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Network coding in cooperative communications friend or foe


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Network coding in cooperative communications friend or foe

  1. 1. Network Coding in Cooperative Communications: Friend or FoeA major benefit of employing network coding (NC) in cooperative communications (CCs) is itsability to reduce time-slot overhead. Such approach is called network-coded CC (or NC-CC).Most of the existing works have mainly focused on exploiting this benefit without considering itspotential adverse effect. In this paper, we show that NC may not always benefit CC. Wesubstantiate this important finding with two important scenarios: employing analog networkcoding (ANC) in amplify-and-forward (AF) CC, and digital network coding (DNC) in decode-and-forward (DF) CC. For both scenarios, we introduce the important concept of network codingnoise (NC noise). We analyze the origin of this noise via a careful study of signal aggregation ata relay node and signal extraction at a destination node. We derive a closed-form expression forNC noise at each destination node and show that the existence of NC noise could diminish theadvantage of NC in CC. Our results shed new light on how to use NC in CC most effectively. Ambit lick Solutions Mail Id: , Ambitlicksolutions@gmail.Com