LDPC Encoder Definition (via Generator): Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
A standard encoder class. This method is discussed in many textbooks; one is: Turbo Coding for Satellite and Wireless Communications by Soleymani, Gao, and Vilaipornsawai.
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.
 
Given a generator matrix in systematic form, G = [I|P], where I is the identity matrix and P is the parity submatrix, the information word s is encoded into a codeword x via:
 
x = G'*s


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.


== 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)


; Param 2
; Dimension 1
: blah blah blah
: For parallelism
 
; Dimension 2
: For parallelism
 
; LDPC generator matrix
: The ldpc_G_matrix object to use for encoding.


== 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_encoders.grc]
 
[[File:Fecapi_ldpc_encoders_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_gen_mtrx_encoder_impl.cc]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/lib/ldpc_gen_mtrx_encoder_impl.h]


; 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_gen_mtrx_encoder.h]


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

Latest revision as of 13:54, 3 December 2020

A standard encoder class. This method is discussed in many textbooks; one is: Turbo Coding for Satellite and Wireless Communications by Soleymani, Gao, and Vilaipornsawai.

Given a generator matrix in systematic form, G = [I|P], where I is the identity matrix and P is the parity submatrix, the information word s is encoded into a codeword x via:

x = G'*s


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
LDPC generator matrix
The ldpc_G_matrix object to use for encoding.

Example Flowgraph

This flowgraph can be found at [1]

Fecapi ldpc encoders fg.png

Source Files

C++ files
[2]
Header files
[3]
Public header files
[4]
Block definition
[5]
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