Enhanced Physical Layer Security for RIS aided Wireless Network with Control Jammer and Power Allocation Scheme

Abstract

In this paper, the secrecy rate of reconfigurable intelligent surface (RIS) aided wireless networks with one eavesdropper around is investigated. In the system model, the source broadcasts the signal to the destination via an intermediate node RIS, and the controlling Jammer (CJ) near to the eavesdropper ensures physical layer security. Our major objective is to increase the secrecy rate by distributing power optimally between the source and the jammer. By using the Lagrange’s multiplier approach, we devised a power allocation strategy and found the optimum power distribution coefficient for distributing power between the source and the jammer. Our results demonstrate that the secrecy rate of the system model with controlling Jammer is superior to that of the system model with Jammer, the system model without Jammer and that the optimal distribution of power (ODP) has a higher secrecy rate than the equal distribution of power (EDP).