COMPARISON OF POSITIONING ACCURACY OF GRID AND PATH LOSS-BASED MOBILE POSITIONING METHODS USING RECEIVED SIGNAL STRENGTHS

摘要

In this paper, positioning accuracy of two basic mobile positioning methods based on Received Signal Strength (RSS) measurements is compared via comprehensive simulations. The first method is a path loss-based technique using general free-space loss model and brute-force algorithm. The second method is a grid (fingerprint)-based positioning approach, with averaging over several nearest neighbor grid points. In the analysis, these two methods are compared in various outdoor scenarios using Matlab simulations. It is shown that the grid-based method performs better when fast fading is present and/or shadowing variance is 10 dB or more, even if path loss parameters are perfectly estimated. In addition, for the grid-based method, the optimal choice of the number of neighbor points for averaging is shown.