Interference cancellation under non-stationary conditions

H - Electricity – 04 – B

Patent

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Details

H04B 7/01 (2006.01) H04W 56/00 (2009.01) H04L 7/00 (2006.01)

Patent

CA 2723730

A method for timing and frequency synchronization in a wireless system is provided. The method comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols, iteratively adjusting the subset of the burst of symbols by a plurality of timing offsets and calculating, for each timing offset, a first performance metric corresponding to the adjusted subset. The method further comprises the steps of determining one of the plurality of timing offsets to be a preferred timing offset based upon the first performance metric thereof, iteratively rotating the subset of the burst of symbols by a plurality of frequency offsets and calculating, for each frequency offset, a second performance metric corresponding to the rotated subset, and determining one of the plurality of frequency offsets to be a preferred frequency offset based upon the second performance metric thereof.

L'invention porte sur un procédé de synchronisation de temps et de fréquence dans un système sans fil. Le procédé comprend les étapes de réception d'une salve de symboles, sélection d'un sous-ensemble de la salve de symboles, ajustement itératif du sous-ensemble de la salve de symboles par une pluralité de décalages temporels et calcul, pour chaque décalage temporel, d'une première métrique de performance correspondant au sous-ensemble ajusté. Le procédé comprend en outre les étapes de détermination de l'un de la pluralité de décalages temporels comme étant un décalage temporel préféré sur la base de sa première métrique de performance, rotation itérative du sous-ensemble de la salve de symboles par une pluralité de décalages de fréquence et calcul, pour chaque décalage de fréquence, d'une seconde métrique de performance correspondant au sous-ensemble fait tourner, et détermination de l'un de la pluralité de décalages de fréquence comme étant un décalage de fréquence préféré sur la base de sa seconde métrique de performance.

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