Method for reference signal generation in the presence of...

H - Electricity – 04 – B

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H04B 7/08 (2006.01) H04L 1/06 (2006.01)

Patent

CA 2343900

A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including: separating from the signals received at the antenna elements a copy signal corresponding to the signal transmitted by a particular remote station using an initial spatial weight vector corresponding to the particular remote station; determining from the terminal copy signal a reference signal having substantially the same frequency offset and time alignment as the received antenna signals; and computing a new spatial weight vector by optimizing a cost function, the cost function using the received antenna signals and the reference signal. For demodulation, the method further includes extracting the symbols of the modulated signal.

Ce procédé de génération d'un signal de référence à partir d'un signal modulé transmis à une station de communications, pourvue d'un réseau d'antennes et de dispositifs de traitement spatial, consiste à séparer des signaux reçus par les antennes un signal de copie correspondant au signal transmis par un terminal distant particulier et ce, au moyen d'un vecteur initial de pondération spatiale correspondant au terminal distant particulier, puis à déterminer, à partir du signal de copie du terminal, un signal de référence dont le décalage de fréquence et l'alignement temporel sont quasiment identiques à ceux des signaux d'antenne reçus et à calculer un nouveau vecteur de pondération spatiale par optimisation d'une fonction de coût, cette fonction utilisant les signaux d'antenne reçus et le signal de référence. Pour effectuer la démodulation, on extrait, dans le cadre de ce procédé, les symboles du signal modulé.

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