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GMSK is a ________ of MSK.

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GMSK is a ________ of MSK.

(a) Integral

(b) Opposite

(c) Derivative

(d) Similar

The question was posed to me in a job interview.

Origin of the question is Constant Envelope Modulation in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct answer is (c) Derivative

For explanation: Gaussian minimum phase shift keying is a simple binary modulation scheme. It is viewed as a derivative of MSK. GMSK considerably reduces the sidelobe levels in the transmitted spectrum.

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