Browsing by Author "Kefyalew, Dawit"

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    Investigation of Mobile Station Position Location Technique for Cellular System
    (Addis Ababa University, 2009-08) Kefyalew, Dawit; Abdo, Mohammed (PhD)
    Wireless position location (PL) is a relatively recent technology in the field of wireless communication. The US federal communication commission FCC recommendation is the driving force for PL research since it requires that the wireless service provider include PL service for emergency calls. It is believed the majority of emergency calls come from mobile subscribers. In order to locate these subscribers by public safety answering point (PSAP) a lot of research is going on. Wireless PL is also an attractive business for service provider in the field of advertising, navigation, effective workforce management, information broadcast and other value added services for users. In this thesis an investigation of different PL technique is made. The advantages and disadvantages of the PL techniques are surveyed. Based on the investigation an optimum PL technique proposed. On investigation it is found that most PL techniques need three or more base stations (BS). There should be synchronization among them; which increases the signaling load of the network. Moreover these techniques assume a line of sight signal which is not valid specifically for urban environment. In order to solve this problem, this work focuses on PL technique using single BS using smart antenna. i In an urban environment where line of sight assumption is not valid Fingerprint Matching Technique is an optimum solution. Implementation of this technique across a test route near Tikur Anbessa Hospital shows 67% of location error is less than 72m. For suburban and rural environment with the assumption that at least one line of sight signal is available, a hybrid TOA/AOA technique using smart antenna is found to be an optimum solution for this environment. The simulation result shows that location error below 66m for 67% cab be attained