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Network coding, where relay nodes combine the information received from multiple flows rather than simply replicating and forwarding the received packets, has shown the promise of significantly improving system performance. In very recent work, researchers have presented methods for increasing system throughput by employing methods inspired by network coding to mix packets at the physical layer: Physical-layer Network Coding (PNC). A common example used to validate much of this work is that of two sources exchanging information through a single intervening relay - a situation that the authors denote the "Exchange channel".
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