On Tue, Nov 1, 2011 at 5:42 PM, Kristoff Bonne <krist...@skypro.be> wrote: > Running on D-STAR is -as far as I see it- not possible; for two reason: > - Using codec2 in the "DV" (digital voice) mode is incompatible with the > D-STAR specification. These explicitally say "D-STAR uses AMBE".
Thats nice. If anyone gives anyone any trouble about that, it's a rather easy argument that using D-STAR DV on amateur radio bands is unlawful, at least in the US. If someone thinks they think they can _mandate_ a secret and proprietary encoding scheme only available as a potted black box— isomorphic to encryption— on amateur radio... well, I'd be amused to see them try, and if they succeed I look forward selling one off custom opaque codecs to anyone who wants to run a private repeater without prying ears and lids butting in. > So, what FEC protocol do you propose? Are there 1/2 FEC protocols out > there that are not patented? There are a zillion and one. Forward error correction is not exactly a new science. Pretty much everything _except_ the recent France Telecom/turbocode stuff is fine. Whats best depends on your channel conditions, modem output (e.g. can you do soft decision), and your computational budget. Personally I'd use a great big LDPC code, but I'm not interested in low computational complexity at all. A demodulation that needed all 6 cores of a modern 3GHz cpu would be fine by me, so long as it was all put to use improving ebn0 :) ------------------------------------------------------------------------------ RSA® Conference 2012 Save $700 by Nov 18 Register now! http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
