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In MPSK adding new signals _______ make it vulnerable to noise and in MFSK _______ make it vulnerable.

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In MPSK adding new signals _______ make it vulnerable to noise and in MFSK _______ make it vulnerable.

(a) Does, does not

(b) Does not, does

(c) Does, does

(d) Does not, does not

The question was posed to me in an online quiz.

The query is from M-ary Signalling and Performance in portion Bandpass Modulation and Detection of Digital Communications

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Correct answer is (a) Does, does not

Easy explanation: In MPSK adding new signals that is on crowding the signals it makes it vulnerable to noise where as in MFSK it does not.

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