Security enhancement for dual-hop RF protocols with Nth-best partial relay and EH-based jammer

In this paper, we propose an energy harvestingbased jamming scheme to enhance secrecy outage probability (SOP) for cooperative relaying protocols. In the proposed scheme, one of available relays is selected to forward data from a source to a destination, while an energy-constrained relay harvests energy from the source's radio frequency signals to generate artificial noise to an eavesdropper. Moreover, we consider a generalized relay selection scheme, in which the Nth-best relay is resorted to help the source-destination communication. We derive exact and asymptotic expressions of the SOP over Rayleigh fading channels. Monte-Carlo simulations are performed to verify the analysis results and confirm the advantage of the proposed scheme.