Performance analysis in wireless-powered cooperative cognitive radio vehicular network

An overlay cognitive radio network is investigated in this paper, which permits two wireless-powered secondary vehicles to communicate bidirectionally. Primary communication is achieved through direct link and relay cooperation from secondary vehicles. Herein, a hybrid simultaneous wireless information and power transfer (SWIPT) strategy is proposed, which can apply power-splitting and time-switching protocols adaptively. Specifically, selection combining is executed at primary receiver to obtain signals, and amplify- and-forward operation is performed at secondary vehicles. To explore performance of the proposed strategy in the vehicular network, exact outage probability expressions are derived under Nakagami-m fading as well as total energy efficiency. Simulations are presented to highlight impact of critical parameters on system performance.