MATLAB code for ask fsk and psk

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MATLAB Script

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clc; clear all; close all;

carrier_frequency=5; %Hz

carrier_frequency2=7; %Hz This will be utilized for FSK's second carrier

x=[1 0 0 1 1 0 0 1] % input signal ;

length=size(x,2);

 

i=1;

while i<length+1

     t = i:0.001:i+1;

    if x(i)==1

       ask=sin(2*pi*carrier_frequency*t);

       fsk=sin(2*pi*carrier_frequency*t);

       psk=sin(2*pi*carrier_frequency*t);

    else

        ask=0;

        fsk=sin(2*pi*carrier_frequency2*t);

        psk=sin(2*pi*carrier_frequency*t+pi);

    end

   

    

    subplot(3,1,1);

    plot(t,ask);

    hold on;

    grid on;

    axis([1 10 -1 1]);

 title('Amplitude Shift Key')

    subplot(3,1,2);

    plot(t,fsk);

    hold on;

    grid on;

    axis([1 10 -1 1]);

title('Frequency Shift Key')

 

    subplot(3,1,3);

    plot(t,psk);

    hold on;

    grid on;

    axis([1 10 -1 1]);

 title('Phase Shift Key')

 

    i=i+1;

 end

%%% Code ends here %%%

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