Method and apparatus for generating pn sequences at...

H - Electricity – 04 – B

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H04B 1/707 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2423471

Techniques to generate a pseudo-random number (PN) sequence at a desired phase using "masking" to adjust the phase of the PN sequence in coarse increments (e.g., 64-PN chip increments) to account for a large phase adjustment. Slewing may then be used to adjust the PN phase in fine increments (e.g., 1/8 PN chip increments) to obtain the desired phase. Prior to each scan for the pilot from a particular base station, a PN mask corresponding to a phase closest to the start of a new search window is applied to a PN generator to obtain an initial phase for the PN sequence. From the initial phase obtained by the applied mask, the PN generator is then slewed to the start of the search window. The masking can be used to obtain a large phase adjustment in less time, which is likely to improve search performance.

L'invention porte sur des techniques d'élaboration d'une suite de nombres pseudoaléatoires (PN) de la phase désirée, au moyen d'un "masquage" ajustant la phase de la suite par incréments grossiers (par exemple incréments de la puce 64 PN) pour donner un large ajustement de phase, puis en recourant pour obtenir la phase désirée à des ajustements fins par décalage circulaire (par exemple incréments de la puce 1/8 PN). Avant chaque balayage effectué par le pilote d'une station de base particulière, on applique au générateur de PN un masque de PN correspondant à la phase la plus proche du début d'une nouvelle fenêtre de recherche afin d'obtenir la phase initiale de la suite de PN. A partir de cette phase initiale, on décale le générateur de PN sur le début d'une nouvelle fenêtre de recherche. Ce masquage peut servir à obtenir un large ajustement de phase en moins de temps, ce qui est censé accroître l'efficacité de la recherche.

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