Description: In this letter, we consider a half-duplex amplify-andforward two-way relaying network consisting of two sources with each having a single antenna and one relay having two antennas.
For such a system, a distributed orthogonal space-time block code (STBC) is proposed by making use of the Alamouti coding
scheme and jointly processing the signals the two antennas at the relay node. Such a code turns out to make the equivalent channel at each source node be a product of the two Alamouti
channels and thus, is called distributed concatenated Alamouti STBC.
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