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Autocorrelation function of periodic signal is equal to _______

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Autocorrelation function of periodic signal is equal to _______

(a) Energy of the signal

(b) Power of the signal

(c) Its area in frequency domain

(d) None of the mentioned

I had been asked this question in final exam.

The above asked question is from Spectral Density and Autocorrelation in section Signals and Spectra of Digital Communications

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The correct option is (b) Power of the signal

To elaborate: Autocorrelation function of a real valued signal is equal to the energy of the signal and auto-correlation function of the periodic signal is equal to the average power of the signal.

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