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

TL;DR

This paper proposes a novel waveform and beamforming design for secure dual-functional radar-communication systems that exploits known interference and clutter to enhance security and performance.

Contribution

It introduces a constructive interference-based approach combined with convex optimization to improve security and efficiency in DFRC systems.

Findings

Enhanced radar SINR with secure communication

Effective use of known interference for security

Validation through numerical simulations

Abstract

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