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This letter analyzes the performance of simultaneous wirelessinformation-and-power transfer (SWIPT) in an overlay cognitive radio network(CRN) under Nakagami-$m$ fading. A pair of secondary users (SUs) is consideredin which one SU facilitates relay cooperation for communications between twoprimary users (PUs). In return, SUs make use of primary users' signals forenergy harvesting (EH) and realize their own communications. In such a network,end-to-end bidirectional communications between the two PUs and unidirectionalinformation exchange between the SUs can be performed in three phases. A powersplitting (PS) based approach is adopted for enabling SWIPT. The relaying SUapplies an amplify-and-forward (AF) protocol to broadcast primary and secondarysignals, whereas the PUs perform selection combining to access the activedirect link. Accurate expressions of the outage probability (OP) and throughputare derived for the primary system by considering a nonlinear energy harvesterat the relaying SU under Nakagami-m fading

Performance of Wireless Powered Cognitive Radio Sensor Networks With Nonlinear Energy Harvester