Proces stacjonarny: Różnice pomiędzy wersjami
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When processing WSS random signals with [[linear]], [[time-invariant]] ([[LTI system theory|LTI]]) [[filter (signal processing)|filter]]s, it is helpful to think of the correlation function as a [[linear operator]]. Since it is a [[circulant matrix|circulant]] operator (depends only on the difference between the two arguments), its [[eigenfunction]]s are the [[Fourier]] [[exponential function|complex exponential]]s. Additionally, since the [[eigenfunction]]s of LTI operators are also [[exponential function|complex exponential]]s, LTI processing of WSS random signals is highly tractable --- all computations can be performed in the [[frequency domain]]. Thus, the WSS assumption is widely employed in [[signal processing]] algorithms.
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