Localização de usuários usando o sistema celular. / Users localization using cellular system.

AUTOR(ES)

Sergio Forcellini

DATA DE PUBLICAÇÃO

2007

RESUMO

The mobile location technique using the cellular system received a special attention from the telecommunication manufacturers and operators, regarding the need of accomplishing the established demands by the emergency service calls and other commercial ones. This study analyzes the main location methods proposed in the literature, including, in each one, the mathematical formulation involved in the location calculus, the main used algorithms and their limitations. Also, it is analyzed the modeling of the propagation channel based on a cellular environment proposed in COST 259 report. After this analysis we can find a correlation between the signal mean delay and its delay spread, which motivated the use of a new algorithm for location estimative. A new algorithm, especially efficient for the cases where one or more base stations dont have Line-of-Sight (NLoS) with mobile station, is presented and several simulation results are analyzed and compared with other algorithms widely accepted and recognized. In order to improve the final position estimation, the Kalman filtering is also applied to the new proposed algorithm.

ASSUNTO(S)

mobile station estação base estação móvel base station channel model modelo de canal location telefonia celular cellular system

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