Location Based Services are becoming more and more important with the spread of Next Generation Wireless and Multimedia Networks. In order to ensure the information access anytime and anywhere, we have to know exactly the location of mobile users.
Over the years, many problems have been solved regarding the determination of the outdoor location of mobile users. Among the outdoor location determination techniques the most popular and widely used is the GPS (Global Positioning System).
The determination of indoor localization is a relatively new research area and, although several systems have already been developed, further improvements are needed to de-termine more precisely mobile users’ indoor location. Owing to the special character of the indoor environment, an accurate modeling of signal propagation is an important factor, since the constantly changing circumstances may deteriorate significantly the effectiveness of the localization.
The goal of my thesis it to develop a new signal propagation model working with a 433 MHz frequency indoor location determination system. Furthermore, I analyze the creat-ed signal propagation model with simulation and I evaluate the simulation results. In addition, I give a review of the main existing indoor location systems and signal propa-gation models as well as the factors which influence signal propagation.