IRS-Aided Two-Way Secure Transmission with Artificial Noise against Eavesdropping
This paper investigates the secure transmission in an IRS-aided two-way system.Differ-ent from existing works,a general model with active eavesdropping and direct links between users is considered,and we devote to improve the worst-case sum secrecy rate(SSR)provided by the achiev-able secrecy rate region since it characterizes the two-way wiretapping system better.Artificial noise is exploited at the legitimate users due to its impact on worst-case SSR and a secure communi-cation scheme is then developed which jointly designs the phase shifts at the IRS and the AN power at each legitimate user.The corresponding optimization problem is solved by alternating optimiza-tion where the power allocation coefficients are given in closed-form and the phase shift vector is obtained by using semidefinite relaxation along with a novel Gaussian randomization method.Simu-lation results verify that the proposed scheme provides higher SSR than traditional schemes,indicat-ing the necessity of AN in such systems.
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