RFUtils - Paul Tobey

  • Thread starter Thread starter Mikkel Andreasen
  • Start date Start date
M

Mikkel Andreasen

Hi Paul

I'm using your RFUtils with great success, but I was wondering if it is
possible to extend it. What I'd like to see added is the possibility to get
Noise and SNR.

Regards

Mikkel Andreasen
 
I don't see any way of getting a SNR or noise parameter from an 802.11
adapter (and I don't know what they'd mean in that context, anyway).

Paul T.
 
No... I havent found a way either.

But I've seen it on the netstumpler software for PC.

Here you get both SNR (which is pretty easy if you have noise and
signalstrength) and NOISE.

But thanks anyway.... If I find the way, can I then contact you?

Mikkel
 
Post here, if you find an API that returns that information. Remember that
the network stack on the PC and that on Windows CE is significantly
different. What does SNR mean in that context anyway? Why is it useful?

Paul T.
 
Hi Paul,

To obtain SNR, one would need some sort of analog measurement of the noise
floor. This would have to be provided by the hardware. Personally, I
haven't seen any such thing. I'd have guessed that it would require custom
hw, not something "off-the-shelf."

Dick

--
Richard Grier (Microsoft Visual Basic MVP)

See www.hardandsoftware.net for contact information.

Author of Visual Basic Programmer's Guide to Serial Communications, 3rd
Edition ISBN 1-890422-27-4 (391 pages) published February 2002.
 
Yes, I know. What I can't figure out is what that would be good for, even
if you had it in every card. Interesting, maybe, if you are the antenna
designer, but useful for a customer?

Paul T.
 
Hi Paul

The reason Noise is important to us, is that we are trying to use RFUtils
for indoor positioning through wireless infratrstructure, a student project.
The main problem is that Noise has an impact on the signal strenght recieved
from an access point. Therefore if we had the Noise level, we could estimate
the accuracy of the recieved signal strenght, and determine the users
location better. So far we got a pretty accurate positioning system, but
this requires between 4-6 access points visible at all time from the
RF-adapter. We would like it to be possible only with 3 access points, since
this would require less installation.

Regards
Anders Fredborg
 
I think this must be possible to get this values.

pocketwarrior does it. and the source (C++) is freely available (GPL)

perhaps someone can have a look on the SRC who really understands something
from C++.

Source of Pocketwarrior is here
http://sourceforge.net/projects/pocketwarrior/

or contact me i send u what i've downloaded..

regards

Milosz
 
I don't think I can help you with that. I don't see any means to ask the
card for noise information.

Paul T.
 
OK, but correct me if I'm wrong: any derivative work using that source code
must also be licensed under the GPL. If that's the case, I don't think I
want to read it...

Paul T.
 
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