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A concatenated code uses

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A concatenated code uses

(a) One level of coding

(b) Two levels of coding

(c) Three levels of coding

(d) None of the mentioned

I have been asked this question in an online quiz.

The doubt is from Concatenated and Interleaving Codes and its Application in CD topic in division Channel Coding of Digital Communications

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Right answer is (b) Two levels of coding

The best I can explain: A concatenated code is the one that uses two levels of coding, inner code and outer code to achieve desired error performance.

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