Phase modulation for square waveform IN MATLAB

MATLAB CODE

fm = 1000;fm=7;

Tm=1/fm;

Ac = 1;

Am=1;

t = 0:Tm/999:Tm*2;

fc =30;

s=square(2*pi*t*fm);

subplot(2,1,1);

plot (t,s);

title ('Square Waveform');

grid on;

K= 2*pi*0.333

y2=Ac*cos(2*pi*fc*t+K*s);

subplot(2,1,2);

plot(t,y2);

grid on;

title('phase Modulated signal');

   

                                                                            Output

Inference:

     In square wave as message signal phase changes from 180

     degrees to -180 degrees so the PM signal also changes direction

     suddenly and give sharp point.