A Reconfigurable Intelligent Surface Assisted Secure Communication Secrecy Performance Optimization Scheme
To improve the secrecy performance of a reconfigurable intelligent surface(RIS)-assisted secure communication system and overcome hardware impairments caused by the system transceiver,an optimization scheme based on hardware impairments for RIS-assisted secure communication is suggested.A multiple-input single-output scenario with multiple eavesdroppershas been considered.Consequently,by jointly optimizing the base station transmit beamforming and RIS phase shift beamforming under the maximum transmit power of the base station with RIS phase shift unit-mode constraints,the secure communication secrecy rate maximization schema is proposed.For the non-convexity and coupling of this optimization problem,an efficient algorithm based on alternating optimization and semidefinite relaxation to transform the original nonconvex optimization problem into two convex optimization sub-problemsis developed.and.Simulation results demonstrate that the proposed scheme can obtain higher secrecy rate in comparison with conventional secure communication beamforming scheme.
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