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Doc.: IEEE 802.11-16/0034 Submission Beamforming with HE-LTF Compression Jan, 2016 Slide 1 Date: 2016-01-18 Authors: Hongyuan Zhang, Marvell, et. al.

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Presentation on theme: "Doc.: IEEE 802.11-16/0034 Submission Beamforming with HE-LTF Compression Jan, 2016 Slide 1 Date: 2016-01-18 Authors: Hongyuan Zhang, Marvell, et. al."— Presentation transcript:

1 doc.: IEEE 802.11-16/0034 Submission Beamforming with HE-LTF Compression Jan, 2016 Slide 1 Date: 2016-01-18 Authors: Hongyuan Zhang, Marvell, et. al.

2 doc.: IEEE 802.11-16/0034 Submission Slide 2 Authors (continued) Hongyuan Zhang, Marvell, et. al. Jan, 2016 NameAffiliationAddressPhoneEmail Ron Porat Broadcom rporat@broadcom.com Matthew Fischer mfischer@broadcom.com Sriram Venkateswaran Zhou Lan Leo Montreuil Andrew Blanksby Vinko Erceg Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA +1-503-724-893 robert.stacey@intel.com Eldad Perahia eldad.perahia@intel.com Shahrnaz Azizi shahrnaz.azizi@intel.com Po-Kai Huang po-kai.huang@intel.com Qinghua Li quinghua.li@intel.com Xiaogang Chen xiaogang.c.chen@intel.com Chitto Ghosh chittabrata.ghosh@intel.com Rongzhen Yang rongzhen.yang@intel.com Laurent cariou laurent.cariou@intel.com

3 doc.: IEEE 802.11-16/0034 Submission Slide 3 Authors (continued) Hongyuan Zhang, Marvell, et. al. Jan, 2016

4 doc.: IEEE 802.11-16/0034 Submission Slide 4 Authors (continued) Hongyuan Zhang, Marvell, et. al. Jan, 2016 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 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 Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 brianh@cisco.com Pooya Monajemi pmonajem@cisco.com Joonsuk Kim Apple joonsuk@apple.com Aon Mujtaba mujtaba@apple.com Guoqing Li guoqing_li@apple.com Eric Wong ericwong@apple.com Chris Hartman chartman@apple.com

5 doc.: IEEE 802.11-16/0034 Submission Slide 5 Authors (continued) Hongyuan Zhang, Marvell, et. al. Jan, 2016

6 doc.: IEEE 802.11-16/0034 Submission Slide 6 Authors (continued) Hongyuan Zhang, Marvell, et. al. Jan, 2016Bo Sun ZTE #9 Wuxing duan, Xifeng Rd, Xi’an, China SubSub.bo1@zte.com.cn Kaiying Lv lv.kaiying@zte.com.cn Yonggang Fang yfang@ztetx.com Ke Yao Yao.ke5@zte.com.cn Weimin Xing Xing.weimin@zte.com.cn

7 doc.: IEEE 802.11-16/0034 Submission Slide 7 Authors (continued) Hongyuan Zhang, Marvell, et. al. Jan, 2016

8 doc.: IEEE 802.11-16/0034 Submission Overview Jan, 2016 Hongyuan Zhang, Marvell, et. al.Slide 8 HE TxBF Feedback: assume we will reuse 11ac compressed FB format –Tone Grouping Ng: possible values 2, 4, 8, 16… In 11n/ac, smoothing is not recommended for BF pkt, because the V matrix or its compression may break the phase continuity across tones (e.g. singular vectors are right-rotational invariant). Now in 11ax, when 1x or 2x LTF is applied in steered BF packets, receiver has no choice but interpolate—a procedure similar to smoothing effect! –If Beamformer conducts steering arbitrarily tone-by-tone like 11n/ac, phase and/or amp continuity will be broken and 1x/2x LTF performs badly! This presentation discusses necessary approaches for the spec to ensure the interoperability for HE TxBF when 1x or 2x LTF is applied.

9 doc.: IEEE 802.11-16/0034 Submission Jan, 2016 Hongyuan Zhang, Marvell, et. al.Slide 9 Proposal If 1x or 2x HE-LTF is used in beamformed packets, prefer the beamformer also interpolate the Q matrix to guarantee the phase continuity! –This is necessary to be stressed by the spec to guarantee the interoperability!

10 doc.: IEEE 802.11-16/0034 Submission Jan, 2016 Hongyuan Zhang, Marvell, et. al.Slide 10 Simulation Setup HE 80MHz, 4x4, 3SS, MCS9. NDP uses 4x LTF—sound every tone. BF Data PPDU with 2xLTF: receiver conducts interpolation for channel estimation. Compression method: using angle quantization b_phi = 6, b_psi = 4.

11 doc.: IEEE 802.11-16/0034 Submission Jan, 2016 Hongyuan Zhang, Marvell, et. al.Slide 11 Ng=2, BFMer method comparison Method-1: Copy-paste adjacent Q. Method-2: Linearly interpolate adjacent Qs.

12 doc.: IEEE 802.11-16/0034 Submission Conclusions From result, it is essential for the beamformer to maintain the Q smoothness. Jan, 2016 Hongyuan Zhang, Marvell, et. al.Slide 12

13 doc.: IEEE 802.11-16/0034 Submission Straw Poll #1 Slide 13Hongyuan Zhang, Marvell, et. al. Do you agree to add the following text in SFD? –When 1x/2x HE-LTF is transmitted, it is recommended that the spatial mapping matrix applied to HE-STF and beyond is chosen such that it preserves the smoothness of the physical channel, achieved by limiting the variation of each element’s real and imaginary values in the spatial mapping matrix across successive tones. Jan, 2016

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