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1. WO2006095061 - METHOD FOR THE FLEXIBLE DEMODULATION OF ESTIMATED COMPLEX SYMBOLS

Publication Number WO/2006/095061
Publication Date 14.09.2006
International Application No. PCT/FR2005/050149
International Filing Date 08.03.2005
Chapter 2 Demand Filed 28.11.2006
IPC
H04L 25/06 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
06Dc level restoring means; Bias distortion correction
H04L 5/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
5Arrangements affording multiple use of the transmission path
02Channels characterised by the type of signal
CPC
H04L 25/067
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
06Dc level restoring means; Bias distortion correction ; decision circuits providing symbol by symbol detection
067providing soft decisions, i.e. decisions together with an estimate of reliability
H04L 5/026
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
5Arrangements affording multiple use of the transmission path
02Channels characterised by the type of signal
023Multiplexing of multicarrier modulation signals
026using code division
Applicants
  • COMMISSARIAT A L'ENERGIE ATOMIQUE [FR]/[FR] (AllExceptUS)
  • KTENAS, Dimitri [FR]/[FR] (UsOnly)
  • BOUVIER DES NOES, Mathieu [FR]/[FR] (UsOnly)
  • BARLETTA, Julien [FR]/[FR] (UsOnly)
  • GUYON, Claire [FR]/[FR] (UsOnly)
Inventors
  • KTENAS, Dimitri
  • BOUVIER DES NOES, Mathieu
  • BARLETTA, Julien
  • GUYON, Claire
Agents
  • LEHU, Jean
  • RICHARD, Patrick
Priority Data
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) METHOD FOR THE FLEXIBLE DEMODULATION OF ESTIMATED COMPLEX SYMBOLS
(FR) PROCEDE DE DEMODULATION SOUPLE DE SYMBOLES COMPLEXES ESTIMES
Abstract
(EN)
The invention relates to a method for the flexible demodulation of estimated complex symbols y(k) (k=1, 2, ..., K), consisting in calculating a log-likelihood ratio (LLR) such as formula (I), wherein: bI,q is the qth coded bit of a phase part of a signal emitted, ß is the asymptotic signal-to-interference-plus-noise ratio, y(k) is a standardised symbol that is associated with y(k), ? is a reference QAM constellation symbol that is associated with a QAM-M modulation, and S(1)I,q and S(0)I,q are partitions of the complex plane which group together, respectively, all of the ? reference symbols having a 1 at position (I, q) and all of the ? reference symbols having a 0 at position (I, q) a similar LLR formula being provided for bit bQ,p, the pth coded bit of a quadrature part of the emitted signal. The invention is suitable for code division multiple access transmission systems.
(FR)
L'invention concerne un procédé de démodulation souple de symboles complexes estimés y(k) (k=1, 2, ..., K) par calcul d'un Logarithme de Rapport de Vraisemblance (LRV) tel que la formule (I) suivante ; où bI,q est le qième bit codé d'une partie en phase d'un signal émis, &bgr; est un Rapport Signal à Interférences plus Bruit asymptotique, y(k) est un symbole normalisé y associé à y(k), &lgr; est un symbole de référence de constellation MAQ associée à une modulation MAQ-M, S(1)I,q et S(0)I,q sont des partitions du plan complexe qui regroupent, respectivement, l'ensemble des symboles de référence &lgr; ayant un « 1 » à la position (I, q) et l'ensemble des symboles de référence &lgr; ayant un « 0 » à la position (I, q), une formule similaire de LRV étant donné pour le bit bQ,p, pième bit codé d'une partie en quadrature du signal émis. L'invention s'applique aux systèmes de transmission à accès multiples par répartition de codes.
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