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1. WO2014094064 - DIGITAL COMMUNICATION SYSTEM

Publication Number WO/2014/094064
Publication Date 26.06.2014
International Application No. PCT/AU2013/001501
International Filing Date 20.12.2013
IPC
H03M 13/29 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
29combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
H03M 13/39 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
H04B 1/30 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
06Receivers
16Circuits
30for homodyne or synchrodyne receivers
H04L 27/10 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
10Frequency-modulated carrier systems, i.e. using frequency-shift keying
H04L 27/12 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
10Frequency-modulated carrier systems, i.e. using frequency-shift keying
12Modulator circuits; Transmitter circuits
H04L 27/14 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
10Frequency-modulated carrier systems, i.e. using frequency-shift keying
14Demodulator circuits; Receiver circuits
CPC
H03M 13/1157
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
11using multiple parity bits
1102Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
1148Structural properties of the code parity-check or generator matrix
1157Low-density generator matrices [LDGM]
H03M 13/1197
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
11using multiple parity bits
1102Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
1191Codes on graphs other than LDPC codes
1194Repeat-accumulate [RA] codes
1197Irregular repeat-accumulate [IRA] codes
H03M 13/2909
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
29combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
2906using block codes
2909Product codes
H03M 13/2957
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
29combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
2957Turbo codes and decoding
H03M 13/3784
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
3784for soft-output decoding of block codes
H03M 13/616
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
61Aspects and characteristics of methods and arrangements for error correction or error detection, not provided for otherwise
615Use of computational or mathematical techniques
616Matrix operations, especially for generator matrices or check matrices, e.g. column or row permutations
Applicants
  • UNIVERSITY OF SOUTH AUSTRALIA [AU]/[AU]
Inventors
  • LAND, Ingmar Rudiger
  • LECHNER, Gottfried
  • GRANT, Alexander James
  • HALEY, David Victor Lawrie
Agents
  • MADDERNS
Priority Data
201290558820.12.2012AU
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIGITAL COMMUNICATION SYSTEM
(FR) SYSTÈME DE COMMUNICATION NUMÉRIQUE
Abstract
(EN)
Methods and apparatus for use in communication systems using recursive modulation schemes with a Low Density Generator Matrix code (including an irregular repeat accumulate (IRA) code) are described that have reduced complexity and thus reduced cost compared to prior art systems. A communication system is described in which the transmitter concatenates a low density generator matrix code with an accumulator followed by a recursive modulator in order to eliminate the use of an interleaver, and in which the receiver combines the decoder for the accumulator and the soft demodulator into a single joint decoder in order reduce the number of components and complexity. Another variation is also described in which the transmitter is further simplified by eliminated the accumulator altogether, and in which the receiver is further simplified by replacing the joint decoder with a soft demodulator prior to the LDGM soft decoder.
(FR)
La présente invention concerne des procédés et un appareil destinés à une utilisation dans des systèmes de communication utilisant des systèmes de modulation récursive à code de matrice de générateur à faible densité (LDGM) (notamment un code irrégulier à répétition-accumulation (IRA)), lesdits procédés et appareil présentant une complexité et, par conséquent, un coût réduits par rapport aux systèmes de l'art antérieur. La présente invention concerne un système de communication dans lequel l'émetteur concatène un code de matrice de générateur à faible densité avec un accumulateur suivi d'un modulateur récursif afin de mettre fin à l'utilisation d'un entrelaceur, et dans lequel le récepteur combine les décodeurs destinés à l'accumulateur et au démodulateur programmable en un seul décodeur combiné afin de réduire le nombre de composants et la complexité. La présente invention concerne également une variante dans laquelle l'émetteur est rendu plus simple encore en supprimant totalement l'accumulateur et dans laquelle le récepteur est rendu plus simple encore en remplaçant le décodeur combiné par un démodulateur programmable monté avant le décodeur programmable LDGM.
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