Threshold

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Threshold

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As shown by their analysis, decreasing carrier sensing threshold decreases the intensity of simultaneously active transmitters as well as the hidden node problem, and there exists an optimal carrier sensing threshold which depends on the operating conditions of the network.
Thus, for a given sensing threshold, the general expression of optimal sensing duration [[tau].sup.EG.sub.p]([[gamma].sub.EG], [e.sub.h]) for EG can be derived as
The aim of hypothesis testing is to devise a sensing threshold [lambda] that suitably divides the two generally overlapping distributions in p(D) while optimizing a certain selected performance metrics.
where t denotes the sensing time, [epsilon] the sensing threshold of the energy detector, [gamma] the SNR of the primary user's signal at the secondary detector, Na the noise variance and [f.sub.s] the sampling frequency, such that M = tfs.
All sensors are considered to be homogenous having the same sensing threshold power [delta] (in dB).