研究目的
To reduce the feedback overhead in millimeter wave single user MIMO systems by proposing non-uniform quantization codebook based hybrid precoding schemes for full-connected and sub-connected structures.
研究成果
The proposed NUQ-HYP-Full and NUQ-HYP-Sub schemes achieve near-optimal spectral efficiencies with reduced feedback overhead (at least 12.5% reduction) compared to uniform quantization-based methods. The sub-connected structure requires fewer quantization bits than the full-connected structure for similar performance, providing new insights for low feedback overhead designs in millimeter wave MIMO systems.
研究不足
The study assumes perfect channel state information at the receiver only and does not consider wideband or time-varying channel scenarios. The impact of abrupt rotation on angles is omitted, and the quantization resolution of phase shifters is assumed large enough. The simulations are based on specific urban environment measurements, which may not generalize to all scenarios.
1：Experimental Design and Method Selection:
The study designs hybrid precoding schemes using non-uniform quantization codebooks based on the sparseness property of millimeter wave channels in the angular domain. It involves grouping angles into spatial lobes, mapping quantization bits non-uniformly, and constructing codebooks. Algorithms for codebook construction and hybrid precoding are detailed.
2：Sample Selection and Data Sources:
Simulations are conducted using a spatial lobes millimeter wave channel model based on measurements from NYU WIRELESS in Manhattan at 28 GHz, with parameters like number of spatial lobes (P), subpaths (Q), antennas (Nt, Nr), and RF chains (NRF).
3：List of Experimental Equipment and Materials:
Uniform linear arrays (ULAs) with λ/2 antenna spacing are used at transmitter and receiver. Phase shifters and RF chains are part of the system model, but specific models or brands are not mentioned.
4：Experimental Procedures and Operational Workflow:
The workflow includes constructing NUQ codebooks (Algorithms 1 and 3), designing hybrid precoding matrices (Algorithms 2 and 4), and simulating spectral efficiencies under various conditions (e.g., different P, Q, b, SNR).
5：Data Analysis Methods:
Spectral efficiency is calculated and compared against benchmarks like UQ-OMP, SIC-based schemes, and fully digital precoding using simulation results plotted in figures.
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