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首页> 外文会议>IEEE/CIC International Conference on Communications in China >Angle-based codebook for low-resolution hybrid precoding in millimeter-wave massive MIMO systems
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Angle-based codebook for low-resolution hybrid precoding in millimeter-wave massive MIMO systems

机译：基于角度的码本，用于毫米波大规模MIMO系统中的低分辨率混合预编码

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摘要

Hybrid precoding is a promising technique for millimeter-wave massive MIMO systems, as it can significantly reduce the number of radio-frequency (RF) chains with near-optimal performance. To further reduce the power consumption, low-resolution hybrid precoding utilizing low-resolution phase shifters is recently proposed without an obvious performance loss. However, traditional channel feedback codebooks that quantize the channel with high resolution are not suitable to low-resolution hybrid precoding. In this paper, we design an angle-based codebook for low-resolution hybrid precoding, where the analog codebook is designed based on channel angle-of-departures (AoDs), while the digital codebook is designed by random vector quantization (RVQ). As the angle coherence time is much longer than the channel coherence time, the selected analog codeword from the analog codebook remains unchanged in a much longer time scale. Thus, the channel feedback overhead can be significantly reduced. Simulation results illustrate that the proposed codebook with low overhead for channel feedback is able to achieve the acceptable sum-rate performance.
机译：对于毫米波大规模MIMO系统而言，混合预编码是一种很有前途的技术，因为它可以显着减少接近最佳性能的射频（RF）链的数量。为了进一步降低功耗，最近提出了使用低分辨率移相器的低分辨率混合预编码而没有明显的性能损失。然而，以高分辨率量化信道的传统信道反馈码本不适合于低分辨率混合预编码。在本文中，我们设计了一种用于低分辨率混合预编码的基于角度的码本，其中，模拟码本是基于信道离开角（AoDs）设计的，而数字码本是通过随机矢量量化（RVQ）设计的。由于角度相干时间比信道相干时间长得多，因此从模拟码本中选择的模拟码字在更长的时间范围内保持不变。因此，可以显着减少信道反馈开销。仿真结果表明，所提出的码本具有较低的信道反馈开销，能够达到可接受的和速率性能。

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