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This page of MATLAB source code covers ASK matlab code. The output plots and mathematical equations of ASK modulation matlab code are mentioned. ASK modulation stands for Amplitude Shift Keying Modulation.

Introduction:
The ASK modulation is a digital modulation technique in which amplitude of the carrier signal varies in accordance to the digital binary data (1 or 0). Binary logic-1 represents one level of carrier amplitude (i.e. A2) and logic-0 represents another level of carrier amplitude (i.e. A1) .

The figure-1 depicts ASK modulation type. As shown inputs are digital binary data and analog carrier while output is analog ASK modulated signal. It offers high bandwidth efficiency and provides very simple receiver design. Also refer difference between ASK, FSK and PSK modulation types>> and Advantages and Disadvantages of ASK Modulation>>.

clear;
clc;
b = input('Enter the Bit stream \n '); %b = [0 1 0 1 1 1 0];
n = length(b);
t = 0:.01:n;
x = 1:1:(n+1)*100;
for i = 1:n
for j = i:.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)
grid on ; axis([0 n -2 +2])
subplot(3,1,2)
plot(t,sint)
grid on ; axis([0 n -2 +2])
subplot(3,1,3)
plot(t,st)
grid on ; axis([0 n -2 +2])

### Input and Output of ASK modulation matlab source code

After the input is given press "ENTER" key, you will get output matlab image as below.