Improving RSSI based distance estimation for 802.15.4 wireless sensor networks

In this paper an RSSI based distance estimation technique for 802.15.4 network, based on CC2420 radio core, is discussed. In this approach we use standard deviation (SD) of the RSSI value and the packet loss information as a part of model parameters estimation process. The SD and packet loss limits are optimized along with the curve parameters to achieve minimum distance error. The distance estimator uses these optimized limits as a measure of accuracy of the remote node´s estimated distance.