This model is a 8-ary modulator/demodulator based on Pulse Amplitude Modulation (PAM).
You can change the Eb/N0 parameter in the AWGN channel block to see the
effect of the channel noise on the demodulated signal. There is also a Matlab implementation, visit: http://www.behindthesciences.com/signal-processing/pulse-amplitude-modulation-pam-matlab-tutorial
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