Physical layer security in D2D-enabled cellular networks: Artificial noise assisted

In this paper, we consider the secure communication of the cellular downlink between the base station and the cellular user underlaying D2D communication. Base stations, cellular users, D2D transmitters and eavesdroppers are modeled as the independent homogeneous Poisson point processes (PPPs). We consider a worst case in which each base station has no channel state information (CSI) from D2D transmitters which are generally deployed in the cell edge. In order to guarantee the secure transmission for cellular links, each multi-antenna base station employs the artificial noise assisted transmission strategy to keep the confidential message from being intercepted by the malicious eavesdropper having the multi-user decedability. Firstly, we derive the secrecy outage probability for the typical cellular link in the interference-limited network in which the additive noise is neglected. Then, the connection outage probability for the typical D2D link in the hybrid network is derived and some comprehensive analysis are presented. Finally, Finally, simulation results are provided to validate the effectiveness of theoretical analysis.