Frequency modulation by MATLAB

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adnan
adnan 2011-1-27
I hope to write a program in MATLAB to plot the output of the following function in time domain
s(t) = A sum ( J(B) cos((Wc-n.Wm).t )
where
  • A is a constant = 1
  • J Bessel function of B
  • B = 10 (modulation index)
  • Wc = 1000000 carrier frequency
  • Wm = 1000
  • Limits of summation n = -20 to 20
Hint: all values above changeable

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回答（1 个）

Vieniava
Vieniava 2011-1-27
From the top of my head:
Fc=1e6; % carrier 1MHz
Fm=1e3; % single tone - 1kHz
fs=2.2*Fc; % sampling frequency (Nyquist limitation!)
t=0:1/fs:1;
Y=zeros(1,length(t));
for n=-20:20
Y=Y+besselj(n, B).*cos( 2*pi*(Fc-n*Fm).*t);
end
Should work (right now I can't vertify this code - lack of Matlab)

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