JP4593878B2 - 無線通信システムにおいて、チャネル状態情報を利用するための方法および装置 - Google Patents
無線通信システムにおいて、チャネル状態情報を利用するための方法および装置 Download PDFInfo
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Description
分野
[1001]この発明は一般にデータ通信に関し、特に、無線通信システムのための改良された性能を供給するために、(全部または一部の)チャネル状態情報を利用するため新規で改良された方法および装置に関する。
[1002]無線通信システムは、音声、データ、等のような種々のタイプの通信を供給するために幅広く展開されている。これらのシステムは、符号分割多重アクセス(CDMA)、時分割多元接続(TDMA)、直交周波数分割多重(OFDM)またはその他の変調技術に基づくことができる。OFDMシステムは、いくつかのチャネル環境に対して高い性能を供給することができる。
マルチチャネルマルチポイントディストリビューションシステム(multi-channel multi-point distribution system)(MMDS)およびその他)において、送信器装置からのRF変調された信号は、多数の送信経路を介して受信器装置に到達する場合がある。送信経路の特性は、一般的に、フェージングおよび多経路のような多数の要因により時間に対して変化する。
[1033]図2Aは、図1のシステム110の送信器部分の一実施の形態である、MIMO送信器システム110aの一実施の形態のブロック図である。(OFDMを利用しない)送信器システム110aは、受信システム150により報告された部分CSIに基づいてその処理を調節することができる。システム110aは、(1)情報ビットを受信して処理し、変調記号を供給するTXデータプロセッサ114aおよび(2)NTの送信アンテナに対して変調記号を逆多重化するTX MIMOプロセッサ120aを含む。
[1041]図2Bは、受信器システム150により報告された完全CSIに基づいてデータを処理することのできる(OFDMを利用しない)MIMO送信器システム110bの一実施の形態のブロック図である。情報ビットは、TXデータプロセッサ114により符号化され、インターリーブされ、記号マッピングされ変調記号を発生する。符号化および変調は、受信器システムにより報告される利用可能な完全CSIに基づいて調節することができ、MIMO送信システム110aに対して上述のように実行することができる。
[1045]図3は、OFDMを利用し、完全または部分CSIに基づいてその処理を調節することができる、MIMO送信器システムの一実施の形態のブロック図である。情報ビットは、TXデータプロセッサ114により、符号化され、インターリーブされ、パンクチュアドされ、および記号マッピングされ、変調記号を発生する。符号化および変調は、受信器システムにより報告された利用可能な完全または部分CSIに基づいて調節することができる。OFDMを有したMIMOシステムの場合、変調記号は、複数の周波数サブチャネルでおよび複数の送信アンテナから送信することができる。純粋なMIMO通信モードで動作するとき、各周波数サブチャネルでかつ各送信アンテナからの送信は、非複製されたデータを表す。
[1062]この発明の観点は、MIMOシステムで受信した信号を処理し、送信されたデータを再生し、MIMOチャネルの特性を推定するための技術を供給する。次に、推定されたチャネル特性を送信器システムに報告することができ、信号処理(例えば、符号化、変調、等)を調節するために使用される。このようにして、決定されたチャネル条件に基づいて、高性能が得られる。ここに記載する受信器処理技術は、チャネル相関マトリクス反転(CCMI)技術、バイアスされない最小平均2乗誤差(UMMSE)技術、および完全CSI技術を含む。これらはすべて以下に詳細に記載される。他の受信器処理技術も使用することができ、この発明の範囲内である。
[1067]CCMI技術の場合、受信器システムは最初に受信した記号ベクトル
はエルミート行列であり、すなわち、複素共役対称である。チャンネル雑音の成分が無相関であり、さらに独立しており、完全に同じように配布されるなら、雑音ベクトル
は以下のように表すことができる。
[1078]UMMSE技術の場合、受信器システムは、受信した記号ベクトル
MIMOプロセッサの一実施の形態を示す。CCMI方法と同様に、マトリクス
[1094]ここに記載した、部分CSI(例えば、CCMIまたはUMMSE)または完全CSI技術を用いて、受信信号に対して、各送信チャネルのSNRを得ることができる。送信チャネルのための決定されたSNRは、逆方向チャネルを介して送信器システムに報告を戻すことができる。送信チャネルのための(すなわち、各空間サブチャネルのためのおよびおそらく、OFDMが採用されるなら、各周波数サブチャネルのための)送信された変調記号のSNR値をフィードバックすることにより、MIMOチャネルの利用を改良するために適応処理(例えば、適応符号化および変調)を実施することが可能である。部分CSIフィードバック技術の場合、完全CSIを伴わずに適応処理を達成することができる。完全CSIフィードバック技術の場合、十分な情報(必ずしも明白な固有値および固有モードである必要はない)が送信器にフィードバックされ、利用される各周波数サブチャネルのための固有値と固有モードの計算を容易にする。
Claims (32)
- 下記を具備する、複数入力−複数出力(MIMO)通信システムにおいて、送信器装置から受信器装置にデータを送信するための方法:
受信器装置において、
複数の受信アンテナを介して複数の信号を受信する、各受信アンテナから前記受信した信号は、前記送信器装置から送信された1つ以上の信号の組合せから構成される、
前記受信した信号を処理し、データ送信のために使用される複数の送信チャネルの特性を示すチャネル状態情報を派生する、
前記チャネル状態情報を前記送信器装置に返送する;
および送信器装置において、
前記受信器装置から前記チャネル状態情報を受信する、および
前記受信したチャネル状態情報に基づいて前記受信器装置への送信のためにデータを処理する、
前記派生されたチャネル状態情報は、前記複数の送信チャネルの各々に対する信号対雑音プラス干渉推定値を具備し、
前記送信器装置における処理は、前記送信チャネルのための信号対雑音プラス干渉推定値に基づいて各送信チャネルのための符号化データを含む、
および各送信チャネルのための前記データは、前記送信チャネルのための前記信号対雑音プラス干渉推定値に基づいて独立して符号化され、前記符号化は、固定されたベースコードで前記送信チャネルのためのデータを符号化することを含む、および
前記送信チャネルのための前記信号対雑音プラス干渉推定値に基づいて符号化されたビットのパンクチャリングを調節する。 - 前記送信器装置における処理はさらに、前記送信チャネルのための前記信号対雑音プラス干渉推定値に基づいて選択された変調スキームに従って各送信チャネルのための符号化されたデータを変調することをさらに含む、請求項1の方法。
- 前記報告されたチャネル状態情報は、送信および受信アンテナのすべての対の間の伝搬路の特性を含む、請求項1の方法。
- 前記報告されたチャネル状態情報は、前記複数の送信チャネルのための固有モードおよび固有値を示す請求項1の方法。
- 前記送信器装置における処理は前記固有値に基づいて前記送信チャネルのためのデータを符号化することを含む、請求項4の方法。
- 各送信チャネルのための前記データは独立して符号化される、請求項5の方法。
- 前記送信器装置における前記処理は、さらに、前記固有値に基づいて選択された変調スキームに従って前記送信チャネルのための符号化されたデータを変調し、変調シンボルを供給することを含む、請求項5の方法。
- 前記送信器装置における前記処理は、さらに、前記固有モードに基づいて、送信前に前記変調シンボルをあらかじめ条件付けすることを含む、請求項7の方法。
- 前記チャネル状態情報は、前記受信器装置から完全に送信される、請求項1の方法。
- 前記チャネル状態情報は、前記受信器装置から完全に周期的に送信され、前記チャネル状態情報に対する更新は完全送信間で送信される、請求項1の方法。
- 特定の閾値を越えるチャネル特性の変化が検出されるとき前記チャネル状態情報は送信される、請求項1の方法。
- 前記固有モードおよび固有値を示す前記チャネル状態情報は異なる更新レートで送信される、請求項4の方法。
- 前記チャネル状態情報は、相関マトリクス反転処理に基づいて前記受信器装置において派生される、請求項1の方法。
- 前記受信器装置における前記相関マトリクス反転処理は下記を含む、請求項13の方法:
前記受信信号を処理して、受信変調シンボルを派生する;
第1のマトリクスに従って前記受信変調シンボルをフィルターし、フィルターされた変調シンボルを供給する、前記第1のマトリクスは、前記データ送信のために使用される複数の送信アンテナおよび前記複数の受信アンテナ間のチャネル特性の推定値を表す;
前記フィルターされた変調シンボルを第2のマトリクスと乗算し、送信された変調シンボルの推定値を供給する;
および
前記データ送信のために使用される複数の送信チャネルの特性を推定する。 - 特定の復調スキームに従って前記復調シンボル推定値を復調し、復調シンボルを供給することをさらに具備する、請求項14の方法。
- 特定の復号スキームに従って、前記復調されたシンボルを復号することをさらに具備する、請求項15の方法。
- 冗長な送信のために変調シンボル推定値を結合し、結合された変調シンボル推定値を供給することをさらに具備する、請求項14の方法。
- さらに下記を具備する請求項14の方法:
前記受信変調シンボルに基づいてチャネル係数マトリクスを派生する、前記第1のマトリクスは、前記チャネル係数マトリクスから派生される。 - 前記チャネル係数マトリクスは、パイロットデータに対応する受信変調シンボルに基づいて派生される、請求項18の方法。
- 前記第2のマトリクスは、前記第1のマトリクスに基づいて派生される逆正方マトリクスである、請求項14の方法。
- 前記チャネル状態情報は、バイアスされない最小平均二乗誤差(UMMSE)処理に基づいて、前記受信器装置において派生される、請求項1の方法。
- 前記UMMSE処理は下記を含む、請求項21の方法:
受信信号を処理し、受信変調シンボルを派生する;
前記受信変調シンボルを第1のマトリクスMと乗算し、送信された変調シンボルの推定値を供給する;
および
前記受信変調シンボルに基づいて、前記データ送信のために使用される複数の送信チャネルの特性を推定する、前記第1のマトリクスMは、前記変調シンボル推定値と送信された変調シンボルとの間の平均二乗誤差を最小にするにように選択される。 - さらに、下記を具備する請求項22の方法:
前記変調シンボル推定値を第2のマトリクスと乗算し、前記送信された変調シンボルのバイアスされない推定値を供給する、前記送信チャネルの特性は、バイアスされない変調シンボル推定値に基づいて推定される。 - 前記バイアスされない変調シンボル推定値に基づいて、およびバイアスされない変調シンボル推定値と前記送信された変調シンボルとの間の平均二乗誤差を最小にするために前記第1のマトリクスMを派生することをさらに具備する、請求項23の方法。
- 前記MIMOシステムは、直交周波数分割変調(OFDM)を実施する、請求項1の方法。
- 前記受信器装置および送信器装置の各々における前記処理は、複数の周波数サブチャネルの各々に対して実行される、請求項25の方法。
- 下記を具備する複数入力複数出力(MIMO)通信システム:
下記を具備する受信器装置
複数の受信アンテナを経由して複数の信号を受信し、前記受信信号を処理して受信変調シンボルを供給するように構成された複数のフロントエンドプロセッサー、
前記フロントエンドプロセッサーと接続され、前記受信変調シンボルを受信して処理し、データ送信のために使用される複数の送信チャネルの特性を示すチャネル状態情報を派生するように構成される少なくとも1つの受信MIMOプロセッサー、および
前記受信MIMOプロセッサーと動作可能に接続され、前記送信器装置に返送するために前記チャネル状態情報を処理するように構成された送信データプロセッサー;
そして
前記受信器装置からの1つ以上の信号を受信して処理し送信されたチャネル状態情報を回復するように構成された少なくとも1つの復調器を具備する送信器装置、および
前記回復されたチャネル状態情報に基づいて前記受信器装置に送信するためのデータを処理するように構成された送信データプロセッサー、
前記派生されたチャネル状態情報は、前記複数の送信チャネルの各々のための信号対雑音プラス干渉推定値を具備し、
前記送信器装置における処理は、前記送信チャネルのための前記信号対雑音プラス干渉推定値に基づいて各送信チャネルのためのデータを符号化することを含み、
および各送信チャネルのための前記データは、前記送信チャネルのための前記信号対雑音プラス干渉推定値に基づいて独立に符号化され、前記符号化は、固定のベースコードで前記送信チャネルのためのデータを符号化することを含み、
および符号化ビットのパンクチャリングを調節することは、前記送信チャネルのための前記信号対雑音プラス干渉推定値に基づく。 - 下記を具備する、複数入力複数出力(MIMO)通信システムにおける受信器装置:
複数の受信アンテナを経由して複数の送信された信号を受信し、前記受信した信号を処理して受信変調シンボルを供給するように構成された複数のフロントエンドプロセッサー;
前記複数のフロントエンドプロセッサーと動作可能に接続され、第1のマトリクスに従って、前記受信した変調シンボルをフィルターし、フィルターされた変調シンボルを供給するように構成されたフィルター、前記第1のマトリクスは、前記データ送信のために使用される複数の送信アンテナと前記複数の受信アンテナとの間のチャネル特性の推定値を表す;
前記フィルターに接続され、前記フィルターされた変調シンボルを第2のマトリクスと乗算し、送信された変調シンボルの推定値を供給するように構成される乗算器;
前記乗算器に接続され、前記データ送信のために使用される複数の送信チャネルの特性を推定し、前記推定されたチャネル特性を示すチャネル状態情報を供給するように構成されたチャネル品質推定器;
および
前記受信器装置からの送信のために前記チャネル状態情報を受信し処理するように構成された送信データプロセッサー。 - さらに下記を具備する、請求項28の受信器装置:
前記変調シンボル推定値に基づいてチャネル係数マトリクスを派生するように構成された第2の推定器、前記第1のマトリクスは、前記チャネル係数マトリクスに基づいて派生される。 - 前記送信チャネル特性の推定値は、信号対雑音プラス干渉推定値を具備する、請求項28の受信器装置。
- さらに下記を具備する、請求項28の受信器装置:
1つ以上の復調エレメント、各復調エレメントは、特定の復調スキームに従って、変調シンボル推定値のそれぞれのストリームを受信して復調し、復調シンボルのストリームを供給するように構成される。 - さらに下記を具備する、請求項31の受信器装置:
1つ以上の復号器、各復号器は、特定の復号スキームに従って復調シンボルのストリームを復号し、復号データを供給するように構成される。
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