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 Cheers Mathieu Van der Haegen Machine Learning Group <http://www.ulb.ac.be/di/mlg/>, Brussels, Belgium
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