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Coherent modulation requires ____ level of synchronization.

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Coherent modulation requires ____ level of synchronization.

(a) One

(b) Two

(c) Three

(d) None of the mentioned

This question was posed to me during an interview for a job.

Query is from Synchronization and Network Synchronization in portion Synchronization of Digital Communications

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Right answer is (c) Three

Explanation: Coherent modulation requires three levels of synchronization – phase symbol and frame.

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