JP2010283864A - システム性能向上のためのチャネルサウンディング - Google Patents
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Abstract
【解決手段】送信機が、低速信号を生成して、対象受信機に送信する。受信機は、CSRを生成して送信する。CSRは、予め決定された送信フォーマットを有し、所定の情報を搬送する短いバーストである。次に、送信機は、CSRを分析してアップリンクチャネル応答を決定し、ダウンリンクチャネル応答を推定し、かつ、分析とダウンリンク応答推定に基づいて適切な送信パラメータ設定を決定する。送信パラメータの調整は、MAC層、PHY層において行うことができる。送信パラメータを調整し、その決定した送信設定に従ってユーザデータを副搬送波に変調した後、送信機は好適な帯域幅部分でそのユーザデータを受信機に送信する。さらに、副搬送波変調情報を含む決定した送信パラメータ設定を含む送信フォーマットTFC信号を生成するようにしてもよい。
【選択図】図2
Description
Claims (19)
- 多入力多出力(MIMO)直交周波数分割多重(OFDM)無線通信システムにおけるシステム性能を向上させる方法において、
(a)送信機および受信機の間で送受信されるチャネルサウンディング応答(CSR)信号を監視すること、
(b)前記送信機および前記受信機の間の通信リンクのチャネル状態を評価すること、
(c)前記チャネル状態の履歴を保持すること、
(d)前記チャネル状態の履歴に基づいて、送信パラメータを調整すること、
(e)前記調整された送信パラメータを用いて、前記送信機および前記受信機と通信すること
を備えることを特徴とする方法。 - 多入力多出力(MIMO)直交周波数分割多重(OFDM)無線通信システムで用いる送信機であって、
(a)低速信号を生成し、かつ受信したチャネルサウンディング応答(CSR)信号を解析するためのチャネルサウンディング処理装置と、
(b)前記解析に基づいて、送信パラメータ設定を決定する第1の処理装置と、
(c)前記決定された設定に従って、送信パラメータを調整する第2の処理装置と、
(d)前記決定された設定に従って、ユーザデータを副搬送波に変調する物理(PHY)層処理装置と、
(e)前記CSR信号を受信し、かつ前記調整された送信パラメータに従って前記ユーザデータを送信する複数の送受信アンテナと
を備えることを特徴とする送信機。 - 前記第1および第2の処理装置は、媒体アクセス制御(MAC)層処理装置であることを特徴とする請求項2に記載の送信機。
- 前記第1の処理装置はMAC層処理装置であり、前記第2の処理装置はPHY層処理装置であることを特徴とする請求項2に記載の送信機。
- 前記第1および第2の処理装置は、PHY層処理装置であることを特徴とする請求項2に記載の送信機。
- 前記PHY層処理装置は、チャネル容量最適化技術を用いて前記ユーザデータを前記副搬送波に変調することを特徴とする請求項2に記載の送信機。
- 前記チャネル容量最適化技術は、注水(water-filling)であることを特徴とする請求項6に記載の送信機。
- 前記PHY層処理装置は、チャネル信頼性最適化技術を用いて前記ユーザデータを前記副搬送波に変調することを特徴とする請求項2に記載の送信機。
- 前記チャネル信頼性最適化技術は、電力制御であることを特徴とする請求項8に記載の送信機。
- 決定された送信パラメータ設定を格納するためのメモリコンポーネントをさらに備え、
前記メモリコンポーネントは、前記格納された送信パラメータ設定に従って後にユーザデータを送信するために用いられる
ことを特徴とする請求項2に記載の送信機。 - 送信フォーマット制御(TFC)信号を生成するTFC処理装置をさらに備え、
前記TFC信号は、副搬送波変調情報を含む決定した送信パラメータ設定を含む
ことを特徴とする請求項2に記載の送信機。 - (a)第2の送信機および受信機の間で送受信されるCSR信号を監視する信号監視処理装置と、
(b)自身および前記受信機の間で通信リンクのチャネル状態を評価するように構成された信号分析器と、
(c)前記チャネル状態の履歴を保持する第2のメモリコンポーネントと、
(d)前記チャネル状態の履歴に基づいて送信パラメータを調整する調整処理装置と
をさらに備え、
前記受信機および前記第2の送信機との通信は、前記調整された送信パラメータを用いて実行されることを特徴とする請求項2に記載の送信機。 - 前記送信機は、無線送受信ユニット(WTRU)であることを特徴とする請求項2に記載の送信機。
- 前記送信機は、基地局であることを特徴とする請求項2に記載の送信機。
- (a)受信した低速信号を処理し、かつ、応答CSR信号であって、各々、予め定義された送信フォーマットを有し、所定の情報を搬送する短いバーストである前記CSR信号を生成するチャネルサウンディング処理装置と、
(b)前記低速信号を受信し、かつ前記応答CSR信号を送信する複数の送受信アンテナと、
(c)ユーザデータを符号化した副搬送波を処理するデータパケット処理装置と、
を備える
ことを特徴とするMIMO−OFDM無線通信システムにおいて使用する受信機。 - (a)副搬送波変調情報を含む受信したデータパケットの送信パラメータ設定を含む受信したTFC信号を処理するTFC処理装置と、
(b)前記TFC信号により提供される情報に基づいて、ユーザが符号化した副搬送波を復号及び復調するよう構成されたデータパケット処理装置と、
をさらに備える
ことを特徴とする請求項15に記載の受信機。 - (a)送信機と第2受信機との間で送受信されるCSR信号を監視する信号監視処理装置と、
(b)前記送信機と第2受信機との間の通信リンクのチャネル状態を評価するよう構成された信号分析器と、
(c)前記チャネル状態の履歴を保持するメモリコンポーネントと、
(d)前記チャネル状態の履歴に基づいて送信パラメータを調整する調整処理装置と、 をさらに備え、
前記送信機および前記第2の受信機との通信は、前記調整された送信パラメータを用いて実行されることを特徴とする請求項16に記載の受信機。 - 前記受信機は、WTRUであることを特徴とする請求項17に記載の受信機。
- 前記受信機は、基地局であることを特徴とする請求項17に記載の受信機。
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