JP2020522951A - 基底行列内の隣接する行のペアワイズ直交性を有するqc−ldpcコードの符号化および復号化 - Google Patents
基底行列内の隣接する行のペアワイズ直交性を有するqc−ldpcコードの符号化および復号化 Download PDFInfo
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Abstract
Description
本出願は、2017年6月10日に出願した米国仮特許出願第62/517,916号、2017年6月19日に出願した米国仮特許出願第62/522,044号、および2018年6月7日に出願した米国特許出願第16/003,047号の利益および優先権を主張するものである。3つのすべての出願は、以下に完全に記載されるかのように、すべての適用可能な目的で、その全体が参照により本明細書に組み込まれる。
図1は、本開示の態様が実行される場合がある例示的なワイヤレス通信ネットワーク100を示す。たとえば、ワイヤレス通信ネットワーク100は、ニューラジオ(NR)または5Gネットワークであり得る。NRネットワークは、本開示のいくつかの態様に従って、いくつかの送信のために低密度パリティチェック(LDPC)コーディングを使用することができる。たとえば、ダウンリンク上の基地局(BS)110またはアップリンク上のユーザ機器(UE)120などの送信デバイスは、ワイヤレス通信ネットワーク100内の受信デバイスに対する送信のために情報ビットを符号化することができる。送信デバイスは、LDPCコードを使用して、いくつかの送信のために情報ビットを符号化する。LDPCコードに関連する基本グラフは、基本グラフの下側部分の中にペアワイズの行直交性を有し得る。ダウンリンク上のUE120またはアップリンク上のBS110などの受信デバイスは、送信デバイスから符号化された送信を受信し、送信を復号して、情報を取得する。受信デバイスは、よりフレキシブルなデコーダスケジューリングのためにデコーダ内でペアワイズの行直交性を活用し得る。
(たとえば、NRなどの)多くの通信システムは誤り訂正コードを使用する。誤り訂正コードは、一般に、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(たとえば、空気媒体上で)情報転送の固有の不信頼性を補償する。低密度パリティ検査(LDPC)コードは、反復コーディングシステムを使用する1つのタイプの誤り訂正コードである。Gallagerコードは、「正規」LDPCコードの例である。正規LDPCコードは、そのパリティチェック行列(PCM)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。
ニューラジオ(NR)において、いくつかのチャネルのチャネルコーディングのために、低密度パリティチェック(LDPC)が使用される。図7〜図10に関して上記で説明したように、LDPCコードは、変数ノードとチェックノードとを含む基本グラフによって定義され、基本グラフは、変数ノードに対応する列とチェックノードに対応する行とを有する、対応するパリティチェック行列(PCM)によって表され得る。基本グラフ内のエッジは、PCM内にエントリを有する。準巡回(quasi-cyclic)LDPCコードは、第i番目の列および第j番目の行に対して、PCM内の非ゼロエントリ内に整数の巡回リフティング値Vi,jを有する。巡回リフティング値は、基本グラフがリフトされたグラフを取得するためにリフトされるとき、エッジの巡回置換に対応する。リフトの数Zは、リフティング値またはリフティングサイズ値である。様々なブロック長をサポートするために、基本グラフに対する様々なZ値が使用される。それぞれのサポートされるリフトに対して、リフティングサイズおよび巡回リフティング値に応じて、シフト係数が計算される:
Pi,j=f(Vi,j, Z)
LDPC符号化の前に短縮が適用され得る。システマティックビットがパンクチャリングされ得る。
102a マクロセル
102b マクロセル
102c マクロセル
102x ピコセル
102y フェムトセル
102z フェムトセル
110 BS、基地局(BS)
110a BS
110b BS
110c BS
110r 中継局
110x BS
110y BS
110z BS
120 UE、ユーザ機器(UE)、ユーザ端末
120r UE
120x UE
120y UE
130 ネットワークコントローラ
200 分散RAN
202 ANC
204 次世代コアネットワーク(NG-CN)
206 5Gアクセスノード(AN)
208 TRP、DU
210 次世代アクセスノード(NG-AN)
300 分散RAN
302 集中型コアネットワークユニット(C-CU)
304 集中型RANユニット(C-RU)
306 DU
412 データソース
420 送信プロセッサ、プロセッサ
430 TX MIMOプロセッサ、送信(TX)多入力多出力(MIMO)プロセッサ
432 変調器
432a〜432t 復調器/変調器
434 アンテナ
434a〜434t アンテナ
436 MIMO検出器
438 受信プロセッサ、プロセッサ
439 データシンク
440 コントローラ/プロセッサ
442 メモリ
444 スケジューラ
452a〜452r アンテナ
454 復調器
454a〜454r 復調器/変調器(DEMOD)
456 MIMO検出器
458 受信プロセッサ、プロセッサ
460 データシンク
462 データソース
464 送信プロセッサ、プロセッサ
466 TX MIMOプロセッサ、プロセッサ
480 コントローラ/プロセッサ
482 メモリ
500 図
505-a 第1のオプション
505-b 第2のオプション
510 RRCレイヤ
515 PDCPレイヤ
520 RLCレイヤ
525 MACレイヤ
530 PHYレイヤ
600 フレームフォーマット
700 2部グラフ
700A 行列表現
710 変数ノード
711 変数ノード
712 変数ノード
713 変数ノード
714 変数ノード
715 変数ノード
720 チェックノード
721 チェックノード
722 チェックノード
723 チェックノード
724 チェックノード
900 簡素化ブロック図
902 エンコーダ、畳み込みエンコーダ
904 パンクチャリングモジュール
906 マッパ
908 Txチェーン
910 アンテナ
912 パンクチャパターン
920 メッセージ
922 符号化ビットストリーム、ビットストリーム
924 出力
926 Txシンボル
928 RF信号
950 無線周波数(RF)モデム
1000 簡素化概略図
1002 アンテナ
1004 RFチェーン
1006 デマッパ
1008 デコーダ
1010 パンクチャパターン
1020 RF信号
1022 シンボル
1024 ビットストリーム、デパンクチャリングされたビットストリーム
1028 LLR
1100 PCM構造
1102 領域
1104 領域
1106 領域
1108 領域
1110 領域
1200 PCM
1300 通信デバイス
1302 処理システム
1304 プロセッサ
1306 バス
1308 トランシーバ
1310 アンテナ
1312 コンピュータ可読媒体/メモリ
1314 コード
1316 コード
1318 コード
1320 コード
1400 動作
1500 動作
Claims (30)
- ワイヤレス通信のための装置であって
受信機に近接して位置する1つまたは複数のアンテナ要素を介してワイヤレスチャネルにわたって無線技術に従ってコードワードを受信するように構成された受信機と、
メモリに結合された少なくとも1つのプロセッサであって、情報ビットのセットを生成するために、低密度パリティチェック(LDPC)コードに基づいて前記コードワードを復号するように構成されたデコーダ回路を含む、少なくとも1つのプロセッサと
を含み、
前記LDPCコードが、前記メモリ内に記憶され、基本グラフの変数ノードに対応する第1の数の列と前記基本グラフのチェックノードに対応する第2の数の行とを有する基底行列によって定義され、
前記第1の数の列の各々に対して、すべての隣接する行が前記第2の数の行の最後の部分の中で直交する
装置。 - 前記基底行列内のエントリが、前記基底行列内の前記エントリに関連する、前記基本グラフの前記変数ノードと前記チェックノードとの間のエッジに対応する、請求項1に記載の装置。
- 前記基底行列内の前記エントリが、巡回整数リフティング値を含む、請求項2に記載の装置。
- 前記第1の数の列の各々において、前記行の前記最後の部分の中の前記隣接する直交行の各対のせいぜい1個の行がエントリを有する、請求項2に記載の装置。
- 前記行の前記最後の部分が、前記基底行列の少なくとも下部の21個の行を含む、請求項1に記載の装置。
- 前記メモリが、前記LDPCコードの少なくとも一部分を記憶するように構成される、請求項1に記載の装置。
- 前記少なくとも1つのプロセッサが、階層デコーダを含む、請求項1に記載の装置。
- 前記少なくとも1つのプロセッサが、復号スケジュールに基づいて前記コードワードを復号するように構成される、請求項1に記載の装置。
- 前記復号スケジュールが、前記基底行列内で、行単位で連続的に復号することによって、または前記基底行列内の行の対を同時に復号することによって、前記LDPCコードに基づいて前記コードワードを復号することを含む、請求項8に記載の装置。
- 前記少なくとも1つのプロセッサが、前記復号スケジュールの前記同時復号対に対して、前記最後の部分の中のいずれかの3個の連続する行からの2個の行の2つの組合せから選択するように構成される、請求項9に記載の装置。
- 前記行単位または前記行の対が、列単位で実行される、請求項9に記載の装置。
- 前記復号スケジュールが、関連するエントリを含まない前記基底行列の復号部分をスキップすることを含む、請求項8に記載の装置。
- 前記LDPCコードがリフトされたLDPCコードを含む、請求項1に記載の装置。
- 前記コードワードが、パンクチャリングされたコードワードを含み、
前記少なくとも1つのプロセッサが、前記コードワードをデパンクチャリングするように構成されたデパンクチャラをさらに含み、
前記復号することが、前記デパンクチャリングされたコードワードを復号することを含む
請求項1に記載の装置。 - ワイヤレス通信のための装置であって
メモリに結合された少なくとも1つのプロセッサであって、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ように構成されたエンコーダ回路を含む、少なくとも1つのプロセッサであって
前記LDPCコードが、前記メモリ内に記憶され、基本グラフの変数ノードに対応する第1の数の列と前記基本グラフのチェックノードに対応する第2の数の行とを有する基底行列によって定義され、
前記第1の数の列の各々に対して、すべての隣接する行が前記第2の数の行の最後の部分の中で直交する
少なくとも1つのプロセッサと、
送信機であって、前記送信機に近接して配列された1つまたは複数のアンテナ要素を介してワイヤレスチャネルにわたって無線技術に従って前記コードワードを送信するように構成された送信機と
を含む、装置。 - 前記基底行列内のエントリが、前記基底行列内の前記エントリに関連する、前記基本グラフの前記変数ノードと前記チェックノードとの間のエッジに対応する、請求項15に記載の装置。
- 前記基底行列内の前記エントリが、置換された巡回整数リフティング値である、請求項16に記載の装置。
- 前記第1の数の列の各々において、前記行の前記最後の部分の中の前記隣接する直交行の各対のせいぜい1個の行がエントリを有する、請求項16に記載の装置。
- 前記行の前記最後の部分が、前記基底行列の少なくとも下部の21個の行を含む、請求項15に記載の装置。
- 前記少なくとも1つのプロセッサが、前記基底行列の整数のコピーを生成することによって、前記LDPCコードをリフトするように構成され、
前記LDPCコードが、リフトされたLDPCコードを含む
請求項15に記載の装置。 - 前記少なくとも1つのプロセッサが、前記コードワードをパンクチャリングするように構成されたパンクチャラをさらに含み、
前記コードワードを送信することが、前記パンクチャリングされたコードワードを送信することを含む
請求項15に記載の装置。 - ワイヤレス通信のための方法であって、
受信機に近接して位置する1つまたは複数のアンテナ要素を介してワイヤレスチャネルにわたって無線技術に従ってコードワードを受信するステップと、
情報ビットのセットを生成するために、低密度パリティチェック(LDPC)コードに基づいて、デコーダ回路を介して前記コードワードを復号するステップと
を含み、
前記LDPCコードが記憶され、基本グラフの変数ノードに対応する第1の数の列と前記基本グラフのチェックノードに対応する第2の数の行とを有する基底行列によって定義され、
前記第1の数の列の各々に対して、すべての隣接する行が前記第2の数の行の最後の部分の中で直交する
方法。 - 前記第1の数の列の各々において、前記行の前記最後の部分の中の前記隣接する直交行の各対のせいぜい1個の行がエントリを有する、請求項22に記載の方法。
- 前記行の前記最後の部分が、前記基底行列の少なくとも下部の21個の行を含む、請求項22に記載の方法。
- 前記復号するステップが、復号スケジュールに基づき、
前記復号スケジュールが、前記基底行列内で、行単位で連続的に復号することによって、または前記基底行列内の行の対を同時に復号することによって、前記LDPCコードに基づいて前記コードワードを復号するステップを含む
請求項22に記載の方法。 - 前記復号スケジュールの前記同時復号対に対して、前記最後の部分の中のいずれかの3個の連続する行からの2個の行の2つの組合せから選択するステップをさらに含む、請求項25に記載の方法。
- ワイヤレス通信のための方法であって、
コードワードを生成するために、エンコーダ回路を用いて、低密度パリティチェックコード(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、基本グラフの変数ノードに対応する第1の数の列と前記基本グラフのチェックノードに対応する第2の数の行とを有する基底行列によって定義され、
前記第1の数の列の各々に対して、すべての隣接する行が前記第2の数の行の最後の部分の中で直交する、
符号化するステップと、
1つまたは複数のアンテナ要素を介してワイヤレスチャネルにわたって無線技術に従って前記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の数の列の各々において、前記行の前記最後の部分の中の前記隣接する直交行の各対のせいぜい1個の行がエントリを有する、請求項27に記載の方法。
- 前記行の前記最後の部分が、前記基底行列の少なくとも下部の21個の行を含む、請求項27に記載の方法。
- 前記コードワードをパンクチャリングするステップをさらに含み、前記コードワードを送信するステップが、前記パンクチャリングされたコードワードを送信するステップを含む、請求項27に記載の方法。
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