neoflash wrote on May 5th, 2009, 8:15pm:I think calculating FFT is a good idea. But calculating Rx is more practical a idea and easier to implement.
The statistics could be collected over time and updated in a accumulator.
Thanks.
That is a strange comment to make since autocorrelation (Rx) and power spectral density (based on FFT) provide identical information, provided that they are used correctly, and ideally both are computed to provide an overview in time- and frequency- domains.
As for computation, I don't believe that one or the other is more difficult. Matlab for instance will give you both in a flash. In the old days, it might have been computationally easier to compute Rx than the FFT but I think those were very old days.
Vivek