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The modulation index of an FSK signal is similar to modulation index of ________

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The modulation index of an FSK signal is similar to modulation index of ________

(a) Amplitude modulation

(b) Phase modulation

(c) QPSK

(d) Frequency modulation

This question was addressed to me in an interview.

Question is taken from Constant Envelope Modulation topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct answer is (d) Frequency modulation

To elaborate: The modulation index of an FSK signal is similar to FM modulation index. It is defined by (2∆F)/Rb. Here ∆F is the peak RF frequency and Rb is the bit rate.

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