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Scarcity and the value of spectrum resource for wireless communications challenged the traditional static spectrum allocation policy. Recent measurements [1] show that in spite of the fact that available frequency spectrum have been almost occupied by the existing carriers, most of the time we can find spectrum bandwidths that are free of signal. Thus, the efficient usage of limited spectrum has been highly required.

Delay Analysis and Channel Selection in Single-Hop Cognitive Radio Networks for Delay Sensitive Applications