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In Cognitive Radio Networks (CRNs), the design of an optimal spectrum sensing scheme is an important problem that has recently been drawing consideration attention. Various sensing-related performance tradeoffs have been studied as an efficient means to maximize the secondary network performance. Despite its importance, however, the sensing - access tradeoff - between sensing overhead and the MAC-layer contention among secondary users in accessing the thus-discovered spectrum opportunities - has not yet been accounted for. In this paper, the authors show that the secondary network throughput can be improved significantly by incorporating the sensing - access tradeoff in the design of spectrum sensing.
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