Performance Evaluation of a Millimeter Wave MIMO Hybrid Beamforming System

Abstract

Massive MIMO (multiple-input-multiple-output) technology along with beamforming has become the mainstream feature in 5G physical layer technologies to provide high increase in spectral efficiency and to combat the high propagation loss at high frequencies. Unlike conventional MIMO systems where all the signal processing is carried out in the digital domain, Hybrid Analog-Digital (HAD) signal processing or hybrid beamforming has the potential to reduce cost and power consumption. In this paper, a novel hybrid beamforming architecture based on the orthogonal matching pursuit (OMP) algorithm is exploited for a single-user system in which massive antenna array is operated by a limited number of transmit and receive RF chains. A simulation model is studied for performance of the hybrid beamformer compared to conventional digital beamformer of the proposed system. Results show spectral efficiency as performance metric which shows near optimal efficiency using hybrid beamforming weights compared to the digital weights.