JP2012525661A - 読み取りデータ処理システムにおける動的スケーリングのシステムと方法 - Google Patents
読み取りデータ処理システムにおける動的スケーリングのシステムと方法 Download PDFInfo
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Abstract
Description
本発明の種々の実施例の更なる理解は、図を参照した次の記述で具体的に理解されよう。図において、同じ参照符号が幾つかの図面を通して類似な構成要素に用いられる。例として、複数の類似的な要素の1つを示すため、参照数字の下位はサブラベルである。参照がサブラベルなしであると、それは全ての複数の類似な構成要素を参照している。
1つの利点として、その手法(アプローチ)は飽和を減少させるために用いられ得、そしてそれにより復号/検出回路が所望の結果に収斂する確率を増加させる。飽和は、最大に等しいかそれを越える復号器回路により与えられるソフトデシジョンの数である。
はスケーリング因子303と307の増分的修正を記述する。
データ検出処理の結果は挿間され(ブロック535)、そして挿間化データは復号される(ブロック540)。この点で、データ検出と復号処理が収斂に失敗して(ブロック545)そしてくり返されるべきか、又は結果が収斂し(ブロック545)そして報告されるべきかが決定される。
β スケーリング因子=βmaximum ; 及び
α スケーリング因子=αminimum
そうでなく、更新が要求されていない場合(ブロック701,703)、スケーリング因子は次の式に従ってデフォルトレベル(ブロック705)に設定される。
β スケーリング因子=βdefault ; 及び
α スケーリング因子=αdefault
β スケーリング因子=β(i);及び
α スケーリング因子=α(i)
β(i+1)はβ(i)より大きくそしてα(i+1)はα(i)より小さい。そうでなく、更新が求められていない場合(ブロック711,713)、スケーリング因子は次の式によりデフォルト値に設定される(ブロック715)。
β スケーリング因子=βdefault ; 及び
α スケーリング因子=αdefault
βスケーリング因子=β(index) ; 及び
αスケーリング因子=α(index)
β(i+1)はβ(i)より大きくそしてα(i+1)はα(i)より小さい。そうでなく、更新が要求されていない場合(ブロック721,723)、スケーリング因子は次の式によりデフォルトレベルに設定される(ブロック725)。
βスケーリング因子=βdefault ;及び
αスケーリング因子=αdefault
βスケーリング因子=βdefault ;及び
αスケーリング因子=αdefault
Claims (20)
- データ処理システムにおいて、
復号化出力を与える復号器回路;
該復号化出力の少なくとも一部に基いて、第1の動的スケーリング値と第2の動的スケーリング値を決定する動的スカラー計算回路;
該第1の動的スケーリング値により該復号化出力を乗算して第1のスケール化出力を与える第1の乗算器回路;
該第1のスケール化出力を受信して検出出力を与える検出器回路;及び
該第2の動的スケーリング値により該検出出力を乗算して第2のスケール化出力を与える第2の乗算器回路からなるデータ処理システム。 - 請求項1に記載のデータ処理システムにおいて、動的スカラー計算回路は復号化出力における飽和出力の数を決定しているデータ処理システム。
- 請求項2に記載のデータ処理システムにおいて、該第1の動的スケーリング値は飽和出力の数が閾値を越えたときに第1のデフォルト値に設定され;該第1の動的スケーリング値は飽和出力の数が閾値より小さいときに最小値に設定され;該第2の動的スケーリング値は飽和出力が閾値を越えたときに第2のデフォルト値に設定され;そして該第2の動的スケーリング値は飽和出力の数が閾値より小さいときに最大値に設定されているデータ処理システム。
- 請求項2に記載のデータ処理システムにおいて、閾値を越える飽和出力の数を有することとは境界条件外であり;境界条件外の連続数に対応するインデックスが決定され;該第1の動的スケーリング値は該インデックスに対応する第1のスカラー値に設定され;そして該第2の動的スケーリング値は該インデックスに対応する第2のスカラー値に設定されるデータ処理システム。
- 請求項4に記載のデータ処理システムにおいて、該第1のスカラー値と第2のスカラー値はルックアップ表に維持され、そして該インデックスが該ルックアップ表へのポインタであるデータ処理システム。
- 請求項2に記載のデータ処理システムにおいて、飽和出力の数に対応するインデックスが決定され;該第1の動的スケーリング値は該インデックスに対応する第1のスカラー値に設定され;そして該第2の動的スケーリング値は該インデックスに対応する第2のスカラー値に設定されるデータ処理システム。
- 請求項6に記載のデータ処理システムにおいて、該第1のスカラー値と第2のスカラー値はルックアップ表に維持され、そして該インデックスが該ルックアップ表へのポインタであるデータ処理システム。
- 請求項1に記載のデータ処理システムにおいて、該動的スカラー計算回路は該復号化出力に現われる違反チェックの数を決定するデータ処理システム。
- 請求項8に記載のデータ処理システムにおいて、該第1の動的スケーリング値は違反チェックの数が第1の閾値より小さいときに第1のデフォルト値に設定され;該第1の動的スケーリング値は違反チェックの数が第1の閾値より多いときに最小値に設定され;該第2の動的スケーリング値は違反チェックの数が第2の閾値より小さいときに第2のデフォルト値に設定され;そして該第2の動的スケーリング値は違反チェックの数が第2の閾値より多いときに最大値に設定するデータ処理システム。
- 請求項9に記載のデータ処理システムにおいて、閾値より小さい数の違反チェックを有することは境界条件外であり;境界条件外の連続する数に対応するインデックスが決定され;該第1の動的スケーリング値は該インデックスに対応する第1のスカラー値に設定され;そして該第2の動的スケーリング値は該インデックスに対応する第2のスカラー値に設定されるデータ処理システム。
- 請求項10に記載のデータ処理システムにおいて、該第1のスカラー値と第2のスカラー値はルックアップ表に維持され;そして該インデックスは該ルックアップ表へのポインタであるデータ処理システム。
- データ処理方法において、
復号器回路が第1の入力を受信して復号化出力を与え;
検出器回路が第2の入力を受信して検出化出力を与え;
該復号化出力の少なくとも一部に基いて第1のスケーリング値と第2のスケーリング値を動的に決定し;
該第1のスケーリング値により該復号化出力を乗算して該第2の入力を生成し、そして
該第2のスケーリング値により該検出化出力を乗算して積出力を生成しているデータ処理方法。 - 請求項12に記載のデータ処理方法において、該第1のスケーリング値と第2のスケーリング値の動的な決定は、復号化出力における飽和出力の数を決定することを含むデータ処理方法。
- 請求項13に記載のデータ処理方法において、該第1の動的スケーリング値は飽和出力の数が閾値を越えたときに第1のデフォルト値に設定され;該第1の動的スケーリング値は該飽和出力が該閾値より小さいときに最小値に設定され、該第2の動的スケーリング値は飽和出力が該閾値を越えたときに第2のデフォルト値に設定され;そして該第2の動的スケーリング値が該飽和出力が該閾値より小さいときに最大値に設定されているデータ処理方法。
- 請求項13に記載のデータ処理方法において、閾値を越える数の飽和出力を有することは境界条件外であり;境界条件外の連続数に対応するインデックスが決定され;該第1の動的スケーリング値が該インデックスに対応する第1のスカラー値に設定され;そして該第2の動的スケーリング値が該インデックスに対応する第2のスカラー値に設定されるデータ処理方法。
- 請求項12に記載のデータ処理において、該第1のスケーリング値と第2のスケーリング値の動的決定は、該復号化出力において現われる違反チェックの数を決定することを含むデータ処理方法。
- 請求項16に記載のデータ処理方法において、該第1の動的スケーリング値は違反チェックの数が第1の閾値より小さいときに第1のデフォルト値に設定され;該第1の動的スケーリング値は違反チェックの数が該第1の閾値より大きいときに最小値に設定され;該第2の動的スケーリング値は違反チェックの数が第2の閾値より小さいときに第2のデフォルト値に設定され;そして該第2の動的スケーリング値は違反チェックの数が該第2の閾値より大きいときに最大値に設定されるデータ処理方法。
- 請求項16に記載のデータ処理方法において、閾値より小さい数の違反チェックを有することは境界条件外であり;境界条件外の連続数に対応するインデックスが決定され;該第1の動的スケーリング値は該インデックスに対応する第1のスカラー値に設定され;そして該第2の動的スケーリング値は該インデックスに対応する第2のスカラー地に設定されるデータ処理方法。
- ディスク駆動システムにおいて、
蓄積媒体;及び
該蓄積媒体から導かれたデータを受信する読出しチャネル装置とからなり、該読出しチャネル装置は:
復号化出力を与える復号器回路;
該復号化出力の少なくとも一部に依存して第1の動的スケーリング値と第2の動的スケーリング値とを決定する動的スカラー計算回路;
該第1の動的スケーリング値により該復号化出力を乗算して第1のスケール化出力を与える第1の乗算器回路;
該第1のスケール化出力を受信して検出出力を与える検出器回路;及び
該第2の動的スケーリングの値により該検出出力を乗算して第2のスケール化出力を与える第2の乗算器回路とからなるものであるディスク駆動システム。 - 請求項1に記載のデータ処理システムにおいて、該動的スカラー計算回路は該復号化出力における飽和出力の数を決定し、そして該動的スカラー計算回路が該復号化出力に現れる違反チェックの数を決定しているデータ処理システム。
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TW201039568A (en) | 2010-11-01 |
KR20120012960A (ko) | 2012-02-13 |
EP2425430A1 (en) | 2012-03-07 |
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CN102265345B (zh) | 2015-11-25 |
TWI495272B (zh) | 2015-08-01 |
US20120033320A1 (en) | 2012-02-09 |
CN102265345A (zh) | 2011-11-30 |
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