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Drawing QPSK constellation with matlab
First of all, there is a question you don't understand. Not matlab.
The eye diagram is the superposition of time domain waveforms, the constellation diagram is the demodulated symbol, and the two signals are different signals. And your letter number. You didn't say what it was.
What if the above questions are clarified ~ that's very simple ~
The eye diagram is to truncate the signal by an integer multiple of the symbol period and then draw it together. The constellation diagram is even simpler, just need a scatter diagram ~
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