Achievable throughput in two-scale wireless networks

  • Authors:
  • Radhika Gowaikar;Babak Hassibi

  • Affiliations:
  • Qualcomm Incorporated;California Institute of Technology

  • Venue:
  • IEEE Journal on Selected Areas in Communications - Special issue on stochastic geometry and random graphs for the analysis and designof wireless networks
  • Year:
  • 2009

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Abstract

We propose a new model of wireless networks which we refer to as "two-scale networks." At a local scale, characterised by nodes being within a distance r, channel strengths are drawn independently and identically from a distance-independent distribution. At a global scale, characterised by nodes being further apart from each other than a distance r, channel connections are governed by a Rayleigh distribution, with the power satisfying a distance-based decay law. Thus, at a local scale, channel strengths are determined primarily by random effects such as obstacles and scatterers whereas at the global scale channel strengths depend on distance. For such networks, we propose a hybrid communications scheme, combining elements of distance-dependent networks and random networks. For particular classes of two-scale networks with N nodes, we show that an aggregate throughput that is slightly sublinear in N, for instance, of the form N/log4 N is achievable. This offers a significant improvement over a throughput scaling behaviour of O(√N) that is obtained in other work.