FEC in gnruadio

GNU Radio
1

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.

2

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Hey Bob,

the main idea is to have drop-in blocks for different codes. Have a
look at ‘encoder.h’ and the ‘_impl.*’ files. They describe the
framework. In ‘generic_encoder.h’ is a description for all the
required and available functions for all the different codes. So your
encoder/decoder just inherits from ‘generic_encoder’. Your inherited
coder class implements a code and exposes all necessary information
for the block which may be part of the stream based GNU Radio
framework or may use message passing. For details see [1]

I hope this helps.

Cheers
Johannes

[1] GNU Radio Manual and C++ API Reference: Forward Error Correction

On 16.06.2015 08:26, bob wole wrote:

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3

On Tue, Jun 16, 2015 at 2:26 AM, bob wole [email protected] wrote:

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 D. 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