Abstract
In this paper, we consider the data communication over asymmetric dual hop network having one radio frequency (RF) hop followed by a free space optical (FSO) hop. The communication between a single antenna based RF transmitter and a single aperture based optical receiver is assisted by a decode-and-forward (DF) based dual-input dual-output (DIDO) relay, which possesses RF/FSO capabilities. We have assumed the Generalized-K (KG) distribution for irradiance fluctuations of FSO links and Nakagami-m distribution for channel coefficients of RF links. The KG distribution is a generic statistical model which has been used for a wide range of atmospheric turbulence induced fading in FSO communications. For independent and identically distributed (i.i.d.) links of the two hops, we derive the closed-form expression of average error probability (AEP) by utilizing maximal ratio combining (MRC) (for RF reception) and repetition coding (for FSO transmission) at relay node. Moreover, we analyze the outage performance of the considered mixed RF/FSO communication system. Further, we perform the asymptotic analysis of the system under consideration and derive the expressions for asymptotic AEP and asymptotic outage probability (AOP) at high signal-to-noise ratio (SNR) conditions. The analytically obtained results are verified through simulations.
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