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8Dandawate A V,Giannakis G B.Nonparametric poly-spectral estimators for kth-order (almost) cyclostationary processes[J]. IEEE Trans on Information Theory,1994,40(1):67～84.
9Gardner W A. Spectral correlation of modulated sig-nals: PartⅠ-analog modulation[J]. IEEE Trans on Communications,1987,COM-35(6):584～594.
