samsung.com Rakesh Taori 1301, E. Lookout Dr, Richardson TX 75070 (972) 761 7470 rakesh.taori@samsung.com Sanghyun Chang Maetan 3-dong; Yongtong-Gu Suwon; South Korea +82-10-8864-1751 s29.chang@samsung.com Yasushi Takatori NTT 1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847 Japan takatori.yasushi@lab.ntt.co.jp Yasuhiko Inoue inoue.yasuhiko@lab.ntt.co.jp Yusuke Asai asai.yusuke@lab.ntt.co.jp Koichi Ishihara ishihara.koichi@lab.ntt.co.jp Akira Kishida kishida.akira@lab.ntt.co.jp Akira Yamada NTT DOCOMO 3-6, Hikarinooka, Yokosuka- shi, Kanagawa, 239-8536, Japan yamadaakira@nttdocomo.com Fujio Watanabe 3240 Hillview Ave, Palo Alto, CA 94304 watanabe@docomoinnovations. com Haralabos Papadopoulos hpapadopoulos@docomoinnova tions.com Sameer Vermani (Qualcomm)

6 doc.: IEEE 802.11-15/0812r1 Submission Slide 6 Authors (continued) NameAffiliationAddressPhoneEmail Phillip Barber Huawei The Lone Star State, TX pbarber@broadbandmobilete ch.com Peter Loc peterloc@iwirelesstech.com Le Liu F1-17, Huawei Base, Bantian, Shenzhen +86-18601656691 liule@huawei.com Jun Luo 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai jun.l@huawei.com Yi Luo F1-17, Huawei Base, Bantian, Shenzhen +86-18665891036 Roy.luoyi@huawei.com Yingpei Lin 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai linyingpei@huawei.com Jiyong Pang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai pangjiyong@huawei.com Zhigang Rong 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA zhigang.rong@huawei.com Rob Sun 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Rob.Sun@huawei.com David X. Yang F1-17, Huawei Base, Bantian, Shenzhen david.yangxun@huawei.com Yunsong Yang 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA yangyunsong@huawei.com Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen +86-18565826350 Lanzhou1@huawei.com Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Junghoon.Suh@huawei.com Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai +86-18601656691 zhangjiayin@huawei.com Sameer Vermani (Qualcomm)

7 doc.: IEEE 802.11-15/0812r1 Submission Slide 7 Authors (continued) NameAffiliationAddressPhoneEmail James Yee Mediatek No. 1 Dusing 1 st Road, Hsinchu, Taiwan +886-3-567-0766 james.yee@mediatek.com Alan Jauh alan.jauh@mediatek.com Chingwa Hu chinghwa.yu@mediatek.co m Frank Hsu frank.hsu@mediatek.com Thomas Pare Mediatek USA 2860 Junction Ave, San Jose, CA 95134, USA +1-408-526-1899 thomas.pare@mediatek.com ChaoChun Wang chaochun.wang@mediatek.c om James Wang james.wang@mediatek.com Jianhan Liu Jianhan.Liu@mediatek.com Tianyu Wu tianyu.wu@mediatek.com Russell Huang russell.huang@mediatek.co m Eric Wong Apple Cupertino, CA +1-408-9745967ericwong@apple.com Chris Hartman Aon Mujtaba Joonsuk Kim joonsuk@apple.com Guoqing Li+1-408-974-9164 guoqing_li@apple.com Sameer Vermani (Qualcomm)

8 doc.: IEEE 802.11-15/0812r1 Submission Slide 8 Authors (continued) NameAffiliationAddressPhoneEmail Weimin Xing ZTE Corp. Xing.weimin@zte.com.c n Kaiying Lvlv.kaiying@zte.com.cn Ke YaoYao.ke@zte.com.cn Bo SunSun.bo1@zte.com.cn Yonggang FangZTE TXyfang@ztetx.com Sameer Vermani (Qualcomm)

9 doc.: IEEE 802.11-15/0812r1 SubmissionSlide 9 Introduction In these slides, we try to reach consensus on high level pilot design for data section of 11ax PPDUs –Focus on key decision of choosing between following 2 designs: Single stream pilots (as used in 11ac) MIMO pilots (as used in 11n) Data section pilot design can be categorized into following cases –SU, DL OFDMA, UL OFDMA PPDUs Need to track only one phase on the assigned frequency resource –UL MU-MIMO PPDUs Need to track multiple phases (one per user) over the same frequency resource Based on analysis shown in these slides, propose transmission of single stream pilots in data section of all PPDUs in 11ax Sameer Vermani (Qualcomm)

10 doc.: IEEE 802.11-15/0812r1 Submission Pilots in 802.11: Historical Perspective Two kinds of pilot mappings exist in 802.11 standards –MIMO pilots Used in 11n, different stream uses different pilot sequence Orthogonal space-frequency and space-time mapping –More robust performance for highly correlated channels by providing diversity and avoiding undesired BF –Single stream pilots (SSP) Used in 11ac, different streams use exactly the same pilot sequence Used for both SU and DL MU-MIMO Sameer Vermani (Qualcomm)Slide 10

11 doc.: IEEE 802.11-15/0812r1 Submission Pilot design in 802.11ax For SU and DL/UL OFDMA, reusing 11ac single-stream pilots (SSP) becomes natural choice –Similar to 11ac, just one common phase offset needs to be tracked On the entire band (SU) or on each user’s frequency assignment (OFDMA) The key question is for UL MU MIMO: Do MIMO pilots bring any performance benefit? –In UL MU-MIMO, AP needs to do per user phase tracking and correction –If there is no performance benefit of MIMO pilots, adopt SSP Leads to unified pilot structure for all Tx modes Next 2 slides compare MIMO pilots vs SSP for UL MU-MIMO Slide 11Sameer Vermani (Qualcomm)

12 doc.: IEEE 802.11-15/0812r1 Submission Suitability of the two pilot options for 11ax UL MU-MIMO MIMO pilots –Similar to 11n, different streams would use different pilot sequence Pilot sequence decided based on stream index in the UL Space time and space frequency orthogonal mapping –Orthogonality provided in the MIMO pilots may not be that useful for UL MU-MIMO Space-frequency orthogonality to avoid undesired beamforming (over all pilot tones together) –Channels from different users/streams are most likely uncorrelated –Large timing offsets and CSDs further help destroy the flatness in fading, so undesired BF unlikely to happen on all pilot tones together Space-time orthogonality to get better diversity –Averaging over time is needed to use this for pilot tracking –Reduces phase tracking loop BW  admitting more phase noise Phase tracking loop BW situation is already exacerbated by 4x symbols Single stream pilots with same pilot sequence for every user –All streams/users transmit the same pilot sequence Similar to 802.11ac –Unifies pilot design with other modes –Need to check if phase tracking performance is comparable to MIMO pilots Slide 12Sameer Vermani (Qualcomm)

13 doc.: IEEE 802.11-15/0812r1 Submission Performance comparison of the two pilot options for UL MU-MIMO AP with 4 Rx antennas, 4 STAs with each having 1 Tx antenna transmitting 1 spatial stream each Two Scenarios –Independently located STAs –Co-located STAs Assign antennas of an SU-MIMO channel to a different users Channels –DNLoS channel –DLoS channel with Rician factor K_Rice_dB = [0, 6, 10]dB Impairments modeled –Non-linear PA –IQ imbalance –Phase noise (PN) –CFO: [-CFO -CFO +CFO +CFO]/2 for 4 STAs For all the scenarios listed above, we found negligible difference (<0.2 dB) in the performance of MIMO pilots and SSP – Tested MCS3 and MCS8 Slide 13Sameer Vermani (Qualcomm)

14 doc.: IEEE 802.11-15/0812r1 Submission Summary on pilot design Natural to use 802.11ac single stream pilots for SU and DL/UL OFDMA PPDUs –Just one phase to track like 802.11ac We found that even for UL MU-MIMO, the performance benefit of MIMO pilots over SSP is fairly minimal –Performance is very close even in co-located, highly correlated cases Recommend using Single stream pilots (as in 11ac) in data section for all transmission modes of 802.11ax –Unified pilot design across all modes –All streams transmit the same pilot sequence for UL MU-MIMO Slide 14Sameer Vermani (Qualcomm)

15 doc.: IEEE 802.11-15/0812r1 Submission Straw-poll 1 Do you agree to add the following text to the TGax spec framework document: “All 802.11ax PPDUs shall have single stream pilots in the data section All streams use the same pilot sequence even in UL MU-MIMO” –Y –N –A Sameer Vermani (Qualcomm)Slide 15

16 doc.: IEEE 802.11-15/0812r1 Submission Motion 1 Move to add the following text to the TGax spec framework document: “All 802.11ax PPDUs shall have single stream pilots in the data section All streams use the same pilot sequence even in UL MU-MIMO” –Y –N –A Sameer Vermani (Qualcomm)Slide 16

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