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In this paper, the authors consider a two-way relaying system with two sources A, B and one relay R, where the two sources desire to exchange information through the relay. The transmission consists of two states: Multiple ACcess (MAC) stage, where A and B transmit the channel-coded signals to R simultaneously, and BroadCast (BC) stage, where R transmits towards both A and B. One critical process at R is to decode the superimposed signal from A and B in such a way that A and B could decode the information from each other reliably at the BC stage.
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