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1. WO2002023787 - METHOD AND APPARATUS FOR SOFT INFORMATION GENERATION IN JOINT DEMODULATION OF CO-CHANNEL SIGNALS

Publication Number WO/2002/023787
Publication Date 21.03.2002
International Application No. PCT/US2001/023922
International Filing Date 10.09.2001
Chapter 2 Demand Filed 30.01.2002
IPC
H03M 13/41 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
13Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
37Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03-H03M13/35153
39Sequence estimation, i.e using statistical methods for the reconstruction of the original codes
41using the Viterbi algorithm or Viterbi processors
H04L 1/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
CPC
H03M 13/3905
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
13Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
37Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
39Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
3905Maximum a posteriori probability [MAP] decoding or approximations thereof based on trellis or lattice decoding, e.g. forward-backward algorithm, log-MAP decoding, max-log-MAP decoding
H03M 13/41
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
13Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
37Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
39Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
41using the Viterbi algorithm or Viterbi processors
H03M 13/6325
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
13Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
63Joint error correction and other techniques
6325Error control coding in combination with demodulation
H04L 1/0054
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
0054Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
Applicants
  • ERICSSON, INC. [US]/[US] (AllExceptUS)
  • ARSLAN, Huseyin [TR]/[US] (UsOnly)
  • MOLNAR, Karl, James [US]/[US] (UsOnly)
Inventors
  • ARSLAN, Huseyin
  • MOLNAR, Karl, James
Agents
  • BENTLEY, J., Olive
  • PHILLIPS, Steven, B.
Priority Data
09/660,05312.09.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR SOFT INFORMATION GENERATION IN JOINT DEMODULATION OF CO-CHANNEL SIGNALS
(FR) PROCEDE ET APPAREIL PERMETTANT DE PRODUIRE DES INFORMATIONS MOLLES DANS LA DEMODULATION COMMUNE DE SIGNAUX SUR VOIE COMMUNE
Abstract
(EN)
A method and apparatus generated soft values from a co-channel differentially encoded received signals. The soft values are generated by determining jointly detected symbols and corresponding joint metrics. A first potential nondetected metric sum is determined by flipping the current desired coherent detected symbol and keeping the interfered coherent detected symbol as is. A second potential nondetected metric sum is determined by flipping the previous desired coherent detected symbol and keeping the interfered coherent detected symbol as is. A minimum between the difference of the detected jont metrics and the two nondetected joint metrics is found. The soft values are then established based on the minimum difference metric.
(FR)
Procédé et appareil permettant de produire des valeurs molles à partir de signaux sur voie commune codés de manière différentielle reçus. Les valeurs molles sont produites par détermination de symboles détectés conjointement et de la métrologie commune correspondante. Une première somme métrique non détectée potentielle est déterminée par retournement du symbole détecté cohérent désiré actuel et maintien du symbole détecté cohérent brouillé tel qu'il est. Une seconde somme métrique non détectée potentielle est déterminée par retournement du symbole détecté cohérent désiré précédent et maintien du symbole détecté cohérent brouillé tel qu'il est. Un minimum est trouvé entre la différence de la métrologie commune détectée et des deux métrologies communes non détectées. Les valeurs molles sont ensuite établies sur la base de la différence minimale de métrologie.
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