Question

Which of the following parameters are required to calculate the correlation between the signals x(n) and y(n)?

(a) Time delay

(b) Attenuation factor

(c) Noise signal

(d) All of the mentioned

I had been asked this question by my college director while I was bunking the class.

This key question is from Correlation of Discrete Time Signals topic in division Discrete Time Signals and Systems of Digital Signal Processing

Answer 1

Correct choice is (d) All of the mentioned

Explanation: Let us consider x(n) be the input reference signal and y(n) be the reflected signal.

Now, the relation between the two signals is given as y(n)=αx(n-D)+w(n)

Where α-attenuation factor representing the signal loss in the round-trip transmission of the signal x(n)

D-time delay between the time of projection of signal and the reflected back signal

w(n)-noise signal generated in the electronic parts in the front end of the receiver.