RIS选优辅助的协作中继通信系统性能研究  

Research on Performance of Cooperative Relay Communication System in RIS Selection

作　　者：任静 岳殿武[1,2] 陈迎新 孙玉 白舒扬 REN Jing;YUE Dianwu;CHEN Yingxin;SUN Yu;BAI Shuyang(School of Information Science and Technology,Dalian Maritime University,Dalian 116026,China;State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China)

机构地区：[1]大连海事大学信息科学技术学院,辽宁大连116026 [2]东南大学毫米波国家重点实验室,江苏南京210096

出　　处：《无线电工程》2022年第12期2156-2162,共7页Radio Engineering

基　　金：国家自然科学基金(61971081);毫米波国家重点实验室开放课题基金资助项目(K202208)。

摘　　要：可重构智能表面(Reconfigurable Intelligent Surface,RIS)由于可以智能控制传输环境,动态改变反射信号的幅度相位,有效增强无线通信性能,引起了广泛关注。为了使RIS和中继各取所长,在独立不同分布的Nakagami-m衰落信道下,考虑了多个RIS选择最优进行辅助的解码转发协作中继通信系统。在RIS最优选择方案中,不考虑基站到用户的直射链路,仅对RIS参与反射的链路进行最优选择。推导RIS选优方案下系统中断概率和遍历速率的闭式表达式,并基于这些表达式进行性能分析。蒙特卡罗仿真验证了推导公式的正确性。仿真结果表明,在中断概率和遍历速率方面,RIS选优方案相比只有中继或只有RIS辅助下传输方案性能更好。Reconfigurable Intelligent Surface(RIS)has attracted extensive attention because it can intelligently control the transmission environment,dynamically change the amplitude and phase of reflected signals,and effectively enhance the performance of wireless communication.In order to make RIS and relay have their own advantages,in Nakagami-m fading channels with independent and different distribution,multiple RISs are considered to select the optimal decoding and forwarding cooperative relay communication system for assistance.In the RIS optimal selection scheme,the direct link from the base station to the user is not considered,and only the link in which RIS participates in reflection is optimally selected.The closed form expressions of system outage probability and ergodic rate under RIS optimization scheme are derived,and the performance is analyzed based on these expressions.Monte Carlo simulation verifies the correctness of the derived formula.The simulation results show that in terms of outage probability and ergodic rate,the RIS optimization scheme has better performance than the transmission scheme with only relay or RIS assistance.

关 键 词：可重构智能表面 解码转发中继 NAKAGAMI-M衰落信道 中断概率 遍历速率 

分 类 号：TN925.2[电子电信—通信与信息系统]