Cooperative spectrum sensing in RF-powered full-duplex cognitive radio networks

Abstract

In this paper, we consider RF energy harvesting full-duplex (FD) cognitive radio networks (CRNs) which employs cooperative spectrum sensing (CSS) to improve the sensing performance. Equipped with three antennas, secondary users (SUs) in the network can conduct CSS, access to the spectrum opportunistically and harvest RF energy simultaneously. Analytical energy efficiency (EE) and harvesting efficiency (HE) are analyzed for the proposed cooperative RF-powered FD CRNs and a comparison with non-cooperative scenario is provided to measure the performance of our proposed scheme. Both theoretical and simulation results show that there exists a tradeoff between SU's transmit power and its EE, which means an optimal transmit power can be obtained for maximizing the EE. In addition, results indicate that the HE is a monotone increasing function of SU's transmit power.