doc.: IEEE /0580 Submission 11ax Coding Discussions July, 2015 Slide 1 Date: Authors: NameAffiliationAddressPhone Hongyuan Zhang Marvell 5488 Marvell Lane, Santa Clara, CA, Yakun Sun Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Bo Yu Sudhir Srinivasa Saga Tamhane Mao Yu Edward Au Hui-Ling Lou Hongyuan Zhang, Marvell, et. al.

doc.: IEEE /0580 Submission July, 2015 Slide 2 Authors (continued) Hongyuan Zhang, Marvell, et. al. NameAffiliationAddressPhone Albert Van Zelst Qualcomm 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 Menzo Wentink Straatweg 66-S Breukelen, 3621 BR Netherlands Richard Van Nee Straatweg 66-S Breukelen, 3621 BR Netherlands Rolf De Vegt 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 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 /0580 Submission July, 2015 Slide 3 Authors (continued) Hongyuan Zhang, Marvell, et. al. NameAffiliationAddressPhone Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA Eldad Perahia Shahrnaz Azizi Po-Kai Huang Qinghua Li Xiaogang Chen Chitto Ghosh Laurent cariou Rongzhen Yang Ron Porat Broadcom Matthew Fischer Sriram Venkateswaran Andrew Blanksby Matthias Korb Tu Nguyen Vinko Erceg

doc.: IEEE /0580 Submission July, 2015 Slide 4 Authors (continued) Hongyuan Zhang, Marvell, et. al. 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 Russell Huang m Joonsuk Kim Apple Aon Mujtaba Guoqing Li Eric Wong Chris

doc.: IEEE /0580 Submission July, 2015 Slide 5 Authors (continued) Hongyuan Zhang, Marvell, et. al. NameAffiliationAddressPhone Phillip Barber Huawei The Lone Star State, TX ch.com Peter Loc 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 Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai

doc.: IEEE /0580 Submission May, 2015 Slide 6 Authors (continued) Hongyuan Zhang, Marvell, et. al. 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 NameAffiliationAddressPhone Hyeyoung Choi LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Kiseon Ryu Jinyoung Chun Jinsoo Choi Jeongki Kim Giwon Park Dongguk Lim Suhwook Kim Eunsung Park HanGyu Cho Thomas DerhamOrange

doc.: IEEE /0580 Submission July, 2015 Slide 7 Authors (continued) Hongyuan Zhang, Marvell, 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 Yusuke Asai Koichi Ishihara Akira Kishida Akira Yamada NTT DOCOMO 3-6, Hikarinooka, Yokosuka- shi, Kanagawa, , Japan Fujio Watanabe 3240 Hillview Ave, Palo Alto, CA com Haralabos Papadopoulos tions.com

doc.: IEEE /0580 Submission Background In 11a, 11n, 11ac, BCC is mandatory for all the PHY modes. In 11n and 11ac, LDPC is optional. LDPC obtains ~2dB sensitivity improvement over BCC. –Much larger gap for highest MCSs (e.g. MCS9) when BCC starts to floor due to RF and/or MIMO channel limitations. July, 2015 Hongyuan Zhang, Marvell, et. al.Slide 8

doc.: IEEE /0580 Submission 1. HE PHY Coding Discussions In 11ac products almost all WLAN chip vendors implemented LDPC. BCC will introduce ~4x of deinterleaver size in 1024FFT than in 11ac 256FFT (due to >4x N CBPS ), which is large. –Size of deinterleaver ≥ N CBPS *B LLR It does not make sense to have such an area increase but in reality one always use LDPC if all other STAs implemented LDPC. On the other hand, BCC may still be useful in narrower BWs and in preambles—in many cases save 1 symbol duration compared with LDPC. Propose that in 80MHz and 160MHz/80+80MHz RU sizes, LDPC is the only FEC scheme. –40MHz coding scheme is TBD. July, 2015 Hongyuan Zhang, Marvell, et. al.Slide 9

doc.: IEEE /0580 Submission Coding (Cont’d) Usage of BCC is mainly limited to low-end 11ax devices (e.g. 2.4GHz-only). With this rational, we would also prefer that BCC is defined only when Nss≤4. –Devices with >4 Antennas are definitely NOT “low-end”. –In these cases, prefer to define LDPC as the only coding scheme. May, 2015 Hongyuan Zhang, Marvell, et. al.Slide 10

doc.: IEEE /0580 Submission May, 2015 Hongyuan Zhang, Marvell, et. al.Slide MCS and LDPC Encoding Different from BCC, LDPC encoding has no restriction on integer N DBPS / N ES. Therefore, if LDPC is mandatory, 11ax should not have any MCS exclusion! For BCC, in all RU sizes ≤20MHz (i.e. 26, 52, 106, 242 tones), we did not find any MCS exclusion, when assuming 600Mbps per BCC_Encoder. For LDPC, when N DBPS is non-integer, LDPC Encoding parameter is slightly changed from 11ac, i.e. computing N DBPS as below

doc.: IEEE /0580 Submission Straw Poll #1 July, 2015 Slide 12Hongyuan Zhang, Marvell, et. al. Do you agree to add the following text into 11ax SFD? – “LDPC is the only coding scheme in the 11ax Data field for allocation sizes 996 tones and 996*2 tones.”

doc.: IEEE /0580 Submission Straw Poll #2 Do you agree to add the following text into 11ax SFD? –Support of BCC code is limited to less than or equal to four spatial streams (per user in case of MU-MIMO), and is mandatory (for both TX and RX) for RU sizes less than or equal to 242 tones (20MHz). –Support of LDPC code for both TX and RX is mandatory for HE STAs declaring support for at least one of HE 80/160/80+80 SU-PPDU bandwidths, or for HE STAs declaring support for more than 4 spatial streams. Otherwise, support of LDPC code for either TX or RX is optional. July, 2015 Hongyuan Zhang, Marvell, et. al.Slide 13

doc.: IEEE /0580 Submission Straw Poll #3 Do you agree to add the following text into 11ax SFD? –11ax MCS table shall not have any MCS exclusion, and when LDPC is applied, N DBPS is computed as follows July, 2015 Hongyuan Zhang, Marvell, et. al.Slide 14