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Cognitive Radio (CR) is widely recognized as a novel approach to improve the spectrum efficiency. However, there exists one problem needed to be resolved urgently, that is the two conflicting goals in CR network: one is to minimize the interference to primary (licensed) system; the other is to maximize the throughput of secondary (unlicensed) system. Meanwhile, the Secondary User (SU) has to monitor the spectrum continuously to avoid the interference to Primary User (PU), thus the throughput of the secondary system is affected by how often and how long the spectrum sensing is performed.
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