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Phase-locked loop circuitry is used for

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Phase-locked loop circuitry is used for

(a) Carrier wave recovery

(b) Phase estimation

(c) Carrier wave recovery & Phase estimation

(d) None of the mentioned

I got this question in a national level competition.

The doubt is from Coherent Detection in chapter Bandpass Modulation and Detection of Digital Communications

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Best answer
The correct answer is (c) Carrier wave recovery & Phase estimation

Explanation: The phase locked loop circuitry locks on the arriving carrier wave and estimates its phase.

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