Systematic POLAR Decoder SC Definition: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Standard systematic successive cancellation (SC) decoder for POLAR codes
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.
It expects float input with bits mapped 1 --> 1, 0 --> -1
Or: f = 2.0 * bit - 1.0


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
Systematic encoding indicates that the info bit values are present in the codeword. 'info_bit_positions' may be obtained by ordering all non frozen_bit_positions in increasing order. One may extract them at their positions after a bit reversal operation. encoder -> decoder chain would need additional bit-reversal after encoding + before decoding. This is unnecessary.


== 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
 
; Block size (N)
: Codeword size. MUST be a power of 2.
 
; #Info Bits (K)
: Represents the number of information bits in a block. Also called frame_size. <= block_size
 
; Frozen Bit Positions
: Integer vector which defines the position of all frozen bits in a block. Its size MUST be equal to block_size - num_info_bits. Also it must be sorted and every position must only occur once.


== Example Flowgraph ==
== Example Flowgraph ==
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; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/lib/polar_decoder_sc_systematic.cc]
 
: [https://github.com/gnuradio/gnuradio/blob/master/gr-fec/lib/polar_common.cc Common code]
; 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/polar_decoder_sc_systematic.h]


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

Latest revision as of 01:46, 22 July 2020

Standard systematic successive cancellation (SC) decoder for POLAR codes

It expects float input with bits mapped 1 --> 1, 0 --> -1 Or: f = 2.0 * bit - 1.0

Systematic encoding indicates that the info bit values are present in the codeword. 'info_bit_positions' may be obtained by ordering all non frozen_bit_positions in increasing order. One may extract them at their positions after a bit reversal operation. encoder -> decoder chain would need additional bit-reversal after encoding + before decoding. This is unnecessary.

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
Block size (N)
Codeword size. MUST be a power of 2.
#Info Bits (K)
Represents the number of information bits in a block. Also called frame_size. <= block_size
Frozen Bit Positions
Integer vector which defines the position of all frozen bits in a block. Its size MUST be equal to block_size - num_info_bits. Also it must be sorted and every position must only occur once.

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.

Source Files

C++ files
[1]
Common code
Public header files
[2]
Block definition
[3]
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