Hi, Gnuradio uses FFTW, which as a pretty nice benchmark page [1]. If we look at the results for a fairly new intel processor, we see that a 262144 point FFT can be computed with about 9 GFLOPS speed, which means that a 262144 point FFT should be done in less than 3 ms.
[1] http://www.fftw.org/speed/ I have been using 65 kpoint FFTs for real-time spectral analysis with USRP1 and USRP2 with no problems. juha On Mon, Aug 23, 2010 at 08:00, Thomas Hobiger <hobi...@nict.go.jp> wrote: > We are considering to purchase a USRP2 + a DBSRX board in order to utilize > it for some GPS stuff. Thus it would be interesting to know what's the > maximum supported (implemented) FFTs size. I have checked the old > discussions, but there's nothing really conclusive. What we are looking for > is something larger than 16K FFT points. > Maybe someone has experiences with such large FFTs and how they perform > (Flops or FFTs per second)? > > Best regards, > Thomas Hobiger > > -- > ****************************************************************** > Dr. Thomas Hobiger > Space-Time Measurement Project > Space-Time Standards Group > New Generation Network Research Center > National Institute of Information and Communications Technology > ------------------------------------------------------------------ > 4-2-1 Nukui-Kitamachi, Koganei > 184-8795 Tokyo > Japan > ------------------------------------------------------------------ > email: hobi...@nict.go.jp > ------------------------------------------------------------------ > homepage (priv.): http://www.hobiger.org > ****************************************************************** > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
