On Thu, 23 Jun 2016 14:55:05 -0400, Michael Richardson wrote:
Bill Moffitt <bmoff...@ayrstone.com> wrote:
> I love the idea of meshing WiFi systems adapting their channel
settings
> around local interference... so the Plume in my house detects
that my
> next door neighbor's Portal is interfering, so it changes its
> channel. However, the Plume in my garage is much closer to the
neighbor
> behind me than the Plume in my house, and changes the channel
to avoid
> them. This then interferes with the neighbor's Portal, which
changes
> its channel to avoid my interference, which then interferes
with the
> neighbor behind me, who changes channel to avoid that
interference...
This is the map colouring problem as you point out:
> P.S. for the mathematically inclined, note the discrepancy
between the
> 3 distinct channels in the 2.4 GHz. band and the application of
the
> 4-color theorem to channel selection. Sucks...
Am I wrong in thinking that if you can lower your Tx power that you
can bleed
less into adjacent channels?
well, lowering TX power reduce your impact on everything, including
adjacent channels, but not enough.
things can be done with good antenna design, but you would need to do
the same thing on both ends, and you still have a problem that your
transmitter and receiver are so close to each other that it's really
hard to isolate them.
unfocused power drops off at the cube of the distance, so things a few
feet apart have a tremendous advantage to the same things within a
couple inches of each other (completely ignoring signals propagating
over power/ground busses and things like that)
David Lang
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