I would like to create a discriminator of an FSK signal in order to demodulate it.
I only have the real part of the signal and it is centered in zero frequency (baseband)
My main problem is that I am not able to make the arctan of this signal because it is real. I am in a symetry issue using cos-1 or sin-1.
Do you have any idea how to transform it to a complex representation?
I was wondering if it was possible to use Hilbert transform. I heard of it but I don't know if it is suitable for my problem.