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Power spectral density function is a?

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Power spectral density function is a?

(a) Real and even function

(b) Non negative function

(c) Periodic

(d) All of the mentioned

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Enquiry is from Spectral Density and Autocorrelation in section Signals and Spectra of Digital Communications

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Right answer is (d) All of the mentioned

Explanation: A power signal is periodic signal and its function is a real even and non negative function as per the definition.

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