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The error performance of MPSK ______ as M or k increases.

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The error performance of MPSK ______ as M or k increases.

(a) Increases

(b) Decreases

(c) Stays constant

(d) None of the mentioned

The question was posed to me in a job interview.

This key question is from M-ary Signalling and Performance in section Bandpass Modulation and Detection of Digital Communications

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Right option is (b) Decreases

Explanation: The error performance of MPSK degrades as M or k increases.

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