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This paper examines the information theoretic metric of outage probability for a Decode-and-Forward (DF) based asymmetric two-way relay transmission (i.e., the two source terminals have different target rates). The authors first characterize the achievable rate region of a conventional three-node network. After that the conventional three-node scenario is analyzed in terms of outage probability and the corresponding closed-from expressions are developed over Rayleigh fading channels. Moreover, in order to make a good use of the available diversity degrees of the channel, opportunistic relay selection are considered for multi-relay networks.
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