Iterative Hybrid beamforming for Rate Maximization in mmWave Systems with Discrete Phase Shifters

With an increased interest in utilizing the mmWave, beamforming has drawn more attention in recent years. Aside from all the improvements obtained via beamforming, it is an adherent technique in mmWave systems due to the severe path loss in such systems. Practical considerations have emerged hybrid structures for implementing this technology. Hybrid beamforming systems rely on phase shifters in their analog stage. Designing tunable phase shifters with high precision is hard and costly, hence in practical systems, discrete phase shifters are favored. In this paper, we propose a novel method to design the hybrid beamforming system. The focus of this paper is to formulate the hybrid beamforming design problem with discrete phase shifters in a discrete optimization problem form and provide simple methods to obtain its solution. The proposed methods are computationally efficient and can provide comparable performance to the current line of work in this field.