Physical Layer Security of WPCNs With Imperfect CSI and Full-Duplex Receiver Aided Jamming

In this paper, we investigate the secrecy performance of wireless powered communication networks (WPCNs) faced by multiple passive eavesdroppers, where the full-duplex (FD) receiver utilizes the harvested energy to send the artificial jamming for enhancing the secrecy performance. Moreover, we adopt a practical maximal ratio transmission (MRT) scheme at the transmitter taking into account the impact of imperfect CSI to try to improve the transmission efficiency of the considered system. Specifically, in order to evaluate the proposed scheme, three important performance metrics, namely, connect outage probability (COP), secrecy outage probability (SOP), and secrecy throughput are adopted in this paper. Concretely, the exact and asymptotic expressions for COP, SOP, and secrecy throughput were derived to effectively analyze the impact of key parameters on the system performance more comprehensively. Through the simulation analysis, we can find that the proposed energy harvesting-based FD-aid jamming (EHFDJ) scheme can achieve better secrecy performance than the reduced half-duplex non-jamming (HDNJ) scheme under a relatively small self-interference.