Post by chris460 on Apr 18, 2012 17:51:40 GMT -5
Normally when I do matched filtering, I have always had the luxury that the data I'm provided is in the I+iQ format already. The matched filtering output is very pretty since I can just look at the envelope (or amplitude) independent of the phase. For example, the matched filter output in the I+iQ representation for a pulse of constant frequency is simply a triangle.
However, if I have a real signal, say an acoustic signal, how do I put it into a I+iQ form so I can use all the tricks I know how to do? Aren't the phase and amplitude of the signal now entertwined? Should I modulate a carrier wave with the real signal followed by the traditional method of splitting the signal into two outputs, mixing one with a sine wave of the carrier frequency, the other with the cosine wave of the carrier frequency, and bandpass filter? However, I don't know of any modulation scheme either theoretically or by computer trial and error that results in anything successfull.
However, if I have a real signal, say an acoustic signal, how do I put it into a I+iQ form so I can use all the tricks I know how to do? Aren't the phase and amplitude of the signal now entertwined? Should I modulate a carrier wave with the real signal followed by the traditional method of splitting the signal into two outputs, mixing one with a sine wave of the carrier frequency, the other with the cosine wave of the carrier frequency, and bandpass filter? However, I don't know of any modulation scheme either theoretically or by computer trial and error that results in anything successfull.