  In mobile communication system, due to the limitations of mobile device such
as low power supply as well as small size, most of the processing should be
done at the Base Station. Using multi-receive structure at the Base Station
really helps better recovery of the original signal by combining different
received signals. In this paper, for the first time, receive diversity is used
in single-hop hybrid Free Space Optical / Radio Frequency (FSO / RF)
communication system. Also it is the first time that a single-hop hybrid FSO /
RF system is investigated at saturate atmospheric turbulence regime. For the
first time, closed-form expression is derived for Outage Probability of the
proposed system and verified through MATLAB simulation. Results indicate a
significant improvement in the performance of the proposed structure compared
with common FSO and RF systems with receive diversity. Therefore it can be
concluded that although the proposed structure requires a complex receiver, but
addition of this complexity could significantly reduce processing or power
consumption required for performance maintenance of the system.
