Date Added: May 2010
WLAN RSS-based localization has been a hot research topic for the last years. To obtain high accuracy in the noisy wireless channel, WLAN location determination systems usually use a calibration phase, where a radio map, capturing the signal strength signatures at different locations in the area of interest, is built. The radio map construction process takes a lot of time and effort, reducing the value of WLAN localization systems. In this paper, the authors propose 3D ray tracing as a way for automatically generating a highly accurate radiomap. They compare this method to previously used propagation modeling-based methods like the Wall Attenuation Factor and 2D ray tracing models. They evaluate the performance of each method and its computational cost in a typical residential environment.