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1. WO2004049661 - CALCULATION OF SOFT DECISION VALUES USING RELIABILITY INFORMATION OF THE AMPLITUDE

Publication Number WO/2004/049661
Publication Date 10.06.2004
International Application No. PCT/EP2003/011230
International Filing Date 09.10.2003
Chapter 2 Demand Filed 08.05.2004
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 27/38 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18, or H04L27/26213
34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
38Demodulator circuits; Receiver circuits
CPC
H04L 1/0045
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
004by using forward error control
0045Arrangements at the receiver end
H04L 1/18
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
12by using return channel
16in which the return channel carries supervisory signals, e.g. repetition request signals
18Automatic repetition systems, e.g. van Duuren system ; ; ARQ protocols
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 27/38
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
38Demodulator circuits; Receiver circuits
Applicants
  • TELEFONAKTIEBOLAGET LM ERICSSON (publ) [SE]/[SE] (AllExceptUS)
  • BERNHARDSSON, Bo [SE]/[SE] (UsOnly)
  • LINDOFF, Bengt [SE]/[SE] (UsOnly)
  • MALM, Peter [SE]/[SE] (UsOnly)
Inventors
  • BERNHARDSSON, Bo
  • LINDOFF, Bengt
  • MALM, Peter
Agents
  • ZACCO DENMARK A/S
Priority Data
02388074.322.11.2002EP
60/429,57926.11.2002US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CALCULATION OF SOFT DECISION VALUES USING RELIABILITY INFORMATION OF THE AMPLITUDE
(FR) CALCUL DE VALEURS DE DECISION SOUPLE AU MOYEN DE DONNEES DE FIABILITE SUR L'AMPLITUDE
Abstract
(EN)
A method of decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme, such as 16-QAM, including amplitude information. The method comprises the steps of generating (406) a likelihood value for a received communications signal; decoding (408) the communications signal based on at least the generated likelihood value. The method further comprises providing (302) a reliability indication of the amplitude information conveyed by the received communications signal; and generating the likelihood value on the basis of the provided reliability indication of the amplitude information.
(FR)
Procédé de décodage d'un signal de communication dans un système de communications numériques, selon lequel ledit signal est modulé selon un programme de modulation, tel que 16-QAM, avec données d'amplitude. Le procédé consiste à générer (406) une valeur de vraisemblance pour un signal de communications reçu et à décoder (408) ce signal à partir d'au moins la valeur de vraisemblance générée. De plus, le procédé consiste à fournir (302) une indication de fiabilité des données d'amplitude acheminées par le signal de communication reçu et de générer la valeur de vraisemblance à partir de l'indication de fiabilité fournie des données d'amplitude.
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