Abstract
Cognitive radio networks with the provision of RF energy harvesting at secondary user (SU) nodes are expected to overcome the traditional limitations of wireless networks, i.e. bandwidth and energy. In this paper, we investigate a cooperative cognitive radio network where the primary user (PU) network consists of a primary transmitter-receiver (PT-PR) pair and the SU network consists of a secondary transmitter-receiver (ST-SR) pair. In absence of a direct communication link between PT and PR, the ST is used for relaying PT's signal to PR. In return of its relaying service to PT, ST is allowed to access the PU spectrum to enable its own transmission to SR. Besides, the PT is assumed to be powered by some green energy source, while the ST is considered to be driven by energy harvested from the reception of PT's signal. Assuming a time switching-based relaying protocols for RF energy harvesting at ST, closed form expressions for PU and SU outage probabilities are obtained. Moreover, simulation results are presented to validate our analytical results and illustrate the impacts for various system parameters on the PU and SU outage performances.
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