Secure Physical Layer Transmission Assisted by Intelligent Reflective

Abstract

Intelligent Reflecting Surface (IRS) consists of large-scale low-cost passive reflective elements that can reflect and change the base station beam by changing the phase of the reflective units, thus enhancing the security of the physical layer of wireless communications. In the communication system, we will use the security rate to compare the confidentiality performance of a certain transmission signal. In this paper, we study the optimization problem of maximizing the security rate, and propose an alternating iteration method to decompose the problem which has more dimensions and the parameters are coupled with each other, and then design a suitable solution for each phase. Simulation results show a reduction in complexity and a greater advantage in the performance of the designed algorithm.