RSMA-Enhanced Physical Layer Security for ISAC Systems
Bo Zhao, Tian Qiu, Guangliang Ren, Zengwang Jin, Zhiqiang Liu
Abstract
In this letter, we enhance the physical layer security (PLS) of integrated sensing and communication (ISAC) systems using rate-splitting multiple access (RSMA). To ensure specific security requirements, we formulate a joint optimization problem that involves the precoding matrix and the common rate. The goal is to maximize the communication-sensing weighted secure sum rate (SSR), thereby enhancing the overall system performance while maintaining security. To solve the non-convex optimization problem, we adopt the staged algorithm named successive convex approximation with penalty (SCA-P) algorithm. Simulation results show that the proposed scheme has better security performance than the state-of-the-art schemes.