Pn generators for spread spectrum communications systems

H - Electricity – 04 – B

Patent

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H04B 1/707 (2011.01) H04J 13/10 (2011.01) H04B 7/216 (2006.01)

Patent

CA 2398673

Techniques to improve the acquisition process in a spread spectrum environment. The signals from different CDMA systems are spread with different sets of pan sequences, with the pan sequences in each set being uncorrelated to the pan sequences in the other sets. By using uncorrelated PN sequences. the likehood of detecting a pilot signal from an undesired system is reduced or minimized, and the mean time to acquisition of the pilot signal from the desired system is improved. The mobile station can attempt to acquire the pilot signal by processing the received signal with a first set of PN sequences corresponding to a first hypothesis of the particular signal being acquired. If acquisition of the pilot signal fails, a second set of PN sequences corresponding to a second hypothesis is selected and used to process the received signal. The PN sequences in the second set are uncorrelated to the PN sequences in the first set. The PN sequences for the first set can be generated based on the characteristic polynomials defined by IS-95-A, and the PN sequences for the second set can be the reverse of the PN sequences for the first set.

L'invention concerne des techniques d'amélioration du procédé d'acquisition dans un environnement à spectre étalé. Les signaux provenant de différents systèmes AMCR (accès multiple par code de répartition) sont étalés à l'aide de différents ensembles de séquences PN (de nombres pseudo-aléatoires), les séquences PN de chaque ensemble n'étant pas corrélées aux séquences PN d'autres ensembles. En utilisant des séquences PN non corrélées, on réduit ou minimise la possibilité de détection d'un signal pilote à partir d'un système non voulu, et on améliore le temps moyen d'acquisition du signal pilote, à partir du système voulu. La station mobile peut tenter d'acquérir le signal pilote en traitant le signal reçu à l'aide d'un premier ensemble de séquences PN correspondant à la première hypothèse du signal pilote en cours d'acquisition. Si l'acquisition du signal pilote échoue, un second ensemble de séquences PN, correspondant à la seconde hypothèse, est choisi et utilisé pour traiter le signal reçu. Les séquences PN du second ensemble ne sont pas corrélées aux séquences PN du premier ensemble. Les séquences PN du premier ensemble peuvent être produites d'après les polynômes caractéristiques définis par IS-95-A, et les séquences PN du second ensemble peuvent être l'inverse de celles du premier ensemble.

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