JP6883033B2 - 構造化低密度パリティチェック(ldpc)コードのパンクチャリング - Google Patents
構造化低密度パリティチェック(ldpc)コードのパンクチャリング Download PDFInfo
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Description
本出願は、2015年11月12日に出願した米国仮特許出願第62/254,678号および2016年7月5日に出願した米国特許出願第15/202,207号の利益および優先権を主張するものであり、両出願の全体が参照により本明細書に組み込まれている。
図1は、本開示の態様が実行される場合がある通信ネットワークまたは通信システム100の一例を示す。たとえば、ワイヤレスノード116またはBS102などの送信デバイスは、コードワードを生成するために低密度パリティチェック(LDPC)コードに基づいて情報ビットのセットを符号化することができ、LDPCコードは、第1の数の変数ノードと第2の数のチェックノードとを有する行列によって定義される。送信デバイスは、パンクチャドコードワードを生成するためにコードワードをパンクチャリングすることができる。たとえば、送信デバイスは、パンクチャリングパターンに従ってパンクチャリングを実行することができる。送信デバイスは、チェックノードに対して一定次数の接続性(たとえば、最高次数の接続性)を有する変数ノードのうちの1つまたは複数に対応するビットをパンクチャリングすることができる。送信デバイスは、次いで、パンクチャドコードワードを送信することができる。
多くの通信システムは誤り訂正コードを使用する。具体的には、誤り訂正コードは、データストリーム内に冗長性を取り入れることによってこれらのシステム内の情報転送の固有の不信頼性を補償する。低密度パリティチェック(LDPC)コード(Gallagerコードとしても知られている)は、反復コーディングシステムを使用する特定のタイプの誤り訂正コードである。LDPCコードは、そのパリティチェック行列の要素Hの大部分が「0」である線形ブロックコードである。
たとえば、802.11ワイヤレス規格に従って動作するWi-Fiシステム(たとえば、802.11anシステムおよび802.11acシステム)に関するLDPCコードなど、いくつかのシステムに対して構造化低密度パリティチェック(LDPC)コードが定義されている。上記で説明したように、LDPCは、情報ビットを符号化するために使用され得る誤りコーディング方式の一例である。LDPCコードは、固定コードレートに関して設計され得る。コーディングレートを増大させるために、コードワードをパンクチャリングすることができる。
いくつかの態様によれば、拡張された性能を備えたLDPCコードを取得する1つの方法は、Wi-Fi LDPCコードの最高次数変数ノードのパンクチャリングに基づき得る。図8は、本開示のいくつかの態様による、ワイヤレス通信のための例示的な動作800を示す。動作800は、たとえば、送信デバイス(たとえば、UE116またはBS102)によって実行され得る。動作800は、802において、コードワード(たとえば、レート5/6のコードワード)を生成するためにLDPCコードに基づいて情報のセットを符号化することによって開始することができ、LDPCコードは、第1の数の変数ノードと第2の数のチェックノードとを有する行列によって定義される。804において、送信デバイスは、パンクチャドコードワードを生成するためにコードワードをパンクチャリングし、パンクチャリングは、(たとえば、パンクチャドコードワードに対して7/8のコードレートを達成するために)チェックノードに対して一定次数の接続性を有する変数ノードのうちの1つまたは複数に対応するビットをパンクチャリングするように設計された第1のパンクチャリングパターンに従って実行される。806において、送信デバイスはパンクチャドコードワードを送信する。
レート5/6 Wi-Fi LDPCコードのパンクチャリングによって取得されるレート7/8 LDPCコードは、結果として、コードのコードブロック長を低減し得る。場合によっては、残りのブロック長(たとえば、リフトサイズZ=81に対して1944ビット)が望ましい場合がある。いくつかの態様によれば、レート5/6 Wi-Fiコードのパンクチャリングに基づかないマルチエッジレート7/8 LDPCコードを設計することができる。図14は、本開示のいくつかの態様による、ワイヤレス通信のための例示的な動作1400を示す。動作1400は、たとえば、送信デバイス(たとえば、UE116またはBS102)によって実行され得る。動作1400は、1402において、コードワードを生成するためにマルチエッジLDPCコードに基づいて情報ビットのセットを符号化することによって開始することができ、LDPCコードは、基準LDPCコードに対して、追加の変数ノードを含む第1の数の変数ノードと、第2の数のチェックノードとを有する行列によって定義される。1404において、送信デバイスは、パンクチャドコードワードを生成するためにコードワードをパンクチャリングし、パンクチャリングは、パンクチャドコードワードに対して一定のコードレート(たとえば、7/8コードレート)を達成するために変数ノードのうちの1つまたは複数に対応するビットをパンクチャリングするように設計されたパンクチャリングパターンに従って実行される。1406において、送信デバイスはパンクチャドコードワードを送信する。
いくつかの態様によれば、再送信のためのパンクチャリングビットは異なり得る(たとえば、交換され得る)。情報の後続の再送信の場合、パンクチャリングビットは同じまたは同様の次数のノード間で交換され得る。たとえば、第1の送信の場合、始端から93ビットをパンクチャリングすることができ(たとえば、ビット[0〜92])、第2の送信の場合、オフセットにおいてパンクチャリングを実行することができる(たとえば、10のオフセットにおいて、ビット[10〜112]をパンクチャリングすることができる)。
102 BS、基地局、アクセスポイント
104 アンテナ
106 アンテナ
108 アンテナ
110 アンテナ
112 アンテナ
114 アンテナ
116 ワイヤレスノード
118 逆方向リンク、通信リンク
120 順方向リンク、通信リンク
122 ワイヤレスノード
124 逆方向リンク、通信リンク
126 順方向リンク、通信リンク
130 ワイヤレスノード
132 順方向リンク
134 逆方向リンク
136 IoEデバイス、ワイヤレスノード
138 逆方向リンク
140 順方向リンク、通信リンク
142 IoEデバイス、ワイヤレスノード
144 逆方向リンク、通信リンク
146 順方向リンク、通信リンク
200 多入力多出力(MIMO)システム、システム
210 送信機システム、システム、アクセスポイント、ワイヤレス基地局
212 データソース
214 送信(TX)データプロセッサ
220 TX MIMOプロセッサ
222 送信機、受信機
222a〜222t 送信機(TMTR)、受信機
224 アンテナ
224a〜224t アンテナ
230 プロセッサ、TX MIMOプロセッサ
232 メモリ
236 データソース
238 TXデータプロセッサ
240 復調器
242 RXデータプロセッサ
250 受信機システム、システム、ワイヤレスノード
252 アンテナ
252a〜252r アンテナ
254 受信機
254a〜254r 受信機(RCVR)、送信機
260 RXデータプロセッサ
270 プロセッサ
272 メモリ
280 変調器
302 ワイヤレスデバイス
304 プロセッサ
306 メモリ
308 ハウジング
310 送信機
312 受信機
314 トランシーバ
316 送信アンテナ
318 信号検出器
320 デジタル信号プロセッサ(DSP)
322 バスシステム
400 2部グラフ
410 変数ノード
420 チェックノード
400A 行列表現
600 簡素化ブロック
602 畳み込みエンコーダ、エンコーダ
604 パンクチャリングモジュール
606 マッパ
608 Txチェーン
610 アンテナ
612 パンクチャパターン
620 メッセージ
622 符号化ビットストリーム、ビットストリーム、非パンクチャドビットストリーム
624 出力
626 Txシンボル
628 RF信号
650 無線周波数(RF)モデム、モデム部分
700 簡素化概略図
702 アンテナ
704 RFチェーン
706 デマッパ
708 畳み込みデコーダ、デコーダ
710 パンクチャパターン
720 RF信号
722 シンボル、パンクチャドビットストリーム
724 ビットストリーム、デパンクチャドビットストリーム
726 復号メッセージ、メッセージ
728 対数尤度比(LLR)
750 RFモデム、モデム
800 動作
900 5/6レートWi-Fi LDPCコード
902 変数ノード
904 チェックノード
1002 2次数ノード
1102 4次数ノード
1200 グラフ
1202 曲線
1204 曲線
1206 曲線
1208 曲線
1300 グラフ
1302 曲線
1304 曲線
1306 曲線
1308 曲線
1400 動作
Claims (10)
- 無線技術に従ってデータをワイヤレスで送信するための方法であって、
コードワードを生成するために低密度パリティチェック(LDPC)コードに基づいて情報ビットのセットを符号化するステップであって、前記LDPCコードが、第1の数の変数ノードと第2の数のチェックノードとを有する行列によって定義される、符号化するステップと、
パンクチャドコードワードを生成するために前記コードワードをパンクチャリングするステップであって、前記パンクチャリングが、前記チェックノードに対して最高次数の接続性を有する前記コードワードの始端において少なくとも1つの変数ノードに対応するビットをパンクチャリングし、前記コードワードの終端において複数のビットをパンクチャリングするように設計された第1のパンクチャリングパターンに従って実行される、パンクチャリングするステップと、
ワイヤレスチャネルにわたって前記無線技術に従って前記パンクチャドコードワードを送信するステップと
を含む、方法。 - 前記第1のパンクチャリングパターンが、所与の周期性で、前記コードワードの前記始端における前記第1の数のビットを除いて、前記コードワードの残りのビットをパンクチャリングするようにさらに設計される、請求項1に記載の方法。
- 前記第1のパンクチャリングパターンが、パンクチャビットを有する2つ以上の変数ノードに接続された前記チェックノードの数を制限するように設計される、請求項1に記載の方法。
- 前記第1のパンクチャリングパターンが、前記パンクチャドコードワード内の閉ループの数を制限するように設計される、請求項1に記載の方法。
- 情報ビットの前記セットの再送信の場合、前記パンクチャリングが、前記第1のパンクチャリングパターンとは異なる前記コードワードのビットをパンクチャリングするように設計された第2のパンクチャリングパターンに従って実行される
請求項1に記載の方法。 - 前記第2のパンクチャリングパターンが、前記第1のパンクチャリングパターンに対して、前記チェックノードに対して同じ次数の接続性を有する変数ノード間でパンクチャビットを交換するように設計される、請求項5に記載の方法。
- 前記第2のパンクチャリングパターンが、前記第1のパンクチャリングパターンによってパンクチャリングされた前記コードワード内のビットに対して定義されたオフセットにおいて前記コードワード内のビットをパンクチャリングするように設計される、請求項5に記載の方法。
- 前記符号化が、結果として、前記コードワードに対して5/6の第1のコードレートをもたらし、前記第1のパンクチャリングパターンが、前記パンクチャドコードワードに対して7/8の第2のコードレートを達成するように設計される、請求項1に記載の方法。
- ワイヤレス通信のための装置であって、請求項1から8のいずれか一項に記載の方法を実行するための手段を含む、装置。
- プロセッサにおいて実行されたとき、コンピュータに請求項1から8のいずれか一項に記載の方法を実行させるコンピュータ実行可能コードを記憶したコンピュータ可読媒体。
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