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[aprssig] "Best" packet decoder solution

Jason KG4WSV kg4wsv at gmail.com
Tue Dec 28 16:27:09 UTC 2010


On Tue, Dec 28, 2010 at 8:40 AM, Wes Johnston <wes at ai4px.com> wrote:
> Hmm.... dopplegänger packets anyone?  Two IDENTICAL packets back to back.
>  At first blush you get the benefit of a 2nd shot at decoding a packet.

With "hard" decoding, double packets is a waste of time/bandwidth if
there's an error in either one. With the confidence level decoding,
maybe there would be some benefit.

> It's *really* a shame that AX25 doesn't support FEC at level 2.

Google FX.25.  This was proposed for (and maybe flown on) on a
cubesat. IIRC, they wrapped an AX.25 with some FEC information, so
that the packet could be decoded using standard AX.25 hardware, but
FEC-enabled hardware could attempt error correction.

-Jason
kg4wsv



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