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In this paper, closed-form approximations for outage probability and symbol error rate are presented for a selective decode-and-forward relay network with partial channel information. An independent but not identically distributed Rayleigh fading environment is considered. Numerical and simulated results demonstrate the validity of the analytical results. Relay selection is an attractive method to improve the bandwidth efficiency of cooperative networks. Specifically, Bletsas and others proposed a distributed relay selection based on the channel information of both the first and second hops for each relay, showing that the diversity multiplexing tradeoff of relay selection is identical with that of distributed space-time coding.
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