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Cognitive radio is an emerging and fascinating technology for the opportunistic use of under-utilized spectrum that promises to change the future technological trends forever if employed properly. This work focuses on the practical implementation of a cognitive radio network. The electromagnetic radio spectrum is a licensed resource which is carefully managed by governments to ensure secure and reliable wireless communication. Today the radio spectrum is managed in a way that a wireless service provider buys the license for one or more spectrum bands and only its users, termed as legacy or Primary Users(PUs) are allowed to access these bands and operate there.
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