Abstract
Spectrum sensing is the key technology in cognitive radio for the efficient use of radio spectrum. The implementation of energy detection based spectrum sensing is done with the assumption of constant activity of the primary user. Practically, often the scenario occurs when primary user transmits signal in the frequency band of interest only for a fraction of the observation period. The paper aims at analyzing the degradation in performance of energy detection based sensors in the case of generalized κ-μ and α-μ fading channels. The theoretical results indicate low reliable performance in the case of fading channel due to primary user duty cycle variation at low signal-to-noise ratios.
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