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Re: [Discuss-gnuradio] RFNoC FFT Size

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] RFNoC FFT Size
Date: Thu, 03 Mar 2016 09:45:46 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 03/03/2016 05:21 AM, Simon Olvhammar wrote:

I'm wondering what it would take to modify the current FFT RFNoC block to be able to compute a 8192 channel FFT. Someone that can guide me in the right direction? I'm a quite experienced programmer, however not in HDL.

Best regards

The main current stumbling block to large FFTs in RFNOC is that the FFT output has to be able to fit into a single transport packet, and that is limited to 9000 bytes, which pretty-much limits you to 2048-bin FFTs. There will be work in the future to allow FFT outputs in
  RFNOC to span multiple packets.

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