Submission doc.: IEEE 802.11-15/0799r0 July 2015 Myeong-Jin Kim, Korea UniversitySlide 1 Discussion...
11
Submission doc.: IEEE 802.11- 15/0799r0 July 2015 Myeong-Jin Kim, Korea University Slide 1 Discussion on MU-MIMO based on Hybrid Beamforming System in 802.11ay Date: YYYY-MM-DD Authors: N am e A ffiliations A ddress Phone em ail Y oung-ChaiK o K oreaU niversity Seoul, K orea koyc@ korea.ac.kr M yeong-Jin K im K oreaU niversity Seoul, K orea sm jkmj1004@ korea.a c.kr Ji-H o Lee K oreaU niversity Seoul, K orea [email protected] r
-
Upload
logan-gilbert -
Category
Documents
-
view
213 -
download
0
Transcript of Submission doc.: IEEE 802.11-15/0799r0 July 2015 Myeong-Jin Kim, Korea UniversitySlide 1 Discussion...
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 1
Discussion on MU-MIMO based on Hybrid Beamforming System in 802.11ay
Date: YYYY-MM-DD
Name Affiliations Address Phone email Young-Chai Ko Korea University Seoul, Korea [email protected]
Myeong-Jin Kim Korea University Seoul, Korea [email protected]
Ji-Ho Lee Korea University Seoul, Korea [email protected]
Authors:
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 2
Abstract
• In [1], MU-MIMO scheme for 802.11ay was introduced.
• In this presentation, we further discuss on the need for MU-
MIMO and the parameters which should be determined to
support MU-MIMO in 802.11ay.
• Also, we consider codebooks for hybrid beamforming to support
MU-MIMO.
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 3
Need for MU-MIMO in 802.11ay
• 802.11ay considers many usage scenarios as follows [2].
Ultra short range (USR) communications
Augmented reality and virtual reality
Video/mass-data distribution/video on demand system
Etc.
• In order to use 802.11ay for a scenario such as video/mass-data
distribution/video on demand system, 802.11ay may support
multiuser transmission.
Submission
doc.: IEEE 802.11-15/0799r0
Myeong-Jin Kim, Korea University
Hybrid Beamforming for MU-MIMO
Slide 4
• System model
ADC
Analog/RF beamforming
STA 1
ADC
Analog/RF beamforming
STA K
DAC
Analog/RF beamforming
AP
DAC
BB
filter
MIM
O d
eco
der
Digital/baseband beamforming
Channel
1H
KH
BB
filter
Digital/baseband beamforming
DAC
MIM
O d
eco
der
July 2015
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 5
Parameters for MU-MIMO in 802.11ay
• We consider the hybrid beamforming to support DL MU-MIMO
transmission in 802.11ay.
• Therefore, the following parameters should be considered.
The number of RF chains in AP (NRF) is equal to or lager than the
maximum number of data streams (that is, spatial multiplexing gain),
which AP can transmit.
The number of RF chains in STA k ( ) is equal to the maximum number
of streams that STA k can decode.
• Parameter inequality
when U is the number of service users.
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 6
Beamforming Design Problem for MU-MIMO Hybrid Beamforming
• Problem formulation
• As the number of STAs and the size of codebook increase, the overhead required to determine the RF/digital beams exponentially increases.
• Low complexity and low overhead hybrid beamformming algorithm is required!
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 7
Codebooks for Hybrid Beamforming
• Different codebooks may be considered for RF/digital beamforming due to their respective properties.
• Candidate codebooks for RF beam Codebook in IEEE 802.15.3c (WPAN) DFT-based codebook Beamsteering codebook
• Candidate codebook for digital beam Grassmannian codebook
Submission
doc.: IEEE 802.11-15/0799r0
ADC
Analog/RF beamforming
STA 1
ADC
Analog/RF beamforming
STA K
DAC
Analog/RF beamforming
AP
DAC
BB
filter
MIM
O decoder
Digital/baseband beamforming
Channel
1H
KH
BB
filter
Digital/baseband beamforming
DAC
MIM
O decoder
July 2015
Myeong-Jin Kim, Korea UniversitySlide 8
Procedure of Designing MU-MIMO Hybrid Beamforming (1/2)
Determination of RF beamforming/filter
Feedback of effective channel information
Design of digital beamforming/filter
1 2 3
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 9
Procedure of Designing MU-MIMO Hybrid Beamforming (1/2)
• Stage 1: Determination of RF beamforming/filter
Without considering the effect of digital beamforming/filter, RF
beamforming/filters for each user are selected based on the beam
training.
• Stage 2: Feedback of effective channel information
AP sends the pilot sequence.
Each STA estimates and quantizes its effective channel (the product of
full channel matrix and RF beamforming/filters).
Each STA feeds back the index of the quantized channel to AP.
• Stage 3: Obtaining digital beamforming/filter
AP calculates the digital beamforming/filter based on the quantized
channels and forwards the digital filters to STAs.
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 10
Conclusion
• We discussed on the need for MU-MIMO and the parameters
which should be determined to support multiuser in 802.11ay.
• We suggested the procedure to design the hybrid beamforming for
DL MU transmission.
Submission
doc.: IEEE 802.11-15/0799r0July 2015
Myeong-Jin Kim, Korea UniversitySlide 11
References
[1] IEEE 802.11-15/0356r0, “MU-MIMO schemes for NG60”
[2] IEEE 802.11-15/0328r4, “NG 60 Use Cases”
![Postpr intkth.diva-portal.org/smash/get/diva2:903297/FULLTEXT01.pdf · Examples include IEEE 802.15.3c, ECMA 387 [1], IEEE 802.11ad [3], WirelessHD, WiGig, and recently the IEEE 802.11ay](https://static.fdocuments.net/doc/165x107/5f0226107e708231d402d018/postpr-903297fulltext01pdf-examples-include-ieee-802153c-ecma-387-1-ieee.jpg)
