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Scalability of UWB Cognitive Radio Networks with Interference Constraint

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3 Author(s)
Fan Zhang ; Huazhong Univ. of Sci. & Technol. Wuhan, Wuhan ; Guangxi Zhu ; Xiaoyun Kang

To achieve scalable wireless design utilizing Ultra- Wide-Band (UWB), cognitive radio, and hybrid network (ad-hoc with infrastructure such as AP, access point), we propose a cooperative interference adaptation method, where a node by sensing the frequency spectrum, can adapt its transmit power to maximize its throughput capacity under the aggregate interference constraint. By developing an AP-assisted percolation model from a hierarchy of hexagons, we analyzed the asymptotic per-node throughput and per- packet delay of this method, as the density of randomly distributed nodes in a unit disk grows. We find that a throughput-optimum density exists for a given fading coefficient and maximum transmit power, a result applicable to wireless Internet and sensor networks.

Published in:

Wireless and Mobile Communications, 2006. ICWMC '06. International Conference on

Date of Conference:

29-31 July 2006

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