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Which type of demodulator is used in the frequency hopping technique?

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Which type of demodulator is used in the frequency hopping technique?

(a) Coherent

(b) Non coherent

(c) Coherent & Non coherent

(d) None of the mentioned

This question was addressed to me by my college director while I was bunking the class.

The origin of the question is Direct Sequence and Frequency Hopping topic in portion Spread Spectrum Techniques of Digital Communications

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Right option is (b) Non coherent

For explanation: As it is difficult to maintain phase coherence, non coherent demodulator is used.

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