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M-ary signalling produces _______ error performance with orthogonal signalling and _______ error performance with multiple phase signalling.

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M-ary signalling produces _______ error performance with orthogonal signalling and _______ error performance with multiple phase signalling.

(a) Degraded, improved

(b) Improved, degraded

(c) Improved, improved

(d) Degraded, degraded

The question was posed to me in class test.

The origin of the question is M-ary Signalling and Performance topic in section Bandpass Modulation and Detection of Digital Communications

1 Answer

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Correct option is (b) Improved, degraded

The best explanation: In M-ary signalling as k increases, the curve moves towards the degraded error performance. It produces improved error performance in case of orthogonal signalling and degraded error performance in case of multiple phase signalling.

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