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AM,FM,PM modulation in matlab

This section of MATLAB source code covers AM,FM,PM modulation in matlab. It mentions the same using modulate matlab function.

Modulate matlab function

%Parameters for signal creation
Fs = 8000; %sampling frequency
t = (0:1000-1)/Fs; %Time vector
s = 4*cos(2*pi*500*t); %modulating signal

sdft = fft(s);
N=length(s);
sdft = sdft(1:N/2+1);
psdy1 = (1/(Fs*N)) * abs(sdft).^2;
psdy1(2:end-1) = 2*psdy1(2:end-1);
freq = 0:Fs/length(s):Fs/2;
figure;plot(freq,10*log10(psdy1)); %FD spectrum of unmodulated signal

y = modulate(s,3e3,Fs,'am',0.1); %modulated signal
ydft = fft(y);
N=length(y);
ydft = ydft(1:N/2+1);
psdy = (1/(Fs*N)) * abs(ydft).^2;
psdy(2:end-1) = 2*psdy(2:end-1);
freq = 0:Fs/length(y):Fs/2;
figure;plot(freq,10*log10(psdy)); %FD spectrum of modulated signal

Output

unmodulated input signal AM modulated signal output

Similar to this FM and PM modulation can also be carried out using modulate function by changing forth argument to 'fm' or 'pm' respectively.


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