Wiener–Khinchin theorem
Spectral decomposition theorem of stationary processes' autocorrelations / From Wikipedia, the free encyclopedia
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In applied mathematics, the Wiener–Khinchin theorem or Wiener–Khintchine theorem, also known as the Wiener–Khinchin–Einstein theorem or the Khinchin–Kolmogorov theorem, states that the autocorrelation function of a wide-sense-stationary random process has a spectral decomposition given by the power spectral density of that process.[1][2][3][4][5][6][7]