不完美信道下STAR-RIS联合协作干扰辅助的鲁棒安全通信OA

Aiming at the issue of imperfect channel state information(CSI)caused by the passive nature of eavesdroppers,this paper introduces an external friendly jammer to degrade the quality of the eavesdropper channels and proposes a robust physical layer security optimization method for a downlink communication system with dual-sided single user and multiple eavesdroppers,assisted by a simultaneously transmitting and reflecting reconfigurable intelligent surface(STAR-RIS)and cooperative jamming.The objective is to maximize the system's sum secrecy rate(SSR)under the worst-case scenario,by jointly designing the beamforming vectors at the base station(BS)and the jammer,as well as the transmit/reflection coefficient matrix of the STAR-RIS.Since the formulated optimization problem is a non-convex problem with multiple coupled variables,an efficient iterative algorithm is developed by leveraging alternative optimization(AO),semidefinite relaxation(SDR),and the S-procedure to obtain a suboptimal solution.Simulation results demonstrate that the proposed robust scheme significantly enhances the secrecy performance of the system compared with baseline schemes.