Re: [Discuss-gnuradio] Latest Hackfest

[Miklos Maroti]

Dear Tom,

I have read about the FEC work done during the Hackfest, so this would
be an appropriate time to bring this up. We have participated in the
Darpa Spectrum Challenge, and developed some good and fast codes.
Specifically, we have a generic convolutional code encoder and decoder
(any R and K is supported, tailbiting can be enabled), with fast SSE
implementation. In the attached BER figure we have used R=1/8, K=9 and
length = 3 bytes = 24 bits for encoding headers. The speed is not much
worse than the spiral generated one. More importantly, we have a
specially crafted version of a repeat accumulate coder/decoder that
can be quickly decoded with SSE. On the figure we have used rates 1/3,
1/2, 1/3 and 4/5 with a payload size of 1440 bytes. On the orbit-lab
machines (core-i7) our SSE code can decode more than 1000 packets per
second on a single core.

I plan to release this code under the GPL (and maybe under an MIT
license as well) after I have a paper written up about it. So the
question would be:

1) how to incorporate this into gnuradio (separate OOT or built in)
2) how to deal with puncturing (we have some good generic solution)
3) how to deal with variable packet lengths and variable rates (have some ides)
4) how mature is the FEC API, can it be modified if needed?

Best,
Miklos


On Thu, Apr 3, 2014 at 7:32 PM, Tom Rondeau <address@hidden> wrote:
> We had our latest GNU Radio Hackfest last week at Ettus Research. It was a
> fantastic week with a lot of good work getting done. If you're interested in
> what we are working on and to get a glimpse of some of the new things we'll
> be rolling out in the next few GNU Radio versions, find our working notes
> here:
>
> http://gnuradio.org/redmine/projects/gnuradio/wiki/Hackfest1403-2
>
> Thanks to everyone who came and hacked with us. Thanks, too, to Ettus
> Research for being great hosts for our motley band of developers!
>
> Tom
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>

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