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For point to point multiple input multiple output systems,Dayal-Brehler-Varanasi have proved that training codes achieve the samediversity order as that of the underlying coherent space time block code (STBC)if a simple minimum mean squared error estimate of the channel formed using thetraining part is employed for coherent detection of the underlying STBC. Inthis letter, a similar strategy involving a combination of training, channelestimation and detection in conjunction with existing coherent distributedSTBCs is proposed for noncoherent communication in AF relay networks.Simulation results show that the proposed simple strategy outperformsdistributed differential space-time coding for AF relay networks. Finally, theproposed strategy is extended to asynchronous relay networks using orthogonalfrequency division multiplexing.

Leveraging Coherent Distributed Space-Time Codes for Noncoherent Communication in Relay Networks via Training