clear all;
close all;
N = 8;
bit_stream = round(rand(1,N));
A1 = 3; A2 = 5;f = 3;
fs = 100;
t = 0: 1/fs : 1;
time = [];
ASK_signal = [];
Digital_signal = [];
for ii = 1: 1: length(bit_stream)
ASK_signal = [ASK_signal (bit_stream(ii)==0)*A1*sin(2*pi*f*t)+...
(bit_stream(ii)==1)*A2*sin(2*pi*f*t)];
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Digital_signal = [Digital_signal (bit_stream(ii)==0)*...
zeros(1,length(t)) + (bit_stream(ii)==1)*ones(1,length(t))];
time = [time t];
t = t + 1;
end
subplot(2,1,1);
plot(time,Digital_signal,'r','LineWidth',2);
xlabel('Time (bit period)');
ylabel('Amplitude');
title('Original Digital Signal');
axis([0 time(end) -0.5 1.5]);
grid on;
subplot(2,1,2);
plot(time,ASK_signal,'LineWidth',2);
xlabel('Time (bit period)');
ylabel('Amplitude');
title('ASK Signal with two Amplitudes');
grid on;