Partial Relay Selection with Feedback Delay in an AF Cooperative Relaying RF-FSO System with Spectrum Sharing

In this paper, the performance of a dual-hop selection relaying system with mixed radio frequency (RF)and free space optical (FSO)communications is evaluated under a feedback delay. The RF links are under Rayleigh fading and spectrum-sharing constraints while the FSO links are assumed to follow Gamma-Gamma distribution. A partial relay selection (PRS)scheme in an amplify-and-forward (AF)cooperative relaying with variable gain relaying is considered, and the performance of the system is evaluated and compared under different parameters. Simulation results are presented for the outage probability, average BER, and average capacity of the considered system.