How to plot AM (Amplitude Modulated) signal using MATLAB

1.Introduction:-
AM wave is defined as the amplitude of carrier is varies with respect to the modulating signal.
These signals are used in AM transmission and reception.


2.Problem Statement:-
To plot AM(Amplitude Modulated) signal using MATLAB.


3.Program:-
clc;
clear all;
close all;
t=0:0.0001:1;
em=5;
ec=5;
fm=10;
fc=100;
a=em*sin(2*pi*fm*t);
subplot(5,1,1);
plot(t,a);
xlabel('time');
ylabel('amplitude');
title('modulating signal');
b=ec*sin(2*pi*fc*t);
subplot(5,1,2);
plot(t,b);
xlabel('time');
ylabel('amplitude');
title('carrier signal');
m=0.5
ec=em/m;
c=ec*(1+m*sin(2*pi*fm*t)).*sin(2*pi*fc*t);
subplot(5,1,3);
plot(t,c)
xlabel('time');
ylabel('amplitude');
title('under modulated signal');
m=1
ec=em/m;
c=ec*(1+m*sin(2*pi*fm*t)).*sin(2*pi*fc*t);
subplot(5,1,4);
plot(t,c)
xlabel('time');
ylabel('amplitude');
title('perfect modulated signal');
m=2
ec=em/m;
c=ec*(1+m*sin(2*pi*fm*t)).*sin(2*pi*fc*t);
subplot(5,1,5);
plot(t,c)
xlabel('time');
ylabel('amplitude');
title('over modulated signal');


4.How to use this code:-
Here you have to only copy the code to MATLAB and just run it and on figure window all signal will appear.


5.Output :-
 Figure Window  
                              

6.Conclusion -
Here we have successfully plot the AM (Amplitude Modulated) using MATLAB .

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