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Communication over a wireless network with random connections

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3 Author(s)
Gowaikar, R. ; Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA ; Hochwald, B. ; Hassibi, B.

A network of nodes in which pairs communicate over a shared wireless medium is analyzed. We consider the maximum total aggregate traffic flow possible as given by the number of users multiplied by their data rate. The model in this paper differs substantially from the many existing approaches in that the channel connections in this network are entirely random: rather than being governed by geometry and a decay-versus-distance law, the strengths of the connections between nodes are drawn independently from a common distribution. Such a model is appropriate for environments where the first-order effect that governs the signal strength at a receiving node is a random event (such as the existence of an obstacle), rather than the distance from the transmitter. It is shown that the aggregate traffic flow as a function of the number of nodes n is a strong function of the channel distribution. In particular, for certain distributions the aggregate traffic flow is at least n/(logn)d for some d>0, which is significantly larger than the O(√n) results obtained for many geometric models. The results provide guidelines for the connectivity that is needed for large aggregate traffic. The relation between the proposed model and existing distance-based models is shown in some cases.

Published in:

Information Theory, IEEE Transactions on  (Volume:52 ,  Issue: 7 )

Date of Publication:

July 2006

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