piclist 2002\09\30\085443a >
Thread: PICs and RF links
www.piclist.com/techref/microchip/ios.htm?key=rf
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face BY : Russell McMahon email (remove spam text)



> But what's a good way to go in order to be
> able to sync and resync quickly?

If you want optimum synchronisation (and a scheme that will stun your
friends if they haven't met it) look at "T Codes" invented by Mark Titchener
of Auckland University.

T codes essentially implement a recursive binary tree where each new node
added replicates the preceding tree to date. Using them is easier than
understanding them (fortunately).

Despite their apparently scary nature T Codes are essentially simple to
implement and allow mind boggling resynchronisation capabilities (to my mind
anyway).

Here's a page with some material thereon including a PhD thesis. There will
be simpler material around I'm sure. I have a friend who did his PhD on T
codes who I am sure could point you to some simpler material if you can't
Google up anything.

       http://www.tcs.auckland.ac.nz/~ulrich/publications.html

Here's a not totally simple intro

       http://www.tcs.auckland.ac.nz/~ulrich/depletion.ps

or a slightly mangled text version of the same thing.


http://www.google.co.nz/search?q=cache:aKbRonKMMPYC:http://www.tcs.auckland.ac.nz/~
ulrich/depletion.ps+%22introduction+to+t+codes%22&hl=en&ie=UTF-8

Here's an abstract that demonstrates that T codes may well be what you want
BUT they ant money for the full article.

           http://www.jucs.org/jucs_2_11/data_compression_and_serial



       Russell McMahon

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