RE: [ATM] Accuracy of Mahajan's approximation for Strehl ratio

["Koehler, Steve" <Steve_Koehler@securecomputing.com>]

Mike,

> >You note that Mahajan is pessimistic for larger RMS errors.  Is it
> >possible that
> >your directly calculated Strehl ratio is inaccurate (optimistic?)
> >for larger RMS
> >errors, because the calculation is discrete?
> 
> Maybe. I guess the way to find out is to use a larger FFT. I think I
> have enough memory to try it, and CPU cycles are cheap.

Another possibility would be to start with very small FFT arrays, and look at
how the values change as they approach the sizes we typically use.  It is likely
that any change is asymptotic, and you can get a reading on the point of
diminishing returns from the shape of the curve.

-- Steve Koehler
   steve_koehler@securecomputing.com

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