Amplitude modulation

Matlab program for Amplitude modulation.

Matlab code

clc;

clear all;

close all;

t=0:0.001:1; % Define time axis

A=1;   % Amplitude

fm=2;  % Message Signal frequency

fc=100;  % Carrier Signal frequency

% Message Signal

Sm=A*sin(2*pi*fm*t);

subplot(5,1,1);

plot(t,Sm);

xlabel('Time');

ylabel('Amplitude');

title('Message Signal');

% Carrier Signal

Sc=A*sin(2*pi*fc*t);

subplot(5,1,2);

plot(t,Sc);

xlabel('Time');

ylabel('Amplitude');

title('Carrier Signal');

% Amplitude modulated Signal

Sam=Sm.*Sc;

subplot(5,1,3);

plot(t,Sam);

xlabel('Time');

ylabel('Amplitude');

title('Amplitude modulated Signal');

% Amplitude Demodulated Signal

Sadm=Sam.*Sc;

subplot(5,1,4);

plot(t,Sadm);

xlabel('Time');

ylabel('Amplitude');

title('Amplitude Demodulated Signal');

% Filtering of Amplitude Demodulated Signal

Sfadm=filter([1 4 6 4 1],16,Sadm);

subplot(5,1,5);

plot(t,Sfadm);

xlabel('Time');

ylabel('Amplitude');

title('Filtered Amplitude Demodulated Signal');

Figure window