The Paradox Between Spectrum Shortage And Spectrum

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With the rapid telecommunication industry development and the massive increase of the number of subscribers, the wireless radio spectrum has become a rare and precious resource. This situation is due to the actual rigid regulatory framework of the spectrum, whereby all the frequency bands are exclusively allocated to specific users and services, and no access from unlicensed users is allowed. Although, the Federal Communications Commission (FCC) recent report revealed that the current licensed spectrum is mostly underused in wide temporal and geographical dimensions [1]. Therefore, to solve the paradox between spectrum shortage and spectrum underutilization, dynamic spectrum access techniques have been recently recommended [2]. In dynamic
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