I have a set of IQ data. From those data I'm trying to get the amplitudes and the frequencies of my signal as I then want to plot them vs. time.
I am able to obtain the amplitudes by squaring both my I and Q values, summing them up and taking the square root of the sum; however, I am struggling to obtain the frequency.
I understand that I need to take a FFT to get from the time domain to the frequency domain but I'm not sure on what values I should apply the FFT. Should I do it individually on Is and j*Qs and then sum them up. Should I do it on the sum Is + j*Qs (which just gave me a new array of complex numbers of the form x + j*y). What role my center frequency / sampling frequency are going to play into that?
For context: I'm doing this using Python. (And I'm obviously pretty new to all of this.)