Cooperative Asynchronous Sequential Sensing in Cognitive Radio Networks
Date Issued
2011
Date
2011
Author(s)
Huang, Hsin-Hao
Abstract
Cognitive Radio Networks (CRN) plays a critical role in efficient and reliable using spectrum. In order to achieve Cognitive Radio technology, secondary users need to sense primary users’ behavior at spectrum. In this paper, we consider a cognitive radio base station to presenting centralized cooperative spectrum sensing scheme. In the scheme, each secondary user computes the Log-Likelihood ratio for its every measurement, and the cognitive radio base station sequentially accumulates those Log-Likelihood statistics and determines whether to stop making sensing. Based on this model, we analyze the secondary users with a time of asynchronous sensing and the secondary users how to find the optimal stop time that let cognitive radio minimum totally sensing time. When the primary user is rapid changes in the sensing slot, we are more agile to detect the primary user’s behavior. We effectively reduce the detection delay and the error probability. Finally, we present a robust new mechanisms when the primary user of the information is incomplete or unknown status, how to accurately estimate the primary users of the sensing information to the real situation.
Subjects
Cognitive Radio Networks
spectrum sensing
cooperative spectrum sensing
Sequential Detection Test
Log-Likelihood ratio
asynchronous sensing
Type
thesis
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