Hello,
I am trying to implement the zoom FFT algorithm in MATLAB so as to compare its results to those of other algorithms I am developing. I am using raw adc data from the DCA1000. Finding a peak from the coarse 1D FFT is simple enough, but I am confused as to what to do after that. The related post says to "multiply a set of twiddles to the input signal and find the indices"--find the indices of what exactly? How do the indices of the peak from the coarse FFT have any bearing on this next step, if at all?
Thank you,
Josh
