论文标题
Terahertz通信系统的可重构智能表面中的动态子阵列结构
A Dynamic Subarray Structure in Reconfigurable Intelligent Surfaces for TeraHertz Communication Systems
论文作者
论文摘要
可重新配置的智能表面（RIS）已成为一种流行的技术，可以提高THZ多源多输入多输出（MIMO）通信系统的能力。另一方面，当使用均匀的平面阵列（UPA）天线时，THZ波的特性限制了RIS上的Thz梁覆盖率。在这项研究中，我们提出了动态的RIS子阵列结构，以提高THZ MIMO通信系统的性能。在更多详细信息中，根据用户数量将RIS分为几个RIS子阵列。每个RIS子阵列与用户配对，仅反映了相应用户的光束。根据RIS的结构，我们首先提出一个加权的最小均方误差-RIS局部搜索（WMMSE -LS）方案，该方案要求每个RIS元素具有有限的相移。为了提高联合波束形成性能，我们进一步开发了一种自适应块坐标下降（BCD）辅助算法，这是一种迭代优化方法。数值结果证明了动态RIS子阵列结构和适应性BCD辅助缔合方案的有效性，还显示了我们提出的系统的优点。
Reconfigurable Intelligent Surface (RIS) has become a popular technology to improve the capability of a THz multiuser Multi-input multi-output (MIMO) communication system. THz wave characteristics, on the other hand, restrict THz beam coverage on RIS when using a uniform planar array (UPA) antenna. In this study, we propose a dynamic RIS subarray structure to improve the performance of a THz MIMO communication system. In more details, an RIS is divided into several RIS subarrays according to the number of users. Each RIS subarray is paired with a user and only reflects beams to the corresponding user. Based on the structure of RIS, we first propose a weighted minimum mean square error - RIS local search (WMMSE-LS) scheme, which requires that each RIS element has limited phase shifts. To improve the joint beamforming performance, we further develop an adaptive Block Coordinate Descent(BCD)-aided algorithm, an iterative optimization method. Numerical results demonstrate the effectiveness of the dynamic RIS subarray structure and the adaptive BCD-aided joint beamforming scheme and also show the merit of our proposed system.
