2019/02/02 by Mehdi Ganji, Ganji, Mehdi, Hongbing Cheng +6
Engineering · #Advanced MIMO Systems Optimization #FOS: Computer and information sciences #Information Theory (cs.IT) #Microwave Engineering and Waveguides #Millimeter-Wave Propagation and Modeling
paper · pdf · doi:10.48550/arxiv.1902.00838
openalex publication_date 2019/02/02 · openalex created_date 2022/07/29 · openalex updated_date 2026/07/28
In this study, we analyze the codebook design used for analog beamforming.\nAnalog beamforming and combining suffer from a subspace sampling limitation,\nthat is, the receiver cannot directly observe the channel coefficients;\ninstead, the receiver observes a noisy version of their weighted combination.\nTo resolve this, the transmitter and the receiver usually collaborate to\ndetermine the best beamformer combiner pair during the beam-sweeping process.\nThis is done by evaluating a limited number of codewords chosen from a\npre-defined codebook. In this study, we propose a new framework inspired by the\ngeneralized Lloyd algorithm to design analog beamforming codebooks that\noptimize various performance metrics including the average beamforming gain,\nthe outage, and the average data rate. The flexibility of our framework enables\nus to design beamforming codebooks for any array shapes including uniform\nlinear and planar arrays. The other practical complexity in analog beamforming\nis the low resolution of the phase shifters. Therefore, we have extended our\nalgorithm to create quantized codebooks that outperform the existing codebooks\nin literature. We have also provided extensive simulations to verify the\nsuperiority of our proposed codebook as compared with the existing codebooks.\n