MAXIMUM LIKELIHOOD ESTIMATION OF THE DIRECTION-OF-ARRIVAL OF PSK MODULATED CARRIERS / ESTIMAÇÃO DE MÁXIMA VEROSSIMILHANÇA DA DIREÇÃO DE CHEGADA DE PORTADORAS PSK

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

In mobile communication systems, phase shift keying (PSK) modulation is widely used in digital transmission schemes. Previous works have considered several maximum likelihood (ML) methods for the direction-of-arrival (DOA) estimation of generic signals reaching a phased-array of sensors. This thesis proposes a new ML DOA estimator designed to be used in PSK communication systems. Two transmission models are considered for parameter estimation: a simpler one, considering all carrier clocks time-aligned with the receiver clock, and another that considers this misalignment as a delay for each carrier. The number of parameters to be jointly estimated is significantly reduced when the expected value of the antenna array measured signals with respect to the modulation phases is evaluated. The estimator performance in several simulation scenarios is presented and compared to the performance of a classic ML estimator designed for all sorts of signal models. Cramér-Rao bounds for single carrier scenarios are also evaluated. The proposed method robustly outperforms the classic ML estimator in all simulations.

ASSUNTO(S)

direction-of-arrival estimation estimacao de direcao de chegada digital transmission estimacao de maxima verossimilhanca transmissao digital maximum likelihood estimation

ACESSO AO ARTIGO

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