I have three questions about an FSK modem.

1. When - and when not - is carrier frequency estimation necessary for FSK
demodulation? When it is required, how should we do that? Note that it's
different than phase recovery that is done for coherent demodulators.

2. For coherent demodulation, how can phase be recovered in FSK case? So
for example, how to design a PLL phase detector in that case? Is there some
feedforward scheme as well?

3. How to implement an equalizer for FSK modulated signals?

   Appreciate your help.

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