Question: Which of the following could be the correlation function of a stationary random process? (a) (b) (c) (d) (e) (f) Ra(r) = exp (-ld) Rb(

Which of the following could be the correlation function of a stationary random process?
(a)
Which of the following could be the correlation function of

(b)

Which of the following could be the correlation function of

(c)

Which of the following could be the correlation function of

(d)

Which of the following could be the correlation function of

(e)

Which of the following could be the correlation function of

(f)

Which of the following could be the correlation function of

Ra(r) = exp (-ld) Rb( r) exp (-r)21 ( 7) = (7) = exp (ld). RAT) sinc ( )

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