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In this paper, the secure performance of multiuser multiple-inputsingle-output wireless communications systems assisted by a multifunctionalactive intelligent reflection surface (IRS) is investigated. The active IRS cansimultaneously reflect and amplify the incident signals and emit artificialnoise to combat potential wiretapping. We minimize the total system powerconsumption by designing the phase, amplitude, and IRS mode selection of theactive IRS elements, as well as the precoder and artificial noise vector of thebase station (BS). The design is formulated as a non-convex optimizationproblem guaranteeing communication security. To tackle the problem, this paperproposes an iterative alternating algorithm to obtain an effective sub-optimalsolution. The simulation results show that the proposed scheme offers superiorsecure performance over all the considered baseline schemes, especially whenthe number of eavesdropper antennas is more than that of the BS.

Secure Communication in Multifunctional Active Intelligent Reflection Surface-assisted Systems