Hi,
With the discussion on the 2100 bps candidate (and even lower) and remarks on "testing it on-air" and "porting it to fix-point"; one of the other discussion in this is related to what FEC to use. I'm now working on porting the low-level software of G4KLX's pcrepeater software to the friendlyarm mini2440, using just a USB audio-dongle (now have "alpha" code for the D-STAR receiver running). Next step would be to port this to a more powerfull board (like the pandaboard I also have) and try to play around with a DV-variant using codec2). However, we do need a FEC protocol for that. Are there FEC-protocols out there that are know not to be patended? While writing the code for D-STAR, I've seen that a 1/2 FEC is used on the header; a system that is apparently well documented (althou I do not know its status). If a 2.1 Kbps codec2 vocoder would work OK, the 4.8 Kbps of a VHF or UHF DV-channel (using the same modulation parameters are D-STAR), would allow for a 2/1 FEC on a 2.1 Kbps DV communication, and even have some plave left for some other data (like syncronisation sequences). 73 Kristoff - ON1ARF ------------------------------------------------------------------------------ RSA® Conference 2012 Save $700 by Nov 18 Register now! http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
