Performance analysis of cognitive two-way AF relaying systems with wireless energy harvesting over Nakagami-m fading channels

Wireless energy harvesting (EH) is regarded as a promising energy supply alternative for energy-constrained wireless networks. In this paper, a new wireless EH protocol is proposed for an underlay cognitive radio (CR) network with multiple transceivers in a primary network (PN). Utilizing two-way amplify-and-forward (AF) relaying system as a secondary network (SN), both end-sources can harvest energy from relay. Closed-form expression for outage probability (OP) of this system is derived by considering CR interference temperature over independent and non-identically distributed (i.n.i.d.) Nakagami-m fading channels. To simplify our analysis, we consider the asymptotically low outage regime and derive the OP at high signal-to-noise-ratios (SNRs). The numerical results have demonstrated that the wireless EH, compared to the conventional scenarios, enhances the outage performance significantly.