Method of compensation between the powers of the received signals for the localization of a Wi-Fi node inLOS/NLOSEnvironments

摘要

This article explores a technique based on the compensation between the powers of the received signals in order to estimate the geographical position of a Wi-Fi node in an external environment.Two cases were considered: the propagation in line-of-sight (LOS) and nonline-of-sight (NLOS). The technique admits five phones with Wi-Fi interfaces, of which four are represented as base stations (BSs) and are equipped with software called Wi-Fi Analyzer. One of the phones is configured in Hot-Spot mode and is regarded as the target. Although these phones are located in 2-D, the antennas used are omnidirectional. The technique succeeds in delimiting the position of the target inside a restricted geographical area.This technique was applied to the multilateration to confirm its precision. The results of simulations show that this technique gives better results than the other conventional methods of localization such as the hyperbolic technique and the traditional (classic) multilateration, using the received signal strength (RSS) to identify the position of the target inside of an area of reduced uncertainty.