JP2010538502A - 容量を最適化したコンステレーションで信号を送信する設計方法論及び方法及び装置 - Google Patents
容量を最適化したコンステレーションで信号を送信する設計方法論及び方法及び装置 Download PDFInfo
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Abstract
【選択図】図1
Description
本発明は一般的には、帯域幅、及び/又は電力効率の良いデジタル信号システムに関し、より詳細には、容量を増加させた不等間隔のコンステレーションの使用に関する。
したがって、優良な最小距離特性を有する複数の多次元のコンステレーションが設計されてきた。
実際のコンステレーションは有限であり、記号を同様の確率で送信するため、ガウス型の容量と比較して少ない容量を有する。コンステレーションの容量は、そのコンステレーションを用いた符号化を行った場合に得ることができる利得の限界を表すと考えられる。
<通信システム>
<幾何学的形状のコンステレーション>
<幾何学的形状のコンステレーションの選択>
<既存の通信システムのアップグレード>
<共通容量及び並列復号容量>
CJOINT=I(X;Y)
<最適な容量を有するコンステレーションの選択>
<所与のSNRにおけるM−ARYコンステレーションの容量の最適化>
<最適化されて幾何学的に離間したコンステレーションによって達成可能なメリット>
<容量最適化PAMコンステレーション>
<容量最適化PSKコンステレーション>
<適応型レート設計>
<幾何学的形状のQAMコンステレーション>
<N次元のコンステレーションの最適化>
<フェージングチャネルのための容量最適化コンステレーション>
Y=a(t).X+N
ここで、Xは送信された信号、Nは加法性ホワイトガウスノイズ信号、a(t)は、時間の関数であるフェージング分布である。
Claims (12)
- 通信チャネルを介して信号を受信機に送信するように構成された送信機を含むデジタル通信システムであって、
前記送信機が、
ユーザビットを受信して、拡張された出力符号化ビットレートで符号化ビットを出力するように構成された符号器と、
符号化ビットを記号コンステレーションの記号にマッピングするように構成されたマッパーと、
前記マッパーによって生成された記号を用いて前記通信チャネルを介して送信するための信号を生成するように構成された変調器とを有し、
前記受信機が、
前記通信チャネルを介して受信した信号を復調するように構成された復調器と、
復調された信号から尤度を推定するように構成されたデマッパーと、
前記デマッパーによって生成された尤度から復号されたビットを推定するように構成された復号器と、を有し、
前記記号コンステレーションが、dminを最大化する信号コンステレーションと比較して低減された信号対ノイズ比で、所与の容量を提供する、容量最適化された幾何学的に離間した記号コンステレーションである、デジタル通信システム。 - 前記幾何学的に離間した記号コンステレーションは、追加的な制限に従って容量最適化されている、請求項1記載の通信システム。
- 幾何学的形状の記号コンステレーションは、並列復号(parallel decode)を用いて容量について最適化されている、請求項1記載の通信システム。
- 幾何学的形状の記号コンステレーションは、共通容量(joint capacity)を用いて容量について最適化されている、請求項1記載の通信システム。
- 前記通信チャネルはAWGNチャネルである、請求項1記載の通信システム。
- 前記通信チャネルはフェージングチャネルである、請求項1記載の通信システム。
- 前記幾何学的に離間した記号コンステレーションのコンステレーションポイントは、ユーザレートに応じて可変である、請求項1記載の通信システム。
- 通信チャネルを介してユーザ情報のビットを送信する方法であって、該方法は、
符号体系を用いて前記ユーザ情報のビットを符号化するステップと、
前記ユーザ情報の符号化ビットを記号コンステレーションにマッピングするステップであって、
前記記号コンステレーションは、dminを最大化する信号コンステレーションと比較して低減された信号対ノイズ比で、所与の容量を提供する、容量最適化された幾何学的に離間した記号コンステレーションであるステップと、
変調方式に従って、記号を変調するステップと、
前記通信チャネルを介して変調された信号を送信するステップと、
変調された信号を受信するステップと、
前記変調方式に従って前記変調された信号を復調するステップと、
尤度を生成するために前記幾何学的形状の信号コンステレーションを用いて復調された信号をデマッピングするステップと、
復号されたビットの推定値を取得するために前記尤度を復号するステップと、を含む方法。 - 通信システムで使用される幾何学的形状の記号コンステレーションのポイントを選択する方法であって、該方法は、
適当なコンステレーションのサイズと、次元当たりの所望の容量を選択するステップと、
システムが動作する可能性のある初期SNRを推定するステップと、
dminを最大化するコンステレーションに対して前記コンステレーションのSNR性能に所定の向上が達成されるまで、容量測定値を最大化するように前記コンステレーションのポイントの位置を反復的に最適化するステップと、を含む方法。 - 処理によって得られる通信システムで使用される幾何学的形状の記号コンステレーションであって、前記処理は、
適当なコンステレーションのサイズと、次元当たりの所望の容量を選択するステップと、
システムが動作する可能性のある初期SNRを推定するステップと、
dminを最大化するコンステレーションに対して前記コンステレーションのSNR性能に所定の向上が達成されるまで、容量測定値を最大化するように前記コンステレーションのポイントの位置を反復的に最適化するステップと、を含む幾何学的形状の記号コンステレーション。 - 処理によって得られる通信システムで使用される幾何学的形状の記号コンステレーションであって、前記処理は、
適当なコンステレーションのサイズと、所望のSNRを選択するステップと、
前記コンステレーションの容量測定値を最大化するように前記コンステレーションのポイントの位置を最適化するステップと、を含む幾何学的形状の記号コンステレーション。 - 情報を送信する方法であって、該方法は、
幾何学的(geomterically)形状の記号コンステレーションを用いてチャネルを介して情報を送信するステップと、
前記幾何学的形状の記号コンステレーションの中のポイントの位置を変更して、目標ユーザデータレートを変更するステップと、を含む方法。
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PCT/US2008/065994 WO2008151308A1 (en) | 2007-06-05 | 2008-06-05 | Design methodology and method and apparatus for signaling with capacity optimized constellations |
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