Methods and apparatus for identifying a preamble sequence...

H - Electricity – 04 – L

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H04L 27/26 (2006.01)

Patent

CA 2706470

In accordance with a method for identifying a preamble sequence and for estimating an integer carrier frequency offset, a signal that comprises a preamble sequence from a set of possible preamble sequences is received. A reduced set of integer carrier frequency offset (CFO) candidates may be determined. Cross-correlation operations may be performed with respect to the received signal and multiple candidate transmitted signals. Each candidate transmitted signal may include one of the set of possible preamble sequences. In addition, each candidate transmitted signal may correspond to one of the reduced set of integer CFO candi-dates. Multiple correlation values may be determined as a result of the cross-correlation operations. The correlation values may be used to identify the preamble sequence and to estimate the integer CFO.

Selon un procédé permettant d'identifier une séquence de préambule et d'estimer un décalage fréquentiel de porteuse entier, un signal est reçu qui comprend une séquence de préambule parmi un ensemble de séquences de préambule possibles. Un ensemble réduit de candidats de décalage fréquentiel de porteuse (CFO) entier peut être déterminé. Les opérations d'intercorrélation peuvent être effectuées par rapport au signal reçu et aux multiples signaux candidats transmis. Chaque signal candidat transmis peut comprendre une séquence de l'ensemble de séquences de préambule possibles. De plus, chaque signal candidat transmis peut correspondre à un candidat de l'ensemble réduit de candidats de CFO entier. De multiples valeurs de corrélation peuvent être déterminées en conséquence des opérations d'intercorrélation. Les valeurs de corrélation peuvent être utilisées pour identifier la séquence de préambule et pour estimer le CFO entier.

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