Relay selection with channel allocation for cognitive radio relay channels in CRN

This paper investigates cognitive radio network (CRN) performance through cooperative multiple cognitive radio relays and relay selection with channel allocation scheme. In one approach the overall end-to-end throughput (OEET) improves as the number of cognitive radio relays (CRRs) increases in CRN. In this approach, the OEET increases with the number of CRRs but at the cost of increased transmission power and overheads, so simple and practical approach is proposed for the relay selection from a set of M CRRs then the channel allocation is performed with this selected cognitive radio relay (CRR). This proposed relay selection scheme uses channel conditions of the cooperative links as a metric for selecting the best cognitive radio relay. Simulation results show that the best CRR selected through the proposed approach performs better than the single CRR, in both the cases of with and without channel allocation (CA). Simulation results are compared with channel allocation (CA) scheme presented in [1]. The selected best CRR gives better performance than single CRR when combined with the channel allocation scheme, i.e., first select the best CRR with proposed relay selection approach and then perform channel allocation.