Performance Analysis of Energy Based Spectrum Sensing over Nakagami-m Fading Channels with Noise uncertainty

Spectrum is getting rare day after day and in order to mitigate the scarcity of spectrum, cognitive radio (CR) is being introduced which the licensed spectrum is being sensed by a device that is allowed to use in the case of spectrum under-utilization. The device which is sensing the licensed spectrum is called secondary user for that spectrum. In the case of vacancy detection, secondary user could use that spectrum till the licensed spectrum user which is called primary user begin to use its allocated spectrum again. The key factor in CR systems is spectrum sensing. Secondary user should reliably ensure that the spectrum band is not being used by primary user and there should be no interference with it. One of the key factors in spectrum sensing is simplicity of the algorithm to be used in detection devices. Because of low computational complexity, energy detection-based (ED) spectrum sensing is very popular. In this paper, the performance of ED spectrum sensing method and parameters effecting its performance over Nakagami-m fading channels is studied and analyzed with and without noise uncertainty.