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The authors investigate modulation schemes optimized for two-way wireless relaying systems, for which network coding is employed at the physical layer. They consider network coding based on DeNoise-and-Forward (DNF) protocol, which consists of two stages: Multiple Access (MA) stage, where two terminals transmit simultaneously towards a relay, and BroadCast (BC) stage, where the relay transmits towards the both terminals. They introduce the design principles of modulation and network coding, suited for the BC stage by considering the superposed constellations during the MA stage.
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