A rapid-acquisition access channel scheme for cdma systems

H - Electricity – 04 – B

Patent

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Details

H04B 7/216 (2006.01) H04J 11/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2248647

A spread spectrum CDMA communication system in which a station transmits a short synchronization signal to allow a second station to (1) recognize that a signal is present, (2) resolve frequency uncertainty, (3) acquire the spreading code timing, (4) acquire frame and symbol synchronization, and (5) demodulate data which may contain user identification and other data. The rapid acquisition channel (RAC) includes a burst signal comprising of an Acquisition Field during which the carrier is biphase modulated with a pseudo-noise (PN) sequence, a Sync Field during which a synchronization sequence is mod-2 added to the PN sequence with one chip of the sync sequence equal to one or more periods of the PN sequence, and a data field with m-ary orthogonal code words mod-2 added to the PN sequence with one chip of the code word equal to one or more periods of the PN sequence.

Système de transmission AMCR à spectre étalé dans lequel une station émet un signal bref de synchronisation pour qu'une deuxième station (1) reconnaisse la présence d'un signal, (2) résolve l'incertitude quant à la fréquence, (3) acquière la synchronisation du code d'étalement, (4) acquière la synchronisation de trame et de symboles et (5) démodule les données pouvant contenir l'indicatif de l'usager et d'autres données. La voie d'acquisition rapide comporte un signal de synchronisation de salves incluant une zone d'acquisition pendant laquelle la porteuse est modulée par déplacement de phase par une séquence de pseudo-bruit, une zone de synchronisation pendant laquelle une séquence de synchronisation est ajoutée en mod-2 à la séquence de pseudo-bruit, un élément de la séquence de synchronisation étant égal à une ou deux périodes de la séquence de pseudo-bruit, et une zone de données avec des mots en code orthogonal m-aire ajoutés en mod-2 à la séquence de pseudo-bruit, un élément du mot du code étant égal à une ou plusieurs périodes de la séquence de pseudo-bruit.

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