Security enhancement of wireless networks with wireless-powered full-duplex relay and friendly jammer nodes

In this paper we propose an energy harvesting-based cooperative jamming and full-duplex relaying scheme to enhance the secrecy rate for wireless communication between a source node and a destination node, in the presence of an eavesdropper. To characterize the performance, we develop a mathematical analysis framework for instantaneous and average secrecy rates. We consider the practical interference limited scenario, and derive exact closed-form expressions for the cumulative distribution function of the signal-to-noise-plus-interference ratio (SNIR) at the destination and eavesdropper nodes. Accordingly, the asymptotic average secrecy rates are derived. We show that the proposed protocol improves the average secrecy rate of a wireless cooperative network substantially. However, the instantaneous secrecy rate performance gain is highly depend on the duration of energy harvesting, the amount of self-interference and the corresponding channels and positions of the nodes in the system.