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From: | Thomas Hobiger |
Subject: | Re: [Discuss-gnuradio] Large FFTs |
Date: | Tue, 24 Aug 2010 07:53:59 +0900 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.11) Gecko/20100720 Fedora/3.0.6-1.fc12 Lightning/1.0b2pre Mnenhy/0.8.3 Thunderbird/3.0.6 |
Hi Juha,
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?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.
Thomas
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