On 07/06/2011 07:33 PM, Morgan Redfield wrote: > I'm still working on my MAC, and there's a lot of room for > improvement. At the moment, I get throughput of about 1kbps. What kind > of throughput are you getting?
In a setup of two nodes we have a end-to-end throughput (measured using iperf using TCP as transport protocol) of around 150-200 kbps. But that certainly depends on physical layer parameters as well. At the moment we use a sampling rate of 1Mbps and Bpsk modulation. Parameters still need to be fine-tuned (SIFS, DIFS, etc.), so there is definitely room for improvements. What PHY are you using? Regards, Andre > > Andre and George, thanks for pointing me to those papers. I'll look > through them and see if I can figure out any ways to improve my MAC. > > Morgan > > On Tue, Jul 5, 2011 at 4:30 AM, Andre Puschmann > <andre.puschm...@tu-ilmenau.de> wrote: >> On 07/01/2011 03:16 AM, Morgan Redfield wrote: >>> Hi, >>> >>> I've been working on building a CSMA/CA MAC for the past couple of >>> weeks. I built it in Python, and used ofdm/tunnel.py as a guide. It's >>> working now, but I don't think it's very efficient. I ended up having >>> to relax a lot of timing parameters to get it working, so my >>> throughput is pretty bad. I also get a lot of dropped packets. I think >>> this is also because my timing isn't very accurate, and I end up with >>> more collisions than I would expect. >>> >>> I was wondering if anyone else had had any luck building a CSMA/CA >>> MAC. I saw a few posts on the mailing list from several years ago >>> about people who were working on it, but I don't see any example code >>> anywhere. I also checked out CMUmacs on CGRAN, but that relies on a >>> deprecated version of GNURadio. >>> >>> Is my best bet to rewrite the MAC as a block in C++? Can anyone tell >>> me what kind of speedup that's likely to get me? >>> >>> Thanks, >>> Morgan Redfield >> >> Hi Morgan, >> >> we are also working on a CSMA/CA MAC here using a SDR software called >> Iris (I know that's the GNU radio list but problems are pretty much the >> same in terms of timing). The implementation is still not perfect but we >> got some nice results already. >> >> May I ask you about the throughput of your system? I would really like >> to compare them with our setup. >> >> There is also another paper titled "An IEEE 802.11 MAC Software Defined >> Radio Implementation for Experimental Wireless Communications and >> Networking Research" which might be of interest for you. >> >> >> Regards, >> Andre >> >> >> -- >> André Puschmann >> Ilmenau University of Technology, Integrated Communication Systems Group >> Phone: +49 3677 69-4132, Fax: +49 3677 69-1614 >> Email: andre.puschm...@tu-ilmenau.de, Web: http://www.tu-ilmenau.de/ics >> Office: Zuse Building, room 1071 >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> -- André Puschmann Ilmenau University of Technology, Integrated Communication Systems Group Phone: +49 3677 69-4132, Fax: +49 3677 69-1614 Email: andre.puschm...@tu-ilmenau.de, Web: http://www.tu-ilmenau.de/ics Office: Zuse Building, room 1071 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
