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In M-ary PPM waveform, modulation is effected by

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In M-ary PPM waveform, modulation is effected by

(a) Delaying

(b) Advancing

(c) Delaying & Advancing

(d) None of the mentioned

The question was posed to me in quiz.

This question is from Baseband Transmission-2 topic in chapter Formatting and Baseband Modulation of Digital Communications

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Correct choice is (c) Delaying & Advancing

Easy explanation: In M-ary PPM waveform, modulation is effected by delaying or advancing pulse occurrence by an amount that corresponds to information symbol.

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