Hybrid space-time diversity beam forming method

H - Electricity – 04 – W

Patent

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H04W 56/00 (2009.01) H01Q 21/06 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2506511

A method of beam forming is provided for an appliqué intelligent antenna system. The appliqué system uses a watchdog function to monitor broadcast channels of an existing mobile wireless base station to which it is attached. The appliqué system synchronizes itself in frequency and time to the base station. In GSM timing delays are used to prevent collision of timeslots from various mobile terminals. The appliqué system uses this time delay mechanism to compensate for its own processing delays so that its presence is transparent to the existing base station. Angle of arrival calculations are made to determining beamforming parameters. The antenna of the four element antenna system are separated by is (51/2 _1)/2 times the wavelength. Angle of arrival for the strongest uplink multipath signal are used to direct the downlink beam.

La présente invention concerne un procédé de formation de faisceau pour un système d'interface à antennes intelligentes. Le système d'interface de l'invention utilise une fonction chien de garde pour surveiller les canaux de diffusion d'une station de base radio mobile à laquelle il est attaché. Le système d'interface se synchronise automatiquement en temps et fréquence sur la station de base. En GSM, on utilise des retards de synchronisation pour empêcher les conflits entre créneaux temporels en provenance de divers terminaux mobiles. Le système d'interface utilise ce mécanisme de retards de synchronisation pour compenser ses propres retards de traitement de façon que sa présence soit transparente pour la station de base existante. Des calculs d'angles d'incidence permettent de déterminer les paramètres de formation des faisceaux. Les antennes du système d'antennes à quatre éléments sont séparés par 5?1/2¿ 1)/2 fois la longueur d'ondes. C'est l'angle d'incidence du plus puissant des signaux multivoie de la liaison montante qui sert pour diriger le faisceau de la liaison descendante.

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