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In this paper, the authors give insight into the performance of Dynamic Spectrum Access Networks (DSAN), analyzing Quality of Detection of Primary User (PU) and DSAN blocking probability, when the channel is under the effect of log-normal shadowing. Specifically they propose a distributed power conserving PU detection architecture and investigate the impact of PU detection accuracy on DSAN performance. They measure DSAN blocking probability as a function of the number of PU channels and their utilization. Finally they propose two efficient DSAN channel access schemes called Least-used and Least-used with Channel Hopping which aim at minimizing packet dropping due to the arrival of the PU.
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