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1. WO1996042146 - CDMA DEMODULATOR

Publication Number WO/1996/042146
Publication Date 27.12.1996
International Application No. PCT/JP1996/001582
International Filing Date 12.06.1996
IPC
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
H04B 7/005 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
005Control of transmission; Equalising
CPC
H04B 1/71075
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
7097Interference-related aspects
7103the interference being multiple access interference
7107Subtractive interference cancellation
71075Parallel interference cancellation
H04B 2001/71077
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
7097Interference-related aspects
7103the interference being multiple access interference
7107Subtractive interference cancellation
71077Partial interference cancellation
H04W 52/12
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
52Power management, e.g. TPC [Transmission Power Control], power saving or power classes
04TPC
06TPC algorithms
12Outer and inner loops
Applicants
  • NTT MOBILE COMMUNICATIONS NETWORK INC. [JP]/[JP] (AllExceptUS)
  • SAWAHASHI, Mamoru [JP]/[JP] (UsOnly)
  • ANDOU, Hidehiro [JP]/[JP] (UsOnly)
  • MIKI, Yoshinori [JP]/[JP] (UsOnly)
  • HIGUCHI, Kenichi [JP]/[JP] (UsOnly)
Inventors
  • SAWAHASHI, Mamoru
  • ANDOU, Hidehiro
  • MIKI, Yoshinori
  • HIGUCHI, Kenichi
Agents
  • TANI, Yoshikazu
Priority Data
7/14619113.06.1995JP
7/14647313.06.1995JP
7/32078708.12.1995JP
7/32588114.12.1995JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) CDMA DEMODULATOR
(FR) DEMODULATEUR AMDC
Abstract
(EN)
A CDMA demodulator which is improved in interference canceling effect even when signals are sent from many communicators. The demodulator receives signals sent from a plurality of communicators and having a frame structure in which a pilot signal having a known pattern is inserted between information signals at regular time intervals. The demodulator includes interference cancellers which demodulate the data transmitted from the communicators, and estimate interference signals. The demodulator estimates the variation of each path of the channels, performs the demodulation of received data, and estimates the interference signal replica. The errors of the interference signal replica decrease as the data pass the interference cancellers, producing a marked interference canceling effect. When the interference cancellation is executed after detecting the reception level of each channel from the total sum of the received electric power of the paths of the channels and determining the ranks of the channels in order of reception level, a further marked interference canceling effect is exhibited.
(FR)
La présente invention concerne un démodulateur AMDC dont l'effet de suppression des interférences est amélioré même quand des signaux proviennent de nombreux dispositifs de communication. Le démodulateur reçoit des signaux envoyés par plusieurs dispositifs de communication et ayant une structure de trame dans laquelle un signal pilote ayant une forme connue est intercalé entre des signaux d'information à des intervalles de temps réguliers. Ce démodulateur comprend des dispositifs de suppression d'interférences qui démodulent les données émises à partir des dispositifs de communication, et évaluent les signaux d'interférence. Le démodulateur évalue la variation de chaque parcours des canaux, effectue la démodulation des données reçues et évalue la réplique du signal d'interférence, réplique dont les erreurs diminuent lorsque les données passent par les dispositifs de suppression d'interférences, ce qui produit un effet marqué de suppression des interférences. Quand la suppression des interférences est exécutée après la détection du niveau de réception de chaque canal dans la somme totale de la puissance électrique reçue des parcours des canaux et après la détermination des rangs des canaux dans l'ordre des niveaux de réception, un effet supplémentaire notable de suppression des interférences se manifeste.
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