Performance Analysis of Multi-RIS Aided Communication Under Weibull Fading

Reconfigurable intelligent surface (RIS) is considered as a crucial technology for changing the propagation environment to enhance signal reception, extend coverage, and improve link quality. It can flexibly serve the massive Internet of Things (IoT) devices with low energy consumption. This paper focuses on a multi-RIS assisted communication system, where the channels are assumed to follow Weibull fading. The closed-form expressions of outage probability (OP), ergodic achievable rate (EAR) as well as average symbol error probability (SEP) are provided, respectively. It is worthy noting that all the analytical results are suitable for arbitrary system parameters such as the number of elements on RIS, topological structure, transmit power, etc. Simulation results show that the multi-RIS assistance has a significant improvement on the system performance.