JP4252573B2 - アレーアンテナ通信装置およびアレーアンテナ通信装置のキャリブレーション方法 - Google Patents
アレーアンテナ通信装置およびアレーアンテナ通信装置のキャリブレーション方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/18—Monitoring during normal operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/19—Self-testing arrangements
Description
wi[n+1]=wi[n]+μe*[n]xi[n] (2)
但し、wi[n]:ブランチiの時刻nにおけるキャリブレーション用複素係数
xi[n]:ブランチiの時刻nにおける送信ベースバンド信号
αi:ブランチiにおける振幅・位相偏差(狭帯域)
μ:ステップサイズ
e[n]:時刻nにおける誤差信号(=r[n]−y[n])
e*[n]:上記誤差信号の複素共役
はじめに、本発明の実施の形態1について説明する。第1図は、本発明のアレーアンテナ通信装置の実施の形態1の構成を示すブロック図である。第1図に示すアレーアンテナ通信装置1は、4本のアンテナ2(2a〜2d)と、4つのアンテナブランチ3(3a〜3d)を備えた構成例である。このような基本構成に加えて、適用制御アルゴリズムによるキャリブレーション処理を行うキャリブレーション処理部4を備えている。以下、一つのアンテナブランチ3aについて構成を説明する。
次に、本発明の実施の形態2について説明する。本発明のアレーアンテナ通信装置の実施の形態2の構成は、実施の形態1と同様であり、スイッチ切り替えの制御と演算処理が異なる。この実施の形態2では、各ブランチの送信ベースバンド信号のオン/オフを制御するスイッチ6は、ブランチi≦ブランチ数Nのとき、ブランチ1〜iのスイッチ6をオンにし、ブランチi+1〜Nのスイッチ6をオフに設定する。そして、信号を送信するブランチの数を1ブランチずつ増加するようにスイッチ6を制御する。これにより、ブランチiの初期キャリブレーションの段階では、ブランチ1〜i−1のキャリブレーションは終了している。したがって、ブランチ1〜iのスイッチ6を同時にオンにしても、キャリブレーションされていないブランチはブランチiのみであるため、ブランチiの送信ベースバンド信号を参照信号として選択し(r[n]=xi [n])、下式(4)のようにフィードバック信号を操作することにより、フィードバック信号はブランチiの成分のみとなる。
を新たなフィードバック信号fbとする(ステップS14)。
次に、本発明の実施の形態3について説明する。第4図は、本発明のアレーアンテナ通信装置の実施の形態3の構成を示すブロック図である。この実施の形態3において実施の形態1と同様の構成部には同一の符号を附してある。この実施の形態3では、送信ベースバンド信号の位相を回転させる位相回転手段20を新たに設けた点が異なる。
次に、本発明の実施の形態4について説明する。第6図は、本発明のアレーアンテナ通信装置の実施の形態4の構成を示すブロック図である。この実施の形態4において実施の形態1と同様の構成部には同一の符号を附してある。この実施の形態4では、既知のキャリブレーション信号を用いて複数のアンテナブランチ3を同時にキャリブレーションする構成である。
y2=x[n]α1−x[n]α2+x[n]α3=x[n](α1−α2+α3)
y3=x[n]α1+x[n]α2−x[n]α3=x[n](α1+α2−α3)(7)と表現できるので、α1 ,α2 ,α3 は、下式(8)を用いて算出できる。
次に、本発明の実施の形態5について説明する。第8図は、本発明のアレーアンテナ通信装置の実施の形態5の構成を示すブロック図である。また、第9図は、実施の形態5の構成における各部の信号成分を示す図表である。この実施の形態5において実施の形態1と同様の構成部には同一の符号を附してある。この実施の形態5では、各ブランチの送信信号を異なる周波数にシフトさせることにより、複数のブランチを同時にキャリブレーションする構成である。
次に、本発明の実施の形態6について説明する。第10図は、本発明のアレーアンテナ通信装置の実施の形態6の構成を示すブロック図である。前述した実施の形態5の構成は、全ブランチの初期キャリブレーションを同時に行うことができる構成であったが、ハードウェア規模が大きくなる。特に、実施の形態5(第8図記載)の構成では、キャリブレーション処理部4には、ブランチ数と同じ数の周波数シフタ42(42a〜42d)と、ディジタルフィルタ43(43a〜43d)を設ける必要があった。この実施の形態6では、フィードバックループに設けられるキャリブレーション処理部4は、各ブランチから送信された信号成分を抽出するために行う周波数シフトを時分割制御し、可変周波数シフタ45を用いる構成としている。これにより、一つの可変周波数シフタ45と、一つのディジタルフィルタ43を用いて構成の簡略化を図ったものである。
次に、本発明の実施の形態7について説明する。第12図は、本発明のアレーアンテナ通信装置の実施の形態7の構成を示すブロック図である。また、第13図は、実施の形態7の構成における各部の信号成分を示す図表である。実施の形態6に記載の構成では、各ブランチの送信ベースバンド信号に加える周波数シフト量は、ブランチ毎には異なるものの、時間的には不変である。これに対し、この実施の形態7では、各ブランチにおけるフォワード系の周波数シフト量を時間的に変化させる機能をもたせることにより、ブランチ毎のキャリブレーションを時分割で行うものである。このため、送信ベースバンド信号生成部5から送信される送信ベースバンド信号の中心周波数を可変させる可変周波数シフタ47を備え、スイッチ41の切り替えにより可変周波数シフタ47の出力に切り替え自在な構成としている。可変周波数シフタ47の周波数シフト量は、適応制御部16が出力する周波数設定信号ctl−fにより設定される。
Claims (10)
- 複数のアンテナブランチとアレーアンテナを備えたアレーアンテナ通信装置において、
前記複数のアンテナブランチにそれぞれ設けられた無線送信手段が有する振幅または位相偏差をキャンセルするキャリブレーション用補正値を、通信時に送信信号とフィードバック信号とに基づき適応制御アルゴリズムにより算出する適応制御キャリブレーション処理に、必要な初期値を非通信時に算出するキャリブレーション処理手段を備え、
前記複数のアンテナブランチには、それぞれのアンテナブランチからベースバンド信号の送信の有無を切り替える切替手段を備え、
前記キャリブレーション処理手段は、前記切替手段を制御して、ベースバンド信号を送信させるアンテナブランチを一つずつ増加させ、該増加した一つのアンテナブランチから送信されたベースバンド信号を参照信号とし、前記無線送信手段を介してアップコンバートされた複数のアンテナブランチの信号の和から、既に初期値が算出されたアンテナブランチの信号成分を減算することで、増加した一つのアンテナブランチから送信された信号をフィードバック信号として得て、前記参照信号とフィードバック信号とに基づき、前記増加したアンテナブランチの前記初期値を算出することを特徴とするアレーアンテナ通信装置。 - 複数のアンテナブランチとアレーアンテナを備えたアレーアンテナ通信装置において、
前記複数のアンテナブランチにそれぞれ設けられた無線送信手段が有する振幅または位相偏差をキャンセルするキャリブレーション用補正値を、通信時に送信信号とフィードバック信号とに基づき適応制御アルゴリズムにより算出する適応制御キャリブレーション処理に、必要な初期値を非通信時に算出するキャリブレーション処理手段と、
前記複数のアンテナブランチには、それぞれのアンテナブランチから送信するベースバンド信号の位相を可変させる位相可変手段を備え、
前記キャリブレーション処理手段は、前記位相可変手段を制御して、複数のアンテナブランチのうち一つのアンテナブランチのベースバンド信号の位相を可変させ、該ベースバンド信号を参照信号とし、前記無線送信手段を介してアップコンバートされた複数のアンテナブランチの信号の和をフィードバック信号として、前記参照信号と前記フィードバック信号の誤差が最小となるときの位相を、前記位相を可変させたアンテナブランチの前記初期値とすることを特徴とするアレーアンテナ通信装置。 - 前記可変位相手段は、前記送信するベースバンド信号の位相を所定の固定量ずつ回転させることを特徴とする請求項2に記載のアレーアンテナ通信装置。
- 前記キャリブレーション処理手段は、前記位相可変手段を制御し、前記送信するベースバンド信号の位相を前記固定量で回転させて前記初期値を求めた後、該初期値を求めた際の位相の回転角度を基準として前後所定角度の範囲の位相を連続的に回転させて前記誤差が最小となる位相により前記初期値を再度求めることを特徴とする請求項2に記載のアレーアンテナ通信装置。
- 複数のアンテナブランチとアレーアンテナを備えたアレーアンテナ通信装置において、
前記複数のアンテナブランチにそれぞれ設けられた無線送信手段が有する振幅または位相偏差をキャンセルするキャリブレーション用補正値を、通信時に送信信号とフィードバック信号とに基づき適応制御アルゴリズムにより算出する適応制御キャリブレーション処理に、必要な初期値を非通信時に算出するキャリブレーション処理手段と、
キャリブレーション用の信号として既知のベースバンド信号を前記各アンテナブランチに供給する既知キャリブレーション信号発生手段と、
前記複数のアンテナブランチにそれぞれ設けられ、前記既知キャリブレーション信号発生手段により供給される前記ベースバンド信号の位相を反転させる位相反転手段とを備え、
前記キャリブレーション処理手段は、前記既知キャリブレーション信号発生手段から前記既知のベースバンド信号を複数のアンテナブランチ全てに供給し、該供給の際に順次アンテナブランチを選択して、該選択したアンテナブランチには前記既知のベースバンド信号を位相反転して供給し、前記既知のベースバンド信号を参照信号とし、前記無線送信手段を介してアップコンバートされた複数のアンテナブランチの信号の和によるフィードバック信号を、位相反転対象のアンテナブランチを切り替えて複数得て、当該複数のフィードバック信号と前記参照信号とに基づき、全てのアンテナブランチにおける前記初期値を同時に算出することを特徴とするアレーアンテナ通信装置。 - 複数のアンテナブランチとアレーアンテナを備えたアレーアンテナ通信装置のキャリブレーション方法において、
前記複数のアンテナブランチにそれぞれ設けられた無線送信手段が有する振幅や位相偏差をキャンセルするキャリブレーション用補正値を、通信時に送信信号とフィードバック信号とに基づき適応制御アルゴリズムにより算出する適応制御キャリブレーション処理に、必要な初期値を非通信時に算出するキャリブレーション処理工程を含み、
前記キャリブレーション処理工程は、前記ベースバンド信号を送信させるアンテナブランチを一つずつ増加させ、該増加した一つのアンテナブランチから送信されたベースバンド信号を参照信号とし、前記無線送信手段を介してアップコンバートされた複数のアンテナブランチの信号の和から、既に初期値が算出されたアンテナブランチの信号成分を減算することで、増加した一つのアンテナブランチから送信された信号をフィードバック信号として得て、前記参照信号とフィードバック信号とに基づき、前記増加したアンテナブランチの前記初期値を算出することを特徴とするアレーアンテナ通信装置のキャリブレーション方法。 - 複数のアンテナブランチとアレーアンテナを備えたアレーアンテナ通信装置のキャリブレーション方法において、
前記複数のアンテナブランチにそれぞれ設けられた無線送信手段が有する振幅や位相偏差をキャンセルするキャリブレーション用補正値を、通信時に送信信号とフィードバック信号とに基づき適応制御アルゴリズムにより算出する適応制御キャリブレーション処理に、必要な初期値を非通信時に算出するキャリブレーション処理工程を含み、
前記キャリブレーション処理工程は、
前記複数のアンテナブランチのうち一つのアンテナブランチのベースバンド信号の位相を可変させる位相可変工程を含み、
該ベースバンド信号を参照信号とし、前記無線送信手段を介してアップコンバートされた複数のアンテナブランチの信号の和をフィードバック信号として、該参照信号と該フィードバック信号の誤差が最小となるときの位相を、前記位相を可変させたアンテナブランチの前記初期値とすることを特徴とするアレーアンテナ通信装置のキャリブレーション方法。 - 前記位相可変工程は、前記送信するベースバンド信号の位相を所定の固定量ずつ回転させることを特徴とする請求項7に記載のアレーアンテナ通信装置のキャリブレーション方法。
- 前記キャリブレーション処理工程は、前記送信するベースバンド信号の位相を前記固定量で回転させて前記初期値を求めた後、該初期値を求めた際の位相の回転角度を基準として前後所定角度の範囲の位相を連続的に回転させて前記誤差が最小となる位相により前記初期値を再度求めることを特徴とする請求項7に記載のアレーアンテナ通信装置のキャリブレーション方法。
- 複数のアンテナブランチとアレーアンテナを備えたアレーアンテナ通信装置のキャリブレーション方法において、
前記複数のアンテナブランチにそれぞれ設けられた無線送信手段が有する振幅や位相偏差をキャンセルするキャリブレーション用補正値を、通信時に送信信号とフィードバック信号とに基づき適応制御アルゴリズムにより算出する適応制御キャリブレーション処理に、必要な初期値を非通信時に算出するキャリブレーション処理工程を含み、
前記キャリブレーション処理工程は、
キャリブレーション用の信号として既知のベースバンド信号を前記各アンテナブランチに供給する既知キャリブレーション信号供給工程を含み、
前記複数のアンテナブランチ全てに前記既知のベースバンド信号を供給し、該供給の際に順次アンテナブランチを選択して、該選択したアンテナブランチには前記既知のベースバンド信号を位相反転して供給し、前記既知のベースバンド信号を参照信号とし、前記無線送信手段を介してアップコンバートされた複数のアンテナブランチの信号の和によるフィードバック信号を、位相反転対象のアンテナブランチを切り替えて複数得て、当該複数のフィードバック信号と前記参照信号とに基づき、全てのアンテナブランチにおける前記初期値を同時に算出することを特徴とするアレーアンテナ通信装置のキャリブレーション方法。
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EP1630976A1 (en) | 2006-03-01 |
JPWO2004109952A1 (ja) | 2006-07-20 |
US20050239419A1 (en) | 2005-10-27 |
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