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An adaptive randomized distributed space-time coding (DSTC) scheme andalgorithms are proposed for two-hop cooperative MIMO networks. Linear minimummean square error (MMSE) receivers and an amplify-and-forward (AF) cooperationstrategy are considered. In the proposed DSTC scheme, a randomized matrixobtained by a feedback channel is employed to transform the space-time codedmatrix at the relay node. Linear MMSE expressions are devised to compute theparameters of the adaptive randomized matrix and the linear receive filter. Astochastic gradient algorithm is also developed to compute the parameters ofthe adaptive randomized matrix with reduced computational complexity. We alsoderive the upper bound of the error probability of a cooperative MIMO systememploying the randomized space-time coding scheme first. The simulation resultsshow that the proposed algorithms obtain significant performance gains ascompared to existing DSTC schemes.

Adaptive Randomized Distributed Space-Time Coding in Cooperative MIMO Relay Systems