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
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