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how to calculate and plot power spectral density of a given signal?

 I have signal and i want to plot it's power spectral density , What should i do? is it right if i first calculate the FFT of a signal and then get the square abs of it's value?



 NOTE:-


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If you have the Signal Processing Toolbox, it is easiest to use periodogram().
 
That handles all the scaling for you.
 
 
 
 Fs = 1000;

 t = 0:1/Fs:1-1/Fs;

 x = cos(2*pi*100*t)+randn(size(t));

 [Pxx,F] = periodogram(x,[],length(x),Fs);

 plot(F,10*log10(Pxx))
 
 
If you do not have the Signal Processing Toolbox, the PSD is proportional to the absolute value squared of the DFT (calculated by fft())


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