JP5043961B2 - 中継器送信機漏れキャンセルシステムにおいて用いられる時間等化器重みの閉形式計算 - Google Patents
中継器送信機漏れキャンセルシステムにおいて用いられる時間等化器重みの閉形式計算 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
- H04B7/15585—Relay station antennae loop interference reduction by interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
- H04B7/15571—Relay station antennae loop interference reduction by signal isolation, e.g. isolation by frequency or by antenna pattern, or by polarization
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Description
本特許出願は、“ADAPTIVE SAME FREQUENCY REPEATER TECHNIQUES”(適応同一周波数中継器技法)という題名を有し、参照されることによって全体がここに組み入れられている、米国仮特許出願一連番号60/904,368(出願日:2007年3月2日)に対する優先権を主張するものである。
“PHYSICAL LAYER REPEATER UTILIZING REAL TIME MEASUREMENT METRICS AND ADAPTIVE ANTENNA ARRAY TO PROMOTE SIGNAL INTEGRITY AND AMPLIFICATION”(信号の完全性及び増幅を向上させるためにリアルタイム測定メトリック及び適応アンテナアレイを利用する物理層中継器)、Attorney Docket Number080603U1、一連番号XX/XXX,XXX;“USE OF A FILTERBANK IN AN ADAPTIVE ON-CHANNEL REPEATER UTILIZING ADAPTIVE ANTENNA ARRAYS”(適応アンテナアレイを利用する適応オンチャネル中継器におけるフィルタバンクの使用)、AttorneyDocket No.080603U3、一連番号XX/XXX,XXX;“USE OF ADAPTIVE ANTENNA ARRAY IN CONJUNCTION WITH AN ON-CHANNEL REPEATER TO IMPROVE SIGNAL QUALITY”(信号品質を向上させるためのオンライン中継器と連携した適応アンテナアレイの使用)、Attorney Docket No.080603U4、一連番号XX/XXX,XXX;“AUTOMATIC GAIN CONTROL AND FILTERING TECHNIQUES FOR USE IN ON-CHANNEL REPEATER”(オンチャネル中継器において用いるための自動利得制御及びフィルタリング技法)、Attorney Docket No.080603U5、一連番号XX/XXX,XXX;“CONFIGURATION OF A REPEATER”(中継器構成)、Attorney Docket No.080603U6、一連番号XX/XXX,XXX、及び“SUPERIMPOSED COMPOSITE CHANNEL FILTER”(スーパーインポーズされた複合チャネルフィルタ)、Attorney Docket No.080603U7、一連番号XX/XXX,XXX、に関連し、各々の特許出願の内容は、その全体が参照されることによってここによって組み入れられている。
関連出願は、現在展開されているメトリック(例えば、相関化メトリック)を導き出すための発明である適応手法について説明する。幾つかの実施形態においては、統計的勾配アルゴリズム又は最急降下(steepest decent)アルゴリズムは、最小のメトリック又は誤差レベルに収束する。これらの適応手法は、幾つかの欠点を有するおそれがある。1つの欠点は、収束が遅い可能性があることである。収束速度は、LMSアルゴリズムにおけるアルファ又は“ステップ利得”としばしば呼ばれる利得による影響を受ける。アルファ値が大きくなるほど、適応収束が高速になるが、最終的な収束解において“ジッター”が発生し、システムの安定性が失われる。この安定性が失われることは、第2の大きな欠点である。幾つかの場合においては、適応ループの利得が考慮されるしきい値を上回り、適応アルゴリズムがいずれの処理時点において希望されるレベルに収束できないことがある。さらに、アルファ又は“ステップ利得”に関して設定される安定性値は、適応アルゴリズムが展開されるシステムに依存し、経時で変化することがある。その結果、控えめな値がしばしば採用されてアルゴリズムの収束速度が遅くなる。
重みベクトルWc最小平均二乗誤差(MMSE)解は、Wc=R−1pとして計算することができ、ここで、乗算は、例えばN×NアレイにN×1ベクトルを乗じる行列演算を備えることができ、その結果、N×1Wcベクトルが得られ、ここでNの等化器重みが存在し、空間アレイの場合はNのビーム形成受信機が存在する。
図1は、ここにおいて説明される様々な側面による例示的中継器に関する典型的エンクロージャを示す。図1に示されるように、ダイポールデュアルパッチアンテナ構成は、中継器電子機器とともに、コンパクトなエンクロージャ100内に効率的に収納することができる。エンクロージャ100の構造は、2つの方法のうちの少なくとも1つで直感的に方位を定めることができるような構造であることができる。しかしながら、信号受信感度を最大にするためにエンクロージャの配置に関する取り扱い説明をユーザーに提供することができる。典型的ダイポールデュアルパッチアンテナ構成においては、中継器電子機器用プリント基板(PCB)とともに組み入れられたグランド面は、例えばスタンドオフ120を用いて2つのパッチアンテナ114と115と平行に及びこれらのパッチアンテナ114と115の間に配置することができる。多くの場合は、分離を向上させるための分離フェンス112を採用することができる。
デュプレクサ904、906、914、及び916と、トランシーバ908及び912と、デジタル中継器ベースバンド910と、を備える。デュプレクサ904、906、914、及び916は、基地局902及び加入者構成要素918から信号を受信/送信することができる1つ以上のアンテナ要素に動作可能な形で結合することができる。
Claims (10)
- デジタル中継器環境におけるフィードバックループキャンセルを容易にする方法であって、
受信機からの受信信号を格納することと、
前記受信信号を処理して送信されるべき信号を生成することと、
送信されるべき前記信号のサンプルを送信機及び先入れ先出し(FIFO)遅延ラインに並行して渡すことと、
FIFO入力位置から送信処理全体を通じての全遅延に等しい量からフィードバックキャンセルループの等化器サンプル遅延に等しい量を減じた量の選択された時間遅延を前記FIFO遅延ラインに渡された前記サンプルに加えてFIFO遅延送信基準信号を生成することと、
前記FIFO遅延送信基準信号のサンプルを選択された行列uとしてメモリに渡すことと、
前記FIFO遅延送信基準信号の前記格納されたサンプルから相関行列Rを生成することと、
前記遅延送信機基準信号を受信信号と相関化することから導き出された相互相関アレイpを生成し、その結果選択された次元を有するアレイpを得ることと、
R行列の逆行列及び前記アレイp用いて等化器タップ重みを計算すること、とを備え、
MMSEアルゴリズムと、MaxSNRアルゴリズムと、LCMZVアルゴリズムとを備える1つ以上の閉形式線形代数アルゴリズムに従って前記等化器タップ重みを計算することをさらに備える、方法。 - 前記FIFO遅延送信基準信号をメモリに格納することをさらに備える請求項1に記載の方法。
- Nのタップを有する等化器をさらに備え、Nは1以上である請求項2に記載の方法。
- 相関化メトリックを生成するために前記等化器と協力するための適応アンテナアレイを提供することをさらに備える請求項3に記載の方法。
- 前記FIFO遅延送信信号をu(1,l)乃至u(N,l)として格納することをさらに備え、u(k,l)は、Lの送信された時間サンプルのNの遅延されたバージョンの行列として表され、前記Nの遅延されたバージョンの各々は、等化器のタップ間における遅延と同じ量だけ遅延される請求項1に記載の方法。
- 前記u行列から相関行列Rを生成することをさらに備え、前記u行列は、次元N×Lを有し、エルミート転置に従って処理されてその結果N×N行列が得られる請求項5に記載の方法。
- 前記閉形式線形代数アルゴリズムを漏れ相関化メトリックと関係させて利用することをさらに備える請求項1に記載の方法。
- 前記閉形式線形代数アルゴリズムを適応アルゴリズムと関係させて利用することをさらに備える請求項1に記載の方法。
- コンピュータによって読み取り可能な媒体であって、
次の動作、すなわち、
送信されるべき前記信号のサンプルを送信機及び先入れ先出し(FIFO)遅延ラインに並行して渡すこと、
FIFO入力位置から送信処理全体を通じての全遅延に等しい量からフィードバックキャンセルループの等化器サンプル遅延に等しい量を減じた量の選択された時間遅延を前記FIFOサンプルに加えてFIFO遅延送信基準信号を生成すること、
前記FIFO遅延送信基準信号のサンプルを選択された行列uとしてメモリに渡すこと、
前記格納されたFIFO遅延送信基準信号サンプルから相関行列Rを生成すること、
前記格納されたFIFO遅延送信信号サンプルから部分的に導き出された相互相関ベクトルpを生成し、その結果選択された次元を有するアレイpを得ること、及び
R行列の逆行列及び前記アレイpを用いて等化器タップ重みを計算すること、であって、MMSEアルゴリズムと、MaxSNRアルゴリズムと、LCMZVアルゴリズムとを備える1つ以上の閉形式線形代数アルゴリズムに従って前記等化器タップ重みを計算することを行うためのコンピュータによって実行可能な命令を格納している、コンピュータによって読み取り可能な媒体。 - プロセッサであって、
送信されるべき前記信号のサンプルを送信機及び先入れ先出し(FIFO)遅延ラインに並行して渡すこと、
前記FIFO入力位置から送信処理全体を通じての前記全遅延に等しい量からフィードバックキャンセルループの等化器サンプル遅延に等しい量を減じた量の選択された時間遅延を前記FIFOサンプルに加えてFIFO遅延送信基準信号を生成すること、
前記FIFO遅延送信基準信号のサンプルを選択された行列uとして前記メモリに渡すこと、
前記格納されたFIFO遅延送信基準信号サンプルから相関行列Rを生成すること、
前記格納された送信信号から部分的に導き出された相互相関ベクトルpを生成し、その結果選択された次元を有するアレイpを得ること、及び
R行列の逆行列及び前記アレイpを用いて等化器タップ重みを計算することであって、
MMSEアルゴリズムと、MaxSNRアルゴリズムと、LCMZVアルゴリズムとを備える1つ以上の閉形式線形代数アルゴリズムに従って前記等化器タップ重みを計算することを前記プロセッサに行わせるコンピュータによって実行可能な命令を格納しているメモリを備える、プロセッサ。
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US90436807P | 2007-03-02 | 2007-03-02 | |
US60/904,368 | 2007-03-02 | ||
PCT/US2008/055732 WO2008109570A2 (en) | 2007-03-02 | 2008-03-03 | Closed form calculation of temporal equalizer weights used in a repeater transmitter leakage cancellation system |
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JP2010520718A JP2010520718A (ja) | 2010-06-10 |
JP5043961B2 true JP5043961B2 (ja) | 2012-10-10 |
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JP2009552825A Expired - Fee Related JP5043961B2 (ja) | 2007-03-02 | 2008-03-03 | 中継器送信機漏れキャンセルシステムにおいて用いられる時間等化器重みの閉形式計算 |
JP2009552826A Pending JP2010520719A (ja) | 2007-03-02 | 2008-03-03 | 適応アンテナアレイを利用する適応オンチャネル中継器におけるフィルタバンクの使用 |
JP2009552828A Expired - Fee Related JP5155339B2 (ja) | 2007-03-02 | 2008-03-03 | オンチャネル中継器において用いるための自動利得制御及びフィルタリング技法 |
JP2009552830A Expired - Fee Related JP5290207B2 (ja) | 2007-03-02 | 2008-03-03 | スーパーインポーズされた複合チャネルフィルタ |
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JP2009552829A Expired - Fee Related JP5118155B2 (ja) | 2007-03-02 | 2008-03-03 | 中継器構成 |
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JP2009552830A Expired - Fee Related JP5290207B2 (ja) | 2007-03-02 | 2008-03-03 | スーパーインポーズされた複合チャネルフィルタ |
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JP2009552827A Expired - Fee Related JP5134016B2 (ja) | 2007-03-02 | 2008-03-03 | 信号品質を向上させるためのオンライン中継器と連携した適応アンテナアレイの使用 |
JP2009552829A Expired - Fee Related JP5118155B2 (ja) | 2007-03-02 | 2008-03-03 | 中継器構成 |
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EP (7) | EP2127281A1 (ja) |
JP (7) | JP5043961B2 (ja) |
KR (10) | KR20090115981A (ja) |
CN (7) | CN101632241B (ja) |
BR (6) | BRPI0808486A2 (ja) |
CA (7) | CA2677912A1 (ja) |
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