1. Program to generate AM Signal and analyze the effect of increasing modulation index for each modulation technique.

 

Program to generate AM Signal and analyze the effect of increasing modulation index for each modulation technique.

// AM --> Amplitude Modulation

Ac=5; // Amplitude of the Carrier Signal.
Am=3; // Amplitude of the Modulating (Message) Signal.
wm=1;  
wc=10;

t=[1:0.002:13];

m=Am*cos(wm*t);
c=Ac*cos(wc*t);
meu=0.2;
Sam=Ac*(1+meu.*cos(wm*t)).*cos(wc*t);

plot(t,m, 'black', t,c, 'red', t,Sam , 'blue');
legend('message', ['carrier'], ['combined']);
xtitle('Amplitude Modulation');
xlabel('Time');
ylabel('Amplitude');
// Output


Program to generate AM Signal and analyze the effect of increasing modulation index for each modulation technique.
                                      AM --> Amplitude Modulation






































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3. Program to generate FM Signal and Analyze the effect of increasing modulation index for each modulation technique.




















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  Program to generate FM Signal and Analyze the effect of increasing modulation index for each modulation technique. // FM --> Frequency Modulation   Ac= 10 ; Am= 10 ; wm= 2 * %pi * 25 ; wc= 2 * %pi * 400 ; t=[ 1 : 0.0002 : 1.1 ];  m=Am* cos (wm*t); c=Ac* cos (wc*t);   subplot( 5 , 1 , 1 ); mf= 10 ; Sam1=Ac* cos (wc.*t+(mf)* sin (wm.*t)); plot(t,Sam1, 'red' ); legend( 'm=10' );  mf= 12 ; subplot( 5 , 1 , 2 ); Sam=Ac* cos (wc.*t+mf* sin (wm.*t)); plot(t,Sam , 'blue' ); legend( 'm=12' ); xlabel( 'Time' ); ylabel( 'Amplitude' );   subplot( 5 , 1 , 3 ); mf= 15 ; Sam=Ac* cos (wc.*t+(mf)* sin (wm.*t)); plot(t,Sam, 'black' ); legend( 'm=15' );   subplot( 5 , 1 , 4 ); mf= 20 ; Sam=Ac* cos (wc.*t+(mf+ 20 )* sin (wm.*t)); plot(t,Sam, 'green' ); legend( 'm=20' );  subplot( 5 , 1 , 5 ); mf= 15 ; Sam1=Ac* cos (wc.*t+(mf)* sin (wm.*t)); plot(t,m, 'black' ,t,c, 'green' ,t,Sam1, 'blue' ); legend(...








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