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For block codes _____ is necessary.

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For block codes _____ is necessary.

(a) Phase synchronization

(b) Frequency synchronization

(c) Frame synchronization

(d) None of the mentioned

I have been asked this question during an interview for a job.

I need to ask this question from Synchronization and Network Synchronization topic in chapter Synchronization of Digital Communications

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Correct answer is (c) Frame synchronization

Easy explanation: Frame synchronization is necessary when the information is organized in blocks or messages of some uniform number of symbols. Thus block code needs frame synchronization.

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