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
Behind The Sciences (2020). PAM modulator and demodulator with AWGN channel (https://www.mathworks.com/matlabcentral/fileexchange/56830-pam-modulator-and-demodulator-with-awgn-channel), MATLAB Central File Exchange. Retrieved .