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Which value of r (roll off factor) is considered as Nyquist minimum bandwidth case?

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Which value of r (roll off factor)  is considered as Nyquist minimum bandwidth case?

(a) 0

(b) 1

(c) Infinity

(d) None of the mentioned

This question was addressed to me in an internship interview.

I'd like to ask this question from Intersymbol Interference-1 topic in portion Baseband Demodulation and Detection of Digital Communications

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The correct option is (a) 0

Easiest explanation: For the roll off factor of 0 an ideal rectangular nyquist pulse is obtained. This is called as nyquist minimum bandwidth case.

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