My understanding of I and Q channels is as follows (please correct me if I am wrong):
I= In-phase, or real component
Q= Quadrature (90° shift of real component)
Where do these two channels come from in the first place? Is one the electric field and the other the magnetic field of a EM wave? I was under the impression that these channels are only present in digital waveforms; if this is true, and if so, why?
How can this be used to find the vector of on incoming signal, and would the signal modulation make a difference (assuming you can invoke the proper filtering necessary)?