Securing STAR-FC-RIS empowered integrated sensing and multiuser communications against target eavesdropping  

作　　者：Shuying LIN Yulong ZOU Fu XIAO Bin LI 

机构地区：[1]School of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [2]School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [3]Key Laboratory of Broadband Wireless Communication and Sensor Network Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China

出　　处：《Science China(Information Sciences)》2024年第11期331-342,共12页中国科学（信息科学）（英文版）

基　　金：supported in part by National Natural Science Foundation of China(Grant Nos.62271268,62071253,62371252);National Science Fund for Distinguished Young Scholars of China(Grant No.62125203);Jiangsu Provincial Key Research and Development Program(Grant No.BE2022800);Jiangsu Provincial 333 Talent Project;the Open Research Fund of Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications)(Grant No.JZNY202303)。

摘　　要：This paper investigates a simultaneous-transmitting-and-reflecting fully-connected reconfigurable intelligent surface(STAR-FC-RIS)empowered integrated sensing and multiuser communications(ISAMC)network,where a dual-functional radar-communication base station detects a malicious radar target nearby and communicates with multiple legitimate users on the other side of the STAR-RIS.We utilize an integrated architecture that combines the fully-connected(FC)-RIS,an emerging type of beyond-diagonal(BD)-RIS,with the time-switching(TS)-STAR-RIS to enhance both the sensing and communications at the cost of possible target intercepting and propose the simultaneous-transmitting-and-reflecting fully-connected RIS(STAR-FCR)schemes to strike a balance between sensing and communications performance.Thereafter,observing the security-reliability performance tradeoff of the downlink ISAMC,we conduct closed-form analyses to compare COPs of round-robin scheduling(RS)and multiuser scheduling(MS)with the aid of a TS-based STAR-FC-RIS.Furthermore,we derive closed-form expressions of the sensing outage probability,communications outage probability(COP),and communications intercept probability,where an average of the three probabilities is exploited to obtain an optimized time allocation(OTA)of the STAR-FC-RIS.Numerical results verify that the STAR-FCR-MS scheme outperforms the STAR-FCR-RS scheme in terms of sensing reliability and communications security.Moreover,an OTA remarkably enhances the overall performance of the STAR-FCR schemes of ISAMC systems.

关 键 词：simultaneous-transmitting-and-reflecting reconfigurable intelligent surface(RIS) fully-connected beyond-diagonal RIS integrated sensing and communications multiuser scheduling security 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN929.5[自动化与计算机技术—控制科学与工程]