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In bipolar codes, pulses can be

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In bipolar codes, pulses can be

(a) Positive

(b) Negative

(c) Absent

(d) All of the mentioned

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The above asked question is from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications

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Correct answer is (d) All of the mentioned

The explanation: In bipolar codes, the pulses can be positive, negative or absent.

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