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In channel encoding procedure

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In channel encoding procedure

(a) Redundancy bits are added

(b) Errors are corrected

(c) Redundancy bits are added & Errors are corrected

(d) None of the mentioned

This question was addressed to me in an interview.

Enquiry is from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications

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Right answer is (c) Redundancy bits are added & Errors are corrected

The explanation is: In channel encoding includes addition of redundancy to the signal such that any bit errors can be corrected.

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