How would you compare the SNR gain from a longer FFT (more samples) to overlapping FFTs? Given the choice, which one would you pick and why?
Update: Suppose you have 2048 samples of a signal. Assuming the sampling rate divided by the fundamental frequency is an integer, compare/constrast the SNR gain/noise variance reduction of the following:
- A single 2048 point FFT.
- 16, 128 point FFTs added coherently.
- 16, 128 point FFTs added incoherently.
- 24, 128 point FFTs (50% overlap), added incoherently.