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For both PPM and PDM _______ is kept constant.

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For both PPM and PDM _______ is kept constant.

(a) Amplitude

(b) Time period

(c) Frequency

(d) Number of levels

The question was asked by my college professor while I was bunking the class.

This intriguing question comes from Baseband Transmission-2 in portion Formatting and Baseband Modulation of Digital Communications

1 Answer

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Right choice is (a) Amplitude

To explain I would say: In PPM waveform delaying or advancing of pulse is done. In PDM the pulse width is varied. Thus in both the cases amplitude is maintained constant.

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