Conventional cooperative spectrum detection method based on spectral correlation function has good detection performance in the case of low signal to noise ratio

but high computational complexity.It is difficult to use in practical application.A high efficiency cooperative spectrum detection method is proposed.Each cognitive user detects spectral correlation function of the received signal in single cycle frequency.The discrete-frequency smoothing method is used to estimate spectral correlation function and the amplitude of spectral correlation function is used as the test statistic quantity.In order to improve the detection performance

the fusion center uses OR criteria to fuse local decisions of all the cognitive users.The simulation results show that the method has the similar detection performance and greatly reduce the computational complexity.