Methods and apparatus for reducing a sampling rate during a...

H - Electricity – 03 – M

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H03M 1/12 (2006.01) H04L 7/02 (2006.01) H04L 7/10 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2551709

A received signal is sampled at a sampling period of T + m*(T/n) during a sampling phase determination process. T is a symbol or chip period of the received signal, n is a number of phases of the sampled signal, T/n is a phase resolution period, and m is a fixed non-zero integer value where - n < m < n (e.g. m =1 or -1). By sampling the received signal at the sampling period of T + m*(T/n), a sample set for each one of n phases of the sampled signal is produced. For each sample set, a correlation process is performed between the sample set and a predetermined correlation signal to produce a correlation result. Once an optimal correlation result is identified from the correlation process, the received signal is sampled at a sampling period of T at a phase associated with the optimal correlation result. Advantageously, oversampling at a sampling rate of n/T is not required during the sampling phase determination process, which reduces cost and power consumption.

Un signal reçu est échantillonné pendant une période d'échantillonnage de T + m*(T/n) dans le cadre d'un processus de détermination de phase d'échantillonnage. T désigne le symbole ou la période de débit des éléments du signal reçu, tandis que n désigne le nombre de phases du signal échantillonné, T/n étant la période de résolution de phase, et m, une valeur entière non nulle, soit - n < m < n (par exemple, m =1 ou -1). Par l'échantillonnage du signal reçu pendant la période d'échantillonnage T + m*(T/n), un ensemble d'échantillons de chacune des phases n du signal échantillonné est créé. Pour chaque ensemble d'échantillons, une corrélation est établie entre l'ensemble d'échantillons et un signal de corrélation prédéterminé dans le but de produire un résultat de corrélation. Dès qu'un résultat de corrélation optimale est obtenu par l'opération de corrélation, le signal reçu est échantillonné pendant une période d'échantillonnage T au cours d'une phase associée au résultat de corrélation optimale. Le système présente des avantages, car le suréchantillonnage à un taux d'échantillonnage de n/T est inutile au cours de la détermination de la phase d'échantillonnage, ce qui réduit d'autant les coûts et la consommation d'énergie.

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