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1. WO1997014235 - CONFIDENCE AND FRAME SIGNAL QUALITY DETECTION IN A SOFT DECISION CONVOLUTIONAL DECODER

Publication Number WO/1997/014235
Publication Date 17.04.1997
International Application No. PCT/GB1996/002423
International Filing Date 03.10.1996
Chapter 2 Demand Filed 11.04.1997
IPC
H03M 13/35 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
35Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
H03M 13/45 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
45Soft decoding, i.e. using symbol reliability information
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
H04L 1/20 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
20using signal-quality detector
CPC
H03M 13/09
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
03Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
05using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
09Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
H03M 13/275
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
27using interleaving techniques
275Interleaver wherein the permutation pattern is obtained using a congruential operation of the type y=ax+b modulo c
H03M 13/3723
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
3723using means or methods for the initialisation of the decoder
H03M 13/3738
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
3738with judging correct 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
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
  • BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY [GB]/[GB] (AllExceptUS)
  • WONG, Wing, Tak, Kenneth [GB]/[GB] (UsOnly)
  • WONG, Danny, Yuk-Kun [GB]/[GB] (UsOnly)
Inventors
  • WONG, Wing, Tak, Kenneth
  • WONG, Danny, Yuk-Kun
Agents
  • LLOYD, Barry, George, William
Priority Data
9520445.906.10.1995GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CONFIDENCE AND FRAME SIGNAL QUALITY DETECTION IN A SOFT DECISION CONVOLUTIONAL DECODER
(FR) DETECTION DE LA FIABILITE ET DE LA QUALITE DU SIGNAL DE TRAME DANS UN DECODEUR CONVOLUTIF A DECISION PROGRAMMABLE
Abstract
(EN)
Received signals are processed (111) to generate confidence measure signals. Before these are forwarded to a soft decision decoder (116), correction factors are applied, e.g. by a look-up table (113), to reduce the extent to which the signals differ from a logarithmic representation of the error statistics of the received signals. Alternatively, or as well, the confidence measure signals may be summed (122) and thresholded (123) to provide a quality-indicating signal. In a coder, error check bits for a frame of bits to be convolutionally coded are generated from bits taken from the beginning and end of the frame but not the middle.
(FR)
Les signaux reçus sont traités (111) de façon à générer des signaux de mesure de fiabilité. Avant que ceux-ci ne soient transmis à un décodeur à décision programmable (116), des facteurs de correction sont appliqués, par exemple par une table de consultation (113), de façon à diminuer l'écart entre les signaux et une représentation logarithmique des statistiques d'erreur des signaux reçus. Selon un autre mode de réalisation, ou bien dans le même, les signaux de mesure de fiabilité peuvent être additionnés (122) et traités par seuillage (123) de façon à obtenir un signal indicateur de qualité. Dans un codeur, les bits de contrôle d'erreur destinés à une trame de bits devant être soumise à un codage convolutif sont générés à partir de bits tirés du début et de la fin de la trame, mais pas du milieu.
Also published as
MXPA/a/1998/002688
NO19981525
NZ319215
Other related publications
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