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decoder.rst
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decoder.rst
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.. _dec-turbo_db-decoder-parameters:
Turbo |DB| Decoder parameters
-----------------------------
.. _dec-turbo_db-dec-type:
``--dec-type, -D``
""""""""""""""""""
:Type: text
:Allowed values: ``TURBO_DB`` ``CHASE`` ``ML``
:Default: ``TURBO_DB``
:Examples: ``--dec-type CHASE``
|factory::Decoder::p+type,D|
Description of the allowed values:
+--------------+---------------------------+
| Value | Description |
+==============+===========================+
| ``TURBO_DB`` | |dec-type_descr_turbo_db| |
+--------------+---------------------------+
| ``CHASE`` | |dec-type_descr_chase| |
+--------------+---------------------------+
| ``ML`` | |dec-type_descr_ml| |
+--------------+---------------------------+
.. |dec-type_descr_turbo_db| replace:: Select the standard Turbo decoder.
.. |dec-type_descr_chase| replace:: See the common :ref:`dec-common-dec-type`
parameter.
.. |dec-type_descr_ml| replace:: See the common :ref:`dec-common-dec-type`
parameter.
.. _dec-turbo_db-dec-implem:
``--dec-implem``
""""""""""""""""
:Type: text
:Allowed values: ``STD``
:Default: ``STD``
:Examples: ``--dec-implem STD``
|factory::Decoder::p+implem|
Description of the allowed values:
+-----------+--------------------------+
| Value | Description |
+===========+==========================+
| ``STD`` | |dec-implem_descr_std| |
+-----------+--------------------------+
.. |dec-implem_descr_std| replace:: Select the |STD| implementation.
.. _dec-turbo_db-dec-sub-type:
``--dec-sub-type, -D``
""""""""""""""""""""""
Please refer to the |RSC| |DB| :ref:`dec-rsc_db-dec-type` parameter.
.. _dec-turbo_db-dec-sub-implem:
``--dec-sub-implem``
""""""""""""""""""""
Please refer to the |RSC| |DB| :ref:`dec-rsc_db-dec-implem` parameter.
.. _dec-turbo_db-dec-crc-start:
``--dec-crc-start``
"""""""""""""""""""
:Type: integer
:Default: ``2``
:Examples: ``--dec-fnc-crc-ite 1``
|factory::Decoder_turbo_DB::p+crc-start|
.. note:: This parameter requires the Turbo code to be concatenated with a |CRC|
to work, see the :ref:`crc-crc-parameters`.
.. _dec-turbo_db-dec-fnc:
``--dec-fnc``
"""""""""""""
|factory::Flip_and_check::p+|
.. note:: The |FNC| post processing technique is detailed in
:cite:`Tonnellier2016a`.
.. note:: This parameter requires the Turbo code to be concatenated with a |CRC|
to work, see the :ref:`crc-crc-parameters`.
.. _dec-turbo_db-dec-fnc-ite-min:
``--dec-fnc-ite-m``
"""""""""""""""""""
:Type: integer
:Default: ``3``
:Examples: ``--dec-fnc-ite-m 2``
|factory::Flip_and_check::p+ite-m|
See the :ref:`dec-turbo-dec-fnc` parameter.
.. _dec-turbo_db-dec-fnc-ite-max:
``--dec-fnc-ite-M``
"""""""""""""""""""
:Type: integer
:Default: ``10``
:Examples: ``--dec-fnc-ite-M 6``
|factory::Flip_and_check::p+ite-M|
See the :ref:`dec-turbo-dec-fnc` parameter.
.. _dec-turbo_db-dec-fnc-ite-s:
``--dec-fnc-ite-s``
"""""""""""""""""""
:Type: integer
:Default: ``1``
:Examples: ``--dec-fnc-ite-s 2``
|factory::Flip_and_check::p+ite-s|
See the :ref:`dec-turbo-dec-fnc` parameter.
.. _dec-turbo_db-dec-fnc-q:
``--dec-fnc-q``
"""""""""""""""
:Type: integer
:Default: ``10``
:Examples: ``--dec-fnc-q 6``
|factory::Flip_and_check::p+q|
See the :ref:`dec-turbo-dec-fnc` parameter.
.. _dec-turbo_db-dec-ite:
``--dec-ite, -i``
"""""""""""""""""
:Type: integer
:Default: ``6``
:Examples: ``--dec-ite 8``
|factory::Decoder_turbo_DB::p+ite,i|
If the Turbo code is concatenated with a |CRC| and if the |CRC| is checked, the
decoder can stop before making all the iterations.
.. _dec-turbo_db-dec-sf-type:
``--dec-sf-type``
"""""""""""""""""
:Type: text
:Allowed values: ``ADAPTIVE`` ``ARRAY`` ``CST`` ``LTE`` ``LTE_VEC``
:Examples: | ``--dec-sf-type ADAPTIVE``
| ``--dec-sf-type CST 0.5``
|factory::Scaling_factor::p+type|
This is especially useful with the max-log-|MAP| sub-decoders (|BCJR| with the
:math:`\max` approximation): the |SF| helps to recover a part of the decoding
performance loss compare to the |MAP| algorithm (|BCJR| with the :math:`\max^*`
operator).
.. note:: The |SF| technique is detailed in :cite:`Vogt2000`.
Description of the allowed values:
+--------------+---------------------------------------------------------------+
| Value | Description |
+==============+===============================================================+
| ``ADAPTIVE`` | Select the adaptive |SF|, for the first and second iterations |
| | a |SF| of 0.5 is applied, for the other iterations the |SF| |
| | is 0.85. |
+--------------+---------------------------------------------------------------+
| ``ARRAY`` | Select an hard-coded array of |SFs| (c.f. |
| | :numref:`tab_turbo_dec_sf_array`). |
+--------------+---------------------------------------------------------------+
| ``CST`` | Set the same |SF| to be applied for each iterations. |
+--------------+---------------------------------------------------------------+
| ``LTE`` | Select a 0.75 |SF|. |
+--------------+---------------------------------------------------------------+
| ``LTE_VEC`` | Select a 0.75 vectorized |SF| (faster than ``LTE``). |
+--------------+---------------------------------------------------------------+
.. _tab_turbo_db_dec_sf_array:
.. table:: Hard-coded array of |SFs|.
+-----------+--------+
| Iteration | Value |
+===========+========+
| 1 | 0.15 |
+-----------+--------+
| 2 | 0.25 |
+-----------+--------+
| 3 | 0.30 |
+-----------+--------+
| 4 | 0.40 |
+-----------+--------+
| 5 | 0.70 |
+-----------+--------+
| 6 | 0.80 |
+-----------+--------+
| 7 | 0.90 |
+-----------+--------+
| 8 | 0.95 |
+-----------+--------+
.. _dec-turbo_db-dec-sub-max:
``--dec-sub-max``
"""""""""""""""""
Please refer to the |RSC| :ref:`dec-rsc_db-dec-max` parameter.
References
""""""""""
.. bibliography:: references.bib