Secure Beamforming and Reflection Design for RIS-ISAC Systems Under Collusion of Passive and Active Eavesdroppers

TL;DR

This paper develops a joint beamforming and reflection design algorithm for RIS-ISAC systems to maximize secrecy rate against colluding passive and active eavesdroppers, ensuring secure communication and sensing performance.

Contribution

It introduces an iterative joint beamforming and reflection design algorithm using AO, quadratic penalty, and SCA for secure RIS-ISAC systems with colluding eavesdroppers.

Findings

The proposed JBRD algorithm effectively enhances secrecy rate.

Numerical results show the algorithm's superiority over existing methods.

Abstract

In the paper, the physical-layer security for reconfigurable intelligent surface (RIS) aided integrated sensing and communication (ISAC) system is studied. There is an active eavesdropper (AE) as well as a passive eavesdropper (PE), and they cooperate each other. By joint base station beamforming and RIS reflection design, we aim to achieve the best secure data communications with guaranteed sensing performance. Mathematically, taking the constraints on sensing performance and transmission power in consideration, the system secrecy rate maximization problem is formulated with respect to transmit beamforming, RIS reflection, and receive beamforming. The formulated problem is non-convex and is decomposed to three subproblems by applying the alternating optimization (AO). For the decomposed subproblem, we utilize the quadratic penalty method and successive convex approximation (SCA) for the solution derivation. Thereafter, an iterative numerical algorithm, referred to as the joint beamforming and reflection design (JBRD) algorithm, is proposed. Finally, numerical results demonstrate the effectiveness and superiority of the proposed algorithm.