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In this paper, the authors present a forwarding strategy for bidirectional relaying channels in which Trellis-Coded Modulation (TCM) is employed. They focus on a DeNoise-and-Forward (DNF) protocol, which has two stages: Multiple Access (MA) and BroadCast (BC) stages. At the MA stage, two terminals simultaneously transmit TCM signals towards a relaying node. The relay maps the received signal into a discrete constellation, after which it is broadcasted to the terminals at the BC stage. They reveal that network coding cannot offer a reliable relaying for some specific channel conditions even if they fully optimize it. To overcome the issue, they introduce an improved Amplify-and-Forward (AF) scheme termed the Pseudo AF (PAF).
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