JP2011010287A - 受信装置及び方法、プログラム、並びに受信システム - Google Patents
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Abstract
【解決手段】図17のAの検査行列Hの列の1乃至10列のうち、8列が、パンクチャされたビットもしくはシンボルに相当する列なので、着目する列になる。図17のBに示されるように、第1の処理として、着目する列(8列)に非0要素を持つ行(3行と4行)同士のガロア体上の加算が行われる。その結果、図17のCに示されるように、該当列(8列)の非0要素(3行8列)が0になる。次に、第2の処理として、第1の処理によって非0要素のなくなった列(8列)が削除される。その結果、図17のDに示されるように縮小された検査行列Hが得られることになる。本発明は、DVB-T.2の受信装置に適用することができる。
【選択図】図17
Description
図27は、図11の構成の受信装置に適用可能な受信システムの第1の構成例を示すブロック図である。
104 セルデインタリーバ, 105 切替部, 106 デマッピング部, 107 ビットデインタリーバ, 108 切替部, 109 デパンクチャ/デ0パディング部, 110 切替部, 111 LDPCデコーダ, 112 BCHデコーダ, 113
TSバッファ, 114 制御部, 201 取得部, 202 伝送路復号処理部, 203 情報源復号処理部, 204 出力部, 205 記憶部, 301 CPU, 302 ROM, 303 RAM, 308 記憶部, 311 リムーバブルメディア
Claims (16)
- LDPC(Low Density Parity Check)符号化された符号化系列であって、その少なくとも一部がパンクチャされた符号化系列を復号対象として受信する受信手段と、
LDPC符号化された際に用いられた元の検査行列の列のうち、パンクチャされたビットもしくはシンボルに相当する列に着目して、その列に非0要素を持つ行同士のガロア体上の加算を行い、その非0要素を0にするという第1の処理と、前記第1の処理によって非0要素のなくなった列を削除するという第2の処理とを含むパンクチャ行列変換処理を実行し、前記パンクチャ行列変換処理の結果得られた行列を検査行列として用いて、前記受信手段に受信された前記符号化系列に対してLDPC復号処理を施すLDPC復号手段と
を備える受信装置。 - 前記受信手段に受信された前記符号化系列は、さらに、0 パディングを含むLDPC符号化された符号化系列を有しており、
前記LDPC復号手段は、
前記元の検査行列に対して、前記パンクチャ行列変換処理に加えて、0パディングされたビットもしくはシンボルに相当する列を削除する0パディング行列変換処理を施し、
前記パンクチャ行列変換処理と前記0パディング行列変換処理の結果得られた行列を検査行列として用いて、前記受信手段に受信された前記符号化系列に対してLDPC復号処理を施す
請求項1に記載の受信装置。 - 前記受信手段に受信された前記符号化系列は、さらに、0パディングによって挿入された0が符号語からパンクチャされており、
前記LDPC復号手段は、前記0パディング行列変換処理の一部としてさらに、前記元の検査行列における0パディングに相当する列を削除した行列へ変換する処理を実行する
請求項2に記載の受信装置。 - 前記LDPC復号手段は、前記パンクチャ行列変換処理と前記0パディング行列変換処理のうち少なくとも一方において、前記元の検査行列のgirthを保つ
請求項2に記載の受信装置。 - 前記LDPC復号手段は、前記パンクチャ行列変換処理と前記0パディング行列変換処理のうち少なくとも一方において、前記元の検査行列のgirthを変化させる
請求項2に記載の受信装置。 - 前記LDPC復号手段は、前記パンクチャ行列変換処理と前記0パディング行列変換処理のうち少なくとも一方において、前記元の検査行列の最小ループ数を保つ
請求項2に記載の受信装置。 - 前記LDPC復号手段は、前記パンクチャ行列変換処理と前記0パディング行列変換処理のうち少なくとも一方において、前記元の検査行列の最小ループ数を変化させる
請求項2に記載の受信装置。 - 前記受信手段に受信された前記符号化系列は、さらに、ビットインタリーブされており、
前記パンクチャ行列変換処理と前記0パディング行列変換処理の結果得られる行列に応じたデパンクチャとデ0パディングを行うデパンクチャ/デ0パディング手段をさらに備える
請求項2に記載の受信装置。 - 前記受信装置は、DVB(Digital Video Broadcasting)-T.2に準拠しており、
前記受信手段に受信された前記符号化系列は、前記DVB-T.2で規定されているL1信号のうち、少なくともプレ信号を含む
請求項2に記載の受信装置。 - 前記受信手段に受信された前記符号化系列は、前記L1信号のうち、さらにポスト信号を含む
請求項9に記載の受信装置。 - 前記受信装置は、DVB(Digital Video Broadcasting)-C.2に準拠しており、
前記受信手段に受信された前記符号化系列は、前記DVB-C.2で規定されているL1 part2信号を含む
請求項2に記載の受信装置。 - 前記LDPC復号手段は、前記パンクチャ行列変換処理と前記0パディング行列変換処理において、LDPC復号の並列処理単位を削る削除や行変換の処理を禁止する
請求項2に記載の受信装置。 - 前記LDPC復号手段は、前記パンクチャ行列変換処理と前記0パディング行列変換処理において、LDPC復号の並列処理単位を削る削除や行変換の処理を禁止しない
請求項2に記載の受信装置。 - LDPC(Low Density Parity Check)符号化された符号化系列であって、その少なくとも一部がパンクチャされた符号化系列を復号対象として受信する受信手段を備える受信装置が、
LDPC符号化された際に用いられた元の検査行列の列のうち、パンクチャされたビットもしくはシンボルに相当する列に着目して、
その列に非0要素を持つ行同士のガロア体上の加算を行い、その非0要素を0にするという第1の処理と、
前記第1の処理によって非0要素のなくなった列を削除するという第2の処理と
を含むパンクチャ行列変換処理を実行し、
前記パンクチャ行列変換処理の結果得られた行列を検査行列として用いて、前記受信手段に受信された前記符号化系列に対してLDPC復号処理を施す
ステップを含む受信方法。 - LDPC(Low Density Parity Check)符号化された符号化系列であって、その少なくとも一部がパンクチャされた符号化系列を復号対象として受信する受信手段を備える受信装置を制御するコンピュータに、
LDPC符号化された際に用いられた元の検査行列の列のうち、パンクチャされたビットもしくはシンボルに相当する列に着目して、
その列に非0要素を持つ行同士のガロア体上の加算を行い、その非0要素を0にするという第1の処理と、
前記第1の処理によって非0要素のなくなった列を削除するという第2の処理と
を含むパンクチャ行列変換処理を実行し、
前記パンクチャ行列変換処理の結果得られた行列を検査行列として用いて、前記受信手段に受信された前記符号化系列に対してLDPC復号処理を施す
ステップを含む制御処理を実行させるプログラム。 - LDPC(Low Density Parity Check)符号化された符号化系列であって、その少なくとも一部がパンクチャされた符号化系列を含む信号を伝送路を介して取得する取得手段と、
前記取得手段が前記伝送路を介して取得した信号に対して、前記伝送路で生じる誤りを訂正する処理を少なくとも含む伝送路復号処理を施し、その結果得られる信号を出力する伝送路復号手段と、
前記伝送路復号手段の出力信号に対して情報源復号処理を施す情報源復号処理手段、または、前記伝送路復号手段の出力信号を記録媒体に記録させる記録手段と
を備え、
前記伝送路復号手段は、
LDPC符号化された際に用いられた元の検査行列の列のうち、パンクチャされたビットもしくはシンボルに相当する列に着目して、その列に非0要素を持つ行同士のガロア体上の加算を行い、その非0要素を0にするという第1の処理と、前記第1の処理によって非0要素のなくなった列を削除するという第2の処理とを含むパンクチャ行列変換処理を実行し、前記パンクチャ行列変換処理の結果得られた行列を検査行列として用いて、前記取得手段により取得された前記符号化系列に対してLDPC復号処理を施すLDPC復号手段を有する
受信システム。
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