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Re: [Discuss-gnuradio] USRP: FFT on FPGA?
From: |
Matt Ettus |
Subject: |
Re: [Discuss-gnuradio] USRP: FFT on FPGA? |
Date: |
Thu, 08 Feb 2007 18:51:38 -0800 |
User-agent: |
Thunderbird 1.5.0.9 (X11/20070104) |
Jens Elsner wrote:
> is it feasible to implement an FFT directly on the
> FPGA in the USRP?
>
Possible, yes, but the FPGA does not have any "hard" multipliers, so
you'll need to use logic cells for that. But I don't think it is necessary.
> I would like to use the USRP for spectral analysis,
> a 512-point FFT (and windowing) would greatly reduce
> CPU load. A "hardware" FFT would also be a great plus
> for OFDM waveforms.
>
The CPU on the host machine is very capable of high-speed FFTs. We can
easily do thousand point FFTs on 8 MS/s data streams.
> I don't have any experience in FPGA programming,
> just wondering if it's possible.
>
> Best regards,
> Jens
>
>
>
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