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MSK is sometimes also referred as _________

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MSK is sometimes also referred as _________

(a) Slow FSK

(b) Fast FSK

(c) Slow PSK

(d) Fast PSK

This question was addressed to me during a job interview.

My question is from Constant Envelope Modulation topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct answer is (b) Fast FSK

Easiest explanation: Minimum shift keying is sometimes also referred as fast FSK. It is so called because frequency spacing used is only half as much as that used in conventional noncoherent frequency shift keying.

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