Impact of Analog Precoding Types on the Spectral Efficiency of Millimeter Wave Hybrid Beamforming Systems

Abstract

Large antenna arrays can provide beamforming gain to overcome the high pathloss in millimeter wave channels. In this paper, we investigate the impact of analog precoding types on the spectral efficiency of millimeter wave hybrid beamforming (HBF) systems. In analog precoding, we consider the strongest path precoder, the Liang's precoder [1] and the Yu's precoder [2]. The spectral efficiency is calculated for varying signal-to-noise ratio (SNR) and numbers of radio-frequency (RF) chains. Also, we consider two cases where users are close or far away. In addition, the array pattern with these analog precoders are investigated. These investigations give an insight into the gains of HBF.