Normalizing FFT by N or sqrt(N) in MATLAB

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aguntukbd

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I did FFT of a signal in MATLAB. But now I am confused how to normalize it. Whether it should be N or sqrt(N) where N is the length of the signal. Can anyone tell me why & when N or sqrt(N) should be used to normalize?

I have also a basic question. Do we normilize while doing FFT or we normalize it after doing FFT to get PSD?

Thanks in advance
 

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