Secrecy Performance Analysis of RIS-aided Communication System with Randomly Flying Eavesdroppers

TL;DR

This paper evaluates the secrecy performance of RIS-assisted communication systems with UAV eavesdroppers, deriving analytical expressions for SNR and secrecy capacity, and demonstrating the security benefits of RIS deployment.

Contribution

It provides the first analytical framework for secrecy performance in RIS systems with randomly flying UAV eavesdroppers, including closed-form expressions for ergodic secrecy capacity.

Findings

RIS deployment enhances security against UAV eavesdroppers.

Analytical and approximate expressions match simulation results.

Secrecy capacity is improved with multiple antennas at the BS.

Abstract

In this letter, we analyze the secrecy performance of a reconfigurable intelligent surface (RIS)-aided communication system with spatially random unmanned aerial vehicles (UAVs) acting as eavesdroppers. We consider the scenarios where the base station (BS) is equipped with single and multiple antennas.The signal-to-noise ratios (SNRs) of the legitimate user and the eavesdroppers are derived analytically and approximated through a computationally effective method. The ergodic secrecy capacity is approximated and derived in closed-form expressions.Simulation results validate the accuracy of the analytical and approximate expressions and show the security-enhanced effect of the deployment of the RIS.