Secure Precoding Via Interference Exploitation in Integrated Sensing and Communication System

In this letter, a secure integrated sensing and communication (ISAC) system enhanced by interference exploitation is investigated. We aim to minimize the mean square error (MSE) between the desired beampattern while ensuring the communication performance and security performance for legitimate users. To achieve this goal, the transmitted waveform is designed based on constructive interference (CI), while destructive interference (DI) is intended for the eavesdropping target. We employ the alternating minimization (AltMin) algorithm and alternating direction method of multipliers (ADMM) algorithm to convert the original non-convex problem into a series of solvable subproblems. The simulation results confirm the superior performance of the proposed design scheme compared to existing baseline schemes.