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Coherent PSK and non coherent orthogonal FSK have a difference of ______ in PB.

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Coherent PSK and non coherent orthogonal FSK have a difference of ______ in PB.

(a) 1db

(b) 3db

(c) 4db

(d) 6db

I have been asked this question during a job interview.

Enquiry is from Equalization and Non Coherent Detection topic in portion Baseband Demodulation and Detection of Digital Communications

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Right answer is (c) 4db

The best explanation: The difference of PB is approximately 4db for the best ( coherent PSK ) and the worst (non coherent orthogonal FSK).

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