多可重构智能表面辅助通信系统的性能研究

Research on Performance of Multi-reconfigurable Intelligent Surface Assisted Communication System

可重构智能表面(Reconfigurable Intelligent Surfaces,RIS)能通过软件智能控制超材料阵列的离散相移来改善通信环境、提高接收信号的强度。但仅依靠单个RIS辅助的系统可能无法为无线通信提供良好的视线链路。为了满足未来无线通信高可靠、高速率的需求,在Nakagami-m衰落信道下,研究了多RIS辅助直射链路和反射链路组合的通信系统的性能。利用矩生成函数的方法推导出目标节点误码率的解析表达式,给出了误码率上界以及遍历速率上界表达式,并探讨了衰落参数对系统性能的影响。通过蒙特卡罗仿真验证了分析结果的正确性。仿真结果表明,多RIS辅助通信系统在误码率和遍历速率方面明显优于单RIS辅助通信系统,且部署灵活。

Reconfigurable Intelligent Surfaces(RIS)can improve the communication environment and increase received signal strength by software-controlled intelligently discrete phase shifts of metamaterial arrays.However,the system relying on the assistance of only a single RIS may not be able to provide a good line-of-sight link for wireless communication.In order to meet the requirements of high reliability and high speed of wireless communication in the future,the system performance obtained by combing the multi-RIS assisted reflection link with the direct link is studied under the Nakagami-m fading channel.The analytical expression of the target node′s bit error rate is derived by the method of moment generating function,and the upper bound of the bit error rate and the upper bound of the ergodic rate are given,and the influence of the fading parameters on the system performance is discussed.The correctness of the analysis results is verified by Monte Carlo simulation.The simulation results show that the multi-RIS assisted communication system is significantly better than the single RIS assisted communication system in terms of bit error rate and ergodic rate,and it also has the flexibility of deployment.