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How can I mix two signals in MATLAB?

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Balint Csejtei
Balint Csejtei on 25 Nov 2020
Commented: Star Strider on 27 Nov 2020
I have two signals stored in vectors, one of them is a 4-QAM baseband signal(m), and the other is a simple Local Oscillator sinusoid signal(Lo). Then I've simulated the mixing like this:
Rfsignal=m.*Lo;
and then i filtered out the low frequency component of Rsignal, but after that, the radio signal doesn't look like the baseband, and I couldn't get back the digital data after demodulation. I know there are mixer objects in Simulink, but i want to use matlab coding, because it's much more practical. So I'm looking for a coding solution to properly mixing the baseband and the Lo signals in such a way that the Rf signal looks similar to the baseband.
Thanks a lot.

Answers (1)

Star Strider
Star Strider on 25 Nov 2020
Ther esult would appear to be a single-sideband suppresed-carrier signal (with only the upper sideband). See if the demod function will do what you want.
  6 Comments
Star Strider
Star Strider on 27 Nov 2020
Quite possibly. I have never tried to do something like that.
I suggest you look throiugh the Communications Toolbox documentation to see if something like what you want to do exists there, or perhaps gives some idea of how to do what you want to do. (I do not have the Communications Toolbox, and so have no experience with it.)

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