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Spectrum sensing is one of the key technologies to realize spectrum reuse and increase the spectrum efficiency in Cognitive Radio Networks (CRNs). In this paper, the authors study energy-efficient cooperative multi-channel spectrum sensing in CRNs. They first propose a Cooperative Spectrum Sensing and Accessing (CSSA) scheme for all the Secondary Users (SUs). The SUs cooperatively sense the licensed channels of the Primary Users (PUs) in the sensing slot. If a channel is determined to be idle, the SUs which have sensed that channel will have a chance to transmit packets in the data transmission slot.
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