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.
@article{arxiv.2408.14969,
title = {Secrecy Performance Analysis of RIS-Aided Fluid Antenna Systems},
author = {Farshad Rostami Ghadi and Kai-Kit Wong and Masoud Kaveh and F. Javier Lopez-Martinez and Wee Kiat New and Hao Xu},
journal= {arXiv preprint arXiv:2408.14969},
year = {2024}
}