Signal demodulation and diversity combining in a...

H - Electricity – 04 – L

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H04L 27/00 (2006.01) H04B 1/707 (2006.01) H04B 7/02 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2195176

For combining diversity path signals comprising symbols each modulated in accordance with one of a plurality of orthogonal (e.g. Walsh) functions, a diversity combiner includes, for each path, a demodulator to demodulate each modulated signal symbol in accordance with a selected one of the orthogonal functions, a phase estimator to estimate a phase rotation and amplitude of the diversity path signal from the demodulated signal, and a complex signal multiplier to derotate the phase and weight the amplitude of the diversity path modulated signal in dependence upon the estimated phase rotation and amplitude. The combiner sums real parts of the phase-derotated and weighted modulated signals of the diversity paths, demodulates the combined signal in accordance with all of the orthogonal functions, and selects the maximum demodulated signal for each symbol thereby to determine for the symbol the selected one of the orthogonal functions.

our la combinaison de signaux sur trajet en diversité comprenant des symboles modulés chacun selon l'une parmi un certain nombre de fonctions orthogonales (p. ex. Walsh), un combinateur de diversité comprend, pour chaque trajet, un démodulateur qui démodule chaque symbole de signal modulé selon une fonction orthogonale sélectionnée, un estimateur de phase qui évalue la rotation de phase et l'amplitude du signal sur trajet en diversité, à partir du signal démodulé, et un multiplicateur de signaux complexes qui élimine la rotation de phase et pondère l'amplitude du signal modulé sur trajet en diversité, selon la rotation de phase et l'amplitude estimées. Le combinateur effectue la sommation des parties réelles des signaux modulés à élimination de la rotation de phase et à pondération sur les trajets en diversité, démodule le signal combiné selon l'ensemble des fonctions orthogonales et sélectionne le signal démodulé maximal pour chaque symbole afin de déterminer ainsi la fonction orthogonale sélectionnée pour le symbole.

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