doc.: IEEE 802.11-13/1110r1September 2013

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Beam codebook design scheme for IEEE802.11aj

DU GuanglongSlide 1

Date: 2013-09-16

Presenter:

doc.: IEEE 802.11-13/1110r1September 2013

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Author List

DU GuanglongSlide 2

Name Company Address Phone email ZOU Weixia BUPT/CWPAN

DU Guanglong BUPT/CWPAN

HUANG Shanguo BUPT/CWPAN

CHEN Qian I2R / CWPAN

CHEN Jiamin Huawei /CWPAN

CHIN Francois I2R /CWPAN

GAO Bo Tsinghua /CWPAN

HAO Peng JUST /CWPAN

HONG Wei SEU /CWPAN

LI Zhiqiang IMECAS /CWPAN

LIU Zongru Hangzhou Millimeter Wave /CWPAN

LIU Pei Hisilicon /CWPAN

LU Su Huawei /CWPAN

PENG Xiaoming I2R/CWPAN

PNG Khiam Boon I2R /CWPAN

WANG Haiming SEU /CWPAN

YUE Guangrong UESTC/CWPAN

ZHUO Lan CESI/CWPAN

doc.: IEEE 802.11-13/1110r1September 2013

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Abstract

• Introduction of beam codebook

• Proposed N-phase beam codebook design

• Conclusion

Slide 3 DU Guanglong

doc.: IEEE 802.11-13/1110r1September 2013

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Introduction of Beam codebook (1/5)

• For 60GHz communication, use of array antenna can get a high antenna gain and realize spatial reuse.

• Taking into consideration of implementation complexity, it is suitable to consider a beam-switching system or a phased-array for 60GHz communication.

DU GuanglongSlide 4

doc.: IEEE 802.11-13/1110r1September 2013

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Introduction of Beam codebook (2/5)

• System model

• A codebook is a matrix W where each column specifies the beam former vector or combiner vector to be used.

• The phase array has widely used in 60GHz millimeter communication.

DU GuanglongSlide 5

Phase shifter

receiver

Phase shifter

RF-channel

……

Antenna Antenna

transmitter

doc.: IEEE 802.11-13/1110r1September 2013

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Introduction of Beam codebook (3/5)

• The codebook beam vectors are given by the column vectors of the matrix shown in the following equation (K≥M) *

• Where m denotes the antenna index, k denotes the beam index, and M is the total number of antennas, K is the total number of beams.

• Function fix(x) returns the biggest integer smaller than or equal to its argument, and mod(x,y) is the modulo function and is defined as x–fix(x/y)×y.

• There are 4 phases (0°,±90°,180°) used in this codebook.

• The gain loss at the intersections of two adjacent beams is less than 1 dB when K≥2M*

Slide 6 DU Guanglong

mod( ( /2), )( )

/4( , ) 0, 1; 0, 1m k K K

fixKm k j m M k K

W

Reference:*

1)Wang J, Lan Z, Pyo C, et al.. Beamforming codebook design and performance evaluation for millimeter-wave WPAN. Proc. of the IEEE Vehicular Technology Conference (VTC2009 Fall)2)IEEE 802.15.3c technical specification

(1)

doc.: IEEE 802.11-13/1110r1September 2013

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Introduction of Beam codebook (4/5)

• Left figure: the 5th and 12th beam patterns when M=8, K=16.

• Right figure: all the 16 beam patterns when M=8, K=16.

Slide 7 DU Guanglong

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doc.: IEEE 802.11-13/1110r1September 2013

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Introduction of Beam codebook (5/5)

• Summary of the beam codebook (1) in slide 6:– The codebook matrix consists of only 4 phases, and

lacking flexibility;

– Gain loss of main lobe will be increased with the increase of antenna elements;

– The side lobe level is high;

– The codebook can be used in 2-D array by use separable codebooks along the polar angle direction and azimuth angle direction.

Slide 8 DU Guanglong

doc.: IEEE 802.11-13/1110r1September 2013

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The Proposed N-phase beam codebook design (1/5)

• We extend the beam codebook further, and give the following equation:

• Here, m, k, M, K and functions fix(x), mod(x,y) is defined as before.

• N denotes the number of phases of the codebook, that is to say, this codebook is consists of N phases but not 4 phases – codebook (1) used by IEEE802.15.3c.

• N is a user-defined parameter, and the more phases of the codebook (N), the better of the performance.

Slide 9 DU Guanglong

1,...,1,0;1,...,1,0,),( /

)),2/(mod(2

KkMmekm NK

KKkmfix

Nj

W (2)

doc.: IEEE 802.11-13/1110r1September 2013

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The Proposed N-phase beam codebook design (2/5)

• Left figure: the 2nd beam of codebook (1) with M=8, K=16 (red line), and the 2nd beam of N-phase codebook with M=8, K=16, N=16 (blue line);

• Right figure: the 11th beam of codebook (1) with M=8, K=16 (red line), and the 2nd beam of N-phase codebook with M=8, K=16, N=16 (blue line);

Slide 10 DU Guanglong

doc.: IEEE 802.11-13/1110r1September 2013

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The Proposed N-phase beam codebook design (3/5)

• Left figure: all the 16 beam patterns of codebook (1) with M=8 and K=16;

• Right figure: all the 16 beam patterns of Proposed N-phase codebook with M=8, K=16 and N=8;

Slide 11 DU Guanglong

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doc.: IEEE 802.11-13/1110r1September 2013

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The Proposed N-phase beam codebook design (4/5)

• For the parameter N, we have conclusions as:– N=4, the codebook is same as codebook (1) in slide 6;

– Gain loss of main lobe and side lobe level will decreases with the increase of N;

– When N≥K, the gain loss of main lobe and side lobe level are change little.

DU GuanglongSlide 12

N-phase codebook’s max gain loss of main lobe with different N when M=8

N-phase codebook’s max gain loss of main lobe with different N when M=16

doc.: IEEE 802.11-13/1110r1September 2013

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The Proposed N-phase beam codebook design (5/5)

• Some performance data for codebook (1) with M=8 and K=16 (here denoted by 3c), and N-phase codebook with M=8, K=16, N=8 (here denoted by 8-phase).– HPBW: half power beam width; SLL: side lobe level; Gmax: maximum

gain of main lobe

DU GuanglongSlide 13

Index HPBW SLL (dB) Gmax (dB)3c 8-phase 3c 8-phase 3c 8-phase

0 54.6 o 54.6 o -12.8 -12.8 9.03 9.031 27.2 o 29.6 o -7.2 -11.2 8.25 8.872 19.4 o 20 o -6.7 -12.8 8.38 9.033 16.8 o 16.6 o -9.0 -11.2 8.18 8.874 15 o 15 o -12.8 -12.8 9.03 9.035 13.6 o 14 o -7.2 -11.2 8.25 8.876 13.2 o 13.4 o -6.7 -12.8 8.37 9.037 13.2 o 13.2 o -9.0 -11.2 8.18 8.878 13 o 13 o -12.8 -12.8 9.03 9.039 13 o 13.2 o -7.2 -11.2 8.25 8.87

10 13.4 o 13.4 o -6.7 -12.8 8.38 9.0311 14 o 14 o -8.9 -11.2 8.18 8.8712 15 o 15 o -12.8 -12.8 9.03 9.0313 16.8 o 16.8 o -7.2 -11.2 8.25 8.8714 20.2 o 20 o -6.7 -12.8 8.38 9.0315 29.6 o 32.4 o -9.0 -11.2 8.18 8.87

doc.: IEEE 802.11-13/1110r1September 2013

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Conclusion

• Proposed a N-phase codebook:– N-phase codebook consists of N phases, and N can be defined by

user, which gives the codebook more flexibility;

– N should be less than or equal to the number of beam patterns K;

– The N-phase codebook can demonstrate a better performance than the codebook used in IEEE802.15.3c.

• The proposed N-phase codebook is an informative procedure to obtain a beam code book for vendor’s choice in their implementation. It can be considered to be included in the appendix

DU GuanglongSlide 14

doc.: IEEE 802.11-13/1110r1September 2013

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References

[1] 11-09-0334-08-00ad-channel-models-for-60-ghz-wlan-systems;

[2] 11-12-0682-00-cmmw-introduction-of-cmmw-par-and-5c;

[3] 11-12-0140-09-cmmw-ieee-802-11-cmmw-sg-par;

[4] 15-08-0361-00-003c-beamforming;

Slide 15 DU Guanglong

doc.: IEEE 802.11-13/1110r1September 2013

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Thank you！

Slide 16 DU Guanglong