Secure Beamforming for ISAC Systems Under Communication Eavesdropper and Sensing Eavesdropper
For ISAC system designers, this work provides a joint secure beamforming method against dual eavesdroppers, but the improvement is incremental over existing PLS techniques.
The paper addresses physical layer security in ISAC systems under both communication and sensing eavesdroppers, maximizing secrecy rate via transmit beamforming. Simulations show the proposed scheme outperforms benchmarks, though no concrete numbers are provided.
Due to great efficiency improvement in resource and hardware space, integrated sensing and communication (ISAC) has gained much attention. In the paper, the physical layer security (PLS) of ISAC system under communication eavesdropper together with sensing eavesdropper is investigated. The system secrecy rate is maximized by transmit beamforming design of communication and sensing signals when taking sensing security, sensing performance and transmit power constraint into consideration. To deal with the formulated non-convex optimization problem, the successive convex approximation (SCA) together with the first-order Taylor expansion and semidefinite relaxation (SDR) is utilized. Additionally, it is theoretically validated that the SDR does not yield sub-optimality in the paper. Thereafter, an iterated joint secure beamforming algorithm against communication and sensing eavesdroppers is proposed. Simulation results validate the effectiveness and advance of the proposed scheme.