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What is the code rate?

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What is the code rate?

(a) k/n

(b) n/k

(c) All of the mentioned

(d) None of the mentioned

The question was asked in my homework.

The above asked question is from Digital Communication Signal Processing topic in division Signals and Spectra of Digital Communications

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Correct choice is (a) k/n

To elaborate: Here n is the total bits of sequence and k bits are mapped. Amount of redundancy introduced is given by n/k and its reciprocal is the code rate.

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