Date Added: Jul 2011
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.