Title: Effectiveness of Reconfigurable Intelligent Surface in Multipath Fading Channel Show Chinese title

Title: 可重构智能表面在多径衰落信道中的有效性

Abstract: A method of simulating a single-input single-output reconfigurable intelligent surface (RIS) assisted channel is presented using three channel black boxes to represent the direct signal path, the transmit path to the RIS and the reflected path from the RIS. The complex coefficients for each channel box is obtained by ray tracing in a scenario with geographic terrain information that also contains approximate building shapes. The electrical characteristics of the ground and building walls were also accounted for in the ray tracing function. Simulations were conducted with reflected rays only and reflected rays together with diffracted rays. The received power exhibits variations typical of multipath fading environments. In the best locations, the RIS-assisted channel simulation result agrees well with theoretical models, the performance increasing by the RIS size squared as the number of RIS elements is increased. In the simplified theoretical model where the transmitter and receiver are inline and the RIS orthogonal but much closer than the distance between the former elements, the simulation results also corroborate best deployment close the transmitter or the receiver with a U-shaped drop between them. Show Chinese abstract

Abstract: 使用三个信道黑盒来表示直射信号路径、发送到可重构智能表面（RIS）的路径以及从RIS反射的路径，提出了一种模拟单输入单输出可重构智能表面（RIS）辅助信道的方法。 每个信道框的复系数是通过在包含地理地形信息和近似建筑形状的场景中进行射线追踪获得的。 在射线追踪功能中也考虑了地面和建筑墙壁的电气特性。 模拟仅使用反射射线以及反射射线与衍射射线一起进行。 接收功率表现出多径衰落环境的典型变化。 在最佳位置，RIS辅助信道模拟结果与理论模型一致，随着RIS元件数量的增加，性能按RIS尺寸的平方增加。 在简化理论模型中，发射器和接收器成一直线，RIS正交但比前者的距离要近得多，模拟结果也证实了在发射器或接收器附近的最佳部署，它们之间呈U形下降。