Decode CCSDS 27: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
A rate 1/2, k=7 convolutional decoder for the CCSDS standard.
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.
This block performs soft-decision convolutional decoding using the Viterbi algorithm.  The input is a stream of (possibly noise corrupted) floating point values nominally spanning [-1.0, 1.0], representing the encoded channel symbols 0 (-1.0) and 1 (1.0), with erased symbols at 0.0.
 
The output is MSB first packed bytes of decoded values.
As a rate 1/2 code, there will be one output byte for every 16 input symbols.
This block is designed for continuous data streaming, not packetized data. The first 32 bits out will be zeroes, with the output delayed four bytes from the corresponding inputs.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
None
 
; Param 1 (''R'')
: 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).
 
; Param 2
: blah blah blah


== Example Flowgraph ==
== Example Flowgraph ==
 
[[File:Decode_ccsds_27_fg.png|800px]]
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.
<p>This flowgraph can be downloaded from [[Media:Decode_ccsds_27.grc]].</p>


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

Latest revision as of 17:20, 3 May 2025

A rate 1/2, k=7 convolutional decoder for the CCSDS standard.

This block performs soft-decision convolutional decoding using the Viterbi algorithm. The input is a stream of (possibly noise corrupted) floating point values nominally spanning [-1.0, 1.0], representing the encoded channel symbols 0 (-1.0) and 1 (1.0), with erased symbols at 0.0.

The output is MSB first packed bytes of decoded values. As a rate 1/2 code, there will be one output byte for every 16 input symbols. This block is designed for continuous data streaming, not packetized data. The first 32 bits out will be zeroes, with the output delayed four bytes from the corresponding inputs.

Parameters

None

Example Flowgraph

Decode ccsds 27 fg.png

This flowgraph can be downloaded from Media:Decode_ccsds_27.grc.

Source Files

C++ files
TODO
Header files
TODO
Public header files
TODO
Block definition
TODO
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