Secrecy Performance Analysis of RIS-Aided Fluid Antenna Systems

TL;DR

This paper analyzes how fluid antenna systems combined with reconfigurable intelligent surfaces can improve the secrecy performance of wireless communications, providing analytical expressions and numerical results to demonstrate their effectiveness.

Contribution

It introduces a novel analysis of RIS-aided fluid antenna systems for secure communications, deriving new statistical models and secrecy outage probability expressions.

Findings

FAS and RIS significantly improve secrecy performance.

Derived analytical expressions for SNR distribution and SOP.

Numerical results confirm performance enhancements.

Abstract

This paper examines the impact of emerging fluid antenna systems (FAS) on reconfigurable intelligent surface (RIS)-aided secure communications. Specifically, we consider a classic wiretap channel, where a fixed-antenna transmitter sends confidential information to an FAS-equipped legitimate user with the help of an RIS, while an FAS-equipped eavesdropper attempts to decode the message. To evaluate the proposed wireless scenario, we first introduce the cumulative distribution function (CDF) and probability density function (PDF) of the signal-to-noise ratio (SNR) at each node, using the central limit theorem and the Gaussian copula function. We then derive a compact analytical expression for the secrecy outage probability (SOP). Our numerical results reveal how the incorporation of FAS and RIS can significantly enhance the performance of secure communications.