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In a distributed space-time coding scheme, based on the relay channel model, the relay nodes co-operate to linearly process the transmitted signal from the source and forward them to the destination such that the signal at the destination appears as a space time block code. Recently, a code design criteria for achieving full diversity in a partially-coherent environment, wherein the destination has the knowledge of channels from the relays to itself, but not the channels from the source to the relays, have been proposed along with codes based on differential encoding and decoding techniques.
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