You may also want to have a look at http://stats.gnuradio.org/ To get a feel for how fast different sdr kernels run on different processing platforms
Tim On Fri, Aug 7, 2015, 11:47 AM Tom Cook <tom.k.c...@gmail.com> wrote: > I'm brand new to SDR and I'm just trying to calibrate my expectations of > what will be possible in real time. I'm hoping someone here can give me a > pointer or two. > > I'm running GNU Radio 3.7.2 on Ubuntu 14.04, having installed from the > Ubuntu repositories. The machine I'm using has an Intel Core i5-2520M > running at 2500MHz. > > I'm constructing flowgraphs in GRC and using an RTL-2832U-based USB dongle > as a receiver. > > I've built a fairly simple broadcast FM stereo receiver as an example. It > has the following components: > * RTL-SDR source (768k sample rate). > * Low pass filter (768k sample rate, 96k cutoff, 4k transition) > * Rational resampler (4x decimation) > * WBFM receiver (quadrature rate 192k) > * Low pass filter (1x decimation, 192k sample rate, 15k cutoff, 2k > transition) > * 2x Band pass filter (1x decimation, 192k sample rate, differing cutoff > and transition) > * Multiply > * Low pass filter (192k sample rate, 15k cutoff, 2k transition) > * Add, subtract > * 2 x rational resampler (4x decimation) > * Audio sink (sample rate 48k) > > My system is not able to run this in realtime, producing regular underruns > (about two per second). Decreasing the receiver sample rate to 384k and > decreasing the decimation factor in the first resampler to 2 allows it to > run in without underruns, from which I deduce that the CPU is right on the > edge of being able to process the flowchart in realtime. > > Are my expectations of what I'll be able to do in realtime unreasonably > high? Is there something I'm missing, that I can do to make this run much > faster? > > Thanks, > Tom > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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