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The idea of space-time coding devised for multiple-antenna systems is applied to the problem of communication over a wireless relay network, a strategy called distributed space-time coding, to achieve the cooperative diversity provided by antennas of the relay nodes. In this paper, we extend the idea of distributed space-time coding to wireless relay networks with multiple-antenna nodes and fading channels. We show that for a wireless relay network with M antennas at the transmit node, N antennas at the receive node, and a total of Ã¢Â„Â›  antennas at all the relay nodes, provided that the coherence interval is long enough, the high SNR pairwise error probability (PEP) behaves as (1/P)min{M,N}Ã¢Â„Â› if MÃ¢Â‰Â N and (log1/MP/P)Ã¢Â„Â³Ã¢Â„Â› if M=N, where P is the total power consumed by the network. Therefore, for the case of MÃ¢Â‰Â N, distributed space-time coding achieves the maximal diversity. For the case of M=N, the penalty is a factor of log1/MP which, compared to  P, becomes negligible when  P is very high

Diversity Analysis of Distributed Space-Time Codes in Relay Networks with Multiple Transmit/Receive Antennas