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The authors consider the two-way wireless relaying scenario shown with multiple antennas at the nodes, where data transfer takes place between the nodes A and B with the help of the relay R. It is assumed that all the three nodes operate in half-duplex mode, i.e., they cannot transmit and receive simultaneously in the same frequency band. They consider the De-Noise-and-Forward (DNF) protocol originally introduced in, which consists of the following two phases: the Multiple Access (MA) phase, during which A and B simultaneously transmit to R and the BroadCast (BC) phase during which R transmits to A and B.
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