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All spectrum opportunities are not created equally. The diverse behavior of different primary users (PUs) in various spectrum bands affects a cognitive radio's ability to exploit spectrum holes. In a heavily used spectrum environment, the availability of unutilized, uncluttered, and easily accessible white space spectrum is unlikely. Rather, cognitive radios must explore the gray spectrum, those bands...
In this paper the feasibility of femtocells partially reusing GSM spectrum is investigated. Due to the increasing scarcity and cost of spectrum, partial spectrum reuse by secondary networks is being considered to improve spectral efficiency. Additionally, new revenue streams can be extracted from existing resources by utilising partial spectrum reuse. The partial reuse of spectrum depends largely...
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