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Power Scaling of L-LTF and L-STF
Month Year doc.: IEEE yy/xxxxr0 March, 2016 Power Scaling of L-LTF and L-STF Date: Authors: Name Affiliation Address Phone Yakun Sun Marvell 5488 Marvell Lane, Santa Clara, CA, 95054 Hongyuan Zhang Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Sudhir Srinivasa Bo Yu Saga Tamhane Mao Yu Xiayu Zheng Christian Berger Niranjan Grandhe Hui-Ling Lou Yakun Sun, et. al. (Marvell) Hongyuan Zhang, Marvell; etc.
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2111 NE 25th Ave, Hillsboro OR 97124, USA
March, 2016 Authors (continued) Name Affiliation Address Phone Ron Porat Broadcom Sriram Venkateswaran Matthew Fischer Zhou Lan Leo Montreuil Andrew Blanksby Vinko Erceg Mingyue Ji Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA Shahrnaz Azizi Po-Kai Huang Qinghua Li Xiaogang Chen Chitto Ghosh Laurent Cariou Yaron Alpert Assaf Gurevitz Ilan Sutskover Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 Alice Chen Albert Van Zelst
Name Affiliation Address Phone Alice Chen Qualcomm 5775 Morehouse Dr. San Diego, CA, USA Albert Van Zelst Straatweg 66-S Breukelen, 3621 BR Netherlands Alfred Asterjadhi Arjun Bharadwaj Bin Tian Carlos Aldana 1700 Technology Drive San Jose, CA 95110, USA George Cherian Gwendolyn Barriac Hemanth Sampath Lin Yang Menzo Wentink Naveen Kakani 2100 Lakeside Boulevard Suite 475, Richardson TX 75082, USA Raja Banerjea 1060 Rincon Circle San Jose CA 95131, USA Richard Van Nee Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 Rolf De Vegt Sameer Vermani Qualcomm
Name Affiliation Address Phone Rolf De Vegt Qualcomm 1700 Technology Drive San Jose, CA 95110, USA Sameer Vermani 5775 Morehouse Dr. San Diego, CA, USA Simone Merlin Tao Tian Tevfik Yucek VK Jones Youhan Kim Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 Jianhan Liu Mediatek USA
Name Affiliation Address Phone Jianhan Liu Mediatek USA 2860 Junction Ave, San Jose, CA 95134, USA Thomas Pare ChaoChun Wang James Wang Tianyu Wu Russell Huang James Yee No. 1 Dusing 1st Road, Hsinchu, Taiwan Alan Jauh Frank Hsu Joonsuk Kim Apple Aon Mujtaba Guoqing Li Eric Wong Chris Hartman Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 David X. Yang Jiayin Zhang Jun Luo
Name Affiliation Address Phone David X. Yang Huawei F1-17, Huawei Base, Bantian, Shenzhen Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Jun Luo Yi Luo Yingpei Lin Jiyong Pang Zhigang Rong 10180 Telesis Court, Suite 365, San Diego, CA NA Jian Yu Ming Gan Yunsong Yang Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Peter Loc Edward Au Teyan Chen Yunbo Li Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 Jinmin Kim LG Electronics
Name Affiliation Address Phone Jinmin Kim LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Kiseon Ryu Jinyoung Chun Jinsoo Choi Jeongki Kim Dongguk Lim Suhwook Kim Eunsung Park JayH Park HanGyu Cho Thomas Derham Orange 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 95134 Pooya Monajemi Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 Fei Tong Samsung Hyunjeong Kang
Name Affiliation Address Phone 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 75070 (972) Mark Rison Rakesh Taori (972) Sanghyun Chang Yasushi Takatori NTT 1-1 Hikari-no-oka, Yokosuka, Kanagawa Japan Yasuhiko Inoue Shoko Shinohara Yusuke Asai Koichi Ishihara Junichi Iwatani Akira Yamada NTT DOCOMO 3-6, Hikarinooka, Yokosuka-shi, Kanagawa, , Japan 3759 Yakun Sun, et. al. (Marvell)
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Authors (continued) March, 2016 Yakun Sun, et. al. (Marvell) Name
Affiliation Address Phone Masahito Mori Sony Corp. Yusuke Tanaka Yuichi Morioka Kazuyuki Sakoda William Carney Tomoko Adachi Toshiba Narendar Madhavan Kentaro Taniguchi Toshihisa Nabetani Tsuguhide Aoki Koji Horisaki David Halls Filippo Tosato Zubeir Bocus Fengming Cao Parag Kulkarni Yakun Sun, et. al. (Marvell)
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March, 2016 Authors (continued) Yakun Sun, et. al. (Marvell)
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Current L-LTF/L-STF Power Scaling
March, 2016 Current L-LTF/L-STF Power Scaling After adding 4 extra tones in L-SIG (and the following SIG symbols), L-LTF and L-SIG has different number of tones. It has been agreed that: “The L-SIG, RL-SIG, HE-SIG-A and HE-SIG-B fields are always transmitted with same total power as L-LTF field (in cases when L-LTF is not being boosted).” In other words, L-LTF based channel estimates needs to be scaled at receiver for SIG demod SIGB goes up to 16QAM 4 extra tones gives channel estimates at a different power level. There is no discussion regarding the power scaling for L-STF in the current SFD. Yakun Sun, et. al. (Marvell)
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Alternative Solution for L-LTF
March, 2016 Alternative Solution for L-LTF L-LTF scaling can be alternatively done at transmitter, to set the same power per tone between L-LTF/L-SIG. Why it is better? HELTF has been scaled such that it has the same power per tone as the data field to avoid scaling channel estimates at receiver side. It is always better to have the transmitter scaling for lower complexity in implementation. Negligible impact on L-SIG performance. Propose to modify the current SFD with the alternative solution for simpler receiver implementation. Yakun Sun, et. al. (Marvell)
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L-STF Power Scaling There are two options for L-STF power scaling:
March, 2016 L-STF Power Scaling There are two options for L-STF power scaling: Keep the same total power as L-SIG Keep the same total power as L-LTF. Following the convention of 11a~11ac, and due to the same number of tones in L-STF and L-LTF, propose to L-STF and L-LTF have the same total power. Minimal impact on implementation and performance: A fixed small (~0.3dB) power offset between L-STF and L-SIG won’t have impact on AGC setting. Yakun Sun, et. al. (Marvell)
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SP Do you support to modify the current SFD as March, 2016
The L-SIG, RL-SIG, HE-SIG-A and HE-SIG-B fields are always transmitted with same total power per tone as L-LTF field (in cases when L-LTF is not being boosted). The L-STF has the same total power as the L-LTF? Yakun Sun, et. al. (Marvell)
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