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What is the full form of PPM?

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What is the full form of PPM?

(a) pulse-position modulation

(b) position-pulse modulation

(c) pulse-pulse modulation

(d) position-position modulation

This question was posed to me at a job interview.

I'd like to ask this question from Single Side Band Transmission in chapter SSB Modulation of Analog Communications

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The correct choice is (a) pulse-position modulation

Easy explanation: PPM is used for both analog and digital signals. In PPM, when a single pulse is transmitted in the allotted time shift, the message bits get encoded. It is mostly used for optical communication such as optic fiber.

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