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In differential PSK the date is

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In differential PSK the date is

(a) Encoded differentially

(b) Decoded differentially

(c) Encoded & Decoded differentially

(d) None of the mentioned

I got this question at a job interview.

My question is from Coherent Detection topic in chapter Bandpass Modulation and Detection of Digital Communications

1 Answer

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Correct choice is (a) Encoded differentially

For explanation I would say: In this method, the data is encode deferentially that is the presence of binary zero or one is manifested by symbol’s similarity or difference when compared to that of the previous symbol.

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