plot white noise PSD in matlab?

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fanshuo

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noise psd

how to do that without using "psd" command?
Thanks!
 

psd white noise

calculate the power spectral density using mathematical expressions and then plot the array.

Simple
 

power spectral density matlab

there is a scaling factor after the fft to make it a unitary transform
what is that?
 

psd noise

you can see fft of x as
y=fft(x,512);
df=fs/512;
m=fftshift(abs);
m=m.^2;
m1=20*log10(m);
p=unwrap(angle);
f = -(fs/2)+df:dffs/2);
%f=(0:length-1)*fs/length;
figure;
plot(f,m1);title('magnitude')
 

Re: psd noise

atulbhatia said:
you can see fft of x as
y=fft(x,512);
df=fs/512;
m=fftshift(abs);
m=m.^2;
m1=20*log10(m);
p=unwrap(angle);
f = -(fs/2)+df:dffs/2);
%f=(0:length-1)*fs/length;
figure;
plot(f,m1);title('magnitude')
Click to expand...

f = -(fs/2):dffs/2)-df; would be better
 

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