Plot Noisy QPSK Constellation
Apply QPSK modulation to a signal of random data. Pass the modulated signal through an AWGN channel. Plot the signal constellation.
doc_qpsk_mod model generates QPSK data, applies white noise, and displays the resulting constellation diagram.
Run the model with the Eb/N0 of the AWGN Channel block set to 15db.
Change the Eb/N0 from 15 dB to 10 dB. The noise level increases as shown by the greater distance between the samples.