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Which is more vulnerable to noise?

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Which is more vulnerable to noise?

(a) 2-ary system

(b) 4-ary system

(c) Binary system

(d) None of the mentioned

The question was posed to me during an online interview.

My question comes from M-ary Signalling and Performance in section Bandpass Modulation and Detection of Digital Communications

1 Answer

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Best answer
The correct answer is (b) 4-ary system

Best explanation: The minimum energy noise vector for 4-ary system is smaller than 2-ary system. So 4-ary system is more vulnerable to noise.

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