Hi Juha,
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.
Your reply is related to running the FFT on the CPU, right? Do you have
any experience running it on the FPGA of the USRP1 or USRP2?
Thomas
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