Investigation of Mobile Station Position Location Technique for Cellular System
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Date
2009-08
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Addis Ababa University
Abstract
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
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Keywords
Cellular System