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1. WO1999057817 - CODE DIVISION MULTIPLE ACCESS TRANSMITTER AND RECEIVER

Publication Number WO/1999/057817
Publication Date 11.11.1999
International Application No. PCT/IB1999/000726
International Filing Date 22.04.1999
IPC
H04B 1/00 2006.01
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
H04B 1/04 2006.01
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
02Transmitters
04Circuits
H04B 1/16 2006.01
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
06Receivers
16Circuits
H04B 1/707 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
CPC
H04B 1/707
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
H04B 1/709
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
709Correlator structure
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL]
  • PHILIPS AB [SE]/[SE] (SE)
Inventors
  • KHALIFA, Nabil
Agents
  • LANDOUSY, Christian
Priority Data
98401054.630.04.1998EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CODE DIVISION MULTIPLE ACCESS TRANSMITTER AND RECEIVER
(FR) EMETTEUR /RECEPTEUR A ACCES MULTIPLE PAR CODE DE REPARTITION
Abstract
(EN)
The invention relates to a code division multiple access transmitter, in which the data to be transmitted drive a frequency synthesizer which in turn generates the clock of a pseudo-noise code generator with a slight frequency offset. In the corresponding receiver, said frequency offset observed at the transmitting side affects proportionally a correlation magnitude. At the end of each correlation period, the correlation results are then compared to thresholds and the demodulated data are finally extracted. Application: mobile communications.
(FR)
La présente invention concerne un émetteur à accès multiple par code de répartition dans lequel les données à transmettre commandent un synthétiseur de fréquences qui engendre lui-même bruit avec un léger déphasage une horloge pour un générateur de code à pseudobruit. Au niveau du récepteur correspondant, le déphasage observé à une incidence proportionnelle sur l'ampleur de la corrélation. A la fin de chaque période de corrélation, les résultats de corrélation sont comparés à des seuils et les données démodulées sont finalement extraites. Utilisation: communications mobiles.
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