Achievable Rate Analysis and Optimization of Double-RIS Assisted Spatially Correlated MIMO with Statistical CSI  

作　　者：Xu Kaizhe Guo Jiajia Zhang Jun Jin Shi Ma Shaodan 

机构地区：[1]Department of Communications and Networking,Xi’an Jiaotong-Liverpool University,Suzhou 215123,China [2]State Key Laboratory of Internet of Things for Smart City,University of Macao,Macao SAR,China [3]Jiangsu Key Laboratory of Wireless Communications,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [4]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China [5]State Key Laboratory of Internet of Things for Smart City and the Department of Electrical and Computer Engineering,University of Macao,Macao SAR,China

出　　处：《China Communications》2025年第1期139-157,共19页中国通信(英文版)

基　　金：supported in part by the Xi’an Jiaotong-Liverpool University(XJTLU)Research Development Fund(2024–2027)under Grant RDF-23-02-010;supported in part by the Guangdong Basic and Applied Basic Research Foundation under Grant 2023A1515110732;supported in part by the National Natural Science Foundation of China(NSFC)under Grant 62071247;supported in part by the Science and Technology Development Fund,Macao,China SAR under Grants 0087/2022/AFJ and 001/2024/SKL;in part by the National Natural Science Foundation of China under Grant 62261160650;in part by the Research Committee of University of Macao,Macao SAR,China under Grants MYRG-GRG2023-00116-FST-UMDF and MYRG2020-00095-FST;supported in part by the NSFC under Grant 62261160576 and 62301148;in part by the Fundamental Research Funds for the Central Universities under Grant 2242023K5003.

摘　　要：Reconfigurable intelligent surface(RIS)is a novel meta-material which can form a smart radio environment by dynamically altering reflection directions of the impinging electromagnetic waves.In the prior literature,the inter-RIS links which also contribute to the performance of the whole system are usually neglected when multiple RISs are deployed.In this paper we investigate a general double-RIS assisted multiple-input multiple-output(MIMO)wireless communication system under spatially correlated non line-of-sight propagation channels,where the cooperation of the double RISs is also considered.The design objective is to maximize the achievable ergodic rate based on full statistical channel state information(CSI).Specifically,we firstly present a closedform asymptotic expression for the achievable ergodic rate by utilizing replica method from statistical physics.Then a full statistical CSI-enabled optimal design is proposed which avoids high pilot training overhead compared to instantaneous CSI-enabled design.To further reduce the signal processing overhead and lower the complexity for practical realization,a common-phase scheme is proposed to design the double RISs.Simulation results show that the derived asymptotic ergodic rate is quite accurate even for small-sized antenna arrays.And the proposed optimization algorithm can achieve substantial gain at the expense of a low overhead and complexity.Furthermore,the cooperative double-RIS assisted MIMO framework is proven to achieve superior ergodic rate performance and high communication reliability under harsh propagation environment.

关 键 词：common reflection pattern double RISs large system analysis MIMO replica method 

分 类 号：TN929.5[电子电信—通信与信息系统]