Secure Transmit Beamforming for Radar-Communication Systems Using NOMA

This letter focuses on the physical layer security of dual-functional radar-communication (DFRC) systems and proposes a novel non-orthogonal multiple-access (NOMA)-based secure transmission beamforming method. The proposed method prevents eavesdropping by concealing the confidential information of the legitimate users in the radar beam, and the legitimate users can remove the interference by successive interference cancellation (SIC). We formulate the problem as a non-convex optimization problem and then decompose it into two sub-problems, where the first sub-problem enjoys a closed-form solution, and the other is solved iteratively. Numerical results verify the effectiveness of our method.