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List:       gnuradio-discuss
Subject:    RE: LDPC Decoder block API change
From:       Dave Miller <dave.todd.miller () gmail ! com>
Date:       2023-07-26 1:58:50
Message-ID: CAH46-NJiEfEsJFR3Bf3=q=TVZrZG3h8DpZCZ8Fv3qi+Uj1ky1Q () mail ! gmail ! com
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Jeff,

I have implemented a GNU Radio OOT block for a CCSDS rate 1/2 LDPC Decoder.
I did not even try to use the current GNU Radio In-Tree LDPC decoder block
because others have noted that the In-Tree LDPC decoder has issues:

  1. I used the MIT AFF3CT C++ library as noted on my OOT site for the
decoder on github: gr-aff3ct_codes
             - An AFF3CT library approach for a LDPC decoder was also noted
by Daniel Estevez (gr-satellites) in his Orion/Moon Link analyses/articles
in late CY2022.
  2. The AFF3CT C++ library may open up many other decoder options also for
GNU Radio decoders.
  3. However, I did use the GNU Radio In-Tree LDPC Encoder Block for my
CCSDS Rate 1/2 LDPC Encoder.

Regards,
Dave Miller
----------------------------------------------------------------------------------------------------
------------------------------
*From*: Jeff Long
*Subject*: LDPC Decoder block API change
*Date*: Tue, 25 Jul 2023 18:32:26 -0400
------------------------------
Does anyone use the LDPC Decoder block? PR
https://github.com/gnuradio/gnuradio/pull/6748 will remove a param,
changing the API. Normally we wouldn't do this, but best we can tell, the
block is currently broken and unused.

[Attachment #3 (text/html)]

<div dir="ltr"><div>Jeff,</div><div><br></div><div>I have implemented a GNU Radio OOT \
block for a CCSDS rate 1/2 LDPC Decoder. I did not even try to use the current GNU \
Radio In-Tree LDPC decoder block because others have noted that the In-Tree LDPC \
decoder has issues:</div><div><br></div><div>   1. I used the MIT AFF3CT C++ library \
as noted on my OOT site for the decoder on github: gr-aff3ct_codes</div><div>         \
- An AFF3CT library approach for a LDPC decoder was also noted by Daniel Estevez \
(gr-satellites) in his Orion/Moon Link analyses/articles in late \
CY2022.</div><div></div><div>   2. The AFF3CT C++ library may open up many other \
decoder options also for GNU Radio decoders.</div><div>   3. However, I did use the \
GNU Radio In-Tree LDPC Encoder Block for my CCSDS Rate 1/2 LDPC \
Encoder.<br></div><br><div>Regards,</div><div>Dave \
Miller<br></div><div><h2>----------------------------------------------------------------------------------------------------</h2><div></div><h2></h2>
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<b>From</b>: </td>
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Jeff Long</td>
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<b>Subject</b>: </td>
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LDPC Decoder block API change</td>
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<b>Date</b>: </td>
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Tue, 25 <span class="" style="" id=":2e7.2" tabindex="-1" role="menuitem" \
aria-haspopup="true">Jul</span> 2023 18:32:26 -0400</td> </tr>

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<div dir="ltr">Does anyone use the LDPC Decoder block? PR <a rel="nofollow" \
href="https://github.com/gnuradio/gnuradio/pull/6748">https://github.com/gnuradio/gnuradio/pull/6748</a>
  will remove a param, changing the API. Normally we wouldn&#39;t do this, 
but best we can tell, the block is currently broken and unused.</div></div></div>



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