JP2014027704A - 複数のチェックノード・アルゴリズムを用いる誤り訂正デコーダ - Google Patents
複数のチェックノード・アルゴリズムを用いる誤り訂正デコーダ Download PDFInfo
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Abstract
【解決手段】LDPCデコーダは、コントローラと、CNUとを有する。CNUは、スケーリングmin−sumアルゴリズム、オフセットmin−sumアルゴリズム、またはスケーリングおよびオフセットmin−sumアルゴリズムを用いて、チェックノード・メッセージを発生する。最初にコントローラは、スケールファクタとオフセット値を選択する。スケールファクタはスケーリングなしの場合に1に、オフセット値はオフセットなしの場合にゼロに設定することができる。デコーダが符号語を正しく復号できない場合は、(i)コントローラは、新しいスケーリングおよび/またはオフセット値を選択し、(ii)デコーダは、新しいスケーリングおよび/またはオフセット値を用いて、符号語を正しく復号するように試みる。
【選択図】図3
Description
本出願は、2008年8月15日に出願した米国仮出願第61/089,297号(整理番号08−0241)の出願日の利益を主張するものであり、それらのすべての教示はそれらの全体が参照により本明細書に組み込まれる。
R(i) mnを発生する。したがって図2の実施形態では、各Rメッセージは、N(m)/n=9(すなわち、wr−1=10−1)個のQメッセージに基づいて発生される。式(2)および(3)において、第1の反復の場合は、ソフト値メモリ202から受け取ったソフト値Ln (0)が、前の反復に対するQメッセージの代わりに用いられることに留意されたい(すなわち、Q(0) n’m=L(0) n’m)。
Claims (11)
- 正しい符号語を復元するように誤り訂正(EC)符号化された符号語を復号するECデコーダを備える装置であって、
前記デコーダは、上位プロセッサによって発生された初期値の初期セットに基づいて、メッセージの第1のセットを発生するように適合され、
前記初期セットは、前記EC符号化された符号語に対応し、
前記初期セット内の各初期値は、前記EC符号化された符号語の異なるビットに対応し、
前記デコーダは、
スケールファクタおよびオフセット値に基づいて、メッセージの前記第1のセットをスケーリングおよびオフセットされたメッセージに変換するように適合された1つまたは複数のブロックと、
前記スケールファクタおよび前記オフセット値を選択するように適合されたコントローラとを備え、
前記コントローラは、(i)初期スケールファクタおよび初期オフセット値を選択し、かつ(ii)その後に前記初期スケールファクタおよび前記初期オフセット値の少なくとも1つを変更するように適合され、
前記ECデコーダがトラッピング・セットに直面したことを前記コントローラが判断した後、前記コントローラは、前記初期スケールファクタおよび前記初期オフセット値の少なくとも1つを変更する、
装置。 - 前記ECデコーダは、変数ノード・メッセージを発生するように適合された変数ノードユニットを備え、
メッセージの前記第1のセットは、前記変数ノード・メッセージであり、
前記1つまたは複数のブロック(たとえば、310)は、前記スケールファクタおよび前記オフセット値に基づいて、前記変数ノード・メッセージをスケーリングおよびオフセットされた変数ノード・メッセージに変換するように適合された、請求項1に記載の装置。 - 前記ECデコーダは、チェックノード・メッセージを発生するように適合されたチェックノード・ユニットを備え、
メッセージの前記第1のセットは、前記チェックノード・メッセージであり、
前記1つまたは複数のブロック(たとえば、346)は、前記スケールファクタおよび前記オフセット値に基づいて、前記チェックノード・メッセージをスケーリングおよびオフセットされたチェックノード・メッセージに変換するように適合された、請求項1に記載の装置。 - 前記ECデコーダは、min−sumアルゴリズムを実装し、
前記ECデコーダは、min−sumアルゴリズムの第1の最小および第2の最小絶対値を発生するように適合されたチェックノード・ユニットを備え、
メッセージの前記第1のセットは、前記第1の最小および第2の最小絶対値であり、
前記1つまたは複数のブロック(たとえば、334)は、前記スケールファクタおよび前記オフセット値に基づいて、前記第1の最小および第2の最小絶対値をスケーリングおよびオフセットされた第1の最小および第2の最小絶対値に変換するように適合された、請求項1に記載の装置。 - 前記コントローラは、1のスケールファクタを設定することができ、
前記コントローラは、0のオフセット値を設定することができる、請求項1に記載の装置。 - 前記1つまたは複数のブロックは、スケーリングおよびオフセットの両方を行うスケーリングおよびオフセットブロックを備える、請求項1に記載の装置。
- 前記デコーダは、低密度パリティチェック(LDPC)デコーダであり、
前記上位プロセッサから受け取られた前記値は、ハード決定ビットと1つまたは複数の信頼値ビットとを有するソフト出力値である、請求項1に記載の装置。 - 前記コントローラが、
(a)(i)前記初期スケールファクタを1に、前記初期オフセット値を0よりも大きい値に設定し、(ii)その後に前記初期スケールファクタを0から1の間に、前記初期オフセット値を0に変更すること、及び
(b)(i)前記初期スケールファクタを0から1の間に、前記初期オフセット値を0に設定し、(ii)その後に前記初期スケールファクタを1になるように、前記初期オフセット値を0よりも大きい値になるように変更すること、
から少なくとも1つを選択するように適合された、請求項1に記載の装置。 - 前記デコーダは、前記初期スケールファクタおよび前記初期オフセット値の少なくとも1つを変更すると、さらに前記EC符号化された符号語の復号を実行する、請求項1に記載の装置。
- 正しい符号語を復元するように誤り訂正(EC)符号化された符号語を復号する方法であって、
(a)初期スケールファクタおよび初期オフセット値を選択し、
(b)上位プロセッサから初期値の初期セットを受け取ることを含み、前記初期セットは、前記EC符号化された符号語に対応し、前記初期セット内の各初期値は、前記EC符号化された符号語の異なるビットに対応するものであり、さらに、
(c)初期値の前記初期セットに基づいて、メッセージの第1のセットを発生し、
(d)前記初期スケールファクタおよび前記初期オフセット値に基づいて、メッセージの前記第1のセットをスケーリングおよびオフセットされたメッセージに変換し、そして、
(e)その後に、復号がトラッピング・セットに直面したことを判断した後、前記初期スケールファクタおよび前記初期オフセット値の少なくとも1つを変更する、ことを含む方法。 - 正しい符号語を復元するように誤り訂正(EC)符号化された符号語を復号する方法であって、
(a)前記EC符号化された符号語の復号のために、初期スケールファクタおよび初期オフセット値を選択し、
(b)上位プロセッサから初期値の初期セットを受け取ることを含み、前記初期セットは、前記EC符号化された符号語に対応し、前記初期セット内の各初期値は、前記EC符号化された符号語の異なるビットに対応するものであり、さらに、
(c)初期値の前記初期セットに基づいて、メッセージの第1のセットを発生し、
(d)前記初期スケールファクタおよび前記初期オフセット値に基づいて、メッセージの前記第1のセットをスケーリングおよびオフセットされたメッセージに変換し、そして、
(e)その後に、前記EC符号化された符号語の復号のために、前記初期スケールファクタおよび前記初期オフセット値の少なくとも1つを変更する、ことを含む方法。
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