JP2008199623A - メッセージパッシングおよび強制収斂復号法 - Google Patents
メッセージパッシングおよび強制収斂復号法 Download PDFInfo
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- JP2008199623A JP2008199623A JP2008030985A JP2008030985A JP2008199623A JP 2008199623 A JP2008199623 A JP 2008199623A JP 2008030985 A JP2008030985 A JP 2008030985A JP 2008030985 A JP2008030985 A JP 2008030985A JP 2008199623 A JP2008199623 A JP 2008199623A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, 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
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1148—Structural properties of the code parity-check or generator matrix
- H03M13/116—Quasi-cyclic LDPC [QC-LDPC] codes, i.e. the parity-check matrix being composed of permutation or circulant sub-matrices
- H03M13/1165—QC-LDPC codes as defined for the digital video broadcasting [DVB] specifications, e.g. DVB-Satellite [DVB-S2]
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, 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
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1105—Decoding
- H03M13/1111—Soft-decision decoding, e.g. by means of message passing or belief propagation algorithms
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, 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
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1105—Decoding
- H03M13/1111—Soft-decision decoding, e.g. by means of message passing or belief propagation algorithms
- H03M13/1117—Soft-decision decoding, e.g. by means of message passing or belief propagation algorithms using approximations for check node processing, e.g. an outgoing message is depending on the signs and the minimum over the magnitudes of all incoming messages according to the min-sum rule
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, 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
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1105—Decoding
- H03M13/1111—Soft-decision decoding, e.g. by means of message passing or belief propagation algorithms
- H03M13/1117—Soft-decision decoding, e.g. by means of message passing or belief propagation algorithms using approximations for check node processing, e.g. an outgoing message is depending on the signs and the minimum over the magnitudes of all incoming messages according to the min-sum rule
- H03M13/112—Soft-decision decoding, e.g. by means of message passing or belief propagation algorithms using approximations for check node processing, e.g. an outgoing message is depending on the signs and the minimum over the magnitudes of all incoming messages according to the min-sum rule with correction functions for the min-sum rule, e.g. using an offset or a scaling factor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, 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
- H03M13/65—Purpose and implementation aspects
- H03M13/6577—Representation or format of variables, register sizes or word-lengths and quantization
- H03M13/658—Scaling by multiplication or division
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- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Multimedia (AREA)
- Error Detection And Correction (AREA)
Abstract
【解決手段】構成上含む可変ノードと制御ノードの各対について、複数の復号反復の各反復において前の反復における送信外部情報(αmn)と比較して、前記可変ノードが前記制御ノードへメッセージとして送信することを意図する外部情報(αtemp mn)の符号に変化を検出し、符号変化がある場合に前記外部情報を振幅削減演算(Fred)に委ね、その後前記外部情報を制御ノードに送信する。
【選択図】図3
Description
−直列タイプのスケジューリングであり、「直列スケジューリング」、「シャッフルBP」、「水平シャッフル」または「垂直シャッフル」として示すスケジューリングタイプを配置することができる範疇である。直列タイプのスケジューリングは制御ノードおよび可変ノード双方に適用することができる。制御ノードに適用する場合、復号には以下の方策を使用する:
・可変ノードn∈H(m)宛てのメッセージβmnを計算することにより、単一の制御ノードmをまず処理する;
・各可変ノードn∈H(m)から制御ノードm’∈H(n)−{m}宛てのメッセージαm’nを更新し、送信する。これら同じ可変ノードに関する事後情報
・次制御ノードを処理し、制御ノードがなくなるまで前の2つのステップを反復する。
・可変ノードn∈H(mi)宛てのメッセージβmin、i=1、、、gを計算することにより、制御ノード{m1、m2、、、mg}を含む第1のグループGを処理し;
・各可変ノードn∈H(mi)、i=1、、、gからそれぞれ制御ノードm’∈H(n)−{mi}宛てのメッセージαm’nを更新し、送信する。これら同じ可変ノードに関する事後情報
・次制御ノードグループを処理し、制御ノードグループがなくなるまで前の2つのステップを反復する。
Algorithm(積和アルゴリズム)」および「基部を持つBP]としてさらに既知の「最小和」アルゴリズムである。これら2つのアルゴリズムに関する詳細な記述は記録システムのための符号化および信号処理CRCハンドブックにおいて公開のW.E.ライアン(W.E.Ryan)著「LDPC符号入門」と題する文献に見られ、リンクWWW.CSEE.WVU.edu/wcrl/1dpc.htm.から入手可能であろう。
m 制御ノード
N 符号長
n 可変ノード
Claims (13)
- 請求項1に記載の復号法において、前記振幅削減演算が非線形演算であることを特徴とする復号法。
- 請求項3に記載の復号法において、前記閾値を適応的に計算することを特徴とする復号法。
- 請求項4に記載の復号法において、前記前の反復における前記可変ノードから前記制御ノードへの前記送信外部情報の前記絶対値として、前記閾値を入手することを特徴とする復号法。
- 請求項3に記載の復号法において、前記前の反復における前記可変ノードから前記制御ノードへの前記送信外部情報の前記絶対値の最小値として、前記閾値を入手することを特徴とする復号法。
- 請求項1に記載の復号法において、前記振幅削減演算が線形演算であることを特徴とする復号法。
- 請求項7に記載の復号法において、前記振幅削減演算が、厳密に正であり、厳密に1より小さい係数による乗算であることを特徴とする復号法。
- 請求項8に記載の復号法において、前記係数を適応的に計算することを特徴とする復号法。
- 請求項3乃至請求項6のいずれかに記載の復号法において、厳密に正であり、厳密に1より小さい係数によりそのように処理する前記外部情報の乗算が前記外部情報に限界を設ける前記演算に続くことを特徴とする復号法。
- ソフトウェア手段を含むコンピュータプログラムであって、ソフトウェア手段がコンピュータにおいて動作する場合に前記請求項の1つに記載の前記復号法における前記ステップを実装するようにするソフトウェア手段を含むコンピュータプログラム。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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FR0753228A FR2912574B1 (fr) | 2007-02-13 | 2007-02-13 | Procede de decodage a passage de messages et a convergence forcee. |
Publications (1)
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JP2008199623A true JP2008199623A (ja) | 2008-08-28 |
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JP2008030985A Pending JP2008199623A (ja) | 2007-02-13 | 2008-02-12 | メッセージパッシングおよび強制収斂復号法 |
Country Status (4)
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US (1) | US8468436B2 (ja) |
EP (1) | EP1959572B1 (ja) |
JP (1) | JP2008199623A (ja) |
FR (1) | FR2912574B1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US8099645B2 (en) * | 2008-04-11 | 2012-01-17 | Nec Laboratories America, Inc. | LDPC codes and stochastic decoding for optical transmission |
US8890862B2 (en) * | 2011-03-14 | 2014-11-18 | Ecole Centrale Paris | Method and device for efficient parallel message computation for map inference |
FR3009462B1 (fr) | 2013-08-02 | 2019-08-23 | Thales | Procede ameliore de decodage d'un code correcteur avec passage de message, en particulier pour le decodage de codes ldpc ou codes turbo |
WO2015137575A1 (ko) * | 2014-03-13 | 2015-09-17 | 엘지전자 주식회사 | 무선 통신 시스템에서의 순방향 에러 정정을 위한 저밀도 패리티 체크 코드의 디코딩 방법 및 장치 |
KR102461276B1 (ko) * | 2016-03-10 | 2022-10-31 | 삼성전자주식회사 | 저밀도 패리티 검사 코드를 지원하는 통신 시스템에서 신호를 수신하는 장치 및 방법 |
KR102568716B1 (ko) | 2016-08-02 | 2023-08-21 | 삼성전자주식회사 | Ldpc 코드의 디코딩을 위한 장치 및 방법 |
CN110830050B (zh) * | 2019-11-27 | 2023-09-29 | 武汉虹旭信息技术有限责任公司 | 一种ldpc译码方法、系统、电子设备及存储介质 |
CN117451113B (zh) * | 2023-12-22 | 2024-03-26 | 中国电建集团华东勘测设计研究院有限公司 | 基于光纤传感的自升式平台桩腿结构健康监测系统 |
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JP2004186940A (ja) * | 2002-12-03 | 2004-07-02 | Nec Corp | 誤り訂正符号復号装置 |
JP2006060695A (ja) * | 2004-08-23 | 2006-03-02 | Science Univ Of Tokyo | 情報復号方法、情報符号化方法、情報通信方法、情報復号装置、送信装置及び情報通信システム |
WO2006123543A1 (en) * | 2005-05-20 | 2006-11-23 | Mitsubishi Denki Kabushiki Kaisha | Normalized belief propagation decoding |
JP2007013519A (ja) * | 2005-06-30 | 2007-01-18 | Nec Electronics Corp | 復号装置と方法並びにプログラム |
WO2007007801A1 (ja) * | 2005-07-13 | 2007-01-18 | Mitsubishi Electric Corporation | 通信装置および復号方法 |
JP2007013518A (ja) * | 2005-06-30 | 2007-01-18 | Nec Electronics Corp | 復号装置と方法並びにプログラム |
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US3835243A (en) * | 1972-04-07 | 1974-09-10 | Matsushita Electric Ind Co Ltd | Circuitry for reducing effects of noise on color image |
US7401283B2 (en) * | 2004-09-28 | 2008-07-15 | Broadcom Corporation | Amplifying magnitude metric of received signals during iterative decoding of LDPC (Low Density Parity Check) code and LDPC coded modulation |
US7295153B2 (en) * | 2004-09-29 | 2007-11-13 | Lockheed Martin Corporation | Acousto-radio frequency modulator and applications therefore |
EP1849236A1 (en) * | 2004-12-29 | 2007-10-31 | Intel Corporation | Channel estimation and fixed thresholds for multi-threshold decoding of low-density parity check codes |
US7333279B2 (en) * | 2005-03-22 | 2008-02-19 | Seagate Technology Llc | System and method for drive-side guarantee of quality of service and for extending the lifetime of storage devices |
US7607075B2 (en) * | 2006-07-17 | 2009-10-20 | Motorola, Inc. | Method and apparatus for encoding and decoding data |
US8337379B2 (en) * | 2006-08-17 | 2012-12-25 | Terumo Bct, Inc. | Blood processing apparatus with robust automated process control |
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2007
- 2007-02-13 FR FR0753228A patent/FR2912574B1/fr not_active Expired - Fee Related
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2008
- 2008-01-24 EP EP08100852.6A patent/EP1959572B1/fr active Active
- 2008-02-11 US US12/069,601 patent/US8468436B2/en active Active
- 2008-02-12 JP JP2008030985A patent/JP2008199623A/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2004186940A (ja) * | 2002-12-03 | 2004-07-02 | Nec Corp | 誤り訂正符号復号装置 |
JP2006060695A (ja) * | 2004-08-23 | 2006-03-02 | Science Univ Of Tokyo | 情報復号方法、情報符号化方法、情報通信方法、情報復号装置、送信装置及び情報通信システム |
WO2006123543A1 (en) * | 2005-05-20 | 2006-11-23 | Mitsubishi Denki Kabushiki Kaisha | Normalized belief propagation decoding |
JP2007013519A (ja) * | 2005-06-30 | 2007-01-18 | Nec Electronics Corp | 復号装置と方法並びにプログラム |
JP2007013518A (ja) * | 2005-06-30 | 2007-01-18 | Nec Electronics Corp | 復号装置と方法並びにプログラム |
WO2007007801A1 (ja) * | 2005-07-13 | 2007-01-18 | Mitsubishi Electric Corporation | 通信装置および復号方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1959572B1 (fr) | 2018-08-15 |
EP1959572A2 (fr) | 2008-08-20 |
FR2912574A1 (fr) | 2008-08-15 |
FR2912574B1 (fr) | 2010-09-17 |
US20080195898A1 (en) | 2008-08-14 |
EP1959572A3 (fr) | 2014-09-10 |
US8468436B2 (en) | 2013-06-18 |
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