Abstract:

This paper addresses the primary user’s spectrum detection in the nonGaussian noise. The mixedGaussian model is used to fit the nonGaussian noise, and the mixture parameter and other parameters in the mixture model are estimated by moment estimation. The testing statistics of the mixedGaussian Rao detection and expressions of performance are derived by comparing the mixedGaussian Rao detection method to the Gaussian Rao detection. In addition, a multiuser the cooperative detection model is established and the cooperative detection performance formula is derived based on the improved OR rule. Through theoretical simulations and Monte Carlo simulations, it shows that with a given probability of false alarm, detection method based on mixedGaussian Rao can effectively improve the primary user detection performance under the nonGaussian noise.

Key words: cognitive radio;nonGaussian noise;Rao detection;cooperation