September 2013 doc IEEE 802 11 131110 r

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 Beam codebook design scheme for IEEE 802. 11 aj Date: 2013 -09 -16 Presenter: Submission Slide 1 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 Author List Submission Slide 2 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 Abstract • Introduction of beam codebook • Proposed N-phase beam codebook design • Conclusion Submission Slide 3 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 Introduction of Beam codebook (1/5) • For 60 GHz 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 beamswitching system or a phased-array for 60 GHz communication. Submission Slide 4 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 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 60 GHz millimeter communication. Submission Slide 5 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 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) * (1) • 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 d. B when K≥ 2 M* 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 (VTC 2009 Fall) 2)IEEE 802. 15. 3 c technical specification Submission Slide 6 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 Introduction of Beam codebook (4/5) • Left figure: the 5 th and 12 th beam patterns when M=8, K=16. • Right figure: all the 16 beam patterns when M=8, K=16. Submission Slide 7 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 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. Submission Slide 8 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 The Proposed N-phase beam codebook design (1/5) • We extend the beam codebook further, and give the following equation: (2) • 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 IEEE 802. 15. 3 c. • N is a user-defined parameter, and the more phases of the codebook (N), the better of the performance. Submission Slide 9 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 The Proposed N-phase beam codebook design (2/5) • • Left figure: the 2 nd beam of codebook (1) with M=8, K=16 (red line), and the 2 nd beam of N-phase codebook with M=8, K=16, N=16 (blue line); Right figure: the 11 th beam of codebook (1) with M=8, K=16 (red line), and the 2 nd beam of N-phase codebook with M=8, K=16, N=16 (blue line); Submission Slide 10 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 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; Submission Slide 11 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 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. N-phase codebook’s max gain loss of main lobe with different N when M=8 Submission N-phase codebook’s max gain loss of main lobe with different N when M=16 Slide 12 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 The Proposed N-phase beam codebook design (5/5) • Some performance data for codebook (1) with M=8 and K=16 (here denoted by 3 c), 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 Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Submission 3 c 54. 6 o 27. 2 o 19. 4 o 16. 8 o 15 o 13. 6 o 13. 2 o 13. 4 o 15 o 16. 8 o 20. 2 o 29. 6 o HPBW 8 -phase 54. 6 o 29. 6 o 20 o 16. 6 o 15 o 14 o 13. 2 o 13. 4 o 15 o 16. 8 o 20 o 32. 4 o 3 c -12. 8 -7. 2 -6. 7 -9. 0 -12. 8 -7. 2 -6. 7 -8. 9 -12. 8 -7. 2 -6. 7 -9. 0 SLL (d. B) 8 -phase -12. 8 -11. 2 -12. 8 -11. 2 Slide 13 3 c 9. 03 8. 25 8. 38 8. 18 9. 03 8. 25 8. 37 8. 18 9. 03 8. 25 8. 38 8. 18 Gmax (d. B) 8 -phase 9. 03 8. 87 9. 03 8. 87 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 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 IEEE 802. 15. 3 c. • 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 Submission Slide 14 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 References [1] [2] [3] [4] 11 -09 -0334 -08 -00 ad-channel-models-for-60 -ghz-wlan-systems; 11 -12 -0682 -00 -cmmw-introduction-of-cmmw-par-and-5 c; 11 -12 -0140 -09 -cmmw-ieee-802 -11 -cmmw-sg-par; 15 -08 -0361 -00 -003 c-beamforming; Submission Slide 15 DU Guanglong

September 2013 doc. : IEEE 802. 11 -13/1110 r 1 Thank you！ Submission Slide 16 DU Guanglong