Sobre modelos e métodos de estimação de direção de chegada de sinais em sistemas digitais de comunicação sem fio / On models and methods for direction of arrival estimation of signals in digital wireless communication systems

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

26/08/2011

RESUMO

This thesis deals with the problem of estimating the direction of arrival of digitally modulated signals, specifically found in the uplink of multiuser wireless communication systems where the base station uses an antenna array. The main objectives of the thesis are: to clarify some details normally not treated in the description of the data models assumed in the existing literature, specially, on link and receiver conditions that are necessary to validate the employed models; to present some of the most relevant estimation methods to the current context and to evaluate their advantages and disadvantages; and to introduce the estimation method developed in the researches during the doctoral period, which represents the greater contribution of the thesis in terms of metodology. The proposed solution is fundamented in the maximum likelihood criterion and the performance analysis done through numerical simulations show that the estimator yields results with a quality close to that defined by the Cramér-Rao bound. Some important characteristics of the method are: i) capacity to operate with any number of sources if the number of antennas is greater than or equal to two and the number of snapshots is sufficiently greater than the cardinality of the signal space; ii) the estimation quality does not depend on the angle separation between sources; and iii) possibility to operate with uncalibrated arrays

ASSUNTO(S)

processamento de sinais sistemas de comunicação sem fio teoria da estimação modulação digital signal processing wireless communication systems estimation theory digital modulation

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