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In this paper, we focus on the design of the hybrid analog/digital precodingin millimeter wave multiple-input multiple-output (MIMO) systems. To reduce thefeedback overhead, we propose two non-uniform quantization (NUQ) codebook basedhybrid precoding schemes for two main hybrid precoding implementations, i.e.,the full-connected structure and the sub-connected structure. Specifically, wefirstly group the angles of the arrive/departure (AOAs/AODs) of the scatteringpaths into several spatial lobes by exploiting the sparseness property of themillimeter wave in the angular domain, which divides the total angular domaininto effective spatial lobes' coverage angles and ineffective coverage angles.Then, we map the quantization bits non-uniformly to different coverage anglesand construct NUQ codebooks, where high numbers of quantization bits areemployed for the effective coverage angles to quantize AoAs/AoDs and zeroquantization bit is employed for ineffective coverage angles. Finally, twolow-complexity hybrid analog/digital precoding schemes are proposed based onNUQ codebooks. Simulation results demonstrate that, the proposed two NUQcodebook based hybrid precoding schemes achieve near-optimal spectralefficiencies and show the superiority in reducing the feedback overheadcompared with the uniform quantization (UQ) codebook based works, e.g., atleast 12.5% feedback overhead could be reduced for a system with 144/36transmitting/receiving antennas.

Hybrid Precoding Based on Non-Uniform Quantization Codebook to Reduce Feedback Overhead in Millimeter Wave MIMO Systems