论文标题
关于使用可重构智能表面的空间多路复用
On Spatial Multiplexing Using Reconfigurable Intelligent Surfaces
论文作者
论文摘要
我们考虑上行链路多用户方案，并研究可重构智能表面（RIS）的使用，以优化使用线性接收器时的空间多路复用性能。我们研究了问题的两种不同的公式，即最大化有效等级并最大化RIS增强通道的最小值。我们采用基于梯度的优化来解决这两个问题，并在使用线性接收器时可根据可实现的汇率比较解决方案。我们的结果表明，所提出的标准可用于优化RIS以获得具有良好特性的有效渠道，并在RIS的传播贡献了一小部分接收力的情况下，可以大大提高性能。
We consider an uplink multi-user scenario and investigate the use of reconfigurable intelligent surfaces (RIS) to optimize spatial multiplexing performance when a linear receiver is used. We study two different formulations of the problem, namely maximizing the effective rank and maximizing the minimum singular value of the RIS-augmented channel. We employ gradient-based optimization to solve the two problems and compare the solutions in terms of the sum-rate achievable when a linear receiver is used. Our results show that the proposed criteria can be used to optimize the RIS to obtain effective channels with favorable properties and drastically improve performance even when the propagation through the RIS contributes a small fraction of the received power.
