Relay selection and outage analysis in cooperative cognitive radio networks with energy harvesting

Cooperative cognitive radio (CCR) is a novel paradigm for improving both radio spectrum efficiency and communication quality. However, for the CCR networks with energy harvesting, how to achieve specific relay selection is still an open issue. In this paper, we consider a CCR network with energy harvesting in which multiple secondary transmitters are able to harvest energy from the received signals to serve their own receivers and primary transmitters. Furthermore, we propose two relay selection schemes, i.e., single relay selection and multiple relay selection, by considering harvested energy and analyze the outage probability for both schemes over Nakagami-m fading channels. Simulation results validate our analysis on outage performance and compare the effects of the number of selected relays, energy harvesting ratio and transmission phase division ratios on two schemes in terms of outage probability. different parameters.