Performance Analysis of RSS-Based Localization in Wireless Sensor Networks

摘要

In this paper, localization error of the received signal strength (RSS)-based method in mixed LOS/NLOS conditions is analysed. In contrast to the time of arrival, time-difference of arrival and angle of arrival, RSS measurements are low-cost and ubiquitous in the indoor environment. The localization inaccuracy for the RSS-based method is first computed in the presence of NLOS positive bias using perturbation analysis. Subsequently, root-mean-square localization error is determined using Cramer-Rao lower bound analysis under the range error. Experimental results for mobile phone localization in two different indoor environments are shown to attain theoretical bound asymptotically.