CNN cooperative spectrum sensing method and system based on covariance matrix Cholesky decomposition

The invention relates to a CNN cooperative spectrum sensing method and system based on covariance matrix Cholesky decomposition, and the method comprises the following steps: S1, carrying out the preprocessing of an original signal, and obtaining a covariance matrix; s2, the covariance matrix obtained in the step S1 is used as an input parameter, calculation is executed according to a covariance matrix decomposition method, and each secondary user obtains a lower triangular matrix X of the secondary user; s3, taking the lower triangular matrix X obtained in the step S2 as an input parameter, executing calculation according to a statistical magnitude construction method, and obtaining statistical matrixes under different signal-to-noise ratios as training and testing data of the CNN; and S4, marking the statistical matrix obtained in the step S3, taking the marked statistical matrix as an input parameter, executing calculation according to a CNN spectrum sensing method, and inputting a test set into the traine