May 2015 doc IEEE 802 11 150579 802

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May, 2015 doc. : IEEE 802. 11 -15/0579 802. 11 ax Preamble Design and

May, 2015 doc. : IEEE 802. 11 -15/0579 802. 11 ax Preamble Design and Auto-detection Date: 2015 -05 -10 Authors: Name Affiliation Address Phone Email Hongyuan Zhang [email protected] com Yakun Sun [email protected] com Lei Wang [email protected] com Liwen Chu [email protected] com Jinjing Jiang [email protected] com Yan Zhang Rui Cao Jie Huang Marvell 5488 Marvell Lane, Santa Clara, CA, 95054 Sudhir Srinivasa 408 -222 -2500 [email protected] com [email protected] com [email protected] com Saga Tamhane [email protected] com Mao Yu [email protected] . com Edward Au [email protected] com Hui-Ling Lou Submission [email protected] com [email protected] com Slide 1 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Qualcomm

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Qualcomm Straatweg 66 -S Breukelen, 3621 BR Netherlands 5775 Morehouse Dr. San Diego, CA, USA 1700 Technology Drive San Jose, CA 95110, USA 5775 Morehouse Dr. San Diego, CA, USA Straatweg 66 -S Breukelen, 3621 BR Netherlands 1700 Technology Drive San Jose, CA 95110, USA 5775 Morehouse Dr. San Diego, CA, USA 1700 Technology Drive San Jose, CA 95110, USA Albert Van Zelst Alfred Asterjadhi Bin Tian Carlos Aldana George Cherian Gwendolyn Barriac Hemanth Sampath Menzo Wentink Richard Van Nee Rolf De Vegt Sameer Vermani Simone Merlin Tevfik Yucek VK Jones Youhan Kim Submission Slide 2 Phone Email [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com [email protected] qualcomm. com Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Phone

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Phone Email Robert Stacey robert. [email protected] com Eldad Perahia eldad. [email protected] com Shahrnaz Azizi shahrnaz. [email protected] com Po-Kai Huang Qinghua Li Intel Xiaogang Chen 2111 NE 25 th Ave, Hillsboro OR 97124, USA po-kai. [email protected] com +1 -503 -724 -893 quinghua. [email protected] com xiaogang. c. [email protected] com Chitto Ghosh chittabrata. [email protected] com Laurent cariou laurent. [email protected] com Rongzhen Yang rongzhen. [email protected] com Ron Porat [email protected] com Matthew Fischer [email protected] com Sriram Venkateswaran Broadcom Tu Nguyen Vinko Erceg Submission Slide 3 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Phone

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Phone Email No. 1 Dusing 1 st Road, Hsinchu, Taiwan +886 -3 -567 -0766 james. [email protected] com alan. [email protected] com Chingwa Hu chinghwa. [email protected] co m Frank Hsu frank. [email protected] com James Yee Alan Jauh Mediatek 2860 Junction Ave, San +1 -408 -526 -1899 Jose, CA 95134, USA Thomas Pare Chao. Chun Wang James Wang Jianhan Liu Mediatek USA chaochun. [email protected] c om james. [email protected] com Jianhan. [email protected] com Tianyu Wu tianyu. [email protected] com Russell Huang Joonsuk Kim russell. [email protected] co m [email protected] com Aon Mujtaba Guoqing Li Eric Wong [email protected] com Apple [email protected] com [email protected] com Chris Hartman Submission thomas. [email protected] com [email protected] com Slide 4 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Phone

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Address Phone Email Phillip Barber The Lone Star State, TX [email protected] ch. com Peter Loc [email protected] com Le Liu F 1 -17, Huawei Base, Bantian, Shenzhen 5 B-N 8, No. 2222 Xinjinqiao Road, Pudong, Shanghai 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada F 1 -17, Huawei Base, Bantian, Shenzhen 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA F 1 -17, Huawei Base, Bantian, SHenzhen 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada 5 B-N 8, No. 2222 Xinjinqiao Road, Pudong, Shanghai +86 -18601656691 [email protected] com jun. [email protected] com +86 -18665891036 Roy. [email protected] com [email protected] com [email protected] com zhigang. [email protected] com Rob. [email protected] com david. [email protected] com [email protected] com +86 -18565826350 Lanzhou [email protected] com Junghoon. [email protected] com +86 -18601656691 [email protected] com Jun Luo Yingpei Lin Jiyong Pang Zhigang Rob Sun David X. Yang Yunsong Yang Zhou Lan Junghoon Suh Jiayin Zhang Submission Huawei Slide 5 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Phone Email Wookbong

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Phone Email Wookbong Lee wookbong. [email protected] com Kiseon Ryu kiseon. [email protected] com Jinyoung Chun jiny. [email protected] com Jinsoo Choi js. [email protected] com jeongki. [email protected] com giwon. [email protected] com Dongguk Lim dongguk. [email protected] com Suhwook Kim suhwook. [email protected] com Eunsung Park esung. [email protected] com Han. Gyu Cho hg. [email protected] com thomas. [email protected] com sun. bo [email protected] com. cn lv. [email protected] com. cn [email protected] com yao. ke [email protected] com. cn xing. [email protected] com. cn [email protected] com [email protected] com Jeongki Kim Giwon Park Thomas Derham Affiliation LG Electronics Submission 19, Yangjae-daero 11 gil, Seocho-gu, Seoul 137130, Korea Orange ZTE #9 Wuxingduan, Xifeng Rd. , Xi'an, China Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 Bo Sun Kaiying Lv Yonggang Fang Ke Yao Weimin Xing Brian Hart Pooya Monajemi Address Slide 6 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Phone Email

May, 2015 doc. : IEEE 802. 11 -15/0579 Authors (continued) Name Affiliation Phone Email +44 1223 434633 f. [email protected] com +82 -31 -279 -9028 hyunjeong. [email protected] com (972) 761 7437 k. [email protected] com +44 1223 434600 m. [email protected] com (972) 761 7470 rakesh. [email protected] com +82 -10 -8864 -1751 s 29. [email protected] com Yasushi Takatori takatori. [email protected] ntt. co. jp Yasuhiko Inoue inoue. [email protected] ntt. co. jp asai. [email protected] ntt. co. jp Koichi Ishihara ishihara. [email protected] ntt. co. jp Akira Kishida kishida. [email protected] ntt. co. jp [email protected] com Fei Tong Hyunjeong Kaushik Josiam Mark Rison Samsung Rakesh Taori Sanghyun Chang Yusuke Asai NTT Haralabos Papadopoulos Submission Innovation Park, Cambridge CB 4 0 DS (U. K. ) Maetan 3 -dong; Yongtong-Gu Suwon; South Korea 1301, E. Lookout Dr, Richardson TX 75070 Innovation Park, Cambridge CB 4 0 DS (U. K. ) 1301, E. Lookout Dr, Richardson TX 75070 Maetan 3 -dong; Yongtong-Gu Suwon; South Korea 1 -1 Hikari-no-oka, Yokosuka, Kanagawa 239 -0847 Japan 3 -6, Hikarinooka, Yokosuka-shi, Kanagawa, 239 -8536, Japan Akira Yamada Fujio Watanabe Address NTT DOCOMO 3240 Hillview Ave, Palo Alto, CA 94304 Slide 7 [email protected] com [email protected] ions. com Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Introduction • Background – Based 802.

May, 2015 doc. : IEEE 802. 11 -15/0579 Introduction • Background – Based 802. 11 ax SFD [1]: • An HE PPDU shall include the legacy preamble (L-STF, L-LTF and L-SIG), duplicated on each 20 MHz, for backward compatibility with legacy devices. • HE-SIG-A and HE-SIG-B fields are included LSTF 8 us LLTF 8 us LSIG 4 us Legacy Preamble HE Data Payload (4 x Symbol Duration (GI+12. 8 us) HE-Preamble • Highlights of this contribution – Focus on the 11 ax packet autodetection design; – Propose an LSIG repetition based 11 ax packet autodetection scheme. Submission Slide 8 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Desired Attributes of 11 ax Preamble

May, 2015 doc. : IEEE 802. 11 -15/0579 Desired Attributes of 11 ax Preamble Design for 11 ax Packet Autodetection • Robust autodetection: – Backward compatible, allowing legacy spoofing – High reliability in – Dense deployments with high interference – All 11 ax channels of interests, including outdoor UMI channels. – Very low false triggers • Early autodetection: – Differentiate from 11 a/n/ac packets as early as possible, to reduce the number of different hypotheses at the receiver. • Simple and unified design Submission Slide 9 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Existing 802. 11 OFDM Packet Classifications

May, 2015 doc. : IEEE 802. 11 -15/0579 Existing 802. 11 OFDM Packet Classifications Auto-detection based on QBPSK Detection BPSK QBPSK 11 a LSTF LLTF LSIG (8 usec) (4 usec) 11 n-MM LSTF LLTF LSIG (8 usec) (4 usec) HTSIG 1 HTSIG 2 11 n-GF HT-STF HT-LTF 1 (8 usec) HTSIG 1 HTSIG 2 … 11 ac LSTF LLTF LSIG (8 usec) (4 usec) VHT- VHTSIGA 1 SIGA 2 11 ax LSTF LLTF LSIG (8 usec) (4 usec) Submission Data … … ? Slide 10 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Proposed 11 ax Packet Format •

May, 2015 doc. : IEEE 802. 11 -15/0579 Proposed 11 ax Packet Format • Use LSIG repetition for 11 ax packet autodetection, i. e, – Having a 4 us symbol repeating the LSIG content, in the 11 ax preamble right after the legacy section – Modulating the R-LSIG (LSIG repetition ) symbol with BPSK and rate ½ BCC. – The next symbol (HE-SIGA) after RLSIG is also BPSK, legacy devices will detect the packet as 11 a/g. Discussed in separate contributions BPSK GI=0. 8 us L-STF 8 us L-LTF 8 us L-SIG 4 us Legacy Preamble Submission R-LSIG 4 us BPSK HESIGA HE-SIGB (DL) HESTF HE-LTFs ……. . HE-Preamble Slide 11 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Example of Detection Procedure at Rx

May, 2015 doc. : IEEE 802. 11 -15/0579 Example of Detection Procedure at Rx • Step-1: LSIG and RLSIG repetition detection. • Step-2: LSIG and RLSIG MRC, and demodulate/decode. • Step-3: Content Check: e. g. Parity bit, Rate=6 Mbps and LLENGTH!=3 x. • When both steps 1 and 3 passes, 11 ax is detected, otherwise jump back to 11 a/n/ac state machine. • Note that steps 2 and 3 are required as part of the packet decoding anyways (similar to 11 ac)! Submission Slide 12 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Illustration of the achieved Early 11

May, 2015 doc. : IEEE 802. 11 -15/0579 Illustration of the achieved Early 11 ax Detection • Early 11 ax detection • LSIG Rep detection + LSIG Content check finishes approx at 3 us after end of R-LSIG • Before the potential (V)HT-STF field in 11 n/ac • No need to revise the old 11 a/n/ac detection state-machine. • In the case of repetition false trigger, receiver may still fall back to conventional 11 n/ac state-machine on time (for AGC). Submission Slide 13 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Other Benefits • Reliable detection performance:

May, 2015 doc. : IEEE 802. 11 -15/0579 Other Benefits • Reliable detection performance: miss detection is lower than the error rate of combined LSIG+RLSIG field, and with very low false detection probability. – Refer to the simulation results in subsequent slides. • Improve LSIG field error rate: therefore beneficial for the following cases – Outdoor (UMI channel). – High density low SINR. • Reduce the chance of collision (more reliable CCA determination), therefore reducing the extra overhead caused by re-transmissions. – Reducing LSIG false positive probability at 11 ax receivers. – Enabling possible range extension. Submission Slide 14 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 On Detection Algorithm • It is

May, 2015 doc. : IEEE 802. 11 -15/0579 On Detection Algorithm • It is recommended to conduct the repetition detection in frequency domain (post FFT). – For better performance. • There are multiple ways of frequency domain repetition detection, some of which are simple and get reliable miss and false detection performances. – Refer to simulation results. • The LSIG content check (after combining) happens right after the repetition check, therefore serves as an additional checksum. Submission Slide 15 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Simulation Setup • 20 MHz. •

May, 2015 doc. : IEEE 802. 11 -15/0579 Simulation Setup • 20 MHz. • 1/2/4 Tx, and 1 Rx antennas • UMi-NLOS, and DNLOS channels – Ensemble normalized • CSD values per Antenna (2/4 Tx) – [0, -50, -100, -150]ns as 11 ac – Or [0, -50, -100, -150]*2 ns • Actual 40 ppm CFO and phase/CFO tracking • Actual timing. Submission Slide 16 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 1 x 1, UMI Submission Slide

May, 2015 doc. : IEEE 802. 11 -15/0579 1 x 1, UMI Submission Slide 17 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 1 x 1 DNLOS Submission Slide

May, 2015 doc. : IEEE 802. 11 -15/0579 1 x 1 DNLOS Submission Slide 18 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 2 x 1, UMI • No

May, 2015 doc. : IEEE 802. 11 -15/0579 2 x 1, UMI • No false trigger happens for 2 Tx + 11 ac per-antenna CSD. • 11 ac per-ant CSD values works fine for 2 Tx. Submission Slide 19 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 2 x 1 DNLOS (Pfalse =

May, 2015 doc. : IEEE 802. 11 -15/0579 2 x 1 DNLOS (Pfalse = 0) Submission Slide 20 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 4 x 1 UMI 11 ac

May, 2015 doc. : IEEE 802. 11 -15/0579 4 x 1 UMI 11 ac per-antenna CSD Value 2 x 11 ac per-antenna CSD Value • 2 x CSD values improves detection and decoding performances. • Miss and False triggering probability are still very low for both CSD values. Submission Slide 21 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Conclusions • We propose to repeat

May, 2015 doc. : IEEE 802. 11 -15/0579 Conclusions • We propose to repeat LSIG field and use it as the 11 ax autodetection mechanism. • By simulations, this method shows reliable miss detection and false detection performances in both indoor and outdoor channels. • It realizes early 11 ax detection, enabling simple and clean receiver design state-machine. • It improves the LSIG performance for outdoor and highly dense deployments. Submission Slide 22 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Straw Poll #1 Do you support

May, 2015 doc. : IEEE 802. 11 -15/0579 Straw Poll #1 Do you support having a 4 us symbol repeating the L-SIG content, in the 11 ax preamble right after the legacy section? – This symbol shall be modulated by BPSK and rate ½ BCC. … Submission BPSK GI=0. 8 us LSIG R- LSIG HE-SIGA Symbols Slide 23 … Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 Straw Poll #2 • Do you

May, 2015 doc. : IEEE 802. 11 -15/0579 Straw Poll #2 • Do you agree that in an HE PPDU, both the first and second OFDM symbols immediately following the L-SIG shall use BPSK modulation. – NOTE–This is to spoof all legacy (11 a/n/ac) devices to treat an HE PPDU as a non-HT PPDU. Submission Slide 24 Hongyuan Zhang, Marvell, et. al.

May, 2015 doc. : IEEE 802. 11 -15/0579 References [1] 11 -15 -0132 -02

May, 2015 doc. : IEEE 802. 11 -15/0579 References [1] 11 -15 -0132 -02 -00 ax-spec-framework Submission Slide 25 Hongyuan Zhang, Marvell, et. al.