Method and apparatus for closed loop transmission

Details Method and apparatus for closed loop transmission Method and apparatus for closed loop transmission

H - Electricity

04

Q

H04Q 7/20 (2006.01)

Patent

CA 2548628

In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time- frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response.

L'invention concerne un procédé et un appareil pour émission en boucle fermée, dans un système de communication sans fil. Conformément à une forme d'exécution préférée de l'invention, une portion temps-fréquence d'une trame à liaison montante est réservée dynamiquement en tant que zone de sondage pour le sondage d'un canal ascendant. Un premier message est émis à une première station d'abonné dans une trame à liaison descendante, attribuant une ressource temps-fréquence dans une zone de sondage, et une forme d'onde de sondage. En outre, un signal est reçu de la station d'abonné, dans la ressource temps-fréquence attribuée, une réponse de canal partielle est déterminée à partir du signal de sondage reçu, et l'émission subséquente à la station d'abonné est personnalisée sur la base d'au moins une réponse partielle de canal.

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