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For a periodic function, the spectral density and auto correlation functions form

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For a periodic function, the spectral density and auto correlation functions form

(a) Fourier transform pair

(b) Laplace transform pair

(c) Hilbert transform pair

(d) Z transform pair

I have been asked this question during an internship interview.

This interesting question is from Types of Processes topic in chapter Signals and Spectra of Digital Communications

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Correct answer is (a) Fourier transform pair

Easiest explanation: For a periodic function, the spectral density and auto correlation function forms fourier transform pair.

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