RIS-assisted Physical Layer Security

TL;DR

This paper introduces a RIS-assisted wiretap channel model, deriving secrecy rates and optimizing security performance considering eavesdropper effects, with simulations demonstrating key factors influencing security.

Contribution

It presents a novel RIS-assisted physical layer security framework with a new secrecy rate derivation and an optimization algorithm for enhanced security.

Findings

Secrecy rate increases with transmit power and optimal RIS deployment.

Eavesdropper location and number significantly impact security performance.

The proposed algorithm effectively enhances physical layer security.

Abstract

We propose a reconfigurable intelligent surface (RIS)-assisted wiretap channel, where the RIS is strategically deployed to provide a spatial separation to the transmitter, and orthogonal combiners are employed at the legitimate receiver to extract the data streams from the direct and RIS-assisted links. Then we derive the achievable secrecy rate under semantic security for the RIS-assisted channel and design an algorithm for the secrecy rate optimization problem. The simulation results show the effects of total transmit power, the location and number of eavesdroppers on the security performance.