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Re2: vrf Raised Cosine

Question asked by VRFuser on May 1, 2006
Latest reply on May 1, 2006 by VRFuser

>Bern and Stan,

>My signal processing is a little rusty, but I believe that a
>multiplication in the frequency domain is a correlation in the time
>domain.  So the process is to fft the signal and the raised cosine,
>multiply the 2 together and then take the inverse fft, and that should be the correlation you are
>looking for.   For this to work quickly, you need your signal lengths to be
>a power of 2 and I think you will need to use the same lengths for both.
>You can do the fft of the raise cosine and save it, so you only need to
>do that calculation once.


Well - just to be picky-- multiplication in one domain corresponds to _convolution_ in the other domain. Similar to correlation though.

In any case if you have time domain processing available you really don't want to do the transforms- just too many gotchas.

correlation _should_ do the job.


Stan Bischof  Agilent Technologies  707-577-3994

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