Question

A pulse shaping filter should satisfy two requirements. They are

(a) Should be realizable

(b) Should have proper roll off factor

(c) Should be realizable & have proper roll off factor

(d) None of the mentioned

This question was addressed to me in a job interview.

Question is taken from Intersymbol Interference-1 in portion Baseband Demodulation and Detection of Digital Communications

Answer 1

Correct choice is (c) Should be realizable & have proper roll off factor

The best explanation: A pulse shaping filter should provide the desired roll off and should be realizable, that is the impulse response needs to be truncated to a finite length.