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Which has higher error probability performance?

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Which has higher error probability performance?

(a) Uni-polar base-band signalling

(b) Bipolar base-band signalling

(c) ASK

(d) FSK

I got this question by my school teacher while I was bunking the class.

Enquiry is from Modulation and Entropy in chapter Modulation and Coding Trade-off of Digital Communications

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The correct choice is (b) Bipolar base-band signalling

Easy explanation: Bipolar base-band signalling has high error probability performance than the others. The probability of error value is A2T.

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