Performance analysis of a multi-antenna based cooperative relaying scheme over fading channels in spectrum sharing environment

This paper presents an outage analysis of a cooperative relaying scheme over flat Rayleigh and Nakagami-m fading channels. In the proposed scheme, secondary transmitters cooperatively relay the primary traffic. Each secondary transmitter, equipped with multiple antennas, is divided into one of the two clusters: a cooperative cluster (CC) and a non-cooperative cluster (NCC). Cluster head (CH) of the CC will be selected as a best decode-and-forward (DF) relay and will forward the primary information. Results show that the proposed scheme outperforms both non-cooperative, conventional single-antenna systems and random relay selection schemes in terms of outage probability. In each case, theoretical results are verified with Monte-Carlo simulation results.