Apparatus and method for transmitting signals in a...

H - Electricity – 04 – B

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H04B 7/02 (2006.01) H04B 7/06 (2006.01) H04J 11/00 (2006.01) H04L 1/02 (2006.01) H04B 7/005 (2006.01) H04B 1/69 (2006.01)

Patent

CA 2302491

Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaves (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

Aux fins d'émission en diversité de type orthogonal, on utilise un séparateur de données (803) pour subdiviser l'information de voie (801) au moins en une première série de bits (802) et une seconde série de bits (804). Chaque série fait l'objet d'un étalement sur la base de son propre code de Walsh, pour transmission ultérieure à une station mobile via une fréquence porteuse prédéterminée. Quand le nombre de bits des première et seconde séries (802, 804) est faible, on utilise des codes de Walsh séparés afin de maintenir l'orthogonalité. Lorsque le nombre de bits des première et seconde séries (802, 804) est relativement élevé, on utilise le multiplexage temporel afin de maintenir l'orthogonalité. Un régisseur (809) contrôle à la fois la subdivision de l'information de voie et un dispositif d'entrelacement (308) pour améliorer encore les effets de l'émission en diversité. L'information de contrôle liée à la subdivision est transmise à la station mobile, de manière à permettre une reconstitution précise de l'information de voie avant le décodage.

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