Frequency Shift Keying using MATLAB

 

clc
clear all
close all
m=input('enter the binary sequency')
l=length(m)
t=[0.01:0.01:l]
for i=1:1:l
a((i-1)*100+1:i*100)=m(i)
end
% the fsk can be written as sum of two asks having different frequencies  
% generating the ASK Signal for the inputed sequence with high frequency
f1=a.*(sin(2*pi*5*t))
f2=not(a).*sin(2*pi*t)
fsk=f1+f2
figure(1)
plot(f1)
title('ASk signal')
figure(2)
plot(f2)
title('ask signal')
figure(3)
plot(fsk)
title('frequency shift keying signal')
figure(4)
hold on
plot(f1,'black')
plot(f2,'red')
helg=legend('high frequency signal','low frequency signal')
hold off

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