RE: LDPC Decoder block API change

All,

Since last week below (CCSDS LDPC Rate 1/2 OOT Decoder), I have just also added a DVB-S2 Rate 1/2 LDPC decoder and associated Encoder/Decoder flowgraph to my gr-aff3ct_codes repository:

1. For the DVB-S2 Rate 1/2 LDPC Decoder (64800,32400), I again used the AFF3CT C++ Library

2. For the DVB-S2 Encoder, I used the GNU Radio In-Tree DVB-S2 LDPC Encoder block

https://github.com/DavidToddMiller/gr-aff3ct_codes

Regards,

Dave

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From:	Dave Miller
Subject:	RE: LDPC Decoder block API change
Date:	Tue, 25 Jul 2023 21:58:50 -0400

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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

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From:	Jeff Long
Subject:	LDPC Decoder block API change
Date:	Tue, 25 Jul 2023 18:32:26 -0400

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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.