  In this paper, we investigate a dual-hop relaying system, composed of radio
frequency (RF) and free-space optical (FSO) link. Decode-and-forward (DF) relay
is employed to integrate the first RF link and the second line-of-sight FSO
links. The RF channel is assumed to be subject to recently proposed
Fisher-Snedecor fading model, which was shown to be convenient for modeling in
realistic wireless communication scenarios. The FSO channel is affected by
Gamma-Gamma distributed atmospheric turbulence. Expression for the outage
probability is derived and utilized to present numerical results. Based on
presented results, the effects of various RF and FSO channels parameters on the
overall system performance are examined and discussed.
