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The spectrum sensing problem has gained new aspects with cognitive radio and opportunistic spectrum access concepts. It is one of the most challenging issues in cognitive radio systems. In cognitive radio networks, the secondary (unlicensed) users need to find idle channels via spectrum sensing for their transmission. Adaptive Spectrum Sensing (ASS) is a promising technology in spectrum sensing with an admirable performance. In ASS, multiple secondary users individually sense the idle channels and send their decisions to the network center, and then the center will do a final decision. Spectrum sensing, which aims at detecting spectrum holes, is the precondition for the implementation of Cognitive Radio (CR).
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