1. Feedback Tone Map and Quantization
May, 2016
Feedback Tone Map and Quantization
Date:
Authors:
Name
Affiliation
Address
Phone
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Zhou Lan
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Thomas Derham
Mingyue Ji
Ron Porat, Broadcom, et. al.

2. Authors (continued) May, 2016 Alice Chen Qualcomm 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
Bin Tian
Carlos Aldana
1700 Technology Drive San Jose, CA 95110, USA
George Cherian
Gwendolyn Barriac
Hemanth Sampath
Lin Yang
Lochan Verma
5775 Morehouse Dr. San Diego, CA USA
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

3. Authors (continued) May, 2016 Rolf De Vegt Qualcomm Sameer Vermani
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
Tevfik Yucek  
VK Jones
Youhan Kim

4. 2111 NE 25th Ave, Hillsboro OR 97124, USA
May, 2016
Authors (continued)
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
Ron Porat, Broadcom, et. al.

5. 5488 Marvell Lane, Santa Clara, CA, 95054
May, 2016
Authors (continued)
Name
Affiliation
Address
Phone
Hongyuan Zhang
Marvell
5488 Marvell Lane, Santa Clara, CA, 95054
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
Ron Porat, Broadcom, et. al.

6. Authors (continued) May, 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
Ron Porat, Broadcom, et. al.

7. Authors (continued) May, 2016 David X. Yang Huawei Jiayin Zhang
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
Yuchen Guo
Yunsong Yang
Junghoon Suh
303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Peter Loc
Edward Au
Teyan Chen
Yunbo Li
Ron Porat, Broadcom, et. al.

8. Authors (continued) May, 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
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
Ron Porat, Broadcom, et. al.

9. Authors (continued) May, 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
Ron Porat, Broadcom, et. al.

10. Authors (continued) May, 2016 Minho Cheong Newracom 9008 Research Dr.
Name
Affiliation
Address
Phone
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Sigurd Schelstraete
Quantenna
Huizhao Wang
Minho Cheong
Newracom
9008 Research Dr.
Irvine, CA 92618
Reza Hedayat
Young Hoon Kwon
Yongho Seok
Daewon Lee
Yujin Noh
Ron Porat, Broadcom, et. al.

11. May, 2016
Authors (continued)
Ron Porat, Broadcom, et. al.

12. Outline May, 2016 In Macau, we agreed on the following:
Roster of tones to be used for full bandwidth channel feedback
Granularity of partial bandwidth feedback: 26 tone RU
AP signals start and end 26 RUs to indicate bandwidth of partial feedback
This contribution:
Tone plan for partial bandwidth feedback
Quantization resolution to be used
Ron Porat, Broadcom, et. al.

13. Tone plan for partial bandwidth feedback
May, 2016
Tone plan for partial bandwidth feedback
AP signals start and end 26 RU for feedback
Provide a table mapping (start, end) 26 RUs to (startTone, endTone) fed back by STA
STA feeds back all tones from the roster between “S” tone of start 26 RU and “E” tone of end 26 RU
General philosophy
startTone, endTone are elements of feedback roster (for full bandwidth feedback)
startTone, endTone are chosen to cover the RU (these tones may lie outside the RU to avoid extrapolation)
Example
FB roster for 20 MHz bandwidth and Ng = 4: [-120:4:-4, 4:4:120] + edge(±2,±122)
AP requests 2nd 26 RU. Tones in RU : [-95:1:-70]
Tones common to roster and RU : [-92:4:-72]
Add the tones -96 and -68 in feedback for 2nd RU to avoid extrapolation
160 MHz case
26 RU occupying lower frequencies has a smaller index
RU indices range from 0 to 73
AP uses 7 bits each to signal the start and end 26 RUs in NDPA
STA uses same indexing scheme to indicate start and end 26 RUs in MIMO control field
Ron Porat, Broadcom, et. al.

14. Quantization resolution
May, 2016
Quantization resolution
MU-MIMO in 11ax is fundamentally same as in 11ac
Differences: can happen over partial bandwidths, larger Ng chosen to tackle larger FFT sizes
But what happens on any given tone is fundamentally no different
Quantization resolution that worked in 11ac will work in 11ax too – verified again in simulations
Quantization resolutions for the Givens angles ϕ, ψ in
MU feedback: (9,7) and (7,5) bits
SU feedback: (6,4) and (4,2) bits
Ron Porat, Broadcom, et. al.

15. SP #1 May, 2016 Do you agree add to the 11ax SFD
For all feedback types, the AP shall use 7 bits each to signal the start and end 26 RU for partial bandwidth feedback
The index used to signal a 26 RU increases with frequency, with the minimum value of the index being 0. For NDP bandwidths of 20, 40, 80, 160 MHz, the maximum value of the index shall be 8, 17, 36 and 73 respectively.
The start and end 26 RUs in the HE MIMO Control Field shall use the same indexing as above
Ron Porat, Broadcom, et. al.

16. SP #2 May, 2016 Do you agree add to the 11ax SFD
The STA feeds back the channel on all tones from the feedback roster (Table 1, document on slide 13) between
“S” tone corresponding to start 26 RU index
and
“E” tone corresponding to end 26 RU index
where the “S” and “E” tones are defined as function of RU index in Table 2a for Ng = 4 and Table 2b for Ng = 16 (document on slide 13)
Note: For 160 MHz, to determine the “S” and “E” tones, RUs occupying the higher 80 MHz use the same table as RUs 0-36 occupying the lower 80 MHz
Ron Porat, Broadcom, et. al.

17. SP #3 May, 2016 Do you agree add to the 11ax SFD
The only quantization resolutions for the Givens angles ϕ, ψ in
MU feedback shall be (9,7) and (7,5) bits
SU feedback shall be (6,4) and (4,2) bits
Note: MU resolution with Ng = 16 is limited to (9,7)
Ron Porat, Broadcom, et. al.