JP2011050063A - 時分割複信通信システムのためのチャネル校正 - Google Patents
時分割複信通信システムのためのチャネル校正 Download PDFInfo
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Abstract
【解決手段】パイロットが、それぞれ下りリンク及び上りリンクチャネル上で送信され、下りリンク及び上りリンクチャネル応答の推定値を導き出すために用いられる。次に、補正因子の2つのセットが、下りリンク及び上りリンクチャネル応答の推定値に基づいて確定される。校正された下りリンクチャネルが、下りリンクチャネルのための第1の補正因子のセットを用いて形成され、校正された上りリンクチャネルが、上りリンクチャネルのための第2の補正因子のセットを用いて形成される。第1及び第2の補正因子のセットは、行列比計算または最小平均二乗誤差(MMSE)計算を用いて確定することができる。校正は、無線伝送に基づいてリアルタイムで行うことができる。
【選択図】図2
Description
である。送信/受信チェインと無線チャネルの応答は、一般に周波数の関数である。簡単にするために、フラットフェージングチャネル(すなわち、フラットな周波数応答を有する)を想定する。
である。
校正は、下りリンクチャネルまたは上りリンクチャネルのために「正規化された」ゲインに基づいて行うことができ、それらは受信機におけるノイズフロアに関して得られるゲインである。正規化されたゲインを使うことにより、下りリンクと上りリンクが校正された後、1つのリンクの特性(チャネルゲインと固有モード当りのSNRを含む)を、他のリンクに対するゲイン測定に基づいて得ることが可能になる。
校正のために、MIMOパイロットがユーザー端末により上りリンク上で送信され、アクセスポイントが上りリンクチャネル応答を推定することを可能にし、MIMOパイロットがアクセスポイントにより下りリンク上で送信され、ユーザー端末が下りリンクチャネル応答を推定することを可能にする。同一のまたは異なるMIMOパイロットを下りリンク及び上りリンクのために使うことができ、使われるMIMOパイロットは、アクセスポイントとユーザー端末の両方で識別される。
P(imag)=g・{0,0,0,0,0,0,−1,1,1,1,−1,−1,1,−1,1,1,1,−1,1,−1,−1,−1,−1,−1,−1,1,1,−1,1,1,−1,1,0,−1,−1,−1,−1,1,1,−1,1,−1,−1,1,−1,1,−1,1,1,1,−1,1,1,1,1,1,1,−1,−1,0,0,0,0,0}
ここで、gはパイロットのためのゲインである。{}括弧内の値は、サブ帯域指標−32から−1のため(第1のラインのため)と、0から+31のため(第2のラインのため)に与えられる。したがって、P(real)及びP(imag)のための第1のラインは、シンボル(−1−j)がサブ帯域−26で送信され、シンボル(−1+j)がサブ帯域−25で送信され、以下同様であることを表わす。P(real)及びP(imag)のための第2のラインは、シンボル(1−j)がサブ帯域1で送信され、シンボル(−1−j)がサブ帯域2で送信され、以下同様であることを表わす。他のOFDMシンボルも、MIMOパイロットに使うことができる。
下りリンクチャネル応答と上りリンクチャネル応答との間の相関関係は、TDD MIMOシステム及びMIMO−OFDMシステムのためのアクセスポイント及びユーザー端末でのチャネル推定及び空間処理を簡単にするために利用することができる。この簡略化は、校正が送信/受信チェインにおける差を補償するために行われた後に可能である。上述したように、校正されたチャネル応答は、
下りリンクのために
である。
図5は、TDD MIMO−OFDMシステム内のアクセスポイント502及びユーザー端末504の一実施形態のブロック図である。簡単にするために、以下の説明ではアクセスポイントとユーザー端末がそれぞれ4つの送信/受信アンテナを備えているものとする。
Claims (39)
- 無線通信システムにおいて下りリンクチャネルと上りリンクチャネルを校正する方法であって、
下りリンクチャネル応答の推定値を取得することと、
上りリンクチャネル応答の推定値を取得することと、
前記下りリンクチャネル応答の推定値及び前記上りリンクチャネル応答の推定値に基づいて第1の補正因子のセット及び第2の補正因子のセットを確定することと、
前記第1の補正因子のセット及び前記第2の補正因子のセットに基づいてそれぞれ前記下りリンクチャネルと前記上りリンクチャネルを校正し、校正された下りリンクチャネルと校正された上りリンクチャネルを形成することとを含む方法。 - 前記第1の補正因子のセットは前記下りリンクチャネル上での伝送の前にシンボルをスケーリングするのに用いられ、前記第2の補正因子のセットは前記上りリンクチャネル上での伝送の前にシンボルをスケーリングするのに用いられる請求項1に記載の方法。
- 前記第1の補正因子のセットは前記下りリンクチャネル上で受信したシンボルをスケーリングするのに用いられ、前記第2の補正因子のセットは前記上りリンクチャネル上で受信したシンボルをスケーリングするのに用いられる請求項1に記載の方法。
- さらに、前記下りリンクチャネル応答の推定値と前記上りリンクチャネル応答の推定値との平均差を示すスケーリング値を確定することを含む請求項1に記載の方法。
- 前記下りリンクチャネル応答の推定値と前記上りリンクチャネル応答の推定値は、受信機のノイズフロアを補償するために正規化される請求項1に記載の方法。
- 前記確定することは、ユーザー端末で行われる請求項1に記載の方法。
- 前記下りリンクチャネルのための第1の補正因子の行列のセットは、第1のサブ帯域のセットのために確定され、さらに、
第2のサブ帯域のセットのための前記下りリンクチャネルのための第2の補正因子の行列のセットを取得するために、前記第1の行列のセットを補間する請求項4に記載の方法。 - 前記下りリンクチャネル応答の推定値と前記上りリンクチャネル応答の推定値は、それぞれ複数のアンテナから送信され複数の直交系列で直交化されたパイロットに基づいて取得される請求項1に記載の方法。
- 前記上りリンクチャネル応答の推定値は、前記上りチャネル上で送信されたパイロットに基づいて取得され、前記下りリンクチャネル応答の推定値は、前記下りチャネル上で送信されたパイロットに基づいて取得される請求項1に記載の方法。
- 前記TDDシステムは、多入力多出力(MIMO)システムである請求項1に記載の方法。
- 前記TDDシステムは、直交周波数分割多重(OFDM)を利用する請求項1に記載の方法。
- 無線時分割複信(TDD)多入力多出力(MIMO)通信システムにおける下りリンクチャネルと上りリンクチャネルを校正する方法であって、
前記上りリンクチャネル上でパイロットを送信することと、
前記上りリンクチャネル上で送信された前記パイロットに基づいて導き出された上りリンクチャネル応答の推定値を取得することと、
前記下りリンクチャネル上でパイロットを受信することと、
前記下りリンクチャネル上で受信された前記パイロットに基づいて導き出された下りリンクチャネル応答の推定値を取得することと、
前記下りリンクチャネル応答の推定値と前記上りリンクチャネル応答の推定値に基づいて第1及び第2の補正因子のセットを取得することであり、前記下りリンクチャネルのための前記第1の補正因子のセットを用いて、校正された下りリンクチャネルが形成され、前記上りリンクチャネルのための前記第2の補正因子のセットを用いて、校正された上りリンクチャネルが形成されることとを含む方法。 - 前記第1及び第2の補正因子のセットは、最小平均二乗誤差(MMSE)計算に基づいて確定される請求項18に記載の方法。
- 前記第1及び第2の補正因子のセットは、行列比計算に基づいて確定される請求項18に記載の方法。
- 前記第1の補正因子のセットは、複数のユーザー端末での校正に基づいて更新される請求項18に記載の方法。
- 前記下りリンク上での伝送の前に前記第1の補正因子のセットでシンボルをスケーリングする請求項18に記載の方法。
- 前記上りリンクチャネル上での伝送の前に前記第2の補正因子のセットでシンボルをスケーリングする請求項18に記載の方法。
- 無線時分割複信(TDD)多入力多出力(MIMO)通信システムにおける装置であって、
下りリンクチャネルの応答の推定値を取得する手段と、
上りリンクチャネルの応答の推定値を取得する手段と、
前記下りリンクチャネル応答の推定値と前記上りリンクチャネル応答の推定値に基づいて第1及び第2の補正因子のセットを取得し、前記下りリンクチャネルのための前記第1の補正因子のセットを用いて、校正された下りリンクチャネルが形成され、前記上りリンクチャネルのための前記第2の補正因子のセットを用いて、校正された上りリンクチャネルが形成される装置。 - 無線時分割複信(TDD)通信システムにおけるユーザー端末であって、
上りリンクチャネル上で第1のパイロットを送信するよう機能するTX空間プロセッサと、
下りリンクチャネル上で第2のパイロットを受信し、前記受信した第2のパイロットに基づいて下りリンクチャネル応答の推定値を導き出すとともに、前記送信された第1のパイロットに基づいて導き出された上りリンクチャネル応答の推定値を受信するよう機能するRX空間プロセッサと、
前記下りリンクチャネル応答の推定値と前記上りリンクチャネル応答の推定値に基づいて第1及び第2の補正因子のセットを確定し、前記下りリンクチャネルのための前記第1の補正因子のセットを用いて、校正された下りリンクチャネルが形成され、前記上りリンクチャネルのための前記第2の補正因子のセットを用いて、校正された下りリンクチャネルが形成されるよう機能するコントローラと、
を備えたユーザー端末。 - 前記コントローラは、さらに前記第1及び第2の補正因子のセットを最小平均二乗誤差(MMSE)計算に基づいて確定するよう機能する請求項25に記載のユーザー端末。
- 前記コントローラは、さらに前記第1及び第2の補正因子のセットを行列比計算に基づいて確定するよう機能する請求項25に記載のユーザー端末。
- 無線システムにおける通信のための方法であって、
1つ以上の通信リンクと関連するチャネル応答の推定値から導き出された1つ以上の補正因子のセットに基づいて、複数のユーザー局と1つ以上のアクセスポイントとの間の1つ以上の通信リンクを校正することであり、前記複数のユーザー局は第1のユーザー局と第2のユーザー局を含むことと、
前記第1及び第2のユーザー局の間の校正を行うことなくステアリングを用いて前記第1及び第2のユーザー局の間の通信を確立することと、
を含む方法。 - 前記第1及び第2のユーザー局の間の通信を確立することは、
前記第2のユーザー局との通信リンクを確立するために、パイロットと要求を前記第1のユーザー局から送ることと、
第1のユーザー局からの前記パイロットと前記要求の受信に応じて、ステアリングされたパイロットと肯定応答を前記第2のユーザー局から送ることと、
前記ステアリングされたパイロットに基づいてステアリングを用いて前記第1及び第2のユーザー局の間で情報を送信すること、
とを含む請求項28に記載の方法。 - 前記通信を確立するための要求は、前記第1のユーザー局が属する基本サービスセットの識別子と前記第1のユーザー局の識別子とを含む請求項29に記載の方法。
- 前記肯定応答は、前記第2のユーザー局の識別子、前記第2のユーザー局が属する基本サービスセットの識別子、及びデータレート指標を含む請求項29に記載の方法。
- 前記1つ以上のアクセスポイントは、第1の基本サービスセット(BSS)に関連する第1のアクセスポイントと第2のBSSに関連する第2のアクセスポイントを含み、前記第1のユーザー局は、前記第1のアクセスポイントに対して校正され、前記第2のユーザー局は、前記第2のアクセスポイントに対して校正され、前記第1及び第2のユーザー局の間の通信を確立することは、
前記第2のユーザー局との通信リンクを確立するために、パイロットと要求を前記第1のユーザー局から送ることと、
第1のユーザー局からの前記パイロットと前記要求の受信に応じて、ステアリングされたパイロットと肯定応答を前記第2のユーザー局から送ることと、
異なるアクセスポイントに対する前記第1及び第2のユーザー局の校正により起こる位相回転を補償するよう調整されるステアリングを用いて前記第1及び第2のユーザー局の間で情報を送信することとを含む請求項28に記載の方法。 - 前記位相回転は、前記第2のユーザー局から受信した前記ステアリングされたパイロットに基づいて確定される請求項32に記載の方法。
- 1つ以上の通信リンクに関連するチャネル応答の推定値から導き出される1つ以上の補正因子のセットに基づいて、複数のユーザー局と1つ以上のアクセスポイントとの間の1つ以上の通信リンクを校正する手段であり、前記複数のユーザー局は第1のユーザー局と第2のユーザー局を含む手段と、
前記第1及び第2のユーザー局の間の校正を行うことなくステアリングを用いて前記第1及び第2のユーザー局の間の通信を確立する手段と、
を含む装置。 - 前記第1及び第2のユーザー局の間の通信を確立することは、
前記第2のユーザー局との通信リンクを確立するために、パイロットと要求を前記第1のユーザー局から送る手段と、
第1のユーザー局からの前記パイロットと前記要求の受信に応じて、ステアリングされたパイロットと肯定応答を前記第2のユーザー局から送る手段と、
前記ステアリングされたパイロットに基づいてステアリングを用いて前記第1及び第2のユーザー局の間で情報を送信する手段と、
を含む請求項34に記載の装置。 - 前記通信を確立するための要求は、前記第1のユーザー局が属する基本サービスセットの識別子と前記第1のユーザー局の識別子とを含む請求項35に記載の装置。
- 前記肯定応答は、前記第2のユーザー局の識別子、前記第2のユーザー局が属する基本サービスセットの識別子、及びデータレート指標を含む請求項35に記載の装置。
- 前記1つ以上のアクセスポイントは、第1の基本サービスセット(BSS)に関連する第1のアクセスポイントと第2のBSSに関連する第2のアクセスポイントを含み、前記第1のユーザー局は、前記第1のアクセスポイントに対して校正され、前記第2のユーザー局は、前記第2のアクセスポイントに対して校正され、前記第1及び第2のユーザー局の間の通信を確立することは、
前記第2のユーザー局との通信リンクを確立するために、パイロットと要求を前記第1のユーザー局から送ることと、
第1のユーザー局からの前記パイロットと前記要求の受信に応じて、ステアリングされたパイロットと肯定応答を前記第2のユーザー局から送ることと、
異なるアクセスポイントに対する前記第1及び第2のユーザー局の校正により起こる位相回転を補償するよう調整されるステアリングを用いて前記第1及び第2のユーザー局の間で情報を送信することとを含む請求項34に記載の装置。 - 前記位相回転は、前記第2のユーザー局から受信した前記ステアリングされたパイロットに基づいて確定される請求項38に記載の装置。
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TW200417176A (en) | 2004-09-01 |
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CN1751484B (zh) | 2010-08-11 |
EP2166688A2 (en) | 2010-03-24 |
EP2357769A3 (en) | 2013-05-08 |
CN1751484A (zh) | 2006-03-22 |
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EP2166688B1 (en) | 2020-03-18 |
JP2010193477A (ja) | 2010-09-02 |
AU2003287293B2 (en) | 2009-04-23 |
JP5528867B2 (ja) | 2014-06-25 |
MXPA05004391A (es) | 2005-07-26 |
CA2502801A1 (en) | 2004-05-06 |
TWI363515B (en) | 2012-05-01 |
US8750151B2 (en) | 2014-06-10 |
EP2357769A2 (en) | 2011-08-17 |
EP2166688A3 (en) | 2010-03-31 |
AU2003287293C1 (en) | 2009-09-24 |
WO2004039022A2 (en) | 2004-05-06 |
AU2003287293A1 (en) | 2004-05-13 |
EP2357769B1 (en) | 2017-12-06 |
BR0315538A (pt) | 2006-01-17 |
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