Near-Optimal Design for Hybrid Beamforming in mmWave Massive Multi-User MIMO Systems

Yang Zhang,Rupak Kharel,Khaled M Rabie,Xingwang Li,Yuanzhi Chen,Jianhe Du

doi:10.1109/access.2020.3009238

Abstract

Millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems can obtain sufficient beamforming gains to combat severe path loss in signal propagation. The hybrid (analog/digital) beamforming with multiple data streams can be utilized to further improve mmWave spectral efficiency. In this paper, we focus on the hybrid beamforming design of a downlink mmWave massive multi-user MIMO (MU-MIMO) system based on full-connected structure, and aim to maximize the sum rate of the overall system as an objective function. In the analog beamforming stage, a piecewise successive iterative approximation (PSIA) algorithm is proposed to design the analog beamformer and combiner. This algorithm not only has a linear property, but also can obtain closed-form solutions. In the digital beamforming stage, the piecewise successive approximation method is utilized to design the digital beamforming based on the criterion to avoid the loss of information, which can help reduce the computational complexity and is also implemented simply. The results show that the proposed scheme achieves good sum-rate performance in the mmWave massive MU-MIMO system, and outperforms the state-of-the art MIMO hybrid beamforming design schemes, even when the number of base station antennas is not very large.

Highlights

The developments of traditional wireless communication technologies seem to encounter bottleneck constraints due to the limited bandwidths
We focus on the hybrid beamforming design of millimeter wave (mmWave) massive MU-multiple-input multiple-output (MIMO) system with full-connected structure, where the single BS equipped with a large antenna array is assumed to serve several multi-antenna multi-stream users
It is worth noting that we focus on the hybrid beamforming design of massive MIMO system with full-connected structure in the paper

Summary

Introduction

The developments of traditional wireless communication technologies seem to encounter bottleneck constraints due to the limited bandwidths. To meet the great requirements of wireless communication, millimeter wave (mmWave) communication has been considered as a key technology for the next-generation wireless communication systems [1], [2]. MmWave communication generally corresponds to 30–300 GHz tremendous frequency bands available to support Gigabits per second (Gb/s) data rate transmission. This has gained considerable attention in wireless. MmWave systems can integrate massive multiple-input multiple-output (MIMO) transceiver elements to provide a sufficiently powerful received signal, which can enhance the signal gain and spectral efficiency [8], [9]

Objectives

Methods

Findings

Conclusion