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MATLAB code for phase modulation

 Theory

Phase modulation is a modulation pattern for conditioning communication signals for transmission. In phase modulation carrier signal phase changes w.r.t message signal.



                                                                                    MATLAB Code



fm = 1000;

fc =10*10^3;

Am = 1;

K=2*pi*5;

Ac = 1;


Tm = 1/fm;

Tc = 1/fc;


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

%message signal plot

modulating_signal = Am*sin(2*pi*fm*t);

subplot(2,1,1);

plot(t, modulating_signal);

grid on;

title('message signal');

xlabel('time');

ylabel('amplitude')

%phase modulation signal plot with Am=5

y1=Ac*cos(2*pi*fc*t+K*modulating_signal);

subplot(2,1,2);

plot(t,y1);

grid on;

title('phase Modulated signal');

xlabel('time');

ylabel('amplitude')


                                                                                Output




On increasing amplitude output changes as


Inferences

When message signal is increasing, the phase change is positive w.r.t carrier signal, so the PM signal wave form

 is more dense.

If message signal is decreasing, the phase change is negative w.r.t carrier wave so the output waveform is less dense. 


 




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