# Re: FEC in gnruadio **URL:** \ **Category:** GNU Radio\ **Created:** [June 16, 2015, 7:04pm UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339 "2015-06-16T19:04:33Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Post date:** [June 16, 2015, 7:04pm UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339/1 "2015-06-16T19:04:33Z")
> > implementation of the gr-fec so that I can go through the c++ > > We’re also about to merge in another approach to LDPC encoding and decoding > What’s your particular interest in FEC? Are you looking to use it or > implement other codes not already in gr-fec? For the FEC API itself, there > is no other reference than the manual page and a presentation from the > original author at our GRCons: > > [GRCon14 - Presentations — Rondeau Research](http://www.trondeau.com/grcon14-presentations#tut-mccarthy) > [GRCon2013 - Presentations — Rondeau Research](http://www.trondeau.com/grcon2013-presentations#tut-mccarthy) > > Tom Hi Tom, Thanks for the links. I am targeting Turbo Codes mainly for short frame size. I found one presentation on turbo codes [http://gnuradio.squarespace.com/storage/grcon14/presentations/Sep18\_02\_Karra\_TurboCodes.pdf](http://gnuradio.squarespace.com/storage/grcon14/presentations/Sep18_02_Karra_TurboCodes.pdf) but I could not find its source code in gnuradio. Are Turbo codes implemented in gnuradio? if yes, in which version can I find it? One more question, I am targeting short frame length burst, currently which FEC in gnuradio can give me best gain in this case? ---
**Author:** ![bob\_wole](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b4bc9f/32.png) [@bob\_wole](https://www.ruby-forum.com/u/bob_wole)\ **Post date:** [June 16, 2015, 8:42pm UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339/2 "2015-06-16T20:42:44Z")
On Tue, Jun 16, 2015 at 1:03 PM, bob wole [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > > > > > the > > Have a look at the manual. The API itself is quite well described I think: > > > > Johannes D. is working on polar codes this summer. > > implemented in gnuradio? if yes, in which version can I find it? One more > question, I am targeting short frame length burst, currently which FEC in > gnuradio can give me best gain in this case? > > – > Bob Bob, Yes, Kiran’s TPC work has been integrated as of 3.7.7.1. (I even pointed out the links to the manual pages for the tpc\_encoder and tpc\_decoder above.) Tom ---
**Author:** ![bob\_wole](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b4bc9f/32.png) [@bob\_wole](https://www.ruby-forum.com/u/bob_wole)\ **Post date:** [June 16, 2015, 8:46pm UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339/3 "2015-06-16T20:46:15Z")
On Tue, Jun 16, 2015 at 11:41 PM, Tom R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > > through the c++ implementation more productively and add > > > > gr-fec. I > > > > Hi Bob, > > > > [GNU Radio Manual and C++ API Reference: gr::fec::tpc\_decoder Class Reference](http://gnuradio.org/doc/doxygen/classgr_1_1fec_1_1tpc__decoder.html) > > > > [GRCon2013 - Presentations — Rondeau Research](http://www.trondeau.com/grcon2013-presentations#gsoc-perez) > > > > [GRCon14 - Presentations — Rondeau Research](http://www.trondeau.com/grcon14-presentations#tut-mccarthy) > > Bob, > > Yes, Kiran’s TPC work has been integrated as of 3.7.7.1. (I even pointed > out the links to the manual pages for the tpc\_encoder and tpc\_decoder > above.) > > Tom Thanks Tom, I am going to test them soon for my bursty system 🙂 Lets see how it works. ---
**Author:** ![bob\_wole](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b4bc9f/32.png) [@bob\_wole](https://www.ruby-forum.com/u/bob_wole)\ **Post date:** [July 2, 2015, 5:11pm UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339/4 "2015-07-02T17:11:19Z")
On Tue, Jun 30, 2015 at 2:00 PM, bob wole [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > > > > implementation of the gr-fec so that I can go through the c++ > > > > > > think: > > > > > > > > > > Johannes D. is working on polar codes this summer. > > > > > Tom > > > > > but I could not find its source code in gnuradio. Are Turbo codes > > > > > Yes, Kiran’s TPC work has been integrated as of 3.7.7.1. (I even pointed > > in gnuradio/gr-fec/examples/ > fec.extended\_encoder(encoder\_obj\_list=enc, threading=‘capillary’, > > File “/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top\_block.py”, > > fecapi\_async\_decoders.grc runs without any errors. > > Any Ideas what could be wrong ? > > – > Bob Any comments on it ? ---
**Author:** ![bob\_wole](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b4bc9f/32.png) [@bob\_wole](https://www.ruby-forum.com/u/bob_wole)\ **Post date:** [July 3, 2015, 8:17pm UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339/5 "2015-07-03T20:17:50Z")
On Thu, Jul 2, 2015 at 8:10 PM, bob wole [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > On Tue, Jun 16, 2015 at 11:41 PM, Tom R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > > > > > > > > followed during the implementation of the gr-fec so that I can go > > > > > > > I just stared working on FEC in gnuradio. I found that there is > > > > > > > > > > > > [GNU Radio Manual and C++ API Reference: gr::fec::tpc\_encoder Class Reference](http://gnuradio.org/doc/doxygen/classgr_1_1fec_1_1tpc__encoder.html) > > > > > > And the GSoC presentations: > > > > > > Thanks Tom, > > > gnuradio version 3.7.7.1 > > > File “/home/gnuradio/gr-fec/examples/ber\_test.py”, line 267, in > > > File “/usr/local/lib/python2.7/dist-packages/gnuradio/fec/bitflip.py”, > > > Traceback (most recent call last): > > > RuntimeError: boost::thread\_resource\_error: Resource temporarily > > Any comments on it ? > > – > Bob I hope somebody would reply on this. ---
**Author:** ![bob\_wole](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b4bc9f/32.png) [@bob\_wole](https://www.ruby-forum.com/u/bob_wole)\ **Post date:** [June 30, 2015, 11:01am UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339/6 "2015-06-30T11:01:49Z")
On Tue, Jun 16, 2015 at 11:45 PM, bob wole [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > > > > > > > > > > > > – > > > > > It doesn’t cover the very recently added TPC and LDPC implementations. > > > > > > > > there > > > > Tom > > Thanks Tom, > > I am going to test them soon for my bursty system 🙂 Lets see how it works. > > – > Bob Hi list, gnuradio version 3.7.7.1 ubunutu 14.04 32-bit I am trying to use gr-fec and I am having issues running examples located in gnuradio/gr-fec/examples/ When I run ber\_test.grc I get following error Using Volk machine: avx\_32\_mmx\_orc Traceback (most recent call last): File “/home/gnuradio/gr-fec/examples/ber\_test.py”, line 267, in tb = ber\_test() File “/home/gnuradio/gr-fec/examples/ber\_test.py”, line 159, in **init** self.fec\_extended\_encoder\_0 = fec.extended\_encoder(encoder\_obj\_list=enc, threading=‘capillary’, puncpat=“puncpat”) File “/usr/local/lib/python2.7/dist-packages/gnuradio/fec/extended\_encoder.py”, line 64, in **init** self.blocks.append(fec.puncture\_bb(len(puncpat), read\_bitlist(puncpat), 0)) File “/usr/local/lib/python2.7/dist-packages/gnuradio/fec/bitflip.py”, line 47, in read\_bitlist if int(bitlist[i]) == 1: ValueError: invalid literal for int() with base 10: ‘p’ > > > Done (return code 1) When I run tpc\_ber\_curve\_gen.grc I get following error Using Volk machine: avx\_32\_mmx\_orc Traceback (most recent call last): File “/home/gnuradio/gr-fec/examples/tpc\_ber\_curve\_gen.py”, line 450, in tb.start() File “/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top\_block.py”, line 106, in start top\_block\_start\_unlocked(self.\_impl, max\_noutput\_items) File “/usr/local/lib/python2.7/dist-packages/gnuradio/gr/runtime\_swig.py”, line 4860, in top\_block\_start\_unlocked return \_runtime\_swig.top\_block\_start\_unlocked(\*args, \*\*kwargs) RuntimeError: boost::thread\_resource\_error: Resource temporarily unavailable > > > Done fecapi\_async\_decoders.grc runs without any errors. Any Ideas what could be wrong ?