Unlocking FAS-RIS Security Analysis with Block-Correlation Model

TL;DR

This paper analyzes the security of fluid antenna system (FAS)-RIS communication using a block-correlation model, deriving key performance metrics and demonstrating superior security performance through simulations.

Contribution

It introduces a novel block-correlation model for FAS-RIS security analysis and derives approximate expressions for secrecy metrics.

Findings

FAS-RIS system outperforms others in security performance

Block-correlation model accurately predicts secrecy metrics

Simulation validates theoretical analysis

Abstract

In this letter, we investigate the security of fluid antenna system (FAS)-reconfigurable intelligent surfaces (RIS) communication systems. The base station (BS) employs a single fixed-position antenna, while both the legitimate receiver and the eavesdropper are equipped with fluid antennas. By utilizing the block-correlation model and the central limit theorem (CLT), we derive approximate expressions for the average secrecy capacity and secrecy outage probability (SOP). Our analysis, validated by simulation results, demonstrates the effectiveness of the block-correlation model in accurately assessing the security performance. Moreover, simulation results reveal that FAS-RIS system significantly outperforms other systems in terms of security, further underscoring its potential in secure communication applications.