Spectrum sensing over Nakagami-m/Gamma composite fading channel with noise uncertainty

In this paper, the performance analysis of energy detection-based cognitive radio systems operating over Gamma shadowed Nakagami-m fading channels are presented and investigated. The composite multipath/shadowing model provide remarkably accurate statistical characterization due considering both small-scale and large-scale fading in their physical model. In this way, admitting the noise power estimation error and noise uncertainty, the worst case of the miss detection and false-alarm probabilities are derived for cooperative and non-cooperative spectrum sensing systems. Field measurements are used to investigate in practice the usefulness of the Nakagami-m/Gamma composite fading in cooperative spectrum sensing scenarios and an excellent fitting is found. Comparisons are performed against Rayleigh/Gamma fading model, in which it is possible to notice advantage in using the Nakagami-m/Gamma distribution.