Achievable Throughput in Two-Scale Wireless Networks
Radhika Gowaikar, Babak Hassibi · IEEE Journal on Selected Areas in Communications · 2009
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 distancer, 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 withNnodes, we show that an aggregate throughput that is slightly sublinear inN, for instance, of the formN/log4Nis achievable. This offers a significant improvement over a throughput scaling behaviour ofO(√(N))that is obtained in other work.