ABSTRACT
Ray-tracing is a good alternative to find the position of a mobile terminal because it takes into account the multiple rays coming from different directions. Ray-tracing analysis is used for several localization methods in order to obtain information about propagation in for indoor environments. The use of a ray-tracing analysis presented herein enables site-specific location using only a single base station. Highly accurate ray-tracing analyses using three-dimensional terrain data have been carried out. The main problem associated with ray-tracing approaches is that they need a great amount of time to obtain the multipath propagation. The location fingerprints are obtained by analyzing the relative ray-tracing delay and signal strength from multiple access points over a defined grid. The chapter presents an approach using the multipath behavior by combining ray-tracing measurements and a fingerprinting technique to determine the location of a mobile station.
