# \[GSoC\] FEC Update

**URL:** <https://www.ruby-forum.com/t/gsoc-fec-update/230991>\
**Category:** GNU Radio\
**Created:** [July 16, 2014, 1:52pm UTC](https://www.ruby-forum.com/t/gsoc-fec-update/230991 "2014-07-16T13:52:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [July 16, 2014, 1:52pm UTC](https://www.ruby-forum.com/t/gsoc-fec-update/230991/1 "2014-07-16T13:52:44Z")

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Hey all,

I have some updates for you too.  
After some evaluations with my mentors, I started from scratch and  
wrote my own OOT module gr-celec which now contains a working rate 1/n  
Viterbi Decoder which can have as many states as it wants. If it has  
more than 8 it can also use SSE kernels 😃

Results are far better than my efforts to speed up the existing  
gr-trellis.

Complex full euclidean branch metrics with SSE4.1 are approx 4x faster  
than the generic kernels, and Viterbi Path Update kernels with SSE4.1  
are approx 3x faster than the generic ones. I am quite satisfied with  
these results.

You can learn a bit more about it on my blog

> **[Software Development, Open Source and the Internet](http://spectrejan.blogspot.com/)**
>
> Blog about ervything related to Software Development, Open Source and general IT topics.

Now I have to do some cosmetics to gr-trellis/examples and then start  
on the Log-MAP Decoder.

Regards,  
Jan  
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**Author:** ![Jan\_KrS\_mer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b5e925/32.png) [@Jan\_KrS\_mer](https://www.ruby-forum.com/u/Jan_KrS_mer)\
**Post date:** [August 8, 2014, 10:57am UTC](https://www.ruby-forum.com/t/gsoc-fec-update/230991/2 "2014-08-08T10:57:30Z")

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Hey all,

GSoC14 is coming to an end. So one final update before the “pencils  
down” date.  
Max-Log-Map decoder is finished. Code is available on my Github[1].  
More Info in my blog[2].  
So now it is time for code cleanup and documentation.

GSoC14 was fun and I’m looking forward to GRCON now 🙂

Best

- -Jan  
[1] [Spectrejan · GitHub](https://github.com/spectrejan)  
[2] [http://spectrejan.blogspot.de/](http://spectrejan.blogspot.de/)  
On 16.07.2014 13:51, Jan Krmer wrote:

> Regards, Jan

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