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1. WO1997050183 - VARIABLE LENGTH CODING WITH ERROR PROTECTION

Publication Number WO/1997/050183
Publication Date 31.12.1997
International Application No. PCT/SE1997/001149
International Filing Date 25.06.1997
Chapter 2 Demand Filed 12.12.1997
IPC
H03M 7/42 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits
30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
40Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
42using table look-up for the coding or decoding process, e.g. using read-only memory
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 7/42
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same ; , similar or subset of; information is represented by a different sequence or number of digits
30Compression
40Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
42using table look-up for the coding or decoding process, e.g. using read-only memory
H04L 1/0059
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
0056Systems characterized by the type of code used
0059Convolutional codes
H04L 1/0071
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
0056Systems characterized by the type of code used
0071Use of interleaving
Applicants
  • TELEFONAKTIEBOLAGET LM ERICSSON (publ) [SE]/[SE]
Inventors
  • BÅNG, Karl, Göran
Agents
  • BANDELIN, Hans
Priority Data
08/668,46025.06.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) VARIABLE LENGTH CODING WITH ERROR PROTECTION
(FR) CODAGE EN LONGUEUR VARIABLE AVEC PROTECTION CONTRE LES ERREURS
Abstract
(EN)
Data are transmitted using a source code with error protection. A plurality of code books are provided, with the code words in each book having equal length. No two of the code books have code words of the same length. A marker code is associated with each code book, and is indicative of the length of the code words in that book. For transmission, the code words are interleaved with the marker codes, so that the receiver may determine which code book has been used. Received signals are processed both in the forward direction, and in the backwards direction. This procedure serves to isolate portions of the signal, which contain invalid marker codes. Such portions are excluded from further processing.
(FR)
L'invention concerne des données qui sont transmises par un code source avec protection d'erreurs, et une pluralité de codes. Dans un même code, tous les mots de code sont de longueur égale, les longueurs de mots changeant d'un code à l'autre. Un préfixe de code, associé à chaque code, indique la longueur des mots de code du code. Dans une transmission, les mots de code sont imbriqués aux préfixes de codes de sorte que le récepteur puisse déterminer quel est le code qui a été utilisé. Les signaux reçus sont traités à la fois vers l'avant et vers l'arrière. Cette façon de procéder sert à isoler des parties du signal qui contiennent des préfixes de codes erronés. Ces parties sont exclues du traitement suivant.
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