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The method which has greater bandwidth efficiency is called as

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The method which has greater bandwidth efficiency is called as

(a) Duobinary signalling

(b) Polybinary signalling

(c) Correlative coding

(d) All of the mentioned

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Asked question is from Correlative Coding in section Formatting and Baseband Modulation of Digital Communications

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Correct choice is (b) Polybinary signalling

Best explanation: If more than three levels are introduced in duobinary signalling technique the bandwidth efficiency increases This method is called as polybinary signalling.

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