On Thu, Jul 2, 2015 at 8:10 PM, bob wole <bnw...@gmail.com> wrote: > > > On Tue, Jun 30, 2015 at 2:00 PM, bob wole <bnw...@gmail.com> wrote: > >> >> >> On Tue, Jun 16, 2015 at 11:45 PM, bob wole <bnw...@gmail.com> wrote: >> >>> >>> >>> On Tue, Jun 16, 2015 at 11:41 PM, Tom Rondeau <t...@trondeau.com> wrote: >>> >>>> On Tue, Jun 16, 2015 at 1:03 PM, bob wole <bnw...@gmail.com> wrote: >>>> >>>>> >>>>> >>>>>> On 16.06.2015 08:26, bob wole wrote: >>>>>> > Hi, >>>>>> > >>>>>> > I just stared working on FEC in gnuradio. I found that there is >>>>>> > gr-fec. I want to know that which literature , books/papers, was >>>>>> > followed during the implementation of the gr-fec so that I can go >>>>>> > through the c++ implementation more productively and add >>>>>> > something. >>>>>> > >>>>>> > >>>>>> > -- Bob >>>>>> > >>>>>> - >>>>>> >>>>>> > Hi, >>>>>> > >>>>>> > I just stared working on FEC in gnuradio. I found that there is >>>>>> gr-fec. I >>>>>> > want to know that which literature , books/papers, was followed >>>>>> during the >>>>>> > implementation of the gr-fec so that I can go through the c++ >>>>>> > implementation more productively and add something. >>>>>> > >>>>>> > >>>>>> > -- >>>>>> > Bob >>>>>> > >>>>>> >>>>>> Hi Bob, >>>>>> >>>>>> Have a look at the manual. The API itself is quite well described I >>>>>> think: >>>>>> >>>>>> http://gnuradio.org/doc/doxygen/page_fec.html >>>>>> >>>>>> It doesn't cover the very recently added TPC and LDPC implementations. >>>>>> http://gnuradio.org/doc/doxygen/classgr_1_1fec_1_1ldpc__decoder.html >>>>>> http://gnuradio.org/doc/doxygen/classgr_1_1fec_1_1ldpc__decoder.html >>>>>> http://gnuradio.org/doc/doxygen/classgr_1_1fec_1_1tpc__encoder.html >>>>>> http://gnuradio.org/doc/doxygen/classgr_1_1fec_1_1tpc__decoder.html >>>>>> >>>>>> Those could use work on their documentation. >>>>>> >>>>>> We're also about to merge in another approach to LDPC encoding and >>>>>> decoding >>>>>> based on Tracie Perez's GSoC work. You can see the wip branch here: >>>>>> >>>>>> https://github.com/trondeau/gnuradio/tree/fec/ldpc_methods >>>>>> >>>>>> And the GSoC presentations: >>>>>> http://www.trondeau.com/grcon2013-presentations#gsoc-perez >>>>>> http://www.trondeau.com/grcon2013-presentations#gsoc-manu >>>>>> >>>>>> Johannes Demel is working on polar codes this summer. >>>>>> >>>>>> 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: >>>>>> >>>>>> http://www.trondeau.com/grcon14-presentations#tut-mccarthy >>>>>> 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 >>>>> >>>>> 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? >>>>> >>>>> -- >>>>> 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 >>>> >>>> >>> 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 <module> >> 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 <module> >> 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 ? >> >> -- >> Bob >> > > > Any comments on it ? > > -- > Bob >
I hope somebody would reply on this. -- Bob
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
