[Tinyos-help] relationship between RSSI and distance

[Philip Levis]

On Jul 6, 2007, at 4:09 AM, Van der Haegen Mathieu wrote:

> I'd like to add that RSSI doesn't seem really correlated with  
> distance in the experiments we did with our sensors nodes in an  
> inside environnement with distances going from 1 to 10 meters.
>
> Lqi seem to be more correlated with distance in the same experiment
>
> I can send you our paper about this if you are interested
>

This seems strange, unless you were in a very short distance range;  
the CC2420's LQI is the soft chip decision coefficients, and so is  
directly a result of the SNR (and therefore the RSSI). Your assertion  
would only make sense if your links were all in the grey region of  
intermediate link quality, in which LQI varies.

Phil