LDPC Decoder Definition: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
This is a soft-decision decoder that uses belief propagation (also known as message passing) that is described at:
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]].  This first section should describe what the block does and how to use it, using however many paragraphs necessary.  Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
[http://www.cs.toronto.edu/~radford/ftp/LDPC-2012-02-11/decoding.html]
 
Designed for a memoryless AWGN channel, it assumes a noise variance of the value specified for sigma.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Param 1 (''R'')
; Parallelism
: Description of parameter, provide any tips or recommended values.  Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
: For parallel execution of multiple instances of the block (more info is needed on this)
 
; Dimension 1
: For parallelism
 
; Dimension 2
: For parallelism


; Param 2
; AList file
: blah blah blah
: Name of an alist file to use.
 
; Sigma
: Noise variance of the channel
 
; Max iterations
: Maximum number of iteration for the message passing algorithm


== Example Flowgraph ==
== Example Flowgraph ==


Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
This flowgraph can be found at [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/examples/fecapi_ldpc_decoders.grc]
 
[[File:Fecapi_ldpc_decoders_fg.png|800px]]


== Source Files ==
== Source Files ==


; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/lib/ldpc_decoder.cc]
 
; Header files
: [https://github.com/gnuradio/gnuradio TODO]


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/include/gnuradio/fec/ldpc_decoder.h]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/grc/ldpc_decoder_def_list.block.yml]

Latest revision as of 13:37, 21 December 2021

This is a soft-decision decoder that uses belief propagation (also known as message passing) that is described at:

[1]

Designed for a memoryless AWGN channel, it assumes a noise variance of the value specified for sigma.

Parameters

Parallelism
For parallel execution of multiple instances of the block (more info is needed on this)
Dimension 1
For parallelism
Dimension 2
For parallelism
AList file
Name of an alist file to use.
Sigma
Noise variance of the channel
Max iterations
Maximum number of iteration for the message passing algorithm

Example Flowgraph

This flowgraph can be found at [2]

Fecapi ldpc decoders fg.png

Source Files

C++ files
[3]
Public header files
[4]
Block definition
[5]
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