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Issue No.07 - July (2012 vol.11)
pp: 1073-1085
Sushant Sharma , Virginia Tech, Blacksburg
Yi Shi , Virginia Tech, Blacksburg
Jia Liu , Ohio State University, Columbus
Y. Thomas Hou , Virginia Tech, Blacksburg
Sastry Kompella , U.S. Naval Research Laboratory, Washington, DC
Scott F. Midkiff , Virginia Tech, Blacksbug
A major benefit of employing network coding (NC) in cooperative communications (CCs) is its ability 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 its potential adverse effect. In this paper, we show that NC may not always benefit CC. We substantiate this important finding with two important scenarios: employing analog network coding (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 coding noise (NC noise). We analyze the origin of this noise via a careful study of signal aggregation at a relay node and signal extraction at a destination node. We derive a closed-form expression for NC noise at each destination node and show that the existence of NC noise could diminish the advantage of NC in CC. Our results shed new light on how to use NC in CC most effectively.
Cooperative communications, network coding, network coding noise.
Sushant Sharma, Yi Shi, Jia Liu, Y. Thomas Hou, Sastry Kompella, Scott F. Midkiff, "Network Coding in Cooperative Communications: Friend or Foe?", IEEE Transactions on Mobile Computing, vol.11, no. 7, pp. 1073-1085, July 2012, doi:10.1109/TMC.2011.130
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