Method and apparatus for transmitting signals in a...

Details Method and apparatus for transmitting signals in a... Method and apparatus for transmitting signals in a...

H - Electricity

04

B

H04B 15/00 (2006.01) H04B 7/06 (2006.01) H04B 7/10 (2006.01) H04K 1/00 (2006.01) H04L 27/30 (2006.01) H04J 11/00 (2006.01)

Patent

CA 2298647

Different orthogonal codes (W x, W y) are used to spread common pilot channels (Pilot A) intended for transmission to a particular mobile station (106) within a coverage area (sector A) to implement forward link transmit diversity. By implementing separate, different orthogonal codes (W x, W y) for each pilot channel (Pilot A), the pilot signals transmitted via antennas (218, 222) to a common coverage area (sector A) are orthogonal to one another and thus do not degrade system performance. Additionally, the use of different orthogonal codes (W x, W y) for each pilot channel (Pilot A) allows the mobile station (106) to discern which pilot channel spread with a different orthogonal code includes corresponding traffic channel (TCH) information. This allows forward link transmit diversity to be enabled/disabled based on conditions associated with the environment, the communications channel, etc. without a complete loss of information as seen by the mobile station (106).

On utilise différents codes orthogonaux (Wx, Wy) pour étaler des canaux pilotes communs (PilotA) servant à des transmissions avec une station mobile particulière (106) à l'intérieur d'une aire de couverture (secteur A) pour créer une transmission en diversité sur liaison aller. Du fait de l'attribution de codes orthogonaux (Wx, Wy) séparés et différents à chacun des canaux pilotes (PilotA), les signaux pilotes transmis via des antennes (218, 222) à la zone commune de couverture (secteur A) sont orthogonaux les uns par rapport aux autres et de ce fait ne dégradent pas les performances du système. De plus, l'utilisation de codes orthogonaux (Wx, Wy) séparés et différents pour chacun des canaux pilotes (PilotA) permet à la station mobile (106) de discerner quel étalement de canal pilote présentant un code orthogonal différent comporte les informations correspondantes sur le trafic du canal. Cela permet de valider/invalider les transmission en diversité sur liaisons aller en fonction de conditions liées à l'environnement, aux canaux de communication, etc. sans perdre totalement les informations telles que les perçoit la station mobile (106).

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