Re: [Discuss-gnuradio] MAC layer questions

[Morgan Redfield]

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?

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
<address@hidden> 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: address@hidden, Web: http://www.tu-ilmenau.de/ics
> Office: Zuse Building, room 1071
>
>
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