AM generation using MATLAB!!!

                                AM generation code for MATLAB!

%AM generation
t=0:0.001:1;
m=input('Enter modulation Index');
ms=5*sin(2*pi*5*t); %Message signal
cs=5*sin(2*pi*50*t); %Carrier signal
Am=(5+m*ms).*sin(2*pi*100*t);%AM signal
subplot(3,1,1);
plot(t,ms);
xlabel('Time');
ylabel('Amplitude');
title('Message signal');
subplot(3,1,2);
plot(t,cs);
xlabel('Time');
ylabel('Amplitude');
title('Carrier signal');
subplot(3,1,3);
plot(t,Am);
xlabel('Time');
ylabel('Amplitude');
title('AM signal');

Output:
Enter modulation Index 1

Generation of FM using MATLAB!!!

FM generation code for MATLAB!

%FM generation
t=0:0.001:1;
m=input('Enter modulation Index');
ms=5*sin(2*pi*5*t); %Message signal
cs=5*sin(2*pi*100*t); %Carrier signal
Fm=10*sin(2*pi*50*t+(m.*sin(2*pi*5*t)));%FM signal
subplot(3,1,1);
plot(t,ms);
xlabel('Time');
ylabel('Amplitude');
title('Message signal');
subplot(3,1,2);
plot(t,cs);
xlabel('Time');
ylabel('Amplitude');
title('Carrier signal');
subplot(3,1,3);
plot(t,Fm);
xlabel('Time');
ylabel('Amplitude');
title('FM signal');

Output:Enter modulation Index 5

Generation of ASK using MATLAB!!!

Code for generation of ASK using MATLAB!

x=input('input binary message sequence');
N=length(x);
t=0.001:0.001:N;
for i=1:1:N;
   m((i-1)*1000+1:i*1000)=x(i);
end
c1=2*sin(2*pi*5*t);
 y=m.*c1;
 subplot(3,1,1);
 plot(t,m);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Bit sequence');
 subplot(3,1,2);
 plot(t,c1);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Carrier');
 subplot(3,1,3);
 plot(t,y);
 xlabel('Time');
 ylabel('Amplitude');
 Title('ASK signal');

Output:[1 1 0 1 0 1 1 0 ]

        

Generation of PSK using MATLAB!!!

Code for generating PSK signal using MATLAB!!!

x=input('input binary message sequence');
N=length(x);
x(x==0)=-1;
t=0.001:0.001:N;
for i=1:1:N;
   m((i-1)*1000+1:i*1000)=x(i);
end
c1=2*sin(2*pi*5*t);
 y=m.*c1;
 subplot(3,1,1);
 plot(t,m);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Bit sequence');
 subplot(3,1,2);
 plot(t,c1);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Carrier');
 subplot(3,1,3);
 plot(t,y);
 xlabel('Time');
 ylabel('Amplitude');
 Title('PSK signal');

Output:Input sequence [1 1 0 1 0 1 1 0]

         

Generation of FSK signal using MATLAB!!!

Code for generating FSK signal using MATLAB!

x=input('input binary message sequence');
N=length(x);
t=0.001:0.001:N;
for i=1:1:N;
   m((i-1)*1000+1:i*1000)=x(i);
end
f1=10;
f2=5;
c1=2*sin(2*pi*f1*t);
 y1=m.*c1;
 for j=1:N
     if x(j)==1
         x(j)=0;
     else
         x(j)=1;
     end
     m1((j-1)*1000+1:j*1000)=x(j);
 end
 c2=2*sin(2*pi*f2*t);
 y2=m1.*c2;
 y=y1+y2;
 subplot(3,1,1);
 plot(t,m);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Bit sequence');
 subplot(3,1,2);
 plot(t,c1);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Carrier');
 subplot(3,1,3);
 plot(t,y);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Fsk signal');
Output:
 Input sequence [1 0 0 1 1 1 0]
       

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