A modified fingerprinting technique for an indoor, range-free, localization system with dynamic radio map annealing over time

This paper focuses on improving the fingerprinting techniques required for an indoor, range-free, Wireless Local Area Network (WLAN) localization system. An important application of such a system is for the accurate localization of equipment and persons within a dense hospital environment. Due to the time consuming nature of fingerprinting, which is also considered to be too invasive on the normal operations within an environment, an investigation was conducted into the two components of fingerprinting that can be adjusted in order to alleviate the problem: a reduction in the time spent collecting fingerprint Received Signal Strength (RSS) measurements at each calibration point and a reduction in the density of fingerprinted calibration points throughout the environment.