Outage Behavior of DF Relaying in Dissimilar Rayleigh Fading Channels

We consider a Decoded-and-Forward (DF) cooperative relaying network without a direct link. We investigate the outage probability (OP) of cooperation systems with either a DF scheme or a Selective DF (S-DF) scheme when relay channels experience statistically different Rayleigh fading. In the case of the DF system, an upper and lower bound of the OP are established to show the asymptotic performance of the DF scheme. In the case of the S-DF network, we obtain a simple closed-form OP performance analysis for the S-DF system. Finally, simulation results are provided to verify and compare the performance of the above schemes.