Joint Reflecting and Precoding Designs for SER Minimization in Reconfigurable Intelligent Surfaces Assisted MIMO Systems
Joint Reflecting and Precoding Designs for SER Minimization in Reconfigurable Intelligent Surfaces Assisted MIMO Systems
复制标题
可重构智能表面辅助 MIMO 系统中 SER 最小化的联合反射和预编码设计
DOI：
10.1109/twc.2020.2994455
复制
发表时间：
2020-08-01
影响因子：
10.4
通讯作者：
Alouini, Mohamed-Slim
中科院分区：
文献类型：
--
作者：
Ye, Jia;Guo, Shuaishuai;Alouini, Mohamed-Slim
本文研究了使用可重构智能表面 (RIS) 来辅助点对点多数据流多输入多输出 (MIMO) 无线通信。通过实际的有限字母输入，RIS 处的反射元件和发射器处的预编码器交替进行优化，以最大限度地降低符号错误率 (MSER)。在固定预编码器的反射优化中，开发了两种反射设计方法，称为eMSER-Reflecting和vMSER-Reflecting。在具有固定反射模式的预编码矩阵的优化中，矩阵优化被转化为向量优化问题，并提出了两种方法来解决它，即MSER预编码和MMED预编码。通过模拟研究了所提出的设计的优越性。仿真结果表明，假设复杂的高斯输入，所提出的反射和预编码设计可以提供比现有设计更低的 SER。此外，我们在 SER 方面将 RIS 与全双工放大转发（AF）中继系统进行比较，以显示 RIS 的优势。
This paper investigates the use of a reconfigurable intelligent surface (RIS) to aid point-to-point multi-data-stream multiple-input multiple-output (MIMO) wireless communications. With practical finite alphabet input, the reflecting elements at the RIS and the precoder at the transmitter are alternatively optimized to minimize the symbol error rate (MSER). In the reflecting optimization with a fixed precoder, two reflecting design methods are developed, referred as eMSER-Reflecting and vMSER-Reflecting. In the optimization of the precoding matrix with a fixed reflecting pattern, the matrix optimization is transformed to be a vector optimization problem and two methods are proposed to solve it, which are referred as MSER-Precoding and MMED-Precoding. The superiority of the proposed designs is investigated by simulations. Simulation results demonstrate that the proposed reflecting and precoding designs can offer a lower SER than existing designs with the assumption of complex Gaussian input. Moreover, we compare RIS with a full-duplex Amplify-and-Forward (AF) relay system in terms of SER to show the advantage of RIS.