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Beam codebook design scheme for IEEE802.11aj

Date: 20 13-09-16. Beam codebook design scheme for IEEE802.11aj. Presenter:. Author List. Abstract. Introduction of beam codebook Proposed N-phase beam codebook design Conclusion. Introduction of Beam codebook (1/5).

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Beam codebook design scheme for IEEE802.11aj

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  1. Date:2013-09-16 Beam codebook design scheme for IEEE802.11aj Presenter: DU Guanglong

  2. Author List DU Guanglong

  3. Abstract • Introduction of beam codebook • Proposed N-phase beam codebook design • Conclusion DU Guanglong

  4. 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 Guanglong

  5. 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 Guanglong

  6. 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* (1) Reference:* • 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) • IEEE 802.15.3c technical specification DU Guanglong

  7. 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. DU Guanglong

  8. 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. DU Guanglong

  9. 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. (2) DU Guanglong

  10. 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); DU Guanglong

  11. 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; DU Guanglong

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

  13. 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 Guanglong

  14. 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 Guanglong

  15. 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; DU Guanglong

  16. Thank you！ DU Guanglong

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