Method for compensating for multi-path

Details Method for compensating for multi-path Method for compensating for multi-path

H - Electricity

04

B

H04B 7/005 (2006.01) H04B 1/12 (2006.01) H04B 15/00 (2006.01)

Patent

CA 2554404

A base station receives a reverse link signal from a given field unit that includes a common code (i.e., shared by other field units) and a unique orthogonal code (i.e., distinguishing the given field unit from other field units). The reverse link signal travels in a multi-path environment along a primary path at least one secondary path. The base station makes a diversity decision based on the unique orthogonal code seen at two different phases. The base station determines a gross timing offset to align the common code of the given field unit with the common code from other field units using unique orthogonal codes. The given field unit makes a corresponding coarse adjustment of the phase of its common code.

Une station de base reçoit un signal de liaison de retour provenant d'une unité de champ donnée et qui comprend un code commun (c.-à-d. partagé par d'autres unités de champ) et un code orthogonal non équivoque (c.-à-d. qui distingue l'unité de champ donnée des autres unités de champ). Le signal de liaison de retour se propage dans un environnement à trajets multiples suivant un trajet principal et au moins un trajet secondaire. La station de base prend une décision de diversité sur la base du code orthogonal détecté à deux phases différentes. La station de base détermine un décalage grossier de base de temps afin d'aligner, au moyen de codes orthogonaux non équivoques, le code commun de l'unité de champ donnée sur celui d'autres unités de champ. L'unité de champ donnée règle grossièrement de façon correspondante la phase de son code commun.

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