RIS-Aided Physical Layer Security Improvement in Underlay Cognitive Radio Networks

TL;DR

This paper investigates how reconfigurable intelligent surfaces (RIS) can enhance security and reliability in underlay cognitive radio networks by deriving analytical expressions and verifying benefits through simulations.

Contribution

It introduces a RIS-assisted model that improves secondary network reliability and primary network security, with analytical expressions for key performance metrics.

Findings

RIS improves SN outage probability

RIS enhances PN secrecy capacity

Simulation confirms performance gains

Abstract

In this paper, a reconfigurable intelligent surface (RIS)-aided underlay cognitive radio network is investigated. An RIS is utilized to improve the secondary network (SN) reliability and robustness while simultaneously increasing the physical layer security of the primary network (PN). Toward this end, closedform expressions for the SN outage probability, PN secrecy outage probability, and PN probability of non-zero secrecy capacity are derived. To increase the eavesdropping signals of the PN, the eavesdropper uses two combining techniques, namely maximal ratio combining and selection combining. Furthermore, the advantages of the proposed system model are verified through numerical and simulation results.