Low Complexity Hybrid Analog-Digital Beamforming for Millimeter-Wave Massive MIMO System

Abstract

Millimeter-wave massive multiple-input multiple-output (MIMO) is a dominant challenge technology to provide wider bandwidth and higher throughput than present wireless systems and networks in performance for future generation communication systems. Existing works suffer from performance degradation in spectral efficiency and computational complexities. To achieve higher spectral efficiency and low computational complexity, lots of exploration has been focused on designing narrowband hybrid beamforming structures recently. However, to achieve analog beamforming, most hybrid precoders and combiners use limitless or high-resolution phase shifters (HR-PSs). However, low-resolution phase shifters (LR-PSs) to achieve better performance in spectral efficiency near digital beamforming at millimeter-wave (mmWave) frequencies, will significantly decrease computational complexity. In this paper, we examine a hybrid precoder and combiner architecture with LR-PSs for millimeter-wave massive MIMO systems to reduce the computational complexity in terms of iterations. When compared to standard optimization methods, the suggested approach performs better in terms of spectral efficiency, bit-error-rate and has lower computational complexity.