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An error in binary decision making occurs when the channel noise is

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An error in binary decision making occurs when the channel noise is

(a) Greater than the optimum threshold level

(b) Lesser than the optimum threshold level

(c) Greater or Lesser than the optimum threshold level

(d) None of the mentioned

The question was asked by my school teacher while I was bunking the class.

This interesting question is from Intersymbol Interference-2 topic in division Baseband Demodulation and Detection of Digital Communications

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Correct choice is (c) Greater or Lesser than the optimum threshold level

Easy explanation: An error will occur when s1(t) or s2(t) is sent and if the channel noise is greater or lesser than the optimum threshold level.

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