Honored ContributorHi all!
For me is very interesting can I use FFT for filtering purposes or I should only use FIR convolution? And if FFT is useful in that case, there is a boundary between it and for for the effective usage in terms of resource usage and so on.
Honored ContributorLower frequency and/or lower hardware resources.
In my use case, I am basically using 1 windowed 256 point FFT that is acting like 127 individual band pass filters and demodulators. The amount of hardware required to do this with classical fir filters is large or must be ran at extreme clock rates. That being said the windowing plays a critical roll in the "achieved" filtering. If you do not window the incoming data, the channels will interfere with each other (Basically you have a very poor band pass filter) because of the discontinuities at the FFT data boundaries. Using a WOLA (basically having a larger window than your FFT size) technique to can achieve great results. PeteHonored ContributorThank you very much, Pete!
