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Say I have a QPSK signal transmitted at a carrier frequency of 5 MHz. The message rate is 100 kHz. If I use a Tektronix scope or data acquisition box to digitize and capture the signal (not a direct conversion to baseband) I get a "real" time series correct?

Now if I want to use this time series in Matlab to demodulate and learn about quadrature modulation and demodulation, do I need to convert each of the samples to I and Q? How do I do that? Multiply by sin and cos? I like to learn through examples, so if you an provide that, it would be much appreciated.

ocrdu
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RobbieK
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  • There's a nice page I rapidly found that not only provides a quick overview but it appears that the page author is also a book author, as well. The books appear to be just what you'd want to read. – jonk Sep 29 '22 at 03:51

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