IEEE Transactions on Wireless Communications
Asymptotic analysis of opportunistic relaying protocols
IEEE Transactions on Wireless Communications
Single and multiple relay selection schemes and their achievable diversity orders
IEEE Transactions on Wireless Communications
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Cooperative Communications with Outage-Optimal Opportunistic Relaying
IEEE Transactions on Wireless Communications
Performance analysis of single relay selection in rayleigh fading
IEEE Transactions on Wireless Communications
A simple Cooperative diversity method based on network path selection
IEEE Journal on Selected Areas in Communications
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In this paper, we study the outage performance of decode-and-forward (DF) opportunistic communication systems with the Nth best relay selection scheme under independent but not necessarily identical Rayleigh fading channels. In traditional opportunistic cooperation, only the best relay helps forward the source's messages to the destination. However, in practical systems, the best relay may be unavailable due to scheduling and overload problems. In this case, another suboptimal but available relay may be selected to participate in cooperation. Without loss of generality, we analyze the performance when the Nth best relay is selected to cooperate and take the availability of the direct link between the source and the destination into consideration. In particular, we derive the exact expression of outage probability for arbitrary signal-to-noise (SNR), then we obtain the closed-form expression in high SNR region. Through asymptotic analysis, the diversity order which reflects the effect of the direct link is obtained and it is linearly related with the number of relays and the selection criterion N. Simulation results are presented to verify the analysis.