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Altera_Forum's avatar
Altera_Forum
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15 years ago

wrong data through IFFT, FFT

Hi everyone, I use altera fft ip core 9.0, and let my data go through 1024 ifft - GI - GI_remover - 1024 fft, but i did not get the origin data back(not the scaling problem, the data is totall...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I would recommend that you check your data representation. Ensure that your input data is in the format expected by the FFT component. If your data's time samples span -N/2-N/2, but your fft is configured for natural order, you will have a problem in your output. Since you are recieving the SOP and EOP from the source interface, the issue is probably just a configuration issue.

BTW, what type of signal/data are you analyzing? What is the bandwidth of the signal? Give me a little bit more information about your signal and the configuration and I may be able to provide some additional help. I just spent 2 weeks trying to the FFT in my system working and I finally figured out where all(hopefully) of the pitfalls are.