ASK (Matlab 2012a)

Program:

clc;
clear all;
b = input('Enter the Bit stream = ');
n = length(b);
t = 0:0.01:n;
x = 1:1:(n+1)*100;
for i = 1:n
for j = i:0.1:i+1
bw(x(i*100:(i+1)*100)) = b(i);
end
end
bw = bw(100:end);
sint = sin(2*pi*t);
st = bw.*sint;
subplot(3,1,1);
plot(t,bw);
xlabel('n ---->');
ylabel('Amplitude ---->');
title('Input Bit Stream');
grid on ;
axis([0 n -2 +2]);
subplot(3,1,2);
plot(t,sint);
xlabel('Time ---->');
ylabel('Amplitude ---->');
title('Carrier Wave');
grid on ;
axis([0 n -2 +2]);
subplot(3,1,3);
plot(t,st);
xlabel('Time ---->');
ylabel('Amplitude ---->');
title('ASK Wave');
grid on ;
axis([0 n -2 +2]);

Output:

Enter the Bit stream = [0 1 1 0 1 0 0 0]

Output Waveforms: