Hi Ruben, thanks for your question to the new FFT+CP feature.
1. The question regarding the delay: you can use the ofdm_loopback.py example (probably renamed to fft_loopback.py when officially released) to calibrate the exact actual delay of the complete processing chain, including RF. Don’t provide CP insertion/removal values (no —cp-list/-p flag) and find the delay (number of samples as —delay/-d flag) where you see a sharp peak in the diagrams shown in the second row (=amplitude of the received signal). Note that symbol #0 has minor transient effects but all other symbols should have a sharp peak. 188 samples is what we measured for the 200 MHz bitfile, which value do you determine? 2. As you noticed, the pre-release version in branch fft_cp_preview2 has a limitation that only two (“0,1” / “2,3) or four channels (“0,1,2,3”) are supported. Kind regards,\ Jörg
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