Mixed RF/FSO Relaying Systems

In this chapter, we are focused on wireless optical communications utilizing in overcoming a connectivity gap between the backbone and last mile access networks. The outage performance of dual-hop amplify-and-forward (AF) relaying systems, composed of mixed radio frequency (RF)/free-space optical (FSO) links is presented, when the partial relay selection is considered based on outdated channel state information (CSI). We analyze an example when the RF link is subjected to Rayleigh fading, while the FSO link is affected by atmospheric turbulence, which results in the intensity fluctuations of the optical signal, following the Gamma–Gamma distribution with taking the pointing errors into account. Analytical expressions for the outage probability are presented. The effects of atmospheric turbulence strength, pointing errors standard deviation, number of relays and rank of selected relay, are observed, considering the effect of time correlation between current and outdated CSI of the source-relay channel.

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