Dynamic creation of WiFi-signal level maps for location systems

Signal level maps are designed to locate wireless mobile devices. To increase a wireless network segment, it is necessary to create new signal level maps for implementation of location of wireless mobile devices in new areas. Traditionally, such maps are based on a great number of measurements taken at certain points, the process of these measurements requires a lot of time. In the article, dynamic creation of signal level maps is investigated. A heuristic algorithm for dynamic creation of signal level maps during operation of a location system is described. A function similar to the likelihood function was used for estimation of the average values of the signal levels. WiFi networks operating in the 2.4-gigahertz frequency band were used as wireless networks. Test results show that the suggested algorithm can be used for solving this issue.