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Hybrid precoding design is challenging for millimeter-wave (mmWave) massiveMIMO. Most prior hybrid precoding schemes are designed to maximize the sumspectral efficiency (SSE), while seldom investigate the bit-error-rate (BER).Therefore, we propose an over-sampling codebook (OSC)-based hybrid minimumsum-mean-square-error (min-SMSE) precoding scheme for mmWave multi-userthree-dimensional (3D)-MIMO systems to optimize the BER, where multi-usertransmission with multiple data streams for each user is considered.Specifically, given the effective baseband channel consisting of the realchannel and analog precoding, we first design the digital precoder/combinerbased on min-SMSE criterion to optimize the BER. To further reduce the SMSEbetween the transmit and receive signals, we propose an OSC-based joint analogprecoder/combiner (JAPC) design. Simulation results show that the proposedscheme can achieve the better performance than its conventional counterparts.

Over-Sampling Codebook-Based Hybrid Minimum Sum-Mean-Square-Error Precoding for Millimeter-Wave 3D-MIMO