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?
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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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