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We know that in equiprobable data,change in phase over a time interval, this result will be directly proportional to frequency: f∝Im(s(n)s(n−1)∗) Where s(n) is the normalized complex FSK time domain signal.

In the MPSK Modulations, Cyclic Spectrum Density method can give a peaks, for example for the QPSK:

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But in the in the non equiprobable FSK signal, this peaks do'nt appear. How to solve it?

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  • $\begingroup$ If I understand this question correctly, I think you're confusing something: frequency is defined as change in phase over time, that has nothing to do with FSK, or the data. It always is true – it's a definition. $\endgroup$ Jan 18, 2020 at 16:13
  • $\begingroup$ @Marcus Müller I ediited my question. $\endgroup$ Jan 20, 2020 at 9:45

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