Secure Transmission Design for Virtual Antenna Array-Aided Device-to-Device Multicast Communications

This paper investigates the physical-layer security in a Virtual Antenna Array (VAA)-aided Device-to-Device Multicast (D2DM) communication system, where User Equipments (UEs) who cache common content will form VAA system and cooperatively multicast to UEs desire it. Specifically, with target of securing VAA-aided D2DM under threat multiple eavesdroppers, we propose secure beamforming scheme by jointly considering formed Base Station (BS). For obtaining optimal beamforing vectors, nonsmooth nonconvex Weight Sum Rate Maximization Problem (WRMP) is formulated solved using Successive Convex Approximation (SCA) approach. Furthermore, consider worst case that eavesdroppers eavesdrop enhance overhearing capacity. In case, modify scheme, formulate corresponding WRMP solve it two-level optimization. Simulation results validate improvements terms compared conventional schemes.