JP6633262B1 - 光伝送装置および尤度生成回路 - Google Patents
光伝送装置および尤度生成回路 Download PDFInfo
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- H—ELECTRICITY
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- 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
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
- H03M13/255—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with Low Density Parity Check [LDPC] codes
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- H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
- H03M13/45—Soft decoding, i.e. using symbol reliability information
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/612—Coherent receivers for optical signals modulated with a format different from binary or higher-order PSK [X-PSK], e.g. QAM, DPSK, FSK, MSK, ASK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
- H04L1/0058—Block-coded modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
- H04L1/0066—Parallel concatenated codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
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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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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
Description
デジタルコヒーレント技術の出現により、光通信システムにおいては、1チャネル単位あたりの伝送容量が1Tbpsを超えた大容量化が進められている。その結果、信号処理を行なうデジタル回路の回路規模は、LSI(Large Scale Integration)集積化の限界にまで近づいている。
図1は、本発明の実施の形態1に係る128QAM尤度生成回路の構成図である。誤り訂正符号化部11から出力された符号化ビットに応じて、シンボルマッピング部12は、位相平面上での座標を決めて、マッピングされた信号を送信する。
Claims (2)
- 受信信号を位相平面上のI軸成分の信号、Q軸成分の信号、および前記I軸成分の信号と前記Q軸成分の信号とを連接した信号に変換するシンボルデマッピング部と、
前記シンボルデマッピング部により変換された前記I軸成分の信号、前記Q軸成分の信号、および前記I軸成分の信号と前記Q軸成分の信号とを連接した信号に基づいて前記受信信号に関する尤度を生成する尤度生成回路と、
前記尤度生成回路により生成された前記尤度を基に前記受信信号に対する軟判定復号を実施する誤り訂正復号部と
を備え、
前記尤度生成回路は、
前記I軸成分の信号を引数として、第1の尤度を出力する第1の1次元変調用ルックアップテーブルと、
前記Q軸成分の信号を引数として、第2の尤度を出力する第2の1次元変調用ルックアップテーブルと、
前記I軸成分の信号と前記Q軸成分の信号とを連接した信号を引数として、第3の尤度を生成する2次元変調用ルックアップテーブルと
を有し、
前記誤り訂正復号部は、前記第1の尤度、前記第2の尤度、および前記第3の尤度を元に前記軟判定復号を実施し、
低次の矩形QAMに対する尤度生成には、前記第1の1次元変調用ルックアップテーブルおよび前記第2の1次元変調用ルックアップテーブルを使用し、
低次の非矩形QAMに対する尤度生成には、前記2次元変調用ルックアップテーブルを使用し、
高次の非矩形QAMに対する尤度生成には、前記第1の1次元変調用ルックアップテーブル、前記第2の1次元変調用ルックアップテーブル、および前記2次元変調用ルックアップテーブルを共用化して使用する
光伝送装置。 - 受信信号を位相平面上の信号に変換した信号のうち、I軸成分の信号を引数として、第1の尤度を出力する第1の1次元変調用ルックアップテーブルと、
前記受信信号を前記位相平面上の信号に変換した信号のうち、Q軸成分の信号を引数として、第2の尤度を出力する第2の1次元変調用ルックアップテーブルと、
前記受信信号を前記位相平面上の信号に変換した信号のうち、前記I軸成分の信号と前記Q軸成分の信号とを連接した信号を引数として、第3の尤度を生成する2次元変調用ルックアップテーブルと
を有し、
低次の矩形QAMに対する尤度生成には、前記第1の1次元変調用ルックアップテーブルおよび前記第2の1次元変調用ルックアップテーブルを使用し、
低次の非矩形QAMに対する尤度生成には、前記2次元変調用ルックアップテーブルを使用し、
高次の非矩形QAMに対する尤度生成には、前記第1の1次元変調用ルックアップテーブル、前記第2の1次元変調用ルックアップテーブル、および前記2次元変調用ルックアップテーブルを共用化して使用する
尤度生成回路。
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PCT/JP2019/009621 WO2020183555A1 (ja) | 2019-03-11 | 2019-03-11 | 光伝送装置および尤度生成回路 |
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JP6633262B1 true JP6633262B1 (ja) | 2020-01-22 |
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US (1) | US11736127B2 (ja) |
EP (1) | EP3926836B1 (ja) |
JP (1) | JP6633262B1 (ja) |
CN (1) | CN113519126A (ja) |
WO (1) | WO2020183555A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007135193A (ja) * | 2005-11-07 | 2007-05-31 | Korea Electronics Telecommun | 階層的変調信号の独立的ストリーム抽出及び軟判定装置並びにその方法 |
US20120307942A1 (en) * | 2011-05-30 | 2012-12-06 | Bae Ki Taek | Apparatus and method for soft demapping |
WO2014174862A1 (ja) * | 2013-04-23 | 2014-10-30 | 日本電気株式会社 | 復調装置、復調方法および記録媒体 |
WO2015137049A1 (ja) * | 2014-03-13 | 2015-09-17 | 三菱電機株式会社 | 尤度生成装置およびその方法 |
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US8675771B2 (en) | 2006-09-29 | 2014-03-18 | Nec Corporation | Log likelihood ratio arithmetic circuit, transmission apparatus, log likelihood ratio arithmetic method, and program |
WO2015125341A1 (ja) * | 2014-02-24 | 2015-08-27 | 三菱電機株式会社 | 軟判定値生成装置及び軟判定値生成方法 |
JPWO2017158725A1 (ja) * | 2016-03-15 | 2019-01-17 | 三菱電機株式会社 | 対数尤度比算出回路、受信装置および対数尤度比算出方法 |
CN109314530B (zh) * | 2016-06-21 | 2022-07-05 | 日本电信电话株式会社 | 光接收机、光传输装置和光接收机用的方法 |
CN109644010B (zh) * | 2016-09-01 | 2022-12-20 | 三菱电机株式会社 | 似然度生成装置、接收装置、似然度生成方法以及光传输系统 |
-
2019
- 2019-03-11 JP JP2019541813A patent/JP6633262B1/ja active Active
- 2019-03-11 CN CN201980093476.5A patent/CN113519126A/zh active Pending
- 2019-03-11 WO PCT/JP2019/009621 patent/WO2020183555A1/ja unknown
- 2019-03-11 EP EP19919078.6A patent/EP3926836B1/en active Active
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2021
- 2021-08-18 US US17/405,461 patent/US11736127B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007135193A (ja) * | 2005-11-07 | 2007-05-31 | Korea Electronics Telecommun | 階層的変調信号の独立的ストリーム抽出及び軟判定装置並びにその方法 |
US20120307942A1 (en) * | 2011-05-30 | 2012-12-06 | Bae Ki Taek | Apparatus and method for soft demapping |
WO2014174862A1 (ja) * | 2013-04-23 | 2014-10-30 | 日本電気株式会社 | 復調装置、復調方法および記録媒体 |
WO2015137049A1 (ja) * | 2014-03-13 | 2015-09-17 | 三菱電機株式会社 | 尤度生成装置およびその方法 |
Non-Patent Citations (1)
Title |
---|
土肥 慶亮 他: "軟判定誤り訂正を考慮した多値QAMにおける量子化の影響", 電子情報通信学会技術研究報告, vol. 116, no. 112, JPN6019014081, June 2016 (2016-06-01), JP, pages 43 - 48, ISSN: 0004107738 * |
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Publication number | Publication date |
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US11736127B2 (en) | 2023-08-22 |
EP3926836A1 (en) | 2021-12-22 |
WO2020183555A1 (ja) | 2020-09-17 |
CN113519126A (zh) | 2021-10-19 |
EP3926836B1 (en) | 2023-01-18 |
US20210384921A1 (en) | 2021-12-09 |
JPWO2020183555A1 (ja) | 2021-03-18 |
EP3926836A4 (en) | 2022-03-02 |
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