The FT8/FT4 communication protocols use an 83x91 generator matrix for the low-density parity check code. I am interested in MATLAB recasting of portions of these protocols. Can anyone explain to me where the numbers in the generator matrix come from?

  • $\begingroup$ Hi Gerald, and welcome to ham.stackexchange.com! $\endgroup$ – rclocher3 Aug 25 at 21:55
  • $\begingroup$ Hi! I've never looked in detail into the FEC in FT8. I don't even precisely know where to look for documentation. Is there some design document by the original inventor? $\endgroup$ – Marcus Müller Aug 26 at 7:53
  • $\begingroup$ The July/August 2020 issue of ARRL QEX had an article (starting page 7) containing a full description of the FT8 design, with K9AN and K1JT listed as authors. See my answer here: ham.stackexchange.com/questions/9962/… $\endgroup$ – hotpaw2 Aug 26 at 16:51
  • $\begingroup$ @hotpaw2 thanks! Helps a lot. $\endgroup$ – Marcus Müller Aug 26 at 17:30
  • $\begingroup$ Gerald, before I draft an answer: How much do you understand about block codes? Where should I start? $\endgroup$ – Marcus Müller Aug 27 at 12:19

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