Time range Brownian movement 1 Diffusing particles 1 Diffusion 1 Encounter time 1 Errors 1 Fusion methods 1 IEEE Standards 1 Improved matching positioning 1 Indoor positioning 1 Indoor positioning systems 1 Intelligent systems 1 Matchings 1 Monte Carlo methods 1 Monte Carlo's simulation 1 Performance 1 Probability densities 1 Range measurements 1 Real- time 1 Reflecting boundary 1 Single-point positioning 1 Survival probabilities 1 Three-dimensional domain 1 Two-dimensional 1 Two-particle systems 1 Wi-Fi 1 Wi-Fi FTM 1 Wi-fi fine time measurement 1 Wireless local area networks (WLAN) 1 fusion 1