JP2011507359A - キャリア間干渉が限定された無線通信ネットワークのチャネル推定方法及びシステム - Google Patents
キャリア間干渉が限定された無線通信ネットワークのチャネル推定方法及びシステム Download PDFInfo
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Abstract
Description
(a)周波数オフセット仮説値を決定するステップと、
(b)前記周波数オフセット仮説値に基づきチャネル間干渉(ICI)行列を生成するステップと、
(c)前記ICI行列に基づきパイロットチャネル推定値を取得するステップと、
(d)前記周波数オフセット仮説値に対する前記パイロットチャネル推定値の相関誤差を計算するステップと、
(e)前記相関誤差と所定の相関誤差値とを比較するステップと、
(f)前記周波数オフセット仮説値を更新し、前記相関誤差が前記所定の相関誤差値より大きい場合、ステップ(a)〜(e)を繰り返すステップと、
(g)前記パイロットチャネル推定値を用いて無線通信チャネルを推定するステップと、
を実行する。
[OFDMシンボルにおけるICIモデリング]
OFDMA送信機24は、シリアルデータストリームをサイズNのパラレルなブロックに変換し、逆離散フーリエ変換(IDFT)を用いてOFDMAシンボルを生成するため、これらのブロックを変調する。時間ドメインサンプルは、
[繰り返しサーチ処理の計算負荷を低減するための本発明のICIモデルの性質]
本発明の推定方法の計算負荷を低減するため利用可能な干渉行列のいくつかの性質がある。これらの性質は以下のように説明される。
[周波数オフセット及びチャネルのジョイント推定方法]
式(3)の干渉行列Sεpが受信機においてわかっている場合、受信ベクトルyと当該行列の共役転置とを予め乗算することは、受信したOFDM信号におけるICIを完全に排除し、チャネル周波数応答(CFR)ベクトルの正確な推定が可能となる。しかしながら、干渉行列Sεpは一般には受信機38に知らされていない。それは、無線チャネルにおけるモビリティから生じる未知のキャリア周波数オフセットに依存するためである。
[周波数オフセット及びチャネルのLMSサーチ技術]
周波数オフセット仮説値の収束を実現するため、サーチ方法及び対応する基準が利用される。本発明の周波数オフセットサーチ方法は、適応的最小二乗(LMS)技術に基づく実際的実現形態又は最適勾配サーチに基づく。一般に、LMS技術は既知であり、ここでは説明されない。サーチ基準は、パイロットチャネル周波数相関の最大化である。本発明のLMS方法は、周波数オフセット仮説値の収束を実現するため、勾配に基づく最急降下法である。本発明のLMS方法は、勾配ベクトルの負の方向への周波数オフセット仮説値に連続的な訂正を行う繰り返し処理を含める。これは、最終的には推定値の最小二乗誤差を導く。
ただし、
Error! Objects cannot be created from editing field codes
は、LMSサーチの(n+1)番目の繰り返しのための周波数オフセット仮説値であり、
Error! Objects cannot be created from editing field codes
は、LMSサーチの前のn番目の繰り返しにおいて用いられた周波数オフセット仮説値であり、
Error! Objects cannot be created from editing field codes
は、勾配パラメータであり、
Error! Objects cannot be created from editing field codes
は、周波数相関誤差である。式(8)の後者の部分、すなわち、
Error! Objects cannot be created from editing field codes
は、各繰り返しにより更新されるコンポーネント(Δεhとも呼ばれる)である。
Claims (20)
- 無線通信チャネル推定方法であって、
(a)周波数オフセット仮説値を決定するステップと、
(b)前記周波数オフセット仮説値に基づきチャネル間干渉(ICI)行列を生成するステップと、
(c)前記ICI行列に基づきパイロットチャネル推定値を取得するステップと、
(d)前記周波数オフセット仮説値に対する前記パイロットチャネル推定値の相関誤差を計算するステップと、
(e)前記相関誤差と所定の相関誤差値とを比較するステップと、
(f)前記周波数オフセット仮説値を更新し、前記相関誤差が前記所定の相関誤差値より大きい場合、ステップ(a)〜(e)を繰り返すステップと、
(g)前記パイロットチャネル推定値を用いて無線通信チャネルを推定するステップと、
を有する方法。 - 前記無線通信チャネルは、OFDMAチャネルである、請求項1記載の方法。
- パイロットを有する各OFDMシンボルに対して、ステップ(a)〜(g)が繰り返される、請求項2記載の方法。
- 前記相関は、1の相関ラグに基づく、請求項1記載の方法。
- 前記ICI行列に基づきパイロットチャネル推定値を取得するステップは、
前記ICI行列とパイロットシンボル対角行列との積の逆行列を生成するステップと、
前記逆行列と受信したベースバンドベクトルとを予め乗算するステップと、
を有する、請求項1記載の方法。 - 前記周波数オフセット仮説値を更新するステップは、パイロットチャネル周波数相関を最大化する最小二乗法に基づく、請求項1記載の方法。
- 前記周波数オフセット仮説値を更新するステップは、更新された周波数オフセットコンポーネントを前記周波数オフセット仮説値に加えることを含む、請求項1記載の方法。
- 前記更新された周波数オフセットコンポーネントは、勾配パラメータと周波数相関誤差コンポーネントとを含む、請求項7記載の方法。
- 前記ICI行列は、前記無線通信チャネルのサブキャリア間の漏れに対応する、請求項1記載の方法。
- 前記チャネル推定は、チャネル品質インジケータ(CQI)を確定するのに利用され、
当該方法はさらに、前記CQIに基づき変調符号化方式を選択するステップを有する、請求項1記載の方法。 - 無線通信信号の無線通信チャネル推定システムであって、
前記無線通信信号を受信するアンテナと、
前記アンテナと通信する受信機と、
を有し、
前記受信機は、
(a)周波数オフセット仮説値を決定するステップと、
(b)前記周波数オフセット仮説値に基づきチャネル間干渉(ICI)行列を生成するステップと、
(c)前記ICI行列に基づきパイロットチャネル推定値を取得するステップと、
(d)前記周波数オフセット仮説値に対する前記パイロットチャネル推定値の相関誤差を計算するステップと、
(e)前記相関誤差と所定の相関誤差値とを比較するステップと、
(f)前記周波数オフセット仮説値を更新し、前記相関誤差が前記所定の相関誤差値より大きい場合、ステップ(a)〜(e)を繰り返すステップと、
(g)前記パイロットチャネル推定値を用いて無線通信チャネルを推定するステップと、
を実行するシステム。 - 前記無線通信チャネルは、OFDMAチャネルである、請求項11記載のシステム。
- パイロットを有する各OFDMシンボルに対して、前記受信機は、ステップ(a)〜(g)を繰り返す、請求項12記載のシステム。
- 前記相関は、1の相関ラグに基づく、請求項11記載のシステム。
- 前記受信機は、
前記ICI行列とパイロットシンボル対角行列との積の逆行列を生成するステップと、
前記逆行列と受信したベースバンドベクトルとを予め乗算するステップと、
を少なくとも実行することによって、前記ICI行列に基づきパイロットチャネル推定値を取得する、請求項11記載のシステム。 - 前記受信機は、パイロットチャネル周波数相関を最大化する最小二乗構成を用いて前記周波数オフセット仮説値を更新する、請求項11記載のシステム。
- 前記受信機は、少なくとも更新された周波数オフセットコンポーネントを前記周波数オフセット仮説値に加えることによって、前記周波数オフセット仮説値を更新する、請求項11記載のシステム。
- 前記更新された周波数オフセットコンポーネントは、勾配パラメータと周波数相関誤差コンポーネントとを含む、請求項17記載のシステム。
- 前記ICI行列は、前記無線通信チャネルのサブキャリア間の漏れに対応する、請求項11記載のシステム。
- 前記チャネル推定は、チャネル品質インジケータ(CQI)を確定するのに利用される、請求項11記載のシステム。
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GB0724208A GB2455530B (en) | 2007-12-12 | 2007-12-12 | Channel estimation method and system for inter carrier interference-limited wireless communication networks |
GB0724208.4 | 2007-12-12 | ||
PCT/CA2008/002166 WO2009073974A1 (en) | 2007-12-12 | 2008-12-11 | Channel estimation method and system for inter-carrier interference-limited wireless communication network |
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