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Which modulation scheme uses nonlinear transponders?

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Which modulation scheme uses nonlinear transponders?

(a) MSK

(b) Offset QPSK

(c) MSK & Offset QPSK

(d) None of the mentioned

I had been asked this question in an online quiz.

I need to ask this question from Bandwidth Efficiency Plane and Bandwidth Efficient Modulation topic in portion Modulation and Coding Trade-off of Digital Communications

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Right answer is (c) MSK & Offset QPSK

To explain I would say: Offset QPSK and MSK are two examples of constant envelope modulation schemes that are attractive for systems using non linear transponders.

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