MATLAB Code to Simulate / Generate the Amplitide Modulation Signal (AM Signal) [ Amplitude Modulation using MATLAB]

Amplitude modulation (AM) is a method of superimposing the message onto an alternating carrier waveform.The highest frequency of the modulating signal (Message Signal) is normally < 10 % of the carrier frequency. The instantaneous amplitude of the modulated wave varies as per the amplitude of the message signal.

MATLAB Code For Amplitude Modulation:

clc;
clear all;
close all;

Ac=2; %carrier amplitude
fc=0.5; %carrier frequency
Am=.5; %message signal amplitude
fm=.05; %message signal frequency
Fs=100; %sampling rate/frequency

ka=1;%Amplitude Sensitivity

t=[0:0.1:50];%defining the time range & disseminating it into samples
ct=Ac*cos(2*pi*fc*t); %defining the carrier signal wave
mt=Am*cos(2*pi*fm*t); %defining the message signal
AM=ct.*(1+ka*mt); %Amplitude Modulated wave, according to the standard definition

subplot(3,1,1);%plotting the message signal wave
plot(mt);
ylabel('Message signal');

subplot(3,1,2); %plotting the carrier signal wave
plot(ct);
ylabel('carrier');

subplot(3,1,3); %plotting the amplitude modulated wave
plot(AM);
ylabel('AM signal');


Screenshot of the output:
MATLAB Code to Simulate / Generate the Amplitide Modulation Signal (AM Signal) [ Amplitude Modulation using MATLAB]
MATLAB Code to Simulate / Generate the Amplitide Modulation Signal (AM Signal) [ Amplitude Modulation using MATLAB]


Visit More On Digital iVision Labs:
#FSK Simulation Code Using MATLAB
#Phase Shift Keying (PSK) Modulation MATLAB Simulation, With MATLAB Code

An active & prominent author at Digital iVision Labs! Specializing in MATLAB, C++, Arduino, OpenCV, NI Labview, Web Designing & other Electronics stuffs! Just started M.Tech. From IIIT Delhi, looking for excellent PhD Opportunities with prominent researchers. Drop a mail: vibhutesh[at]gmail.com or Follow him at....
Facebook
Google+
Linkedin

8 comments:

  1. UnknownMarch 10, 2016 at 5:44 PM

    How can we interface this code with arduino uno kit

    ReplyDelete
    Replies
    1. VibhuteshMarch 11, 2016 at 5:32 AM

      Use Serial Communication for sending the digits to Arduino And use analog pin to create a corresponding voltage: Idea for that: http://www.divilabs.com/2013/11/accessing-serial-port-using-matlab-code.html
      Although MATLAB has also developed a Arduino Toolkit that can help you in this regard.

      Delete
  2. UnknownMarch 30, 2017 at 12:33 PM

    Hi,
    what is modulation coefficient? Did you mean modulation Index by it? What is the use of 'Fs' in the code?
    Regards
    Nazmul

    ReplyDelete
    Replies
    1. VibhuteshApril 18, 2017 at 4:29 AM

      ka is Amplitude Sensitivity. I have corrected it. Fs is sampling rate. For setting a sampling rate we need to follow the Niquist Criteria. Which needs it to be atleast twice the maximum frequency component if the signal.

      Delete
    2. VibhuteshApril 18, 2017 at 4:32 AM

      ka should be a positive value such that, Ac.*(1+ka*mt) is greater than or zero (i.e., non negative).

      Delete
  3. UnknownMarch 30, 2017 at 12:34 PM

    Hi,
    What is modulation coefficient? Did you mean Modulation Index by it? What is the use of 'Fs' in the code?

    ReplyDelete
    Replies
    1. VibhuteshApril 18, 2017 at 4:29 AM

      ka is Amplitude Sensitivity. I have corrected it. Fs is sampling rate. For setting a sampling rate we need to follow the Niquist Criteria. Which needs it to be atleast twice the maximum frequency component if the signal.

      Read more: http://www.divilabs.com/2014/03/matlab-code-to-simulate-generate.html#ixzz4edR0xOoT

      Delete
  4. UnknownMarch 9, 2019 at 9:19 PM

    Write matlab code for phase modulation

    ReplyDelete

Subscribe to: Post Comments (Atom)