Abstract
Beamforming is an enabling technique for wireless communications over higher frequency band, e.g., mmWave frequency band. To enhance beam concentration and homogenization within any angle range, we propose a hybrid beamforming design in three steps. First, through analyzing radiation power ratio, we find the bases of beamforming vector to guarantee a satisfactory level of power radiated over the targeted angle range. Second, with the derived bases, we flat the response of the passband by solving a max-min optimization problem using semidefinite relaxation technique. Third, we perform hybrid decomposition to achieve compatibility with phased array antenna with hybrid structure. The proposed beamforming is verified through quantitative measurement of beam concentration and homogenization. Simulation results show that the beamform pattern designed by our method outperform other existing methods in multi-cell scenarios.
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