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 .

Comments

Post a Comment

Popular post

How to do Phase Shift Keying (PSK) using MATLAB

Image
1. Introduction :- In PSK the phase of the carrier signal is changes with respect to the change of digital data. when the signal changes from 1 to 0 or vice versa the the phase of carrier signal change by 180 degree. 2 . Problem Statement :- To generate the PSK wave using MATLAB and plot the carrier ,square pulse and PSK signal on figure window. 3. Program :- clc; clear all; close all; f1=input('frequency of carrier='); f2=input('frequency of square wave='); a=3; t=0:0.001:1; x=a*sin(2*pi*f1*t); y=square(2*pi*f2*t); z=x.*y; subplot(3,1,1); plot(t,x); xlabel('time'); ylabel('amplitude'); title('carrier signal'); subplot(3,1,2); plot(t,y); xlabel('time'); ylabel('amplitude'); title('square wave'); subplot(3,1,3); plot(t,z); xlabel('time'); ylabel('amplitude'); title('PSK signal'); 4. How to use this code :- Here you have to only copy the code to MATLAB and jus
Read more

How to do Frequency Shift Keying (FSK) using MATLAB

Image
1. Introduction :- In FSK the modulated signal is shifted in steps that is from one frequency to another frequency depending on the digital pulse.If the higher frequency is used for represent the data '1' then lower frequency is used for represent '0'. 2 . Problem Statement :- To generate the FSK wave using MATLAB and plot the carrier ,square pulse and FSK signal on figure window. 3. Program :- clc; clear all; close all; t=0:0.0001:1; fm=4; m=[ones(1,900) zeros(1,1500) ones(1,1000) zeros(1,1500) ones(1,1000) zeros(1,1500) ones(1,2601)]; subplot(4,1,1); plot(t,m); axis([0 1 0 1.5]) title('modulating signal'); xlabel('time'); ylabel('amplitude'); fc1=input('enter the value of carrier 1='); fc2=input('enter the value of carrier 2='); c1=4*sin(2*pi*fc1*t); c2=4*sin(2*pi*fc2*t); subplot(4,1,2); plot(t,c1); title('carrier signal 1'); xlabel('time'); ylabel('amplitude'); subplot(4,1
Read more