TY - CONF AB - In this paper, we experimentally evaluate algorithms for velocity estimation of a GSM 900 mobile terminal which are based on the analysis of the statistical properties of the fast fading process. It is shown how theses statistics can be obtained from the training sequences present in downlink transmission bursts without establishing an active connection. Realistic simulations of a GSM channel according to the COST 207 channel models have been conducted. These models incorporate effects like multipath propagation, fading, cochannel interference and additive noise. It is shown that velocity estimation by searching for the maximum slope of the power density spectrum of the fast fading performs best. AU - Peschke, Sven AU - Haeb-Umbach, Reinhold ID - 11883 KW - additive noise KW - cellular radio KW - channel estimation KW - cochannel interference KW - COST 207 channel models KW - downlink transmission bursts KW - fading channels KW - fading process KW - GSM downlink signalling KW - mobile terminals KW - multipath channels KW - multipath propagation KW - power density spectrum KW - statistical analysis KW - statistical properties KW - telecommunication links KW - telecommunication terminals KW - velocity estimation T2 - 4th Workshop on Positioning Navigation and Communication (WPNC 2007) TI - Velocity Estimation of Mobile Terminals by Exploiting GSM Downlink Signalling ER - TY - CONF AB - Current navigation systems like GPS (Global Positioning System) and its Russian counterpart GLONASS (Global Navigation Satellite System) only evaluate the direct signal path. The receivers treat the reflected paths also reaching the receiver antenna as disturbance which has to be suppressed. Multipath affects the tracking accuracy by resulting in a degeneration of the S-curve of the DLL (delay locked loop). Nowadays the future European systems GALILEO and GPSIIF/III with two new signals are on the way to the market and it is time to think about new receiver structures. Therefore we investigated if it is possible to use multipath for navigation constructively. AU - Bischoff, Renke AU - Haeb-Umbach, Reinhold AU - Schulz, Wolfgang AU - Heinrichs, Guenther ID - 11733 KW - combined GALILEO/UMTS receiver KW - delay locked loop KW - delay lock loops KW - DLL KW - Global Positioning System KW - GLONASS KW - GPS KW - GPSIIF/III KW - mobile satellite communication KW - multipath channels KW - multipath receiver structure KW - radio receivers KW - RAKE receiver KW - S-curve T2 - IEEE 55th Vehicular Technology Conference (VTC 2002 Spring) TI - Employment of a multipath receiver structure in a combined GALILEO/UMTS receiver VL - 4 ER -