Re: [Madwifi-devel] RSSI mesurements

[Jim T. <ji...@ne...>]

Andr=E9 Iasi Moura wrote:

>I'm developing a system that analyses RSSIs from diferents access points=
 in a building to infer the location of a device and I would like to know=
 how the information about RSSI is generated when I request a network sca=
n. Is it only a hardware's job, or the driver has some influence on it?
>=20
>I have a Athreos AR5002 card on my lap-top and I made some tests on a Wi=
ndows platform. When I walk around with my machine, the system takes seve=
ral seconds to show any change on the reported RSSI. Is it likely to be d=
iferent on a Linux working with MadWifi? Do any body know if there is oth=
er cards that can give a more accurate response?=20
>=20
>
RSSI is a chipset specific measure of 'received signal strength'.  You
can't compare RSSI values from chipset 'A' against  chipset 'B'.

On the Atheros cards (and most other cards of which I am aware) each
received packet can have an associated RSSI value.

jim