Spectral Efficiency Analysis of Hybrid Precoding in Millimeter Wave MIMO Systems
The utilization of millimeter wave (mmWave) frequency has shown great potential for future wireless cellular systems. Compared with conventional fully digital precoding, hybrid precoding achieves a high performance with less radio frequency (RF) chains and lower hardware complexity. In this paper, we investigate the hybrid precoding for multiuser communication in a downlink mmWave massive MIMO system. First, we present a hybrid precoding scheme designed based on zero-forcing (ZF) precoding. Then, we derive the spectral efficiency of this hybrid precoding scheme and get its closed-form expression which can be represented by the digamma function. Finally, simulation results demonstrate the validity of the analytical result.
KeywordsHybrid precoding Millimeter wave Zero forcing Spectral efficiency
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