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The error probability of DPSK is ________ worse than PSK.

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The error probability of DPSK is ________ worse than PSK.

(a) Twice

(b) 3 db

(c) Twice (3db)

(d) None of the mentioned

I have been asked this question in an online interview.

The question is from Coherent Detection in section Bandpass Modulation and Detection of Digital Communications

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Right option is (c) Twice (3db)

Easiest explanation: DPSK has twice as much as noise than in PSK. The error probability in DPSK is twice (3db) worse than PSK.

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