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Autocorrelation function of white noise is ________

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Autocorrelation function of white noise is ________

(a) an impulse function

(b) a step function

(c) a constant

(d) a variable

The question was posed to me in my homework.

This question is from Quadrature Carrier Multiplexing topic in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct choice is (c) a constant

The explanation: White noise is an internal noise of communication system having different frequencies present with equal intensities. It has a peak only at zero and are zero at all points. Thus, the autocorrelation function of white noise is a constant.

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