Analog Communications – Exercise – 1

Exercise – 1

1. For a Gaussian process, auto-correction also implies –

(a) Statistical dependence
(b) Statistical independence
(c) Ergodic process
(d) None of these

Answer
Answer : (b)
Explanation
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2. An ergodic process in communication present if many random signals have-

(a) Identical time averages
(b) Identical ensemble averages
(c) Identical time and ensemble averages
(d) None of the above

Answer
Answer : (c)
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3. Spectral density expresses –

(a) Average voltage
(b) Average current
(c) Average power in a waveform as a function of frequency
(d) None of the above

Answer
Answer : (c)
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4. Which of the following is not true regarding auto-correlation function?

(a) It is an average function
(b) It is defined only for periodic signals
(c) It is measure of both time variation and statistical dependence
(d) It is non-unique description of signals

Answer
Answer : (b)
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5. For a periodic function, the spectral density and auto-correlation functions are –

(a) Fourier transform pair
(b) Laplace transform pair
(c) one and the same thing
(d) None of the above

Answer
Answer : (a)
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