The performance of a dual-hop amplify-and-forward (AF) relay system is studied with the ??th worst partial relay selection (PRS)\r\nprotocol under the joint impact of feedback delay and multiple cochannel interference (CCI) at the relay nodes. In our analysis,\r\nthe closed-formand asymptotic expressions of the outage probability are derived and the achievable coding gain and diversity gain\r\nof the system are accurately revealed. Further, based on the asymptotic analysis we propose a power allocation scheme, which can\r\nlead to SNR performance gains ofmore than 1 dB compared to the equal power allocation scheme. Finally,Monte-Carlo simulation\r\nresults are presented to verify the validity of our theoretical analysis.
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