JP2001503588A - 畳み込み符号化された符号語を復号化するためのソフト判定出力 - Google Patents
畳み込み符号化された符号語を復号化するためのソフト判定出力Info
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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
- H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
- H03M13/41—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
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- H—ELECTRICITY
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Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.ブロック長Tを有する格子で表現される出力を出力する符号化器によって出 力された信号のシーケンスをチャネルに送信するシステムにおいて、 前記格子を介して前進反復の間に前記チャネルに受信された信号の前記シーケ ンスをビタビ復号化し、長さ2Lのウィンドウに、各時間間隔で各状態に対して 複数の前進反復状態メトリクスαを供給する第1の手段と、 前記格子を介して後進反復の間に前記チャネルに受信された信号の前記シーケ ンスをビタビ復号化し、第2の時間で介する各時間間隔での各状態に対する複数 の後進反復状態メトリクスβを供給する第2の手段と 前進状態メトリクスを使用する各状態でデュアルマクシマ計算を実行し、デー タの特別なシーケンスが前記符号化器によって送信された尤度測定を提供するた めに後進状態メトリクスとブランチメトリクスとが同一であるような第3の手段 とを備え、 Lは、制約長であり、2Lはブロック長Tよりも小さく、前記前進反復は初期 状態t0で開始することを特徴とするシステム。 2.請求項1記載の発明において、前記第1の手段は、先の状態s’に対する前 進状態メトリクスαt-1(s’)にブランチメトリクスγt(s’、s)を乗算し て、選択された状態sに対する前記前進状態メトリクスαt(s)を提供する手 段を含むことを特徴とするシステム。 3.請求項2記載の発明において、前記第1の手段は、各先の状態s’に対する 前進状態メトリクスαt-1(s’)とブランチメトリクスγt(s’、s)の積を 、各先の状態s’と選択された状態sとの間で加算して、選択された状態sに対 する前記前進状態メトリクスαt(s)を提供する手段を含むことを特徴とする システム。 4.請求項1記載の発明において、前記第2の手段は、後続状態s’に対する後 進状態メトリクスβt+1(s’)にブランチメトリクスγt(s’、s)を乗算し て、選択された状態sに対する前記後進ブランチメトリクスβt(s)を提供す る手段を含むことを特徴とするシステム。 5.請求項4記栽の発明において、前記第2の手段は、各先の状態s’に対する 後進状態メトリクスβt-1(s’)とブランチメトリクスγt(s’、s)の積を 、各先の状態s’と選択された状態sとの間で加算して、選択された状態sに対 する前記後進ブランチメトリクスβt(s)を提供する手段を含むことを特徴と するシステム。 6.請求項1記載の発明において、デュアルマクシマ計算を実行する前記手段は 、尤度比を計算する手段を含むことを特徴とするシステム。 7.請求項6記載の発明において、前記尤度比を訃算する手段は、尤度比の対数 を計算する手段を含むことを特徴とするシステム。 8.請求項1記載の発明において、前記第3の手段は、データの特別なシーケン スが前記符号化器から送信された尤度の測定の近似としてmax関数を計算する 手段を含むことを特徴とするシステム。 9.請求項8記載の発明において、前記第3の手段は、前記近似に対する修正項 を供給して、データの特別なシーケンスが前記符号化器から送信された尤度のよ り正確な測定を供給する手段を含むことを特徴とするシステム。 10.請求項9記載の発明において、選択状態に対する前記修正項は、前記前進 状態メトリクス、前記後進状態メトリクス及びブランチメトリクスの指数関数を 含むことを特徴とするシステム。 11.請求項1記載の発明において、前記第2の手段は、前記格子を介して第2 の後進反復を提供する手段を含み、前記第2の手段は、第3の時間t3Lで開始す る各時間間隔での各状態に対する第2の複数の後進反復状態メトリクスβを供給 することを特徴とするシステム。 12.送信された符号語のシーケンスを受信する手段と、 符号語の前記シーケンスの復号化のためにブロック長Tを有する格子を用意す る手段と、 前記格子を介して前進反復の間に前記チャネルに受信された信号の前記シーケ ンスをビタビ復号化し、長さ2Lのウィンドウに、各時間間隔で各状態に対して 複数の前進反復状態メトリクスαを供給する第1の手段と、 前記格子を介して後進反復の間に前記チャネルに受信された信号の前記シーケ ンスをビタビ復号化し、第2の時間で介する各時間間隔での各状態に対する複数 の後進反復状態メトリクスβを供給する第2の手段と 後続状態s’に対する後進状態メトリクスβt+1(s’)にブランチメトリク スγt(s’、s)を乗算して、選択された状態sに対する前記後進ブランチメ トリクスβt(s)を提供する手段と、 各先の状態s’に対する後進状態メトリクスβt-1(s’)とブランチメトリ クスγt(s’、s)の積を、各先の状態s’と選択された状態sとの間で加算 して、選択された状態sに対する前記後進ブランチメトリクスβt(s)を提供 する手段と、 前進状態メトリクスを使用する各状態でデュアルマクシマ計算を実行し、デー タの特別なシーケンスが前記符号化器によって送信された尤度測定を提供するた めに後進状態メトリクスとブランチメトリクスとが同一であるような第3の手段 とを備え、 前記第1の手段は、各先の状態s’に対する前進状態メトリクスαt-1(s’ )とブランチメトリクスγt(s’、s)の積を、各先の状態s’と選択された 状態sとの間で加算して、選択された状態sに対する前記前進状態メトリクスαt (s)を提供する手段を含み、 Lは、制約長であり、2Lはブロック長Tよりも小さく、前記前進反復は初期 状態t0で開始することを特徴とするソフト判定出力符号化器。 13.請求項12記載の発明において、デュアルマクシマ計算を実行する前記手 段は、尤度比を計算する手段を含むことを特徴とするソフト判定出力符号化器。 14.請求項13記載の発明において、前記尤度比を計算する手段は、尤度比の 対数を計算する手段を含むことを特徴とするソフト判定出力符号化器。 15.請求項12記載の発明において、前記第3の手段は、データの特別なシー ケンスが前記符号化器から送信された尤度の測定の近似としてmax関数を計算 する手段を含むことを特徴とするソフト判定出力符号化器。 16.請求項15記載の発明において、前記第3の手段は、前記近似に対する修 正項を供給して、データの特別なシーケンスが前記符号化器から送信された尤度 のより正確な測定を供給する手段を含むことを特徴とするソフト判定出力符号化 器。 17.請求項16記載の発明において、選択状態に対する前記修正項は、前記前 進状態メトリクス、前記後進状態メトリクス及びブランチメトリクスの指数関数 を含むことを特徴とするソフト判定出力符号化器。 18.a)符号語を符号化するのに使用される符号化器の出力のブロック長Tを 有する格子代表を提供する工程と、 b)格子を介して前進反復に対する格子のノードを開始するそれぞれに初期条件 を割り当てる工程と、 c)格子を介して後進反復を開始するそれぞれに初期条件を割り当てる工程と、 d)前進反復の間に格子上のブロック長Tよりも小さい長さLのウィンドウ内に おける各ノードに対する前進メトリクスを計算する工程と、 e)後進反復の間に、前進反復が初期化される時点から時間2Lで始まる格子上 の長さLのウィンドウ内の各ノードに対する後進メトリクスを計算する工程と、 f)前記符号語を復号化するために前進メトリクスと後進メトリクスを使用する 各ノードに対するデュアルマクシマを計算する工程と、 g)全てのブロックについてd〜fの工程を繰り返す工程とを備えたことを特徴 とする畳み込み符号化された符号語を復号化する方法。 19.請求項18記載の発明において、工程fがログマッピング(log mapping) の工程を含むことを特徴とする畳み込み符号化された符号語を復号化する方法。 20.請求項18記載の発明において、工程eが、前進反復が初期化された時点 から時間3Lで始まる第2の後進反復を初期化する工程を含むことを特徴とする 畳み込み符号化された符号語を復号化する方法。 21.a)符号語を符号化するのに使用される符号化器の出力のブロック長Tを 有する格子代表を提供する工程と、 b)格子を介して前進反復に対する格子のノードを開始するそれぞれに初期条件 を割り当てる工程と、 c)格子を介して後進反復を開始するそれぞれに初期条件を割り当てる工程と、 d)前進反復の間に格子上のブロック長Tよりも小さい長さLのウィンドウ内に おける各ノードに対する前進メトリクスを計算するためにビタビアルゴリズムを 使用する工程と、 e)後進反復の間に、前進反復が初期化される時点から時間2Lで始まる格子上 の長さLのウィンドウ内の各ノードに対する後進メトリクスを計算するためにビ タビアルゴリズムを使用する工程と、 f)前記符号語を復号化するために前進メトリクスと後進メトリクスを使用する 各ノードに対するデュアルマクシマを計算する工程と、 g)全てのブロックについてd〜fの工程を繰り返す工程とを備えたことを特徴 とする畳み込み符号化された符号語を復号化する方法。 22.請求項21記載の発明において、工程fがログマッピング(log mapping) の工程を含むことを特徴とする畳み込み符号化された符号語を復号化する方法。 23.請求項21の発明において、工程eが、前進反復が初期化された時点から 時間3Lで始まる第2の後進反復を初期化する工程を含むことを特徴とする畳み 込み符号化された符号語を復号化する方法。 24.符号化器によって出力された信号のシーケンスを復号化する復号化器にお いて、 a)前進ビタビ復号化器と、 b)後進ビタビ復号化器と、 c)前進ビタビ復号化器及び後進ビタビ復号化器と結合されたデュアルマクシマ プロセッサを備えたことを特徴とする復号化器。 25.請求項24記載の復号化器において、前記前進ビタビ復号化器に接続され たバッファメモリを更に含むことを特徴とする復号化器。
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US08/743,688 US5933462A (en) | 1996-11-06 | 1996-11-06 | Soft decision output decoder for decoding convolutionally encoded codewords |
US743,688 | 1996-11-06 | ||
PCT/US1997/020109 WO1998020617A1 (en) | 1996-11-06 | 1997-11-06 | Soft decision output decoder for decoding convolutionally encoded codewords |
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US (1) | US5933462A (ja) |
EP (3) | EP2034612A3 (ja) |
JP (1) | JP3998723B2 (ja) |
KR (1) | KR100566084B1 (ja) |
CN (1) | CN1178397C (ja) |
AT (1) | ATE439705T1 (ja) |
AU (1) | AU722477B2 (ja) |
CA (1) | CA2270668C (ja) |
DE (1) | DE69739533D1 (ja) |
ES (1) | ES2330061T3 (ja) |
MY (1) | MY116167A (ja) |
TW (1) | TW431097B (ja) |
WO (1) | WO1998020617A1 (ja) |
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FI102230B (fi) * | 1997-02-28 | 1998-10-30 | Nokia Telecommunications Oy | Vastaanottomenetelmä ja vastaanotin |
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WO2019234903A1 (ja) | 2018-06-08 | 2019-12-12 | 日本電気株式会社 | 復号装置、復号方法、及び非一時的なコンピュータ可読媒体 |
CN115882873B (zh) * | 2023-02-23 | 2023-05-23 | 成都星联芯通科技有限公司 | 低密度奇偶校验码译码方法、装置、通信设备及存储介质 |
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JPH05207075A (ja) * | 1992-01-24 | 1993-08-13 | Hitachi Ltd | ディジタル通信システム |
US5442627A (en) * | 1993-06-24 | 1995-08-15 | Qualcomm Incorporated | Noncoherent receiver employing a dual-maxima metric generation process |
US5583889A (en) * | 1994-07-08 | 1996-12-10 | Zenith Electronics Corporation | Trellis coded modulation system for HDTV |
US5629958A (en) * | 1994-07-08 | 1997-05-13 | Zenith Electronics Corporation | Data frame structure and synchronization system for digital television signal |
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WO1998020617A1 (en) | 1998-05-14 |
KR20000053091A (ko) | 2000-08-25 |
DE69739533D1 (de) | 2009-09-24 |
KR100566084B1 (ko) | 2006-03-30 |
CN1178397C (zh) | 2004-12-01 |
EP0937336A1 (en) | 1999-08-25 |
EP1388945A3 (en) | 2004-06-09 |
TW431097B (en) | 2001-04-21 |
AU722477B2 (en) | 2000-08-03 |
AU5104598A (en) | 1998-05-29 |
EP2034612A2 (en) | 2009-03-11 |
ES2330061T3 (es) | 2009-12-03 |
JP3998723B2 (ja) | 2007-10-31 |
MY116167A (en) | 2003-11-28 |
EP2034612A3 (en) | 2010-06-02 |
EP1388945A2 (en) | 2004-02-11 |
CA2270668C (en) | 2006-06-13 |
ATE439705T1 (de) | 2009-08-15 |
ZA979958B (en) | 1998-05-25 |
EP0937336B1 (en) | 2009-08-12 |
CA2270668A1 (en) | 1998-05-14 |
US5933462A (en) | 1999-08-03 |
CN1236507A (zh) | 1999-11-24 |
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