H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 7/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01)
Patent
CA 2212067
A CDMA synchronous acquisition circuit for receiving a CDMA signal and performing synchronous acquisition on the CDMA signal, comprises a receiving unit for receiving a signal and decoding the received signal to a reception base band signal which is spread-modulated in a CDMA mode, a correlation circuit for calculating a correlation value for the received base band signal every timing within one chip of a spread code by a correlator, and means for detecting the maximum value of the correlation value to estimate the spread code generation timing of a spread-modulated transmission base band signal within a precision of one chip of the spread code, wherein the correlator includes offset removing means for removing a DC offset component due to unbalance of the code balance of the spread code.
L'invention est un circuit utilisé pour recevoir un signal AMDC et effectuer une acquisition synchrone sur ce dernier. Le circuit de l'invention comporte une unité servant à recevoir un signal et à décoder celui-ci pour obtenir un signal de bande de base modulé par étalement en mode AMDC, un circuit de corrélation servant à calculer la valeur de corrélation du signal de bande de base reçu au moyen d'un corrélateur, et un dispositif servant à détecter le maximum de la valeur de corrélation afin d'évaluer le temps de génération par code d'étalement d'un signal de bande de base transmis en modulation par étalement, le corrélateur incluant un dispositif servant à supprimer la composante de décalage en continu dû au déséquilibre du code d'étalement.
Corporation Nec
Smart & Biggar
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