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This paper addresses the problem that designing the transmit waveform andreceive beamformer aims to maximize the receive radar SINR for securedual-functional radar-communication (DFRC) systems, where the undesiredmulti-user interference (MUI) is transformed to useful power. In this system,the DFRC base station (BS) serves communication users (CUs) and detects thetarget simultaneously, where the radar target is regarded to be malicious sinceit might eavesdrop the transmitted information from BS to CUs. Inspired by theconstructive interference (CI) approach, the phases of received signals at CUsare rotated into the relaxed decision region, and the undesired MUI is designedto contribute in useful power. Then, the convex approximation method (SCA) isadopted to tackle the optimization problem. Finally, numerical results aregiven to validate the effectiveness of the proposed method, which shows that itis viable to ensure the communication data secure adopting the techniques thatwe propose.

Secure Dual-Functional Radar-Communication System via Exploiting Known Interference in the Presence of Clutter