Hybrid Precoder and Combiner Design With Low-Resolution Phase Shifters in mmWave MIMO Systems
Hybrid Precoder and Combiner Design With Low-Resolution Phase Shifters in mmWave MIMO Systems
复制标题
毫米波 MIMO 系统中具有低分辨率移相器的混合预编码器和组合器设计
DOI：
10.1109/jstsp.2018.2819129
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发表时间：
2017-10
影响因子：
7.5
通讯作者：
Swindlehurst A Lee
中科院分区：
文献类型：
--
作者：
Wang Zihuan;Li Ming;Liu Qian;Swindlehurst A Lee
毫米波（mmWave）通信已经被认为是下一代蜂窝系统和Wi-Fi网络的关键技术，因为其在提供比当前无线网络宽的数量级的带宽方面的进步。为了克服毫米波信道的严重传播损耗，经常针对毫米波大规模多输入多输出（MIMO）系统提出经济且节能的模拟/数字混合预编码和组合收发器。现有的解决方案的一个主要缺点在于假设无限或高分辨率的移相器（PS）来实现模拟波束形成器。然而，在实践中通常采用低分辨率PS以降低硬件成本和功耗。受此启发，在本文中，我们研究了毫米波MIMO系统中具有低分辨率PS的混合预编码器和组合器的实际设计。特别是，我们提出了一种迭代算法，连续设计的低分辨率模拟预编码器和组合器对，旨在有条件地最大化频谱效率。然后，基于所获得的有效基带信道来计算数字预编码器和组合器，以进一步提高频谱效率。在努力实现一个更硬件高效的大型天线阵列，我们还研究了一位分辨率（二进制）PS的混合波束形成器的设计，并提出了一种新的二进制模拟预编码器和组合器的优化算法。在分析计算复杂度后，将所提出的低分辨率混合波束形成设计进一步扩展到多用户MIMO通信系统。仿真结果表明，所提出的算法相比现有的低分辨率混合波束成形设计的性能优势，特别是对于一位分辨率PS的情况下。
Millimeter-wave (mmWave) communications have been considered as a key technology for next-generation cellular systems and Wi-Fi networks because of its advances in providing orders-of-magnitude wider bandwidth than current wireless networks. Economical and energy-efficient analog/digital hybrid precoding and combining transceivers have been often proposed for mmWave massive multiple-input multiple-output (MIMO) systems to overcome the severe propagation loss of mmWave channels. One major shortcoming of existing solutions lies in the assumption of infinite or high-resolution phase shifters (PSs) to realize the analog beamformers. However, low-resolution PSs are typically adopted in practice to reduce the hardware cost and power consumption. Motivated by this fact, in this paper, we investigate the practical design of hybrid precoders and combiners with low-resolution PSs in mmWave MIMO systems. In particular, we propose an iterative algorithm which successively designs the low-resolution analog precoder and combiner pair, aiming at conditionally maximizing the spectral efficiency. Then, the digital precoder and combiner are computed based on the obtained effective baseband channel to further enhance the spectral efficiency. In an effort to achieve an even more hardware-efficient large antenna array, we also investigate the design of hybrid beamformers with one-bit resolution (binary) PSs, and present a novel binary analog precoder and combiner optimization algorithm. After analyzing the computational complexity, the proposed low-resolution hybrid beamforming design is further extended to multiuser MIMO communication systems. Simulation results demonstrate the performance advantages of the proposed algorithms compared to existing low-resolution hybrid beamforming designs, particularly for the one-bit resolution PSs scenario.
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