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We study security solutions for dual-functional radar communication (DFRC)systems, which detect the radar target and communicate with downlink cellularusers in millimeter-wave (mmWave) wireless networks simultaneously. Uniquelyfor such scenarios, the radar target is regarded as a potential eavesdropperwhich might surveil the information sent from the base station (BS) tocommunication users (CUs), that is carried by the radar probing signal.Transmit waveform and receive beamforming are jointly designed to maximize thesignal-to-interference-plus-noise ratio (SINR) of the radar under the securityand power budget constraints. We apply a Directional Modulation (DM) approachto exploit constructive interference (CI), where the known multiuserinterference (MUI) can be exploited as a source of useful signal. Moreover, tofurther deteriorate the eavesdropping signal at the radar target, we utilizedestructive interference (DI) by pushing the received symbols at the targettowards the destructive region of the signal constellation. Our numericalresults verify the effectiveness of the proposed design showing a securetransmission with enhanced performance against benchmark DFRC techniques.

Secure Dual-Functional Radar-Communication Transmission: Exploiting Interference for Resilience Against Target Eavesdropping