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Static spectrum assignment, which has been applied to radio frequencies for almost a century, has led to a quasi-scarcity of the spectrum. Therefore, finding a new unassigned frequency slot has forced system designers toward higher frequencies, e.g., 60 GHz. However, most of the already allocated radio bands are not used or are sporadically used. Then, it is logical to allow unlicensed users to exploit these frequencies when they are free at a specific place and time. Theoretically, such approach will increase the overall frequency reuse and boost the throughput for applications that opportunistically use the empty frequencies. This communication technique is called Opportunistic Spectrum Access (OSA).
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