Multiuser Parallel Transmission with 1-tap Time Domain Beamforming by Millimeter Wave Massive Antenna Arrays

Abstract

This paper investigates the feasibility of multiuser parallel transmission by sub-array beamforming using millimeter wave bands in which the Line-of-Sight LoS dominant channel environment is expected Focusing on high beamforming gain provided by the massive antenna array each sub-array conducts first eigenmode transmission and thus one stream is allocated per user without null steering This paper also proposes 1-tap time domain beamforming TDBF as the same weight is applied to all frequency components It reduces computation complexity as well as suppressing the effect of additive noise on weight derivation Computer simulation results show that increasing the subarray spacing stably improves signal-to-interference power ratio SIR performance and that the proposed 1-tap TDBF can match the performance of the frequency domain first eigenmode transmission as a rigorous solution