Dynamic Hybrid Beamforming With Low-Resolution PSs for Wideband mmWave MIMO-OFDM Systems
Dynamic Hybrid Beamforming With Low-Resolution PSs for Wideband mmWave MIMO-OFDM Systems
复制标题
用于宽带毫米波 MIMO-OFDM 系统的具有低分辨率 PS 的动态混合波束成形
DOI：
10.1109/jsac.2020.3000878
复制
发表时间：
2020-09-01
影响因子：
16.4
通讯作者：
Swindlehurst, A. Lee
中科院分区：
文献类型：
--
作者：
Li, Hongyu;Li, Ming;Swindlehurst, A. Lee
模拟/数字混合波束成形被认为是实现用于实现毫米波（mmWave）多输入多输出（MIMO）通信的多天线技术的关键，因为它可以减少昂贵且耗电的射频（RF）链的数量，同时仍然提供空间复用。在本文中，我们介绍了一种新的混合波束形成架构的动态天线子阵列和硬件高效的低分辨率移相器（PS）的宽带毫米波MIMO正交频分复用（MIMO-OFDM）系统。通过经由开关网络和PS将每个RF链动态地连接到非重叠天线子阵列，可以利用多天线分集来减轻由于采用实际的低分辨率PS而导致的性能损失。对于这种动态混合波束形成架构，我们联合设计的混合预编码器和组合器，以最大限度地提高毫米波MIMO-OFDM系统的平均频谱效率。特别地，频谱效率最大化问题首先被转换为均方误差（MSE）最小化问题。然后，基于经典的块协调下降（BCD）方法，提出了一种高效的迭代混合波束形成算法。文中还分析了算法的收敛性和复杂度。大量的仿真结果表明，所提出的动态子阵和低分辨率PS的混合波束形成算法的优越性。
Analog/digital hybrid beamforming is considered as a key enabling multiple antenna technology for implementing millimeter wave (mmWave) multiple-input multiple-output (MIMO) communications since it can reduce the number of costly and power-hungry radio frequency (RF) chains while still providing for spatial multiplexing. In this paper, we introduce a novel hybrid beamforming architecture with dynamic antenna subarrays and hardware-efficient low-resolution phase shifters (PSs) for a wideband mmWave MIMO orthogonal frequency division multiplexing (MIMO-OFDM) system. By dynamically connecting each RF chain to a non-overlapping antenna subarray via a switch network and PSs, multiple-antenna diversity can be exploited to mitigate the performance loss due to the employment of practical low-resolution PSs. For this dynamic hybrid beamforming architecture, we jointly design the hybrid precoder and combiner to maximize the average spectral efficiency of the mmWave MIMO-OFDM system. In particular, the spectral efficiency maximization problem is first converted to a mean square error (MSE) minimization problem. Then, an efficient iterative hybrid beamformer algorithm is developed based on classical block coordination descent (BCD) methods. An analysis of the convergence and complexity of the proposed algorithm is also provided. Extensive simulation results demonstrate the superiority of the proposed hybrid beamforming algorithm with dynamic subarrays and low-resolution PSs.