Projecte final de carrera fet en col.laboració amb Technische Universiteit Eindhoven

UMTS network, also known as Third Generation (3G) mobile radio system, aims to provide services such as: mobile communication, data streaming, internet and driving guidance. The UMTS signal uses the frequency channel of 2GHz. This channel introduces some propagation difficulties like multipath effect, Doppler shifts and fading. UMTS improves the well known hard-handover process from 2G networks into the soft-handover. During the soft-handover, the mobile station is connected to different transmitters at the same time. The bad frequency synchronization of these transmitters creates the same propagation difficulties. These bad effects aforementioned can affect the quality of the communication between the Base Station and the mobile device. The thesis presents the study of propagation effects on the received frequency and compares the results with the synchronization requirements of the transmitters. BER simulations where done to study the reception quality in high-speed conditions. Furthermore, we introduce a method to reduce the impact of fast-device movement that can be used in the softhandover procedure to reduce the effect of bad synchronization.