Channel usage

[Tony Langdon]

> I believe there may also be an issue with the chipping codes not being
> orthogonal to each other causing problems with the system 
> gain, I don't know
> details however :(

It's the difference in chipping codes that gives the processing gain,
because the signals are no longer correlated with each other.  If they are
correlated, you lost that benefit and have to space your APs further apart
to get the same performance.

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