Hi, I am just getting started on some custom RFNoC development and trying to decide how to approach the problem. Essentially, I want to implement a pair of filters in the frequency domain. It is similar to a pair of FIR filters (on a block-by-block basis) but I want the capability for very long filters (equal in length to FFT size). I expect that it is not possible to have so many taps using the existing FIR filter so that is why I want to apply in the freq domain.
I noticed that there is a Window RFNoC block that could be used as part of my development, but it appears that this window uses "real" rather than "complex" coefficients. Anyway, here are the steps I want to implement: 1. FFT incoming stream 2. Split FFT output into two streams 3. Multiply Stream 1 by complex filter 1 (same length as FFT) 4. Multiply Stream 2 by complex filter 2 (same length as FFT) 5. IFFT Stream 1 6. IFFT Stream 2 I considered modifying the existing window.v to handle complex coefficients. I also considered using the new "replay" NOC block to store the coefficients and stream them out in a circular fashion. This might use the "multiply.v" component, but again it would need to be modified to handle complex multiplies. Anyway, as I am just getting started, I am looking for any helpful advice. Thanks. Rob
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