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Which is called as on-off keying?

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Which is called as on-off keying?

(a) Amplitude shift keying

(b) Uni-polar PAM

(c) Amplitude shift keying & Uni-polar PAM

(d) None of the mentioned

The question was posed to me in examination.

This intriguing question comes from Modulation Techniques in portion Modulation and Coding Trade-off of Digital Communications

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The correct option is (c) Amplitude shift keying & Uni-polar PAM

Easy explanation: Amplitude shift keying and uni-polar PAM both schemes are called as on off keying.

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