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1. WO1996004716 - METHOD AND APPARATUS FOR PERFORMING CODE ACQUISITION IN A CDMA COMMUNICATIONS SYSTEM

Publication Number WO/1996/004716
Publication Date 15.02.1996
International Application No. PCT/US1995/008659
International Filing Date 10.07.1995
IPC
H04B 1/7075 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
7073Synchronisation aspects
7075with code phase acquisition
H04B 1/7077 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
7073Synchronisation aspects
7075with code phase acquisition
7077Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
CPC
H04B 1/70754
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
7073Synchronisation aspects
7075with code phase acquisition
70754Setting of search window, i.e. range of code offsets to be searched
H04B 1/70755
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
7073Synchronisation aspects
7075with code phase acquisition
70755Setting of lock conditions, e.g. threshold
H04B 1/7077
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
7073Synchronisation aspects
7075with code phase acquisition
7077Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
H04B 2201/70701
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
2201Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
69Orthogonal indexing scheme relating to spread spectrum techniques in general
707relating to direct sequence modulation
70701featuring pilot assisted reception
Applicants
  • QUALCOMM INCORPORATED [US/US]; 6455 Lusk Boulevard San Diego, CA 92121, US
Inventors
  • SUTTON, Todd, R.; US
Agents
  • MILLER, Russell, B.; Qualcomm Incorporated 6455 Lusk Boulevard San Diego, CA 92121, US
Priority Data
283,30429.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR PERFORMING CODE ACQUISITION IN A CDMA COMMUNICATIONS SYSTEM
(FR) PROCEDE ET APPAREIL POUR REALISER L'ACQUISITION DE CODES DANS UN SYSTEME DE COMMUNICATION A ACCES MULTIPLE PAR DIFFERENCE DE CODE
Abstract
(EN)
A novel and improved method of acquisition in a spread spectrum communication system is presented. In the present invention, a large window of PN chip offset hypotheses are searched which are generated by a PN sequence generator (20) under the control of a searcher controller (18). The energy of the despread sequence which is despread by a despreader (6) is found that might indicate the presence of the pilot signal in a threshold comparer (16) having one of the chip offsets of the large search window, then a search of a subset of offset hypotheses, or small window, is searched under the control of searcher controller (18).
(FR)
On décrit un nouveau procédé d'acquisition amélioré dans un système de communication à spectre étalé. Dans la présente invention, on recherche une large fenêtre d'hypothèses de décalage des bits de bruit pseudo-aléatoire produits par un générateur (20) de séquences de bruit pseudo-aléatoire sous le contrôle d'une commande de recherche (18). On détermine l'énergie de la séquence à annulation d'étalement par un dispositif d'annulation d'étalement (6), qui pourrait indiquer la présence du signal pilote dans un comparateur de seuil (16) ayant un des décalages de bits de la large fenêtre de recherche, après quoi on effectue une recherche sur un sous-ensemble d'hypothèses de décalage (petite fenêtre), sous le contrôle de la commande de recherche (18).
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