On 3/25/22 10:45 AM, jeanmichel.fri...@femto-st.fr wrote:
Thank you all for the very fruitful exchanges and providing the references
I was looking for (by private email).
FYI I indeed tried the brute force search as documented at
https://github.com/oscimp/gr-satre/tree/main/reverse_code
but wanted to try to find some formal documentation demonstrating the
orthogonality
of the codes beyond "trust me, we selected the best codes for maximum
orthogonality".
Also if anyone is interested, I am looking into receiving TWSTFT exchange using
TV
parabola (of course receiving only !). That is for fun since, for work the
modem is
being assembled indeed, but that is off topic :)
Thank you very much, Jean-Michel
--
JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon,
France
There's a good chance that the codes are non maximal length. More likely
they are composite, Gold or Kasami codes, for instance. They give good
cross correlation properties (as well as good autocorrelation) - which
is why GPS uses them.
One can prove the orthogonality in an analytical sense, but these days,
for a short 10,000 bit sequence, brute forcing it is probably as good as
anything. Back in the 80s, a mathematical proof was faster.
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