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Cognitive Radios (CRs) have been recently proposed for the problem of spectrum scarcity. The main principle of the operation of these radios is based on the opportunistic access to the frequency spectrum mainly dedicated to Primary Users (PUs). However, statistical characteristics of PUs, either their spatial distribution or time pattern of channel usage can affect the usability of a specific frequency...
The new upper bound interference temperature (IT) has provided Cognitive Radios (CRs) with new resources of frequency spectrum. The principle is that CRs are allowed to use channels mainly licensed to some Primary Users (PUs) provided that their operation will not violate the IT limit determined by PUs. In this paper, through statistical analysis, the effect of the modulation selection strategies...
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