Performance Advancement Of Energy Detection In Cognitive Radio Over Composite Shadowed Nakagami-M Fading With Maximum Ratio Combining Reception

摘要

The spectrum sensing is the key function of cognitive radio and energy detector is the most popular method used for spectrum sensing. Detection of the availability of unused spectrum for the secondary user becomes difficult when the channel is affected by composite fading. In this paper, analytical expressions of average probability of detection and average area under the receiver operating characteristic over Nakagamim/ log-normal with maximum ratio combining diversity are derived using Gaussian-Hermite integration approximation. In addition, an optimized threshold has been incorporated to overcome the problem of spectrum sensing even at low signal-to-noise ratio. To authenticate the exactness of exact results and derived analytical expressions, simulations are integrated.