[Server-devel] [OLPC Networking] RSSI value questions

Oliver Mattos oliver at mattos.co.uk
Wed Apr 2 13:17:23 EDT 2008

To be honest I very much doubt the hardware in the wireless adaptors could
measure time in single digit nanoseconds, and even if they could it would
probably require a change in the over the air signal to use more bandwidth
(spectrum) for a "pulse" to get better time resolution, which in turn would
require hardware modification.

I would think the sound and signal strength meter are better metrics.
Remember although signal strength is a bad indicator by itself, it can be
much improved with 2 aerials and the large number of possible pairs to
measure signal strength between in a well linked mesh.

On Wed, Apr 2, 2008 at 3:14 PM, Martin Langhoff <martin.langhoff at gmail.com>

> On Wed, Apr 2, 2008 at 4:27 AM,  <david at lang.hm> wrote:
> >  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
> The recommended configuration for mid-to-high-end school servers has 3
> active antennaes attached, and our recommendation is that they are
> placed well apart. They can be up to 10m apart due to USB cable lenght
> limits, and Wad mentioned 2m minimum recommended distance. If the
> distance is enough (in relation to the granularity of timers in the
> antennaes) then telling the XS about relative location of the
> antennaes could provide enough info.
> Having said that, I suspect that being able to do any of the above is
> somewhat far ahead in time ;-)
> cheers,
> m
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- School Server Architect
>  - ask interesting questions
>  - don't get distracted with shiny stuff - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff
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