Adaptive equalizer for digital cellular radio

H - Electricity – 04 – B

Patent

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Details

H04B 7/005 (2006.01) H04L 25/03 (2006.01) H04L 27/01 (2006.01) H04L 27/18 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2061851

The present invention provides a method of estimating parameters of a mobile radio channel which are used for providing the equalization and synchronization of the radio channel. The channel is modelled as a discrete number of independent Rayleigh-faded propagation paths. First, the relative delay of each path is estimated, using maximum likelihood methods. Using this information, the associated time-varying path weights are then determined using a least-squares fit. This is sufficient information to estimate the impulse response of the channel. The actual equalizer weights are then obtained by inverting the estimated channel impulse response.

Méthode permettant d'estimer les paramètres d'un canal de radio mobile qui servent à assurer l'égalisation et la synchronisation de ce canal. Celui-ci est modélisé en un nombre discret de trajets de propagation indépendants à évanouissement à distribution de Rayleigh. Premièrement, le retard relatif de chaque trajet est estimé à l'aide de méthodes de maximum de vraisemblance. Au moyen de cette information, les poids associés des trajets variables dans le temps sont ensuite déterminés à l'aide d'un ajustement par les moindres carrés. Cette information suffit pour estimer la réponse impulsionnelle du canal. Puis les poids réels de l'égalisateur sont obtenus par inversion de la réponse impulsionnelle du canal estimée.

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