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Which of the following requires a synchronizing signal?

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in Digital Communications by (828k points)
Which of the following requires a synchronizing signal?

(a) Single channel PPM system

(b) PAM

(c) DM

(d) All of the mentioned

The question was posed to me during an online interview.

Enquiry is from PAM,PWM and TDM in section Modulation and Coding Trade-off of Digital Communications

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Best answer
The correct option is (b) PAM

To explain: PAM requires a synchronizing signal.

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