Linear Polarization Optimization for Wideband MIMO Systems With Reconfigurable Arrays
Linear Polarization Optimization for Wideband MIMO Systems With Reconfigurable Arrays
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DOI：
10.1109/twc.2023.3297130
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发表时间：
2024-03
影响因子：
10.4
通讯作者：
Miguel R. Castellanos;R. Heath
中科院分区：
文献类型：
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作者：
Miguel R. Castellanos;R. Heath
可重构阵列塑造传播环境，使无线系统受益。我们在宽带多输入多输出（MIMO）系统中使用单端口极化可重构天线，并证明了基于解析信道模型的重构技术的有效性。我们应用一个双向信道模型来表明，极化重新配置作为一个额外的预编码步骤上的非极化信道。我们使用詹森的不等式上限的频谱效率，并利用放松的目标，推导出封闭形式的表达式在每个天线的最佳极化角。我们还推导出上界的极化可重构系统的性能，并开发了一个有效的极化重构程序，旨在最大限度地提高这些上界。数值结果表明，所提出的简化方法在宽带MIMO环境中达到近最优。
Reconfigurable arrays mold the propagation environment to benefit wireless systems. We use single-port polarization-reconfigurable antennas in a wideband multiple-input multiple-output (MIMO) system and demonstrate the efficacy of reconfiguration techniques based on analytical channel models. We apply a double-directional channel model to show that polarization reconfiguration acts as an additional precoding step on an unpolarized channel. We use Jensen’s inequality to upper bound the spectral efficiency and leverage the relaxed objective to derive closed-form expressions for the optimal polarization angles at each antenna. We also derive upper bounds on the performance of a polarization reconfigurable system and develop an efficient procedure for polarization reconfiguration that aims to maximize these upper bounds. Numerical results show that the proposed simplified methods achieve near-optimal in wideband MIMO settings.