JP5632432B2 - Mimo−ofdmシステムにおいて空間周波数ブロック符号化、空間多重化、およびビーム形成を組み合わせる方法および装置 - Google Patents
Mimo−ofdmシステムにおいて空間周波数ブロック符号化、空間多重化、およびビーム形成を組み合わせる方法および装置 Download PDFInfo
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- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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Description
ここで、UおよびVはユニタリ行列であり、Dは対角行列である。U∈CnRxnRおよびV∈CnTxnTである。次いで、送信シンボルベクトルsに対して、送信事前符号化は単に以下のように実行される。
受信された信号は以下のようになる。
ここでnは、チャネルに発生したノイズである。受信機は、整合フィルタを使用することにより分解を完結する。
固有ビームのチャネルゲインを正規化した後、送信シンボルsの推定は以下のようになる。
または使用せずに様々な組合せで使用されうる。
Claims (6)
- 送信機であって、
複数のモードを用いて選択的に送信するように構成された回路を備え、
前記複数のモードの第1のモードにおいて、データシンボルは、空間周波数ブロック符号化(SFBC)を用いて送信され、前記データシンボルのペアの各々は、SFBCで符号化されて、4つのアンテナのうちの2つのアンテナであって前記4つのアンテナのうちの他の2つではないアンテナにより、送信され、前記データシンボルの第1のペアは、前記4つのアンテナのうちの第1のアンテナおよび第2のアンテナにより送信され、前記データシンボルの第2のペアは、前記4つのアンテナのうちの第3のアンテナおよび第4のアンテナにより送信され、
前記複数のモードの第2のモードにおいて、前記回路は、受信機からチャネル状態情報(CSI)を受信するようにさらに構成され、前記CSIはサブキャリアの複数のグループの各々についての変調及び符号化方式を含み、前記CSIの情報に応答して、前記回路は多入力多出力(MIMO)空間多重を用いる送信のためのストリームの数を決定するようにさらに構成され、前記回路は、MIMO空間多重を用いるストリームの前記決定された数でデータシンボルを送信するように構成されたことを特徴とする送信機。 - 前記回路は、第3のモードにおいてデータシンボルを送信するようにさらに構成されており、前記データシンボルは、単一入力単一出力(SISO)を用いて送信される、ことを特徴とする請求項1に記載の送信機。
- 受信機であって、
複数のモードを用いて選択的にデータシンボルを受信するように構成された回路を備え、
前記複数のモードの第1のモードにおいて、データシンボルは、空間周波数ブロック符号化(SFBC)を用いて受信され、前記データシンボルのペアの各々は、SFBCで符号化されており、4つの送信アンテナのうちの2つのアンテナであって前記4つの送信アンテナのうちの他の2つではない送信アンテナから、受信され、前記データシンボルの第1のペアは、前記4つの送信アンテナのうちの第1の送信アンテナおよび第2の送信アンテナにより送信され、前記データシンボルの第2のペアは、前記4つの送信アンテナのうちの第3の送信アンテナおよび第4の送信アンテナにより送信され、
前記複数のモードの第2のモードにおいて、前記回路は、送信機へチャネル状態情報(CSI)を送信するようにさらに構成され、前記CSIはサブキャリアの複数のグループの各々についての変調及び符号化方式を含み、前記CSIの情報に応答して、前記回路は多入力多出力(MIMO)空間多重を用いていくつかのストリームで受信するように構成されたことを特徴とする受信機。 - 前記回路は、第3のモードにおいてデータシンボルを受信するようにさらに構成されており、前記データシンボルは、単一入力単一出力(SISO)を用いて受信される、ことを特徴とする請求項3に記載の受信機。
- 方法であって、
受信機が、複数のモードを用いてデータシンボルを選択的に受信すること、を含み、
前記複数のモードの第1のモードにおいて、データシンボルは、空間周波数ブロック符号化(SFBC)を用いて受信され、前記データシンボルのペアの各々は、SFBCで符号化されており、4つの送信アンテナのうちの2つの送信アンテナであって前記4つの送信アンテナのうちの他の2つではない送信アンテナから、受信され、前記データシンボルの第1のペアは、前記4つの送信アンテナのうちの第1の送信アンテナおよび第2の送信アンテナにより送信され、前記データシンボルの第2のペアは、前記4つの送信アンテナのうちの第3の送信アンテナおよび第4の送信アンテナにより送信され、
前記複数のモードの第2のモードにおいて、前記受信機が、送信機へチャネル状態情報(CSI)を送信し、前記CSIはサブキャリアの複数のグループの各々についての変調及び符号化方式を含み、前記CSIの情報に応答して、前記受信機が、多入力多出力(MIMO)空間多重を用いていくつかのストリームで受信する
ことを特徴とする方法。 - 第3のモードにおいて、データシンボルは、単一入力単一出力(SISO)を用いて受信されることを特徴とする請求項5に記載の方法。
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US11/254,358 US8130855B2 (en) | 2004-11-12 | 2005-10-20 | Method and apparatus for combining space-frequency block coding, spatial multiplexing and beamforming in a MIMO-OFDM system |
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CN100340077C (zh) * | 2005-11-29 | 2007-09-26 | 东南大学 | 多天线无线传输系统中信道环境自适应传输方法 |
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