[OLPC Networking] RSSI value questions

[david at lang.hm]

On Wed, 2 Apr 2008, Polychronis Ypodimatopoulos wrote:

> Ryan,
>
> Like Ben said, inducing the physical layout of the network from metrics
> such as RSSI will give you poor results for various reasons. What
> "Space" did was to average arrival rates from direct neighbors over a
> "long" period of time (anywhere between 1 and 10 seconds) to avoid
> highly temporal effects like multipath and noise. Even so, the result is
> only a rough layout of the network. If you'd like to achieve better
> accuracy I thing you should combine other ideas like sound measurements,
> as Ben suggested.

trying to work from signal strength won't work well, but you may be able 
to triangulate based on the arrival time of the signal at various 
locations.

there are companies that do this commercialy with 3+ access points

David Lang