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We consider a wireless relay network with multiple antenna terminals overRayleigh fading channels, and apply distributed space-time coding (DSTC) inamplify-and-forward (A&F) mode. The A&F scheme is used in a way that each relaytransmits a scaled version of the linear combination of the received symbols.It turns out that, combined with power allocation in the relays, A&F DSTCresults in an opportunistic relaying scheme, in which only the best relay isselected to retransmit the source's space-time coded signal. Furthermore,assuming the knowledge of source-relay CSI at the source node, we design anefficient power allocation which outperforms uniform power allocation acrossthe source antennas. Next, assuming M-PSK or M-QAM modulations, we analyze theperformance of the proposed cooperative diversity transmission schemes in awireless relay networks with the multiple-antenna source and destination. Wederive the probability density function (PDF) of the received SNR at thedestination. Then, the PDF is used to determine the symbol error rate (SER) inRayleigh fading channels. We derived closed-form approximations of the averageSER in the high SNR scenario, from which we find the diversity order of systemRminfNs;Ndg, where R, Ns, and Nd are the number of the relays, source antennas,and destination antennas, respectively. Simulation results show that theproposed system obtain more than 6 dB gain in SNR over A&F MIMO DSTC for BER10^{-4}, when R = 2, Ns = 2, and Nd = 1.

Opportunistic Relaying for Space-Time Coded Cooperation with Multiple Antenna Terminals