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what are the output pwelch units

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Armindo
Armindo 2016-3-4
回答： Star Strider 2016-3-4
Iam using pwelch as:
dat = data; % in uv
win = 1024;
wlen= hamming(win);
nfft = win;
SpectType = 'psd';
Noverlap = [];
Fs = 1000;
[Pxx,f] = pwelch(dat,wlen,Noverlap,nfft,Fs,SpectrumType);
plot(f,Pxx,'r','LineWidth',1);
xlabel('Frequency (Hz)')
ylabel('PSD (uV ^{2} / Hz)');
My question is considering that the units of dat are in uV the Y-axis of pwelch output will be in uV^2/Hz right? In other words the ylabel is correct right?

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Star Strider
Star Strider 2016-3-4
As I read the documentation on pwelch, your ylabel is correct. The pwelch function would output the power at each frequency, and power is essentially amplitude squared.

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