Apparatus for code tracking in a direct sequence spread...

H - Electricity – 04 – B

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H04B 1/707 (2006.01) H04L 27/18 (2006.01)

Patent

CA 2250074

Inphase and quadrature signals are applied to first, second and third correlators, the first correlator being arranged to generate prompt signals, the second correlator being arranged to generate late signals and the third correlator being arranged to generate early signals. The output from the first correlator is passed to estimation means and signals generated from the estimation means are multiplied with the outputs from the first and second correlators in respect of each channel. The inphase and quadrature channel signals generated from the second and third correlators are added together and the sum of signals are then subtracted to generate a signal for controlling a loop filter and clock generation means controls the analogue to digital converters.

Des signaux en phase et en quadrature sont appliqués à un premier, un second et un troisième corrélateur, le premier étant configuré pour générer des signaux d'invite, le second pour générer des signaux tardifs et le troisième pour générer des signaux précoces. La sortie du premier corrélateur est transmise à un système d'estimation, et les signaux générés par ce dernier sont multipliés par les signaux de sortie venant du premier et du second corrélateur par rapport à chaque canal. Les signaux de canaux en phase et en quadrature générés par le second et le troisième corrélateur sont additionnés, puis la somme des signaux est soustraite de façon à générer un signal permettant de commander un filtre à boucle. Un système de génération de signal d'horloge commande les convertisseurs analogique/numérique.

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