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In duobinary signalling method, for M-ary transmission, the number of output obtained is

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In duobinary signalling method, for M-ary transmission, the number of output obtained is

(a) 2M

(b) 2M+1

(c) 2M-1

(d) M2

This question was posed to me during an online exam.

I want to ask this question from Correlative Coding topic in chapter Formatting and Baseband Modulation of Digital Communications

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Correct choice is (c) 2M-1

To explain: In duobinary coding, the number of output obtained for M-ary transmission is 2M-1.

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