I have simple 16QAM Modulator block and am plotting the constellation with and without the a polyphase clock block . The constellation directly out of the modulator is not 16 "points" or even blobs but "random" looking points. I put it into a QAM Demod block and it demodulates it correctly. The constellation plot of the polyphase clock block shows 16 distinct "points" but when demodulated is quite noisy. Can anyone explain: 1) Why is the output of the QAM Modulator block not show as 16 points? 2) Why would the "corrected" QAM Modulation not give better demodulation output?
I have attached the ConstellationQuestion.grc file. Thanks...Tom
ContstellationQuestion.grc
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