Re: [Discuss-gnuradio] USRP: FFT on FPGA?

[Matt Ettus]

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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