JP5236661B2 - 多チャンネル広帯域通信システムにおけるベースバンドプリディストーション線形化の方法及びシステム - Google Patents
多チャンネル広帯域通信システムにおけるベースバンドプリディストーション線形化の方法及びシステム Download PDFInfo
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Description
本発明は一般に、多重変調方式を使用する広帯域通信システムに関する。詳しくは、本発明は、多チャンネル広帯域無線送信機の非線形性及びメモリ効果を補償するためのベースバンドプリディストーション線形化の方法及びシステムに関する。
関連出願
本願は、２００６年１２月２６日に出願され本願と発明者同一の米国仮特許出願第６０／８７７，０３５号の利益を主張する。また、２００７年１２月７日に出願された米国仮特許出願第６１／０１２，４１６号の利益を主張する。両出願は本明細書に文献援用される。米国仮特許出願第６１／０１２，４１６は付録１として本明細書に含まれる。
本願は、２００６年１２月２６日に出願され本願と発明者同一の米国仮特許出願第６０／８７７，０３５号の利益を主張する。また、２００７年１２月７日に出願された米国仮特許出願第６１／０１２，４１６号の利益を主張する。両出願は本明細書に文献援用される。米国仮特許出願第６１／０１２，４１６は付録１として本明細書に含まれる。
無線周波数（ＲＦ）電力増幅器（ＰＡ）の線形性及び効率は、無線通信システムにおいてスペクトル効率の重要性が増すにつれ、高いピーク対平均電力比（ＰＡＲ）を有する不定包絡線デジタル変調方式にとって重要な設計課題となっている。ＲＦＰＡは、ＰＡの出力に振幅変調−振幅変調（ＡＭ-ＡＭ）及び振幅変調−位相変調（ＡＭ-ＰＭ）歪みを発生させる非線形性を有する。かかる影響は、隣接チャンネル内のスペクトル再生、及び誤差ベクトル振幅（ＥＶＭ）を劣化させる帯域内歪みを生じさせる。
増幅器がその線形領域で動作する場合には電力効率が極めて低く、増幅器がその圧縮領域まで駆動されるにつれて電力効率は増加するので、線形性と効率とはトレードオフの関係にある。線形性及び効率を同時に高めるべく、典型的には線形化技術がＲＦＰＡに適用される。フィードバック、フィードフォワード、及びプリディストーションのような様々な線形化技術が提案されている。
１つの技術に、ベースバンドデジタルプリディストーション（ＰＤ）がある。これは、デジタル信号プロセッサを使用するのが典型的である。デジタルプリディストーションは、向上した線形性及び向上した電力効率を、広く使用される従来型フィードフォワード線形化技術と比べてシステムの複雑性を低減して実現することができる。ソフトウェアの実装により、マルチスタンダード環境に適した再構成可能性を有するデジタルプリディストータが与えられる。加えて、ドハティ電力増幅器（ＤＰＡ）のような効率向上技術を使用するＰＡは、従来のＰＡ設計よりも高い効率を実現することができるが線形性が犠牲となる。したがって、効率向上技術を使用するＰＡとデジタルプリディストーションとを組み合わせることには、システム線形性及び全体的効率を高める可能性がある。
しかし、ほとんどのデジタルＰＤは、メモリが全くないか又は微弱なＰＡを前提とする。このことは、メモリ効果によって出力信号が電流及び過去の入力信号に依存するという広帯域アプリケーションにおいては非現実的である。ＰＡのメモリ効果発生源には、アクティブ装置の自己発熱（長時定数若しくは熱的メモリ効果ともいう）、及びマッチングネットワーク若しくはバイアス回路に関連するアクティブ装置の周波数依存性（短時定数若しくは電気的メモリ効果ともいう）が含まれる。信号の帯域幅が増すにつれて、ＰＡのメモリ効果は顕著になり、メモリレスデジタルＰＤの性能が制限される。
デジタルＰＤのメモリ効果を克服するべく様々なアプローチが提案されている。短期メモリ効果に対しては、間接学習アルゴリズムを使用してメモリ効果を補償するべくボルテラフィルタ構造が適用されたが、次数増大に伴い最適化係数が極めて多数となる。かかる複雑性により、ボルテラフィルタに基づくＰＤは、現実のハードウェアに実装することが極めて困難となる。係数の数を低減するべくボルテラフィルタの簡略版であるメモリ多項式構造が提案されているが、この簡略版でさえなお多大な計算負荷が要求される。加えて、かかるメモリ多項式に基づくＰＤは、高次多項式の項が含まれると多項式係数を算出するのに行列反転が必要になるので数値的に不安定となる。従来の多項式に関連する数値的不安定性を緩和するべく、直交多項式に基づく、代替ではあるが同様に複雑な構造が利用されている。性能を犠牲にして複雑性をさらに低減するべく、メモリレス多項式ＰＤに従う有限インパルス応答（ＦＩＲ）フィルタ又は線形時不変（ＬＴＩ）システムであるハマースタインプリディストータが提案されている。ハマースタインプリディストータは、有限インパルス応答（ＦＩＲ）フィルタ又は線形時不変（ＬＴＩ）システムに従うメモリレス非線形性であるウィーナーモデル構造に従うＰＡモデルの使用を前提とする。
この実装は、ハマースタイン構造が、ＲＦ周波数応答に起因するメモリ効果のみを補償できるということを意味する。したがって、ＲＦ周波数応答が極めてフラットな場合、ハマースタインＰＤは、バイアス起因メモリ効果及び熱的メモリ効果のような他の任意のタイプのメモリ効果を修正することができない。
電気的メモリ効果を補償せずに、固定ルックアップテーブル（ＬＵＴ）ＰＤのための初期設定後のＰＡの温度変化に起因するゲイン及び位相の変動に対処するべく、ごく最近、サブ帯域フィルタブロックでカスケードされた固定ＬＵＴデジタルベースバンドＰＤが使用されている。
よって、多チャンネル広帯域無線送信機においてＲＦ周波数応答メモリ効果だけでなくバイアス起因又は熱的メモリ効果も補償できるベースバンドプリディストーション線形化法の必要性が長い間望まれている。
したがって、本発明は、従来技術の上述の制限の多くを実質的に克服し、多チャンネル広帯域無線送信機に見られる非線形性及びメモリ効果を補償するベースバンドプリディストーション線形化のシステム及び方法を与える。この目的は、ルックアップテーブルを利用する区分的にプリイコライズされたＰＤの使用によって達成される。このアプローチにより、本発明は、電気的及び熱的メモリ効果を補償することができると同時に、システムの計算複雑性及び数値不安定性を、メモリ多項式ＰＤアルゴリズムを使用する従来システムよりも低減することができる。他方、本発明は、多帯域ＰＡの性能として結果的に得られる線形性の点でメモリ多項式ＰＤに匹敵する。
本発明のさらなる目的及び利点は、添付図面とともに考慮される以下の詳細な説明により十分に理解することができる。
従来技術に見られるメモリ多項式ＰＤの計算複雑性及び数値不安定性を克服すべく、本発明は、ＬＵＴを備える適応ＬＵＴ型デジタルプリディストーションシステムを利用する。このＬＵＴは、メモリ効果を補償するべくプリイコライズされることにより、従来技術よりも少ない計算負荷を達成できる一方で、隣接チャンネル電力比（ＡＣＰＲ）を、メモリ多項式ＰＤが実現していたのと実質的に同程度まで低減する。このため、本発明によって与えられるシステムは以下では、区分的にプリイコライズされたルックアップテーブル型プリディストーション（piecewise pre-equalized, lookup table based predistortion（ＰＥＬＰＤ））システムと称する。
本発明に係るＰＥＬＰＤシステムの好適かつ代替的な実施例を、添付図面を参照して以下に詳細に説明する。
図１は、本発明に係る、ＰＥＬＰＤシステムの実施例を示す概略図である。図示される、ＬＵＴ１０６のインデクスに対して線形振幅をアドレス指定する方法は以下のように使用される。
ここで、ｕ（ｎ）は入力信号１０１であり、ｒｏｕｎｄ関数が、インデクス（ｍ）となる最も近い整数を返す。ＮはＬＵＴ１０６のサイズである。
デジタル複素ベースバンド入力信号サンプル１０１は、ＬＵＴエントリから導かれる複素係数１０２が以下のように乗算された後、プリイコライズ１０７される。
ここで、Ｆｍ（｜ｕ（ｎ）｜）は、ＰＡ１１０のＡＭ-ＡＭ及びＡＭ-ＰＭ歪みを補償するための、入力信号１０１の振幅に対応する複素係数１０２である。
区分プリイコライザ１０７のＬＵＴ内のＮ×Ｋ−１フィルタ係数が使用されてメモリ効果が補償される。ここで、ＮはＬＵＴの深さであり、ＫはＦＩＲフィルタのタップ数である。いくつかの実施例では区分プリイコライザ１０７は、安定性の問題から、無限インパルス応答（ＩＩＲ）フィルタではなくＦＩＲフィルタを使用する。ただし、ＦＩＲフィルタが全ての実施例に対して必ずしも必要というわけではない。プリイコライザの出力１０４は以下のように記述できる。
ここで、Ｗｋ ｍ（｜ｕ（ｎ）｜）は、入力信号ｕ（ｎ）１０１の振幅に対応するｋ番目のタップ及びｍ番目のインデクスの係数である。また、Ｗｋ ｍ（｜ｕ（ｎ）｜）は、｜ｕ（ｎ）｜の関数であり、Ｆｍ１０２は｜ｕ（ｎ−ｋ）｜の関数である。解析目的のため、メモリレスＬＵＴ１０６（Ｆｍ）構造は、以下のように多項式モデルで置換することができる。
ここで、２ｐ−１は多項式次数であり、ｂは、当該多項式次数に対応する複素係数である。さらに、タップ係数及びメモリレスＬＵＴ係数（Ｆｍ）１０２はそれぞれ、ｕ（ｎ）及びｕ（ｎ−ｋ）に依存する。
したがって、イコライザの各区分は、多項方程式を使用して以下のように表現できる。
ここで、Ｗｋ ｍ（｜ｕ（ｎ）｜）は、ｋ番目のタップ及びｍ番目のインデクスの、｜ｕ（ｎ）｜の関数である係数である。一般性を失わないで、区分プリイコライザ１０７はｌ次多項式を同様に使用して以下のように定義できる。
ここで、ｗｋ，ｌは、ｋ番目のタップ及びl次の係数である。
ｚ（ｎ）１０４のデジタル-アナログ変換１０８の後、本信号は、ＲＦにアップコンバート１０９され、ＰＡ１１０生成歪みによって増幅され、減衰１１３され、ベースバンドにダウンコンバート１１４され、最終的にはアナログ−デジタル変換１１５されて遅延１１６推定アルゴリズム１１７に適用される。フィードバック信号すなわち遅延ｙ（ｎ−Δ）１０５を伴うＰＡ１１０の出力は、以下のように記述できる。
ここで、Ｇ（・）及びΦ（・）はそれぞれ、ＰＡ１１０のＡＭ-ＡＭ歪み及びＡＭ-ＰＭ歪みであり、Δはフィードバックループ遅延である。Δを推定するべく、相関法が以下のように適用された。
ここで、ｄは遅延変数であり、Ｎは相関されるブロックサイズである。
遅延１１６の推定後、間接学習を備えた最小平均自乗（ＬＭＳ）アルゴリズムである以下の方程式によってメモリレスＬＵＴ１０６係数を推定することができる。
ここで、ｎは反復回数、μは安定性係数、ｅ（ｎ）はｘ（ｎ）−ｙ（ｎ）・Ｆｍ（｜ｘ（ｎ）｜）である。
なお、すでに生成されたアドレス指定を、不正確なインデクス付けに起因して他の誤差を生じさせ得る歪み信号であるｙ（ｎ）１０５をインデクス付けするべく再使用してよい。この手順の間、サンプルｘ（ｎ）１０３は、区分プリイコライザ１０７をバイパスする必要がある。この間接学習ＬＭＳアルゴリズムの収束の後、イコライザ１０７がアクティベーションされる。ＬＭＳアルゴリズムを備える間接学習法はまた、区分的なフィルタ係数の適応にも利用された。フィードバックパス内の多重イコライザ１０７の入力はベクトル形式で以下のように記述される。
ここで、ｙＦ（ｎ）は、ポストＬＵＴ出力、すなわちｙ（ｎ）・Ｆｍ（｜ｙ（ｎ）｜）である。
したがって、複数のＦＩＲフィルタ出力ｙＦＯ（ｎ）は、以下の方程式によりベクトル形式で導出できる。
ここで、Ｔは転置演算子である。
プリイコライザ１０７のタップ係数の適応は以下のようにして得ることができる。
ここで、Ｅ（ｎ）は、ｚ（ｎ）とｙＦＯ（ｎ）との誤差信号であり、μはステップサイズである（＊は複素共役を示す）。適応アルゴリズムが、フィードバック信号と入力信号を遅延させた信号との比較によって係数の値を決定する。
出力１１１から始まるフィードバックパスを参照すると、かかるフィードバックを使用してＬＵＴ値又は多項式係数を更新するためのいくつかの代替例が存在することがわかる。いくつかの実施例では、ＰＡの出力はベースバンドへ変換されて、その結果得られたベースバンド信号が入力信号と比較される。その結果生じる誤差は、ＬＵＴ値及び係数を修正するべく使用される。他の実施例では、ＰＡの出力はスペクトルがモニタされ、ダウンコンバータ、バンドパスフィルタ、及び電力検出器を使用して帯域外の歪みがモニタされる。電力検出器の値はその後、ＬＵＴ値又は多項式係数を調整するべく使用される。
図２は、多項方程式が利用される場合の、対応する区分プリイコライザ１０７のブロック図を示す。多項式表現は、ボルテラ級数と同様のあまりにも多くの複素乗算を必要とする。図１に示されるＰＥＬＰＤに基づくアプローチを利用することで、その複雑性は低減される。これは、より多くのメモリが必要になるとはいえ、必要な計算が少なくなるからである。本明細書の説明からわかるように、プリイコライザ部分が、メモリ効果を修正するべく適用及び設計可能である一方で、ＬＵＴは主として、市販のＰＡに見られる他の非線形性を修正するべくプリディストーションを行う役割を果たす。
図３Ａ−図３Ｄは、本発明のＰＥＬＰＤの図表による説明である。典型的なメモリレスプリディストータの応答を図３Ａに示す。図３Ｂは、Ｎ区分に分割された区分プリイコライザにより生成されるヒステリシスを示す。電力増幅器のヒステリシスが必ずしも入力振幅レンジ全体にわたって均一に分散するとは限らないので、区分プリイコライザが適用されることにより入力レンジ全体にわたる均一な補償が実現できる。本発明のＰＥＬＰＤ（区分的にプリイコライズされたルックアップテーブル型プリディストーション）の出力が図３Ｃに示される。これは、図３Ａ及び図３Ｂのカスケードの結果得られたものと考えることができる。図３Ｄは典型的な電力増幅器の応答を示し、図３Ｂは結果的に、図３Ｃに表されるような本発明のＰＥＬＰＤとなる。図３Ｄは、メモリを有する典型的な電力増幅器の応答を示す。図３Ｅの所望の線形的な応答は、図３Ｃ及び図３Ｄがカスケードされた後に実現される。
本発明のＰＥＬＰＤの性能を試験するべく、まずは時間領域測定サンプルに基づくＰＡのビヘイビアモデリングが行われた。ビヘイビアモデルは、丸め付きボルテラモデルに基づく。最終段で２つの１７０Ｗプッシュプル型横方向拡散金属酸化物半導体（ＬＤＭＯＳ）を使用する尖頭包絡線電力（peak envelope power（ＰＥＰ））３００ＷのドハティＰＡが設計された。このドハティＰＡは２１４０ＭＨｚの帯域で動作し、平均３０Ｗ出力電力において６１ｄＢのゲイン及び２８％の電力付加効率（ＰＡＥ）を有する。実際のＰＡの測定に基づくＰＡモデルを構築するべく、テストベンチを利用した［K. Mekechuk, W. Kim, S. Stapleton, and J. Kim, “Linearinzing Power Amplifiers Using Digital Predistortion, EDA Tools and Test Hardware,” High Frequency Electronics, pp. 18-27, April 2004］。ビヘイビアモデルに基づき、メモリレスＬＵＴのＰＤ、ハマースタインＰＤ、本発明のＰＥＬＰＤ、及びメモリ多項式ＰＤを含む様々なタイプのＰＤがシミュレーションされ、隣接チャンネル電力比（ＡＣＰＲ）の性能が比較された。ＬＵＴサイズは、全てのシミュレーションにわたり１２８エントリに固定された。これは、量子化効果及びメモリサイズを考慮した妥協サイズである。当業者であれば、非線形性の補償量がＬＵＴ１０６のサイズに依存することが理解できるだろう。ＬＵＴサイズが増加するほど、非線形性の正確な表示がもたらされるようになる一方で、適応に労力を要するようになる。したがって、ＬＵＴサイズの選択は、正確性と複雑性とのトレードオフとなる。
試験信号としては、第３世代パートナーシッププロジェクト（３ＧＰＰ）標準仕様に基づくテストモードの６４の専用物理チャンネル（ＤＰＣＨ）を有する単一ダウンリンクＷ-ＣＤＭＡ搬送波が使用された。これは、３．８４Ｍｃｈｉｐｓ／ｓ及び波高因子９．８ｄＢを有する。まず、Ｗ-ＣＤＭＡ信号に匹敵する９．０３ｄＢのＰＡＲ及び４ＭＨｚの帯域幅を有する５００ｋＨｚ間隔の８トーン信号が、提案方法を検証するべく使用された。
図４Ａ−図４Ｄは、４タイプのＰＤの線形化前後の代表的な線形化結果を示す図表である。図４Ａに示されるように、従来のメモリレスＬＵＴのＰＤは、線形性を高めることができると同時にメモリ効果を補償することができる。図４Ｂは、ハマースタインＰＤを示す。これは、１０ＭＨｚを超えると性能が劣化するが、１０ＭＨｚ帯域幅内では向上する。メイン信号パスでのＲＦ周波数応答が極めてフラットな場合、ハマースタインＰＤは、周波数応答メモリ効果以外のメモリ効果を修正することができない。また、従来のハマースタインＰＤの使用によりスペクトル再生を低減することには明白な向上が見られない。ハマースタインＰＤがメモリ効果から生じる歪みを抑制できる能力が極めて限られたものであることは非常に明白である。図４Ｃは、本発明のＰＥＬＰＤ（２タップを有する）の性能を示す。図４Ｄは、従来のメモリ多項式ＰＤ（５次であって２つのメモリ項を有する）の性能を示す。図４Ａ−図４Ｄを比較すると、本発明のＰＥＬＰＤがＡＣＰＲ性能の点で、メモリ多項式ＰＤに匹敵することがわかる。
図５は、上記４タイプのＰＤの線形化結果を示す図表である。単一Ｗ-ＣＤＭＡ搬送波が、ＬＵＴのＰＤ、ＬＵＴハマースタインＰＤ、本発明のＰＥＬＰＤ、及びメモリ多項式ＰＤに適用された。
図６は、当該４タイプのＡＣＰＲのシミュレーション結果の性能比較をそれぞれ示す図表である。従来のハマースタインＰＤは、メモリ効果による歪みを、メモリレスＰＤよりも改善することができなかった。本発明のＰＥＬＰＤは、ＰＡの非線形性及びメモリ効果による歪みを抑制することができたと考えられる。
ビヘイビアＰＡモデルに基づくシミュレーションにおいて本発明のＰＥＬＰＤのＡＣＰＲ性能を検証した後、テストベンチにて実際のドハティＰＡを使用して実験が行われた。送信機プロトタイプは、ＰＡの他に２つのデジタル−アナログコンバータ（ＤＡＣ）及び１つのＲＦアップコンバータを有するＥＳＧからなる。受信機は、ＲＦダウンコンバータ、高速アナログ−デジタルコンバータ、及びデジタルダウンコンバータを含む。この受信機プロトタイプは、ＶＳＡから構築してよい。ホストＤＳＰとしては、ＰＣが遅延補償及びプリディストーションアルゴリズムを目的として使用された。試験信号としては、３．８４Ｍｃｈｉｐｓ／ｓ及び波高因子９．８ｄＢを備える６４ＤＰＣＨのテストモデル１による２つのダウンリンクＷ-ＣＤＭＡ搬送波が、異なるＰＤの補償性能を検証するための測定における入力信号として使用された。ＰＤの係数全ては、ＰＡの逆モデリングとみなされる間接学習アルゴリズムによって特定される。検証プロセス中、ハマースタインＰＤ、本発明のＰＥＬＰＤ（２タップを有する）、及び５次-２遅延メモリ多項式に対して、２５６エントリのＬＵＴ、５タップのＦＩＲフィルタが使用された。タップ数の選択は、いくつかの測定から最適化された。
図７は、単一Ｗ-ＣＤＭＡ搬送波を使用した４タイプのＰＤの線形化前後に実測された線形化結果をそれぞれ示す図表である。プロトタイプの送信機の出力におけるＡＣＰＲ計算は、中心周波数からの周波数オフセット（±５ＭＨｚ）にて行われた。
図８は、単一Ｗ-ＣＤＭＡ搬送波を使用した４タイプのＰＤに対するＡＣＰＲの測定結果の性能比較を示す図表である。５タップＦＩＲフィルタを有するハマースタインＰＤを備える送信機のＡＣＰＲ値は約１ｄＢである。これは、上位ＡＣＲＰ（５ＭＨｚオフセット）においてＬＵＴのＰＤよりも良好であり、下位ＡＣＰＲ（−５ＭＨｚオフセット）において同等である。本発明のＰＥＬＰＤ及び５次-２メモリ多項式ＰＤは、ＡＣＰＲの点で近似した補償性能を示す。双方は、ハマースタインＰＤ及びメモリレスＬＵＴのＰＤと比べてＡＣＰＲを、上位及び下位ＡＣＰＲそれぞれに対して約４ｄＢ及び６ｄＢ改善することができる。
本発明のＰＥＬＰＤ法とメモリ多項式法とで複雑性が評価された。（ＬＵＴ読み取り、書き込み、インデクス付け、信号振幅の平方根（ＳＱＲＴ）計算は無視されている。これはＬＵＴインデクス付けは当該方法だけでなく、例えば振幅、対数、べき乗等の変数にも依存するからであり、ＳＱＲＴ演算は様々な方法で実装可能だからである。）したがって、複雑性は、入力サンプルごとの加算（減算）及び乗算の数をカウントすることのみによって見積もられた。実際のハードウェア実装を考慮するべく、複素数演算は実数演算に変換され、メモリサイズも考慮されている。例えば、１つの複素数乗算には、２つの実数加算及び４つの実数乗算が必要となる。ＮがＬＵＴエントリ数であれば、必要なメモリサイズは２Ｎ（Ｉ及びＱのＬＵＴ）となる。
図９は、本発明のＰＥＬＰＤの複雑性評価を示す図表である。ＬＵＴが２５６エントリを有しかつフィルタが２タップを有する場合、ＰＤは、サンプルごとの４０の実数加算（減算）、５４の実数乗算、及び１５４２のメモリサイズを必要とする。本発明のＰＥＬＰＤは、従来のハマースタインＰＤと比べて同数の加算及び乗算を必要とする一方で多くのメモリを必要とする。
図１０は、ＲＬＳ間接学習アルゴリズムを使用したメモリ多項式ＰＤの複雑性評価を示す図表である。算術演算数は図１１に与えられており、ＯはＰ（Ｋ＋１）に等しい。例えば、Ｐ＝５かつＫ＝１であれば、サンプルごとの１３４２の実数加算（減算）、１６４４の実数乗算、及び２４のメモリサイズが必要になる。本発明のＰＥＬＰＤと比較すると、メモリ多項式ＰＤは、サンプルごとの実数乗算の３００倍が必要になる。したがって、複雑性は当該ＰＥＬＰＤ法によって著しく低減される。加えて、メモリ多項式法の実数乗算数は、多項式の次数の平方べき数及びメモリ長に応じて増加する。
まとめると、本発明のＰＥＬＰＤは、従来のハマースタインアプローチよりも効率的にスペクトル再生を低減し、メモリ多項式ＰＤと同等の修正能力を実現し得るにもかかわらず、複雑性がはるかに少なくて済む。
本発明が好ましい実施例及び代替実施例を参照して説明されてきたが、本発明は上述の詳細に限定されない。様々な代替例及び修正例が上述され、他の例も当業者には想到可能である。したがって、代替例及び修正例の全ては、添付の特許請求の範囲に定義される発名の範囲内に包含される。
Claims (11)
- 多重変調方式を使用する多チャンネル広帯域通信システムの隣接チャンネル電力比を低減かつメモリ効果を補償する方法であって、
通信システムのベースバンド入力信号のサンプルからアドレスを生成するステップと、
前記アドレスに応じてメモリレスルックアップテーブルから第１エントリを取得するステップと、
前記ベースバンド入力信号と前記メモリレスルックアップテーブルの前記第１エントリとを乗算して積を得るステップと、
前記積をプリイコライザに通すステップと
を含み、
前記メモリレスルックアップテーブルの係数が前記ベースバンド入力信号の現在値及び過去値に依存し、
前記プリイコライザは、前記アドレスに応じてメモリルックアップテーブルから第２エントリを取得し、前記第２エントリに基づいて前記積を修正する方法。 - 前記メモリレスルックアップテーブルの複数のエントリは複素係数である、請求項１に記載の方法。
- 前記積をプリイコライザに通すステップは、区分的なイコライズに影響を与えることを含む、請求項１に記載の方法。
- 前記積をプリイコライザに通すステップは、有限インパルス応答フィルタリングを使用することを含む、請求項１に記載の方法。
- 前記区分的なプリイコライザは、無限インパルス応答フィルタではなく有限インパルス応答フィルタを使用する、請求項３に記載の方法。
- 間接学習法を使用して前記メモリレスルックアップテーブルの複数のエントリを更新することをさらに含む、請求項１に記載の方法。
- 前記間接学習法は最小平均自乗アルゴリズムを使用する、請求項６に記載の方法。
- 前記メモリレスルックアップテーブルから第１エントリを取得するステップは、以下の方程式を決定することによって行われ、
- 前記ベースバンド入力信号と前記第１エントリとを乗算することは、
ここで、Ｆｍ（｜ｕ（ｎ）｜）は、前記メモリレスルックアップテーブルの複素係数である、請求項１に記載の方法。 - 以下の方程式を使用して第２のプリイコライズを行うステップをさらに含み、
Ｗｋ ｍ（｜ｕ（ｎ）｜）は、入力信号ｕ（ｎ）の振幅に対応するｋ番目のタップ及びｍ番目のインデクスの係数である、請求項１に記載の方法。 - 多重変調方式を使用する多チャンネル広帯域通信システムの隣接チャンネル電力比を低減かつメモリ効果を補償するシステムであって、
通信システムのベースバンド入力信号のサンプルからアドレスを生成するアドレス生成器と、
前記アドレスに応じてアドレス指定可能な第１係数を有するメモリレスルックアップテーブルと、
前記ベースバンド入力信号と前記第１係数とを組み合わせて積を得る乗算器と、
前記第１係数に対応する第１ルックアップテーブルエントリと、
前記乗算器についてプリイコライズを行って前記通信システムの電力増幅器におけるメモリ効果を補償するイコライザと
を含み、
前記第１係数は、前記ベースバンド入力信号の現在値及び過去値に依存し、
前記イコライザは、前記アドレスに応じてメモリルックアップテーブルから第２ルックアップテーブルエントリを取得し、前記第２ルックアップテーブルエントリに基づいて前記積を修正するシステム。
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| US1241607P | 2007-12-07 | 2007-12-07 | |
| US61/012,416 | 2007-12-07 | ||
| PCT/IB2007/004404 WO2008078195A2 (en) | 2006-12-26 | 2007-12-20 | Method and system for baseband predistortion linearization in multi-channel wideband communication systems |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8855234B2 (en) | 2006-12-26 | 2014-10-07 | Dali Systems Co. Ltd. | Method and system for baseband predistortion linearization in multi-channel wideband communications systems |
Families Citing this family (216)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8380143B2 (en) | 2002-05-01 | 2013-02-19 | Dali Systems Co. Ltd | Power amplifier time-delay invariant predistortion methods and apparatus |
| US8811917B2 (en) * | 2002-05-01 | 2014-08-19 | Dali Systems Co. Ltd. | Digital hybrid mode power amplifier system |
| US8886341B1 (en) | 2006-04-04 | 2014-11-11 | Microsoft Corporation | Adaptive sample-by-sample controller for under-determined systems |
| US7796960B1 (en) | 2006-04-04 | 2010-09-14 | Nortel Networks Limited | Signal transmitter linearization |
| CN101416382B (zh) * | 2006-04-10 | 2011-05-25 | 艾利森电话股份有限公司 | 用于减少rf功率放大器中的频率记忆效应的方法和设备 |
| US9026067B2 (en) * | 2007-04-23 | 2015-05-05 | Dali Systems Co. Ltd. | Remotely reconfigurable power amplifier system and method |
| WO2009053910A2 (en) | 2007-10-22 | 2009-04-30 | Mobileaccess Networks Ltd. | Communication system using low bandwidth wires |
| JP2009111958A (ja) * | 2007-11-01 | 2009-05-21 | Hitachi Kokusai Electric Inc | プリディストータ |
| EP2248255A4 (en) | 2007-12-07 | 2014-05-28 | Dali Systems Co Ltd | DIGITAL PREDISTORSION RF DERIVED BASEBAND |
| JP4996502B2 (ja) * | 2008-02-20 | 2012-08-08 | 日本無線株式会社 | 歪補償回路及びプリディストーション型歪補償増幅器 |
| US8064851B2 (en) * | 2008-03-06 | 2011-11-22 | Crestcom, Inc. | RF transmitter with bias-signal-induced distortion compensation and method therefor |
| JP5115979B2 (ja) * | 2008-07-24 | 2013-01-09 | 日本無線株式会社 | プリディストータ |
| JP5205182B2 (ja) * | 2008-09-09 | 2013-06-05 | 株式会社日立国際電気 | 歪補償増幅装置 |
| TWI390839B (zh) * | 2008-11-17 | 2013-03-21 | Realtek Semiconductor Corp | 功率放大器的失真校正裝置與方法 |
| JP5238461B2 (ja) * | 2008-11-19 | 2013-07-17 | 日本無線株式会社 | プリディストータ |
| WO2010090999A1 (en) | 2009-02-03 | 2010-08-12 | Corning Cable Systems Llc | Optical fiber-based distributed antenna systems, components, and related methods for monitoring and configuring thereof |
| EP2430531B1 (en) * | 2009-04-24 | 2019-12-04 | Dali Systems Co. Ltd. | Remotely reconfigurable power amplifier system and method |
| US8837629B2 (en) * | 2011-05-11 | 2014-09-16 | Fadhel M Ghannouchi | Extended bandwidth digital Doherty transmitter |
| CA2704522C (en) | 2009-05-14 | 2017-02-14 | Seyed Aidin Bassam | Multi-cell processing architectures for modeling and impairment compensation in multi-input multi-output systems |
| KR101348275B1 (ko) * | 2009-09-17 | 2014-01-08 | 한국전자통신연구원 | 전력 증폭기의 전치 왜곡 장치와 방법 |
| CN102025327B (zh) * | 2009-09-18 | 2013-01-02 | 富士通株式会社 | 放大器装置和预失真控制方法 |
| JP5339083B2 (ja) * | 2009-10-06 | 2013-11-13 | 日本電気株式会社 | ディジタル歪補償方法及び回路 |
| US8280259B2 (en) | 2009-11-13 | 2012-10-02 | Corning Cable Systems Llc | Radio-over-fiber (RoF) system for protocol-independent wired and/or wireless communication |
| US8542768B2 (en) | 2009-12-21 | 2013-09-24 | Dali Systems Co. Ltd. | High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications |
| KR101815329B1 (ko) | 2009-12-21 | 2018-01-05 | 달리 시스템즈 씨오. 엘티디. | 변조 방식에 무관한 디지털 하이브리드 모드 전력 증폭기 시스템 및 그 방법 |
| FR2954624B1 (fr) | 2009-12-23 | 2012-09-07 | Thales Sa | Dispositif de linearisation pour amplificateur de puissance. |
| CN102130697B (zh) | 2010-01-20 | 2015-05-27 | 华为技术有限公司 | 接收机、发射机及反馈装置、收发信机和信号处理方法 |
| US8275265B2 (en) | 2010-02-15 | 2012-09-25 | Corning Cable Systems Llc | Dynamic cell bonding (DCB) for radio-over-fiber (RoF)-based networks and communication systems and related methods |
| US8792581B2 (en) * | 2010-02-18 | 2014-07-29 | Telefonaktiebolaget Lm Ericsson (Publ) | RF clock generator with spurious tone cancellation |
| EP2815502B1 (en) | 2010-04-21 | 2018-03-14 | ZTE Corporation | Improved capture buffer of digital predistortion systems |
| US9525488B2 (en) | 2010-05-02 | 2016-12-20 | Corning Optical Communications LLC | Digital data services and/or power distribution in optical fiber-based distributed communications systems providing digital data and radio frequency (RF) communications services, and related components and methods |
| EP2606707A1 (en) | 2010-08-16 | 2013-06-26 | Corning Cable Systems LLC | Remote antenna clusters and related systems, components, and methods supporting digital data signal propagation between remote antenna units |
| US8848766B2 (en) | 2010-08-17 | 2014-09-30 | Dali Systems Co. Ltd. | Neutral host architecture for a distributed antenna system |
| CN103597807B (zh) | 2010-09-14 | 2015-09-30 | 大理系统有限公司 | 远程可重新配置的分布式天线系统和方法 |
| JP2012065154A (ja) * | 2010-09-16 | 2012-03-29 | Toshiba Corp | 歪み補償の装置および方法 |
| US9252874B2 (en) | 2010-10-13 | 2016-02-02 | Ccs Technology, Inc | Power management for remote antenna units in distributed antenna systems |
| DE102010064396A1 (de) * | 2010-12-30 | 2012-07-05 | Intel Mobile Communications GmbH | HF-Rückkopplungsempfängeranordnung, HF-Sendeanordnung und HF-Sende-Empfangsanordnung |
| JP5707999B2 (ja) * | 2011-02-09 | 2015-04-30 | 富士通株式会社 | 歪補償装置、送信機及び歪補償方法 |
| EP2678972B1 (en) | 2011-02-21 | 2018-09-05 | Corning Optical Communications LLC | Providing digital data services as electrical signals and radio-frequency (rf) communications over optical fiber in distributed communications systems, and related components and methods |
| CN102651725B (zh) * | 2011-02-25 | 2015-01-28 | 中兴通讯股份有限公司 | 一种多用户频偏补偿方法及装置 |
| US9680567B2 (en) * | 2011-03-03 | 2017-06-13 | Acacia Communications, Inc. | Fault localization and fiber security in optical transponders |
| TWI556597B (zh) | 2011-03-31 | 2016-11-01 | Panasonic Corp | Wireless communication device |
| WO2012148940A1 (en) | 2011-04-29 | 2012-11-01 | Corning Cable Systems Llc | Systems, methods, and devices for increasing radio frequency (rf) power in distributed antenna systems |
| KR102067099B1 (ko) * | 2011-06-09 | 2020-02-11 | 콤스코프 테크놀로지스, 엘엘씨 | 표준화 포맷의 디지털 신호를 처리하기 위한 분산 안테나 시스템 인터페이스 |
| WO2013009835A1 (en) | 2011-07-11 | 2013-01-17 | Andrew Llc | Method and apparatuses for managing a distributed antenna system |
| CN102354118B (zh) * | 2011-08-10 | 2013-10-16 | 复旦大学 | 一种适于硬件实现的数字预失真算法系统 |
| EP2752044B1 (en) * | 2011-08-29 | 2016-07-20 | CommScope Technologies LLC | Configuring a distributed antenna system |
| CN103999436B (zh) | 2011-09-02 | 2016-08-24 | 大力系统有限公司 | 用于降低上行链路噪声的软件可配置的分布式天线系统及方法 |
| KR102011161B1 (ko) | 2011-09-22 | 2019-08-14 | 달리 시스템즈 씨오. 엘티디. | 멀티채널 광대역 통신 시스템에서 디지털 사전왜곡을 위해 대역폭을 증가시키는 시스템 및 방법 |
| US8817859B2 (en) * | 2011-10-14 | 2014-08-26 | Fadhel Ghannouchi | Digital multi-band predistortion linearizer with nonlinear subsampling algorithm in the feedback loop |
| US8884796B2 (en) * | 2011-10-20 | 2014-11-11 | Kathrein-Werke Kg | Delta-sigma modulator with feedback signal modification |
| US9420628B2 (en) * | 2011-11-07 | 2016-08-16 | Dali Systems Co. Ltd. | Virtualized wireless network with pilot beacons |
| EP3709693A1 (en) | 2011-11-07 | 2020-09-16 | Dali Systems Co. Ltd | Soft hand-off and routing data in a virtualized distributed antenna system |
| WO2013070613A1 (en) | 2011-11-07 | 2013-05-16 | Dali Systems Co. Ltd. | Virtualized wireless network |
| US9083292B2 (en) | 2011-12-26 | 2015-07-14 | Mitsubishi Electric Corporation | Analog feedback amplifier |
| BR112014020305A8 (pt) * | 2012-02-17 | 2021-06-29 | Dali Systems Co Ltd | métodos para equilibrar o tráfego de rede não uniformemente distribuído em um sistema de comunicações sem fio, e para equilibrar o tráfego de srede não uniformemente distribuído em um sistema de antenas distribuído (das), e, sistema de antenas distribuído (das) |
| US8798559B2 (en) * | 2012-02-28 | 2014-08-05 | Telefonaktiebolaget L M Ericsson (Publ) | FIR/IIR filter predistorter for power amplifiers exhibiting short-term and/or long-term memory effects |
| EP2829152A2 (en) | 2012-03-23 | 2015-01-28 | Corning Optical Communications Wireless Ltd. | Radio-frequency integrated circuit (rfic) chip(s) for providing distributed antenna system functionalities, and related components, systems, and methods |
| EP2832012A1 (en) | 2012-03-30 | 2015-02-04 | Corning Optical Communications LLC | Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (mimo) configuration, and related components, systems, and methods |
| TWI481219B (zh) * | 2012-04-13 | 2015-04-11 | Accton Technology Corp | 無線中繼站之施體天線裝置、服務天線裝置及其訊號傳輸方法 |
| EP2667507B1 (en) * | 2012-05-21 | 2014-10-29 | Alcatel Lucent | Amplifier |
| US9363768B2 (en) * | 2012-07-09 | 2016-06-07 | Dali Systems Co. Ltd. | Self-optimizing distributed antenna system using soft frequency reuse |
| US9107086B2 (en) | 2012-07-20 | 2015-08-11 | Adc Telecommunications, Inc. | Integration panel |
| US10506454B2 (en) * | 2012-07-31 | 2019-12-10 | Dali Systems Co., Ltd. | Optimization of traffic load in a distributed antenna system |
| EP2789107B1 (en) | 2012-08-09 | 2017-02-15 | Axell Wireless Ltd. | A digital capacity centric distributed antenna system |
| US9439242B2 (en) | 2012-08-13 | 2016-09-06 | Dali Systems Co., Ltd. | Time synchronized routing in a distributed antenna system |
| JP5853913B2 (ja) * | 2012-09-12 | 2016-02-09 | 富士通株式会社 | アドレス制御装置、送信装置およびアドレス制御方法 |
| US8913689B2 (en) | 2012-09-24 | 2014-12-16 | Dali Systems Co. Ltd. | Wide bandwidth digital predistortion system with reduced sampling rate |
| US9112549B2 (en) * | 2012-10-05 | 2015-08-18 | Dali Systems Co. Ltd. | DAS integrated digital off-air repeater |
| WO2014053149A1 (en) | 2012-10-05 | 2014-04-10 | Andrew Wireless Systems Gmbh | Capacity optimization sub-system for distributed antenna system |
| US9455784B2 (en) | 2012-10-31 | 2016-09-27 | Corning Optical Communications Wireless Ltd | Deployable wireless infrastructures and methods of deploying wireless infrastructures |
| US8908607B2 (en) | 2012-10-31 | 2014-12-09 | Andrew Llc | Digital baseband transport in telecommunications distribution systems |
| KR102143564B1 (ko) | 2012-11-26 | 2020-08-11 | 콤스코프 테크놀로지스 엘엘씨 | 디지털 라디오 주파수 전송에 있어 순방향-경로 디지털 합산 |
| WO2014082070A1 (en) | 2012-11-26 | 2014-05-30 | Adc Telecommunications, Inc. | Flexible, reconfigurable multipoint-to-multipoint digital radio frequency transport architecture |
| US20140146797A1 (en) | 2012-11-26 | 2014-05-29 | Adc Telecommunications, Inc. | Timeslot mapping and/or aggregation element for digital radio frequency transport architecture |
| JP6002557B2 (ja) * | 2012-11-28 | 2016-10-05 | 株式会社日立製作所 | 光多値信号予等化回路、光多値信号予等化送信器及び偏波多重光予等化送信器 |
| CN105308876B (zh) | 2012-11-29 | 2018-06-22 | 康宁光电通信有限责任公司 | 分布式天线系统中的远程单元天线结合 |
| ITMO20120317A1 (it) * | 2012-12-21 | 2014-06-22 | Teko Telecom S P A | Sistema e metodo per la predistorsione digitale in amplificatori di potenza, particolarmente per comunicazioni a radiofrequenza |
| JP6054739B2 (ja) * | 2012-12-26 | 2016-12-27 | パナソニック株式会社 | 歪み補償装置及び歪み補償方法 |
| CN103051574B (zh) * | 2013-01-16 | 2016-05-11 | 大唐移动通信设备有限公司 | 数字预失真处理方法及系统 |
| US20140320340A1 (en) * | 2013-02-21 | 2014-10-30 | Dali Systems Co. Ltd. | Indoor localization using analog off-air access units |
| KR102058437B1 (ko) | 2013-02-25 | 2019-12-26 | 삼성전자주식회사 | 필터 값 추출기를 포함하는 터치 감지 장치 및 필터 값 추출기 |
| US9955361B2 (en) | 2013-02-26 | 2018-04-24 | Dali Systems Co., Ltd. | Method and system for WI-FI data transmission |
| US8989307B2 (en) * | 2013-03-05 | 2015-03-24 | Qualcomm Incorporated | Power amplifier system including a composite digital predistorter |
| US9680423B2 (en) * | 2013-03-13 | 2017-06-13 | Analog Devices Global | Under-sampling digital pre-distortion architecture |
| US9851445B2 (en) * | 2013-04-23 | 2017-12-26 | Dali Systems Co. Ltd. | Real-time locating system using GPS time difference of arrival with digital off-air access units and remote units |
| US20140333376A1 (en) * | 2013-05-09 | 2014-11-13 | King Fahd University Of Petroleum And Minerals | Scalable digital predistortion system |
| US9172334B2 (en) * | 2013-05-09 | 2015-10-27 | King Fahd University Of Petroleum And Minerals | Digital predistortion system and method with extended correction bandwidth |
| EP2997656A1 (en) * | 2013-05-16 | 2016-03-23 | Telefonaktiebolaget LM Ericsson (publ) | Baseband equivalent volterra series for behavioral modeling and digital predistortion of wideband transmitters |
| EP3000175B1 (en) | 2013-05-20 | 2019-02-27 | Analog Devices, Inc. | Relaxed digitization system linearization |
| US9252718B2 (en) | 2013-05-22 | 2016-02-02 | Telefonaktiebolaget L M Ericsson (Publ) | Low complexity digital predistortion for concurrent multi-band transmitters |
| US9385762B2 (en) | 2013-05-22 | 2016-07-05 | Telefonaktiebolaget L M Ericsson (Publ) | Linearization of intermodulation bands for concurrent dual-band power amplifiers |
| CN103401511A (zh) * | 2013-07-05 | 2013-11-20 | 华南理工大学 | 一种用于实时性系统的功放预失真方法 |
| CN105359572B (zh) | 2013-07-11 | 2019-06-18 | 安德鲁无线系统有限公司 | 为多个网络运营商服务的小小区网络架构 |
| US9787457B2 (en) | 2013-10-07 | 2017-10-10 | Commscope Technologies Llc | Systems and methods for integrating asynchronous signals in distributed antenna system with direct digital interface to base station |
| US9750082B2 (en) | 2013-10-07 | 2017-08-29 | Commscope Technologies Llc | Systems and methods for noise floor optimization in distributed antenna system with direct digital interface to base station |
| JP6255917B2 (ja) * | 2013-11-07 | 2018-01-10 | 富士通株式会社 | 無線装置及び無線アクセスシステム |
| KR102189745B1 (ko) * | 2013-12-06 | 2020-12-14 | 주식회사 쏠리드 | 광 중계 시스템의 리모트 장치 |
| US9847816B2 (en) * | 2013-12-19 | 2017-12-19 | Dali Systems Co. Ltd. | Digital transport of data over distributed antenna network |
| US20170250927A1 (en) | 2013-12-23 | 2017-08-31 | Dali Systems Co. Ltd. | Virtual radio access network using software-defined network of remotes and digital multiplexing switches |
| KR20160106089A (ko) | 2014-01-06 | 2016-09-09 | 달리 시스템즈 씨오. 엘티디. | 분산형 안테나 네트워크를 위한 네트워크 스위치 |
| CN104796364B (zh) * | 2014-01-16 | 2018-02-27 | 京信通信系统（中国）有限公司 | 一种预失真参数求取方法及预失真处理系统 |
| US10284296B2 (en) * | 2014-02-13 | 2019-05-07 | Dali Systems Co. Ltd. | System and method for performance optimization in and through a distributed antenna system |
| WO2015126828A1 (en) * | 2014-02-18 | 2015-08-27 | Commscope Technologiees Llc | Selectively combining uplink signals in distributed antenna systems |
| US10045306B2 (en) | 2014-02-21 | 2018-08-07 | Commscope Technologies Llc | Self-optimizing network entity for a telecommunications system |
| US9775123B2 (en) | 2014-03-28 | 2017-09-26 | Corning Optical Communications Wireless Ltd. | Individualized gain control of uplink paths in remote units in a distributed antenna system (DAS) based on individual remote unit contribution to combined uplink power |
| WO2015151086A1 (en) * | 2014-03-31 | 2015-10-08 | Corning Optical Communications Wireless Ltd. | Distributed antenna system continuity |
| EP3407675B1 (en) | 2014-04-15 | 2022-03-09 | CommScope Technologies LLC | Wideband remote unit for distributed antenna system |
| WO2015163800A1 (en) * | 2014-04-24 | 2015-10-29 | Telefonaktiebolaget L M Ericsson (Publ) | Compensation for non-linearity in a radio frequency power amplifier |
| US9408092B2 (en) * | 2014-05-23 | 2016-08-02 | Verizon Patent And Licensing Inc. | RAN performance through digital signal processing between baseband unit and remote radio heads |
| US9628119B2 (en) | 2014-06-27 | 2017-04-18 | Nxp Usa, Inc. | Adaptive high-order nonlinear function approximation using time-domain volterra series to provide flexible high performance digital pre-distortion |
| US9252821B2 (en) | 2014-06-27 | 2016-02-02 | Freescale Semiconductor, Inc. | Adaptive high-order nonlinear function approximation using time-domain volterra series to provide flexible high performance digital pre-distortion |
| US9525472B2 (en) | 2014-07-30 | 2016-12-20 | Corning Incorporated | Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US9730228B2 (en) | 2014-08-29 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Individualized gain control of remote uplink band paths in a remote unit in a distributed antenna system (DAS), based on combined uplink power level in the remote unit |
| US10396917B2 (en) | 2014-09-23 | 2019-08-27 | Axell Wireless Ltd. | Automatic mapping and handling PIM and other uplink interferences in digital distributed antenna systems |
| US9184960B1 (en) | 2014-09-25 | 2015-11-10 | Corning Optical Communications Wireless Ltd | Frequency shifting a communications signal(s) in a multi-frequency distributed antenna system (DAS) to avoid or reduce frequency interference |
| US9420542B2 (en) | 2014-09-25 | 2016-08-16 | Corning Optical Communications Wireless Ltd | System-wide uplink band gain control in a distributed antenna system (DAS), based on per band gain control of remote uplink paths in remote units |
| US10659163B2 (en) | 2014-09-25 | 2020-05-19 | Corning Optical Communications LLC | Supporting analog remote antenna units (RAUs) in digital distributed antenna systems (DASs) using analog RAU digital adaptors |
| JP2016072696A (ja) | 2014-09-26 | 2016-05-09 | 富士通株式会社 | 歪み補償装置及び歪み補償方法 |
| WO2016071902A1 (en) | 2014-11-03 | 2016-05-12 | Corning Optical Communications Wireless Ltd. | Multi-band monopole planar antennas configured to facilitate improved radio frequency (rf) isolation in multiple-input multiple-output (mimo) antenna arrangement |
| WO2016075696A1 (en) | 2014-11-13 | 2016-05-19 | Corning Optical Communications Wireless Ltd. | Analog distributed antenna systems (dass) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (rf) communications signals |
| US9729267B2 (en) | 2014-12-11 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting |
| WO2016098111A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital- analog interface modules (da!ms) for flexibly.distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
| WO2016098109A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital interface modules (dims) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
| AU2015371287A1 (en) | 2014-12-23 | 2017-06-08 | Axell Wireless Ltd. | Harmonizing noise aggregation and noise management in distributed antenna system |
| US9362942B1 (en) * | 2015-01-12 | 2016-06-07 | Maxim Integrated Products, Inc. | System characteristic identification systems and methods |
| KR102299089B1 (ko) | 2015-02-02 | 2021-09-07 | 삼성전자 주식회사 | 무선 통신 시스템에서 무선 주파수 유닛의 입출력 신호 동기화 방법 및 장치 |
| US10334572B2 (en) | 2015-02-05 | 2019-06-25 | Commscope Technologies Llc | Systems and methods for emulating uplink diversity signals |
| US10355895B2 (en) | 2015-03-11 | 2019-07-16 | Phluido, Inc. | Baseband unit with adaptive fronthaul link for a distributed radio access network |
| WO2016149328A1 (en) | 2015-03-16 | 2016-09-22 | Commscope Technologies Llc | Das management by radio access network node |
| CN104796091B (zh) * | 2015-04-13 | 2017-12-12 | 南京理工大学 | 基于分段记忆多项式的功率放大器建模及数字预失真方法 |
| US9484962B1 (en) * | 2015-06-05 | 2016-11-01 | Infineon Technologies Ag | Device and method for adaptive digital pre-distortion |
| US9712343B2 (en) | 2015-06-19 | 2017-07-18 | Andrew Wireless Systems Gmbh | Scalable telecommunications system |
| CN105024960B (zh) * | 2015-06-23 | 2018-11-09 | 大唐移动通信设备有限公司 | 一种dpd系统 |
| AU2016307964B2 (en) * | 2015-08-14 | 2020-07-16 | Viasat, Inc. | Digital dynamic bias circuit |
| CN106507462B (zh) * | 2015-09-07 | 2019-11-29 | 大唐移动通信设备有限公司 | 一种射频拉远单元rru下行功率的检测方法和装置 |
| CN107735968B (zh) * | 2015-09-30 | 2019-11-29 | 华为技术有限公司 | 传输信号的装置和方法 |
| WO2017070635A1 (en) | 2015-10-22 | 2017-04-27 | Phluido, Inc. | Virtualization and orchestration of a radio access network |
| CN105356855B (zh) * | 2015-11-03 | 2018-03-13 | 南京邮电大学 | 一种可调的分布式放大器电路 |
| CN105305979B (zh) * | 2015-11-03 | 2018-03-06 | 南京邮电大学 | 一种改善线性度的分布式放大器电路 |
| US9590668B1 (en) | 2015-11-30 | 2017-03-07 | NanoSemi Technologies | Digital compensator |
| CN105631540A (zh) * | 2015-12-27 | 2016-06-01 | 哈尔滨米米米业科技有限公司 | 一种基于和声搜索算法的水下潜器路径规划系统 |
| US10638326B2 (en) | 2016-02-19 | 2020-04-28 | Corning Optical Communications LLC | Long term evolution (LTE) system operating in an unlicensed spectral band with active network discovery and optimization of the unlicensed channels |
| KR101791636B1 (ko) * | 2016-03-28 | 2017-10-30 | 주식회사 쏠리드 | 기지국 신호 정합 장치, 이를 포함하는 기지국 인터페이스 유닛 및 분산 안테나 시스템 |
| US10236924B2 (en) * | 2016-03-31 | 2019-03-19 | Corning Optical Communications Wireless Ltd | Reducing out-of-channel noise in a wireless distribution system (WDS) |
| CN109845394B (zh) * | 2016-05-12 | 2022-04-12 | 大力系统有限公司 | 公共安全分布式天线系统中的冗余 |
| US10164675B2 (en) | 2016-05-27 | 2018-12-25 | Corning Incorporated | Wideband digital distributed communications system(s) (DCS) employing programmable digital signal processing circuit for scaling supported communications services |
| CN106226784B (zh) * | 2016-06-27 | 2019-02-01 | 广东工业大学 | 卫星定位增强系统中的参考基站智能动态管理系统及方法 |
| WO2018017468A1 (en) | 2016-07-18 | 2018-01-25 | Phluido, Inc. | Synchronization of radio units in radio access networks |
| US10141937B2 (en) * | 2016-08-09 | 2018-11-27 | Andapt, Inc. | Pulse-width modulation (PWM) control loop for power application |
| JP6790665B2 (ja) * | 2016-09-26 | 2020-11-25 | 日本電気株式会社 | 校正回路、校正方法及びプログラム |
| US10185849B2 (en) | 2016-10-07 | 2019-01-22 | Intermec, Inc. | Systems and methods for controlling antennas |
| US10812166B2 (en) | 2016-10-07 | 2020-10-20 | Nanosemi, Inc. | Beam steering digital predistortion |
| JP6738019B2 (ja) * | 2016-10-21 | 2020-08-12 | アイコム株式会社 | 送信機および歪補正方法 |
| TWI814236B (zh) * | 2016-10-27 | 2023-09-01 | 美商李爾登公司 | 用於散佈無線電頭端之系統及方法 |
| US9866269B1 (en) * | 2016-11-17 | 2018-01-09 | Xilinx, Inc. | Method of and circuit for predistortion for a power amplifier |
| US10348405B2 (en) * | 2016-11-21 | 2019-07-09 | Corning Incorporated | Multi-functional units incorporating lighting capabilities in converged networks |
| US9979422B1 (en) * | 2016-12-15 | 2018-05-22 | National Chung Shan Institute Of Science And Technology | Adaptive digital pre-distortion system |
| IT201600131387A1 (it) * | 2016-12-27 | 2018-06-27 | Teko Telecom S R L | Unita’ radio remota riconfigurabile per sistemi distribuiti d’antenna |
| EP3494675B1 (en) | 2017-02-15 | 2020-02-19 | Maven Wireless Sweden AB | Distributed antenna system providing redundancy |
| WO2018156932A1 (en) | 2017-02-25 | 2018-08-30 | Nanosemi, Inc. | Multiband digital predistorter |
| WO2018170862A1 (zh) | 2017-03-23 | 2018-09-27 | 深圳市大疆创新科技有限公司 | 飞行器及其外部设备、通信方法、装置与系统 |
| US10135706B2 (en) | 2017-04-10 | 2018-11-20 | Corning Optical Communications LLC | Managing a communications system based on software defined networking (SDN) architecture |
| US10141961B1 (en) | 2017-05-18 | 2018-11-27 | Nanosemi, Inc. | Passive intermodulation cancellation |
| JP2018207184A (ja) * | 2017-05-30 | 2018-12-27 | パナソニックＩｐマネジメント株式会社 | 施設内伝送システム、施設内伝送方法及び基地局 |
| US10931318B2 (en) * | 2017-06-09 | 2021-02-23 | Nanosemi, Inc. | Subsampled linearization system |
| US10581470B2 (en) | 2017-06-09 | 2020-03-03 | Nanosemi, Inc. | Linearization system |
| CN109039969B (zh) * | 2017-06-09 | 2020-11-27 | 中国工程物理研究院电子工程研究所 | 宽带数字预失真器的实现方法 |
| US11115067B2 (en) * | 2017-06-09 | 2021-09-07 | Nanosemi, Inc. | Multi-band linearization system |
| US10339346B2 (en) | 2017-06-26 | 2019-07-02 | Intermec, Inc. | Systems and methods for a reconfigurable antenna |
| US10075201B1 (en) * | 2017-07-12 | 2018-09-11 | Intel IP Corporation | Adaptive nonlinear system control using robust and low-complexity coefficient estimation |
| WO2019014422A1 (en) | 2017-07-12 | 2019-01-17 | Nanosemi, Inc. | SYSTEMS AND METHODS FOR CONTROLLING RADIOS MADE WITH DIGITAL PREDISTORSION |
| WO2019054980A1 (en) | 2017-09-12 | 2019-03-21 | Intel Corporation | DIGITAL PREDISTORTION OF SIGNALS |
| US11303251B2 (en) | 2017-10-02 | 2022-04-12 | Nanosemi, Inc. | Digital predistortion adjustment based on determination of load condition characteristics |
| US11564188B2 (en) | 2017-10-17 | 2023-01-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Distributed MIMO synchronization |
| US11616540B2 (en) | 2017-11-21 | 2023-03-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Antenna arrangement for distributed massive MIMO |
| CN108037752B (zh) * | 2017-11-30 | 2020-01-17 | 中国航空工业集团公司沈阳飞机设计研究所 | 一种两余度前轮转弯监控方法 |
| CN108235451A (zh) * | 2017-12-07 | 2018-06-29 | 姬军生 | 一种一体化便携专网基站系统 |
| CN108063739A (zh) * | 2017-12-15 | 2018-05-22 | 北京卫星信息工程研究所 | 宽带数字通信系统发射端功放自适应数字预失真方法 |
| US12016084B2 (en) | 2018-01-04 | 2024-06-18 | Commscope Technologies Llc | Management of a split physical layer in a radio area network |
| CN108650048B (zh) * | 2018-04-03 | 2019-12-31 | 广州大学 | 一种高精度数字阵列多通道延时补偿方法 |
| JP2021523629A (ja) | 2018-05-11 | 2021-09-02 | ナノセミ， インク．Ｎａｎｏｓｅｍｉ， Ｉｎｃ． | 非線形システム用デジタル補償器 |
| US10644657B1 (en) | 2018-05-11 | 2020-05-05 | Nanosemi, Inc. | Multi-band digital compensator for a non-linear system |
| JP2019201361A (ja) * | 2018-05-17 | 2019-11-21 | 富士通株式会社 | 歪補償装置および歪補償方法 |
| US10931238B2 (en) | 2018-05-25 | 2021-02-23 | Nanosemi, Inc. | Linearization with envelope tracking or average power tracking |
| US11863210B2 (en) | 2018-05-25 | 2024-01-02 | Nanosemi, Inc. | Linearization with level tracking |
| JP2021524692A (ja) | 2018-05-25 | 2021-09-13 | ナノセミ， インク．Ｎａｎｏｓｅｍｉ， Ｉｎｃ． | 様々な動作条件におけるデジタルプレディストーション |
| KR102452622B1 (ko) * | 2018-06-11 | 2022-10-07 | 삼성전자주식회사 | 등화기 및 이를 포함하는 송신기 |
| US10791475B2 (en) * | 2018-11-06 | 2020-09-29 | Corning Optical Communications LLC | Systems and methods for performance evaluations in distributed antenna systems (DASs) |
| DE102018220089A1 (de) * | 2018-11-22 | 2020-05-28 | Infineon Technologies Ag | Digitale Vorverzerrungstechnik für eine Schaltungsanordnung mit einem Leistungsverstärker |
| US10985951B2 (en) | 2019-03-15 | 2021-04-20 | The Research Foundation for the State University | Integrating Volterra series model and deep neural networks to equalize nonlinear power amplifiers |
| CN110289869B (zh) * | 2019-05-25 | 2021-01-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | 超短波功放数字预失真模型 |
| US11405582B2 (en) | 2019-06-28 | 2022-08-02 | Meta Platforms, Inc. | Preprocessing of high-dynamic-range video using a hybrid lookup table scheme |
| US10887079B1 (en) | 2019-09-26 | 2021-01-05 | Corning Research & Development Corporation | Digital predistortion (DPD) timing alignment in a remote unit(s) for a wireless communications system (WCS) |
| US11418277B2 (en) * | 2019-11-15 | 2022-08-16 | Solid, Inc. | Optical communication system and method of monitoring thereof |
| US11317301B2 (en) | 2019-11-18 | 2022-04-26 | Commscope Technologies Llc | Systems and methods for a multiple-operator distributed antenna system |
| US20230155632A1 (en) * | 2020-04-24 | 2023-05-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Failsafe Series-Connected Radio System |
| US10992326B1 (en) | 2020-05-19 | 2021-04-27 | Nanosemi, Inc. | Buffer management for adaptive digital predistortion |
| US11190230B1 (en) | 2020-05-29 | 2021-11-30 | Corning Research & Development Corporation | Wide bandwidth digital pre-distortion (DPD) in a remote unit(s) for a wireless communications system (WCS) |
| US12009845B2 (en) * | 2020-07-14 | 2024-06-11 | Intel Corporation | Concept for an RF frontend |
| FR3115179B1 (fr) * | 2020-10-09 | 2023-10-20 | St Microelectronics Srl | Procédé de linéarisation d’un signal de transmission et circuit intégré correspondant |
| CN114499708B (zh) * | 2020-10-27 | 2024-06-21 | 普罗斯通信技术（苏州）有限公司 | 一种射频拉远单元的测试系统及方法 |
| CN112583370B (zh) * | 2020-12-10 | 2023-03-21 | 中国工程物理研究院电子工程研究所 | 一种具有高效率和高线性度的功率放大装置 |
| US11251819B1 (en) * | 2020-12-23 | 2022-02-15 | Xilinx, Inc. | Thermal effect mitigation for digital pre-distortion |
| US11818808B2 (en) * | 2021-01-29 | 2023-11-14 | Dali Systems Co. Ltd. | Redundant distributed antenna system (DAS) with failover capability |
| CN112996019B (zh) * | 2021-03-01 | 2021-08-27 | 军事科学院系统工程研究院网络信息研究所 | 基于多目标优化的太赫兹频段分布式星群接入控制方法 |
| JP7418619B2 (ja) * | 2021-03-05 | 2024-01-19 | 三菱電機株式会社 | 歪み補償回路のための学習装置、及び歪み補償回路 |
| US11942899B2 (en) | 2021-06-18 | 2024-03-26 | Qorvo Us, Inc. | Envelope tracking voltage correction in a transmission circuit |
| US12057813B2 (en) | 2021-06-18 | 2024-08-06 | Qorvo Us, Inc. | Wideband transmission circuit |
| IL311085A (en) * | 2021-08-27 | 2024-04-01 | Aciist Smart Networks Ltd | Implementation of a two-switch distributed layer |
| US20230080621A1 (en) * | 2021-09-16 | 2023-03-16 | Qorvo Us, Inc. | Phase and amplitude error correction in a transmission circuit |
| US11906992B2 (en) | 2021-09-16 | 2024-02-20 | Qorvo Us, Inc. | Distributed power management circuit |
| US11962338B2 (en) | 2021-09-16 | 2024-04-16 | Qorvo Us, Inc. | Equalization filter calibration in a transceiver circuit |
| CN114421902B (zh) * | 2022-01-21 | 2023-06-06 | 上海物骐微电子有限公司 | 适用于WiFi无记忆功放的预失真校准方法及应用 |
| CN114520993B (zh) * | 2022-03-08 | 2024-01-05 | 沈阳中科奥维科技股份有限公司 | 基于信道质量监测的无线传输系统网络自优化方法 |
| CN115278746B (zh) * | 2022-07-28 | 2023-03-28 | 北京邮电大学 | 面向5g宽带功放的自适应快速误差修正数字预失真方法 |
Family Cites Families (517)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4700151A (en) | 1985-03-20 | 1987-10-13 | Nec Corporation | Modulation system capable of improving a transmission system |
| US4638248A (en) | 1985-06-10 | 1987-01-20 | Massachusetts Institute Of Technology | Methods and apparatus for measuring relative gain and phase of voltage input signals versus voltage output signals |
| DE3604893A1 (de) | 1986-02-15 | 1987-08-20 | Honeywell Elac Nautik Gmbh | Verfahren und vorrichtung zum feststellen geringfuegiger mengen von gasen oder daempfen in gasgemischen |
| US4755795A (en) | 1986-10-31 | 1988-07-05 | Hewlett-Packard Company | Adaptive sample rate based on input signal bandwidth |
| GB2204202B (en) | 1987-04-28 | 1991-11-27 | Racal Communications Equip | Radio transmitters |
| GB8826476D0 (en) | 1988-11-11 | 1988-12-14 | British Telecomm | Communications system |
| US5121412A (en) * | 1989-01-03 | 1992-06-09 | Motorola, Inc. | All-digital quadrature modulator |
| US4929906A (en) | 1989-01-23 | 1990-05-29 | The Boeing Company | Amplifier linearization using down/up conversion |
| FR2642243B1 (fr) | 1989-01-24 | 1991-04-19 | Labo Electronique Physique | Circuit de predistorsion adaptative |
| US5132639A (en) | 1989-09-07 | 1992-07-21 | Ortel Corporation | Predistorter for linearization of electronic and optical signals |
| FR2652965A1 (fr) | 1989-10-06 | 1991-04-12 | Philips Electronique Lab | Dispositif de predistorsion pour systeme de transmission numerique. |
| US4999831A (en) | 1989-10-19 | 1991-03-12 | United Telecommunications, Inc. | Synchronous quantized subcarrier multiplexer for digital transport of video, voice and data |
| US5049832A (en) | 1990-04-20 | 1991-09-17 | Simon Fraser University | Amplifier linearization by adaptive predistortion |
| JPH04207532A (ja) | 1990-11-30 | 1992-07-29 | Nippon Telegr & Teleph Corp <Ntt> | 通信装置 |
| US5678198A (en) | 1991-05-22 | 1997-10-14 | Southwestern Bell Technology Resources, Inc. | System for controlling signal level at both ends of a transmission link, based upon a detected value |
| CA2066540C (en) | 1991-06-13 | 1998-01-20 | Edwin A. Kelley | Multiple user digital receiving apparatus and method with time division multiplexing |
| JPH05136724A (ja) | 1991-11-15 | 1993-06-01 | A T R Koudenpa Tsushin Kenkyusho:Kk | 移動体無線通信システム |
| GB2268364B (en) | 1992-06-25 | 1995-10-11 | Roke Manor Research | Improvements in or relating to radio communication systems |
| US5627879A (en) | 1992-09-17 | 1997-05-06 | Adc Telecommunications, Inc. | Cellular communications system with centralized base stations and distributed antenna units |
| JP2883260B2 (ja) | 1993-04-20 | 1999-04-19 | 三菱電機株式会社 | 歪補償回路 |
| JP3156439B2 (ja) | 1993-04-20 | 2001-04-16 | 三菱電機株式会社 | 歪補償回路 |
| US7924783B1 (en) | 1994-05-06 | 2011-04-12 | Broadcom Corporation | Hierarchical communications system |
| US5619202A (en) | 1994-11-22 | 1997-04-08 | Analog Devices, Inc. | Variable sample rate ADC |
| IT1265271B1 (it) | 1993-12-14 | 1996-10-31 | Alcatel Italia | Sistema di predistorsione in banda base per la linearizzazione adattativa di amplificatori di potenza |
| US5457557A (en) | 1994-01-21 | 1995-10-10 | Ortel Corporation | Low cost optical fiber RF signal distribution system |
| US5452473A (en) | 1994-02-28 | 1995-09-19 | Qualcomm Incorporated | Reverse link, transmit power correction and limitation in a radiotelephone system |
| US5973011A (en) | 1994-03-30 | 1999-10-26 | Isis Pharma Gmbh | Pharmaceutical preparations and medicaments for the prevention and treatment of endothelial dysfunction |
| US5579342A (en) | 1994-09-22 | 1996-11-26 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Communications | Pre-compensated frequency modulation (PFM) |
| US5579341A (en) | 1994-12-29 | 1996-11-26 | Motorola, Inc. | Multi-channel digital transceiver and method |
| US5748683A (en) | 1994-12-29 | 1998-05-05 | Motorola, Inc. | Multi-channel transceiver having an adaptive antenna array and method |
| US5486789A (en) | 1995-02-28 | 1996-01-23 | Motorola, Inc. | Apparatus and method for providing a baseband digital error signal in an adaptive predistorter |
| JP2967699B2 (ja) | 1995-03-06 | 1999-10-25 | 日本電気株式会社 | 送信装置 |
| US5596600A (en) * | 1995-04-06 | 1997-01-21 | Mayflower Communications Company, Inc. | Standalone canceller of narrow band interference for spread spectrum receivers |
| FI98014C (fi) | 1995-06-30 | 1997-03-25 | Nokia Mobile Phones Ltd | Kuutiointipiiri signaalin esisäröyttämiseksi |
| US5870668A (en) | 1995-08-18 | 1999-02-09 | Fujitsu Limited | Amplifier having distortion compensation and base station for radio communication using the same |
| US6356555B1 (en) | 1995-08-25 | 2002-03-12 | Terayon Communications Systems, Inc. | Apparatus and method for digital data transmission using orthogonal codes |
| US5903823A (en) | 1995-09-19 | 1999-05-11 | Fujitsu Limited | Radio apparatus with distortion compensating function |
| US5589797A (en) | 1995-09-26 | 1996-12-31 | Lucent Technologies Inc. | Low distortion amplifier |
| US6005884A (en) | 1995-11-06 | 1999-12-21 | Ems Technologies, Inc. | Distributed architecture for a wireless data communications system |
| US5794153A (en) | 1995-12-26 | 1998-08-11 | Lucent Technologies Inc. | Estimating PCS traffic from radio port measurements |
| US5675287A (en) | 1996-02-12 | 1997-10-07 | Motorola, Inc. | Digital DC correction circuit for a linear transmitter |
| US5880863A (en) | 1996-02-13 | 1999-03-09 | Gte Laboratories Incorporated | Reconfigurable ring system for the transport of RF signals over optical fibers |
| US5732333A (en) | 1996-02-14 | 1998-03-24 | Glenayre Electronics, Inc. | Linear transmitter using predistortion |
| US5937011A (en) | 1996-03-26 | 1999-08-10 | Airnet Communications Corp. | Multi-carrier high power amplifier using digital pre-distortion |
| US5740520A (en) | 1996-04-03 | 1998-04-14 | State Of Israel | Channel correction transceiver |
| JP2738385B2 (ja) | 1996-04-15 | 1998-04-08 | 日本電気株式会社 | 可変帯域幅周波数分割多重通信方式 |
| JPH09284149A (ja) | 1996-04-17 | 1997-10-31 | Nec Corp | 電力増幅部の自動利得制御回路 |
| US5831479A (en) | 1996-06-13 | 1998-11-03 | Motorola, Inc. | Power delivery system and method of controlling the power delivery system for use in a radio frequency system |
| US6314142B1 (en) | 1996-06-19 | 2001-11-06 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Pre-distortion for a non-linear transmission path in the high frequency range |
| US5757229A (en) | 1996-06-28 | 1998-05-26 | Motorola, Inc. | Bias circuit for a power amplifier |
| US6055418A (en) | 1996-07-05 | 2000-04-25 | Thomcast Communications, Inc. | Computer program product configured to control modular transmission system components |
| US5898338A (en) * | 1996-09-20 | 1999-04-27 | Spectrian | Adaptive digital predistortion linearization and feed-forward correction of RF power amplifier |
| US6493335B1 (en) * | 1996-09-24 | 2002-12-10 | At&T Corp. | Method and system for providing low-cost high-speed data services |
| FR2755335B1 (fr) | 1996-10-24 | 1998-11-27 | Alsthom Cge Alcatel | Estimateur du defaut de balance d'un modulateur en quadrature et etage de modulation l'utilisant |
| US6205133B1 (en) | 1996-11-25 | 2001-03-20 | Ericsson Inc. | Flexible wideband architecture for use in radio communications systems |
| US5920808A (en) | 1996-12-12 | 1999-07-06 | Glenayre Electronics, Inc. | Method and apparatus for reducing key-up distortion by pre-heating transistors |
| US6246865B1 (en) | 1997-02-04 | 2001-06-12 | Samsung Electronics Co., Ltd. | Device and method for controlling distortion characteristic of predistorter |
| US6112086A (en) | 1997-02-25 | 2000-08-29 | Adc Telecommunications, Inc. | Scanning RSSI receiver system using inverse fast fourier transforms for a cellular communications system with centralized base stations and distributed antenna units |
| US5923712A (en) | 1997-05-05 | 1999-07-13 | Glenayre Electronics, Inc. | Method and apparatus for linear transmission by direct inverse modeling |
| KR100307665B1 (ko) | 1997-05-23 | 2001-10-19 | 하재홍 | 전자정보키시스템 |
| US6072364A (en) | 1997-06-17 | 2000-06-06 | Amplix | Adaptive digital predistortion for power amplifiers with real time modeling of memoryless complex gains |
| KR100251561B1 (ko) | 1997-06-19 | 2000-04-15 | 윤종용 | 디지털통신시스템의송신기선형화장치및방법 |
| US5810888A (en) | 1997-06-26 | 1998-09-22 | Massachusetts Institute Of Technology | Thermodynamic adaptive phased array system for activating thermosensitive liposomes in targeted drug delivery |
| US6081158A (en) | 1997-06-30 | 2000-06-27 | Harris Corporation | Adaptive pre-distortion apparatus for linearizing an amplifier output within a data transmission system |
| US6639050B1 (en) | 1997-07-21 | 2003-10-28 | Ohio University | Synthetic genes for plant gums and other hydroxyproline-rich glycoproteins |
| US6252461B1 (en) | 1997-08-25 | 2001-06-26 | Frederick Herbert Raab | Technique for wideband operation of power amplifiers |
| US5959499A (en) | 1997-09-30 | 1999-09-28 | Motorola, Inc. | Predistortion system and method using analog feedback loop for look-up table training |
| US6393007B1 (en) | 1997-10-16 | 2002-05-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Method of and a system for voice and data radio communication providing improved interference diversity |
| US5936464A (en) | 1997-11-03 | 1999-08-10 | Motorola, Inc. | Method and apparatus for reducing distortion in a high efficiency power amplifier |
| US6005506A (en) | 1997-12-09 | 1999-12-21 | Qualcomm, Incorporated | Receiver with sigma-delta analog-to-digital converter for sampling a received signal |
| JP3171157B2 (ja) | 1997-12-10 | 2001-05-28 | 松下電器産業株式会社 | 非線形歪補償装置 |
| US5963549A (en) * | 1997-12-10 | 1999-10-05 | L-3 Communications Corporation | Fixed wireless loop system having baseband combiner predistortion summing table |
| US6252912B1 (en) | 1997-12-24 | 2001-06-26 | General Dynamics Government Systems Corporation | Adaptive predistortion system |
| US5959500A (en) | 1998-01-26 | 1999-09-28 | Glenayre Electronics, Inc. | Model-based adaptive feedforward amplifier linearizer |
| US6215354B1 (en) | 1998-03-06 | 2001-04-10 | Fujant, Inc. | Closed loop calibration for an amplitude reconstruction amplifier |
| GB9804835D0 (en) | 1998-03-06 | 1998-04-29 | Wireless Systems Int Ltd | Predistorter |
| US6300956B1 (en) | 1998-03-17 | 2001-10-09 | Pixar Animation | Stochastic level of detail in computer animation |
| US6288610B1 (en) | 1998-03-19 | 2001-09-11 | Fujitsu Limited | Method and apparatus for correcting signals, apparatus for compensating for distortion, apparatus for preparing distortion compensating data, and transmitter |
| FI105506B (fi) | 1998-04-30 | 2000-08-31 | Nokia Networks Oy | Vahvistimen linearisointimenetelmä ja vahvistinjärjestely |
| US5999990A (en) | 1998-05-18 | 1999-12-07 | Motorola, Inc. | Communicator having reconfigurable resources |
| GB9811381D0 (en) | 1998-05-27 | 1998-07-22 | Nokia Mobile Phones Ltd | Predistortion control for power reduction |
| US6054896A (en) * | 1998-12-17 | 2000-04-25 | Datum Telegraphic Inc. | Controller and associated methods for a linc linear power amplifier |
| US6373611B1 (en) | 1998-06-22 | 2002-04-16 | Scientific-Atlanta, Inc. | Digital optical transmitter |
| US6600792B2 (en) | 1998-06-26 | 2003-07-29 | Qualcomm Incorporated | Predistortion technique for high power amplifiers |
| US6266531B1 (en) | 1998-07-01 | 2001-07-24 | Ericsson Inc. | System and method for adaptive thresholds for cell load sharing |
| US6253094B1 (en) | 1998-07-09 | 2001-06-26 | Airnet Communications Corporation | Sectorized cell having non-redundant broadband processing unit |
| KR100326176B1 (ko) | 1998-08-06 | 2002-04-17 | 윤종용 | 이동통신시스템의전력증폭장치및방법 |
| US6124758A (en) | 1998-08-19 | 2000-09-26 | Harris Corporation | RF power amplifier control system |
| US6430402B1 (en) | 1998-09-14 | 2002-08-06 | Conexant Systems, Inc. | Power amplifier saturation prevention method, apparatus, and communication system incorporating the same |
| US6594253B1 (en) | 1998-09-29 | 2003-07-15 | Ericsson Inc. | System and method for mobility management for an internet telephone call to a mobile terminal |
| US6315189B1 (en) | 1998-10-13 | 2001-11-13 | Texas Instruments Incorporated | Semiconductor package lead plating method and apparatus |
| US6301579B1 (en) | 1998-10-20 | 2001-10-09 | Silicon Graphics, Inc. | Method, system, and computer program product for visualizing a data structure |
| WO2000023956A1 (en) | 1998-10-22 | 2000-04-27 | University Of Maryland | Method and system for providing location dependent and personal identification information to a public safety answering point |
| FI105612B (fi) | 1998-10-23 | 2000-09-15 | Nokia Networks Oy | Menetelmä ja kytkentä vaihevirheen korjaamiseksi tehovahvistimen linearisointisilmukassa |
| US6275685B1 (en) | 1998-12-10 | 2001-08-14 | Nortel Networks Limited | Linear amplifier arrangement |
| KR20000039780A (ko) | 1998-12-16 | 2000-07-05 | 김영환 | 알티유를 이용한 디지털-주파수 공용통신 기지국 감시제어 시스템 |
| US6236267B1 (en) | 1998-12-29 | 2001-05-22 | International Business Machines Corporation | Linearization for power amplifiers using feed-forward and feedback control |
| US6166601A (en) | 1999-01-07 | 2000-12-26 | Wiseband Communications Ltd. | Super-linear multi-carrier power amplifier |
| US6356369B1 (en) | 1999-02-22 | 2002-03-12 | Scientific-Atlanta, Inc. | Digital optical transmitter for processing externally generated information in the reverse path |
| JP2000278237A (ja) | 1999-03-25 | 2000-10-06 | Toshiba Corp | Ｏｆｄｍ用中継装置 |
| FI990680A (fi) | 1999-03-26 | 2000-09-27 | Nokia Networks Oy | I/Q-modulaattorin epälineaarisuuden korjaus |
| JP2000278166A (ja) | 1999-03-26 | 2000-10-06 | Nec Corp | ソフトウエア携帯電話機 |
| GB2348755B (en) | 1999-04-01 | 2001-03-07 | Wireless Systems Int Ltd | Signal processing |
| US6657993B1 (en) * | 1999-05-11 | 2003-12-02 | Lucent Technologies Inc. | System and method for variable bandwidth transmission facilities between a local telephone switch and a remote line unit |
| US6614854B1 (en) | 1999-05-28 | 2003-09-02 | Carriercomm, Inc. | System and method for adaptive predistortion |
| IT1313906B1 (it) | 1999-06-15 | 2002-09-26 | Cit Alcatel | Precorrezione digitale adattiva di non-linearita' introdotte daamplicatori di potenza. |
| US6724737B1 (en) | 1999-06-17 | 2004-04-20 | Lockheed Martin Global Telecommunications, Inc | System for controlling communications between a terminal and satellite and method therefore |
| GB2351624B (en) | 1999-06-30 | 2003-12-03 | Wireless Systems Int Ltd | Reducing distortion of signals |
| JP2001016116A (ja) | 1999-07-02 | 2001-01-19 | Nec Corp | 携帯無線機 |
| US6587514B1 (en) | 1999-07-13 | 2003-07-01 | Pmc-Sierra, Inc. | Digital predistortion methods for wideband amplifiers |
| US6697436B1 (en) | 1999-07-13 | 2004-02-24 | Pmc-Sierra, Inc. | Transmission antenna array system with predistortion |
| US6356146B1 (en) * | 1999-07-13 | 2002-03-12 | Pmc-Sierra, Inc. | Amplifier measurement and modeling processes for use in generating predistortion parameters |
| US7409007B1 (en) | 1999-09-14 | 2008-08-05 | Lucent Technologies Inc. | Method and apparatus for reducing adjacent channel power in wireless communication systems |
| EP1085773A1 (en) | 1999-09-20 | 2001-03-21 | Nortel Matra Cellular | Mobile telecommunications network with distributed base stations |
| US6246286B1 (en) | 1999-10-26 | 2001-06-12 | Telefonaktiebolaget Lm Ericsson | Adaptive linearization of power amplifiers |
| JP3381689B2 (ja) | 1999-11-30 | 2003-03-04 | 日本電気株式会社 | 非線形歪み補償回路及びそれを用いた送信装置並びに移動通信機 |
| US7257328B2 (en) | 1999-12-13 | 2007-08-14 | Finisar Corporation | System and method for transmitting data on return path of a cable television system |
| US6697603B1 (en) | 1999-12-13 | 2004-02-24 | Andrew Corporation | Digital repeater |
| JP4183364B2 (ja) | 1999-12-28 | 2008-11-19 | 富士通株式会社 | 歪補償装置 |
| JP4014343B2 (ja) | 1999-12-28 | 2007-11-28 | 富士通株式会社 | 歪補償装置 |
| US6751447B1 (en) | 1999-12-30 | 2004-06-15 | Samsung Electronics Cop., Ltd. | Adaptive digital pre-distortion circuit using output reference signal and method of operation |
| US7260620B1 (en) | 2000-01-05 | 2007-08-21 | Cisco Technology, Inc. | System for selecting the operating frequency of a communication device in a wireless network |
| US6359504B1 (en) | 2000-01-28 | 2002-03-19 | Lucent Technologies Inc. | Power amplifier using upstream signal information |
| WO2001056197A2 (en) | 2000-01-28 | 2001-08-02 | Scientific-Atlanta, Inc. | Digital downstream communication system |
| JP3578957B2 (ja) | 2000-02-03 | 2004-10-20 | 株式会社日立国際電気 | 増幅装置 |
| US6242979B1 (en) | 2000-02-23 | 2001-06-05 | Motorola, Inc. | Linearization using parallel cancellation in linear power amplifier |
| GB2359679B (en) | 2000-02-24 | 2004-03-10 | Wireless Systems Int Ltd | Amplifier |
| GB2359681B (en) | 2000-02-25 | 2004-03-10 | Wireless Systems Int Ltd | Switched amplifier |
| JP4346200B2 (ja) | 2000-03-17 | 2009-10-21 | 株式会社東芝 | 地上波放送制御システム |
| EP1269776B1 (en) | 2000-03-27 | 2009-07-01 | OpenCell Corp. | System for distributing multi-protocol radio frequency signals |
| US6741662B1 (en) | 2000-04-17 | 2004-05-25 | Intel Corporation | Transmitter linearization using fast predistortion |
| US6980527B1 (en) | 2000-04-25 | 2005-12-27 | Cwill Telecommunications, Inc. | Smart antenna CDMA wireless communication system |
| AU2001239934A1 (en) | 2000-04-27 | 2001-11-12 | Lgc Wireless, Inc. | Adaptive capacity management in a centralized basestation architecture |
| US6353600B1 (en) | 2000-04-29 | 2002-03-05 | Lgc Wireless, Inc. | Dynamic sectorization in a CDMA cellular system employing centralized base-station architecture |
| GB0011326D0 (en) | 2000-05-11 | 2000-06-28 | Nortel Networks Corp | A linear amplifier arrangement |
| DE10025287B4 (de) * | 2000-05-22 | 2006-06-08 | Siemens Ag | Verfahren und Kommunikationssystem zur Schätzung einer Störungs-Kovarianzmatrix für die Abwärtsverbindung in zellularen Mobilfunknetzen mit adaptiven Antennen |
| US6489846B2 (en) | 2000-05-25 | 2002-12-03 | Sony Corporation | Distortion compensating device and distortion compensating method |
| JP4326673B2 (ja) | 2000-06-06 | 2009-09-09 | 富士通株式会社 | 非線形歪補償装置を有する通信装置の起動方法 |
| JP2002009557A (ja) | 2000-06-21 | 2002-01-11 | Matsushita Electric Ind Co Ltd | 線形補償増幅装置 |
| US6704545B1 (en) | 2000-07-19 | 2004-03-09 | Adc Telecommunications, Inc. | Point-to-multipoint digital radio frequency transport |
| US6898252B1 (en) | 2000-07-21 | 2005-05-24 | Intel Corporation | IQ mismatch cancellation |
| US6351189B1 (en) | 2000-07-31 | 2002-02-26 | Nokia Networks Oy | System and method for auto-bias of an amplifier |
| US6804540B1 (en) | 2000-08-02 | 2004-10-12 | Ericsson Inc. | Remote band-pass filter in a distributed antenna system |
| US6639463B1 (en) | 2000-08-24 | 2003-10-28 | Lucent Technologies Inc. | Adaptive power amplifier system and method |
| JP3590571B2 (ja) * | 2000-08-30 | 2004-11-17 | 株式会社日立国際電気 | 歪補償装置 |
| FR2813487B1 (fr) | 2000-08-31 | 2002-11-29 | Cit Alcatel | Procede et dispositif de controle de l'amplification du signal emis par un terminal mobile permettant d'augmenter l'autonomie dudit terminal mobile |
| US6445688B1 (en) | 2000-08-31 | 2002-09-03 | Ricochet Networks, Inc. | Method and apparatus for selecting a directional antenna in a wireless communication system |
| KR100374828B1 (ko) | 2000-09-15 | 2003-03-04 | 엘지전자 주식회사 | 적응성 전치왜곡 송신기 |
| WO2002023956A2 (en) | 2000-09-15 | 2002-03-21 | Teledyne Lighting And Display Products, Inc. | Power supply for light emitting diodes |
| DE10046059A1 (de) | 2000-09-18 | 2002-03-28 | Oskar Bschorr | Flachlautsprecher |
| JP2002111401A (ja) | 2000-10-03 | 2002-04-12 | Fujitsu Ltd | 信号の歪補償装置および歪補償方法 |
| WO2002056481A2 (en) | 2000-10-27 | 2002-07-18 | Chameleon Systems, Inc. | System and method of implementing a wireless communication system using a reconfigurable chip with a reconfigurable fabric |
| CA2362104A1 (en) | 2000-10-30 | 2002-04-30 | Simon Fraser University | High efficiency power amplifier systems and methods |
| US20020179830A1 (en) * | 2000-11-01 | 2002-12-05 | Pearson Robert M. | Halbach Dipole magnet shim system |
| US7072650B2 (en) | 2000-11-13 | 2006-07-04 | Meshnetworks, Inc. | Ad hoc peer-to-peer mobile radio access system interfaced to the PSTN and cellular networks |
| JP3388409B2 (ja) | 2000-11-22 | 2003-03-24 | 国土交通省国土技術政策総合研究所長 | 路側通信網 |
| US6424225B1 (en) | 2000-11-27 | 2002-07-23 | Conexant Systems, Inc. | Power amplifier circuit for providing constant bias current over a wide temperature range |
| US7016332B2 (en) | 2000-12-05 | 2006-03-21 | Science Applications International Corporation | Method and system for a remote downlink transmitter for increasing the capacity of a multiple access interference limited spread-spectrum wireless network |
| US6907490B2 (en) | 2000-12-13 | 2005-06-14 | Intel Corporation | Method and an apparatus for a re-configurable processor |
| GB2370170B (en) * | 2000-12-15 | 2003-01-29 | Ntl Group Ltd | Signal transmission systems |
| KR20020054149A (ko) | 2000-12-27 | 2002-07-06 | 엘지전자 주식회사 | 디지털 전치왜곡기를 갖는 기지국 송신장치 |
| KR100459412B1 (ko) | 2000-12-28 | 2004-12-03 | 엘지전자 주식회사 | 디지털 신호 전송장치를 이용한 ｃｄｍａ 광 중계기 수신장치 |
| US6901256B2 (en) | 2000-12-29 | 2005-05-31 | Sprint Spectrum L.P. | Cellular/PCS CDMA system with pilot beacons for call handoffs |
| US6801767B1 (en) | 2001-01-26 | 2004-10-05 | Lgc Wireless, Inc. | Method and system for distributing multiband wireless communications signals |
| JP3690988B2 (ja) | 2001-02-01 | 2005-08-31 | 株式会社日立国際電気 | プリディストーション歪み補償装置 |
| US7145704B1 (en) | 2003-11-25 | 2006-12-05 | Cheetah Omni, Llc | Optical logic gate based optical router |
| KR100398664B1 (ko) | 2001-02-21 | 2003-09-19 | 주식회사 쏠리테크 | 중간주파수 대역 사전왜곡에 의한 전력 증폭기 선형화 장치 |
| US6983025B2 (en) | 2001-04-11 | 2006-01-03 | Tropian, Inc. | High quality power ramping in a communications transmitter |
| US7283519B2 (en) | 2001-04-13 | 2007-10-16 | Esn, Llc | Distributed edge switching system for voice-over-packet multiservice network |
| WO2002087097A1 (fr) | 2001-04-18 | 2002-10-31 | Fujitsu Limited | Dispositif de correction de distorsion |
| US6404284B1 (en) | 2001-04-19 | 2002-06-11 | Anadigics, Inc. | Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance |
| US9893774B2 (en) | 2001-04-26 | 2018-02-13 | Genghiscomm Holdings, LLC | Cloud radio access network |
| ATE421807T1 (de) | 2001-05-31 | 2009-02-15 | Magnolia Broadband Inc | Kommunikationseinrichtung mit intelligenter antenne, die ein qualitätsanzeigesignal verwendet |
| US6928122B2 (en) | 2001-06-07 | 2005-08-09 | Motorola, Inc. | Amplifier predistortion system and method |
| US6903604B2 (en) | 2001-06-07 | 2005-06-07 | Lucent Technologies Inc. | Method and apparatus for modeling and estimating the characteristics of a power amplifier |
| US6826164B2 (en) | 2001-06-08 | 2004-11-30 | Nextg Networks | Method and apparatus for multiplexing in a wireless communication infrastructure |
| US7035345B2 (en) | 2001-06-08 | 2006-04-25 | Polyvalor S.E.C. | Adaptive predistortion device and method using digital receiver |
| WO2002102102A1 (en) | 2001-06-08 | 2002-12-19 | Nextg Networks | Network and methof for connecting antennas to base stations in a wireless communication network using space diversity |
| US20020191565A1 (en) | 2001-06-08 | 2002-12-19 | Sanjay Mani | Methods and systems employing receive diversity in distributed cellular antenna applications |
| US7127175B2 (en) | 2001-06-08 | 2006-10-24 | Nextg Networks | Method and apparatus for multiplexing in a wireless communication infrastructure |
| GB2376583B (en) | 2001-06-15 | 2005-01-05 | Wireless Systems Int Ltd | Time alignment of signals |
| US7068984B2 (en) | 2001-06-15 | 2006-06-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Systems and methods for amplification of a communication signal |
| US7203247B2 (en) | 2001-07-23 | 2007-04-10 | Agere Systems Inc. | Digital predistortion technique for WCDMA wireless communication system and method of operation thereof |
| EP1282328A1 (de) | 2001-07-27 | 2003-02-05 | Alcatel | Verfahren zum Aufbau von Telekommunikationsverbindungen im Anschlussbereich einer Teilnehmervermittlungsstelle, Teilnehmeranschlusssystem, Teilnehmervermittlungsstelle und Vorfeldeinrichtung |
| KR100422133B1 (ko) | 2001-07-27 | 2004-03-12 | 엘지전자 주식회사 | 광대역 무선가입자망 시스템의 패킷데이터 처리장치 및 그방법 |
| US7158765B2 (en) | 2001-07-31 | 2007-01-02 | Agere Systems, Inc. | Method and apparatus for controlling power of a transmitted signal |
| US20030058959A1 (en) | 2001-09-25 | 2003-03-27 | Caly Networks. | Combined digital adaptive pre-distorter and pre-equalizer system for modems in link hopping radio networks |
| US8446530B2 (en) | 2001-09-28 | 2013-05-21 | Entropic Communications, Inc. | Dynamic sampling |
| US7109998B2 (en) | 2001-10-03 | 2006-09-19 | Sun Microsystems, Inc. | Stationary semantic zooming |
| WO2003034674A1 (en) | 2001-10-10 | 2003-04-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Receiver with adaptive detection threshold for tdma communications |
| US7103329B1 (en) | 2001-10-25 | 2006-09-05 | Rockwell Collins, Inc. | Adaptive feedback channel for radio frequency power amplifiers |
| SE520466C2 (sv) * | 2001-11-12 | 2003-07-15 | Ericsson Telefon Ab L M | Metod och anordning vid en digital linjäriseringskoppling |
| US7058139B2 (en) | 2001-11-16 | 2006-06-06 | Koninklijke Philips Electronics N.V. | Transmitter with transmitter chain phase adjustment on the basis of pre-stored phase information |
| US6657510B2 (en) | 2001-11-27 | 2003-12-02 | Harris Corporation | Corrective phase quadrature modulator system and method |
| US8396368B2 (en) | 2009-12-09 | 2013-03-12 | Andrew Llc | Distributed antenna system for MIMO signals |
| JP2003168931A (ja) | 2001-12-04 | 2003-06-13 | Nec Corp | 歪補償回路 |
| US6703897B2 (en) | 2001-12-26 | 2004-03-09 | Nortel Networks Limited | Methods of optimising power amplifier efficiency and closed-loop power amplifier controllers |
| US7339891B2 (en) | 2002-01-09 | 2008-03-04 | Mverify Corporation | Method and system for evaluating wireless applications |
| US6993302B2 (en) | 2002-01-15 | 2006-01-31 | Igor Bausov | Class-L power-output amplifier |
| US7079818B2 (en) | 2002-02-12 | 2006-07-18 | Broadcom Corporation | Programmable mutlistage amplifier and radio applications thereof |
| JP3972664B2 (ja) | 2002-01-23 | 2007-09-05 | 日本電気株式会社 | パス障害回復方式及び障害復旧後の切戻方式並びにそれらを用いるノード |
| KR100553252B1 (ko) | 2002-02-01 | 2006-02-20 | 아바고테크놀로지스코리아 주식회사 | 휴대용 단말기의 전력 증폭 장치 |
| US7248642B1 (en) | 2002-02-05 | 2007-07-24 | Andrew Corporation | Frequency-dependent phase pre-distortion for reducing spurious emissions in communication networks |
| US6731168B2 (en) | 2002-02-06 | 2004-05-04 | Intersil Americas, Inc. | Power amplifier linearizer that compensates for long-time-constant memory effects and method therefor |
| US6566944B1 (en) | 2002-02-21 | 2003-05-20 | Ericsson Inc. | Current modulator with dynamic amplifier impedance compensation |
| US7339897B2 (en) | 2002-02-22 | 2008-03-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Cross-layer integrated collision free path routing |
| US6882833B2 (en) * | 2002-02-22 | 2005-04-19 | Blue7 Communications | Transferring data in a wireless communication system |
| US7197085B1 (en) | 2002-03-08 | 2007-03-27 | Andrew Corporation | Frequency-dependent magnitude pre-distortion for reducing spurious emissions in communication networks |
| US6983026B2 (en) | 2002-03-19 | 2006-01-03 | Motorola, Inc. | Method and apparatus using base band transformation to improve transmitter performance |
| US6747649B1 (en) | 2002-03-19 | 2004-06-08 | Aechelon Technology, Inc. | Terrain rendering in a three-dimensional environment |
| US7489632B2 (en) | 2002-03-22 | 2009-02-10 | Nokia Corporation | Simple admission control for IP based networks |
| US20030179830A1 (en) | 2002-03-25 | 2003-09-25 | Eidson Donald B. | Efficient, high fidelity transmission of modulation schemes through power-constrained remote relay stations by local transmit predistortion and local receiver feedback |
| DE60333421D1 (de) | 2002-03-26 | 2010-09-02 | Ca Minister Industry | Adaptiver vorverzerrer basierend auf der wahrscheie |
| JP4071526B2 (ja) | 2002-04-10 | 2008-04-02 | 松下電器産業株式会社 | 非線形歪補償装置および送信装置 |
| US8472897B1 (en) | 2006-12-22 | 2013-06-25 | Dali Systems Co. Ltd. | Power amplifier predistortion methods and apparatus |
| US6985704B2 (en) | 2002-05-01 | 2006-01-10 | Dali Yang | System and method for digital memorized predistortion for wireless communication |
| US8380143B2 (en) | 2002-05-01 | 2013-02-19 | Dali Systems Co. Ltd | Power amplifier time-delay invariant predistortion methods and apparatus |
| US8811917B2 (en) | 2002-05-01 | 2014-08-19 | Dali Systems Co. Ltd. | Digital hybrid mode power amplifier system |
| JP2003347854A (ja) | 2002-05-29 | 2003-12-05 | Matsushita Electric Ind Co Ltd | 電力増幅器 |
| JP4077449B2 (ja) | 2002-05-31 | 2008-04-16 | 富士通株式会社 | テーブル参照型プリディストータ |
| US6831901B2 (en) | 2002-05-31 | 2004-12-14 | Opencell Corporation | System and method for retransmission of data |
| KR100448892B1 (ko) | 2002-06-04 | 2004-09-18 | 한국전자통신연구원 | 고전력 증폭기의 비선형 왜곡 보상을 위한 전치 왜곡 장치및 그 방법 |
| JP2004015364A (ja) | 2002-06-06 | 2004-01-15 | Fujitsu Ltd | 歪補償機能を有する送信装置及び歪補償タイミング調整方法 |
| US7139327B2 (en) | 2002-06-10 | 2006-11-21 | Andrew Corporation | Digital pre-distortion of input signals for reducing spurious emissions in communication networks |
| US7493094B2 (en) | 2005-01-19 | 2009-02-17 | Micro Mobio Corporation | Multi-mode power amplifier module for wireless communication devices |
| US7034612B2 (en) | 2002-07-20 | 2006-04-25 | Lg Electronics Inc. | Apparatus and method for compensating pre-distortion of a power amplifier |
| KR100486547B1 (ko) | 2002-12-18 | 2005-05-03 | 엘지전자 주식회사 | 전력증폭기의 전치왜곡 보상장치 및 방법 |
| US7113551B2 (en) | 2002-07-25 | 2006-09-26 | Intersil Corporation | Transmitter with limited spectral regrowth and method therefor |
| US7321635B2 (en) | 2002-08-16 | 2008-01-22 | Andrew Corporation | Linearization of amplifiers using baseband detection and non-baseband pre-distortion |
| US7493129B1 (en) | 2002-09-12 | 2009-02-17 | At&T Mobility Ii Llc | Method and apparatus to maintain network coverage when using a transport media to communicate with a remote antenna |
| US20040053624A1 (en) | 2002-09-17 | 2004-03-18 | Frank Ed H. | Method and system for optimal load balancing in a hybrid wired/wireless network |
| JP4546711B2 (ja) | 2002-10-07 | 2010-09-15 | パナソニック株式会社 | 通信装置 |
| US7151913B2 (en) | 2003-06-30 | 2006-12-19 | M/A-Com, Inc. | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture |
| JP4124710B2 (ja) | 2002-10-17 | 2008-07-23 | 松下電器産業株式会社 | 無線通信システム |
| JP2004147009A (ja) | 2002-10-23 | 2004-05-20 | Hitachi Kokusai Electric Inc | 中継増幅装置 |
| JP4091047B2 (ja) * | 2002-10-31 | 2008-05-28 | 深▲川▼市中▲興▼通▲訊▼股▲分▼有限公司 | 広帯域プリディストーション線形化の方法およびシステム |
| US7047028B2 (en) | 2002-11-15 | 2006-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical fiber coupling configurations for a main-remote radio base station and a hybrid radio base station |
| US7206355B2 (en) | 2002-12-02 | 2007-04-17 | Nortel Networks Limited | Digitally convertible radio |
| US7103377B2 (en) | 2002-12-03 | 2006-09-05 | Adc Telecommunications, Inc. | Small signal threshold and proportional gain distributed digital communications |
| US8958789B2 (en) | 2002-12-03 | 2015-02-17 | Adc Telecommunications, Inc. | Distributed digital antenna system |
| US6785558B1 (en) | 2002-12-06 | 2004-08-31 | Lgc Wireless, Inc. | System and method for distributing wireless communication signals over metropolitan telecommunication networks |
| KR100480278B1 (ko) | 2002-12-24 | 2005-04-07 | 삼성전자주식회사 | 광대역 전력 증폭기를 위한 디지털 전치보상기 및 그적응화 방법 |
| AU2002354295A1 (en) | 2002-12-24 | 2004-07-22 | Pirelli And C. S.P.A. | Radio base station receiver having digital filtering and reduced sampling frequency |
| US7403573B2 (en) | 2003-01-15 | 2008-07-22 | Andrew Corporation | Uncorrelated adaptive predistorter |
| US20040142667A1 (en) | 2003-01-21 | 2004-07-22 | Lochhead Donald Laird | Method of correcting distortion in a power amplifier |
| US7295819B2 (en) | 2003-03-11 | 2007-11-13 | Andrew Corporation | Signal sample acquisition techniques |
| US7123890B2 (en) | 2003-03-11 | 2006-10-17 | Andrew Corporation | Signal sample acquisition techniques |
| US6975222B2 (en) | 2003-03-21 | 2005-12-13 | Baldev Krishan | Asset tracking apparatus and method |
| US6922102B2 (en) | 2003-03-28 | 2005-07-26 | Andrew Corporation | High efficiency amplifier |
| US7349490B2 (en) * | 2003-04-16 | 2008-03-25 | Powerwave Technologies, Inc. | Additive digital predistortion system employing parallel path coordinate conversion |
| US7038539B2 (en) | 2003-05-06 | 2006-05-02 | Powerwave Technologies, Inc. | RF amplifier employing active load linearization |
| US7251293B2 (en) | 2003-06-27 | 2007-07-31 | Andrew Corporation | Digital pre-distortion for the linearization of power amplifiers with asymmetrical characteristics |
| JP2005020675A (ja) | 2003-06-30 | 2005-01-20 | Maruko & Co Ltd | デジタル直交変換器 |
| US7302278B2 (en) | 2003-07-03 | 2007-11-27 | Rotani, Inc. | Method and apparatus for high throughput multiple radio sectorized wireless cell |
| US7068101B2 (en) | 2003-07-03 | 2006-06-27 | Icefyre Semiconductor Corporation | Adaptive predistortion for a transmit system |
| JP4356384B2 (ja) * | 2003-07-09 | 2009-11-04 | 日本電気株式会社 | 非線形補償回路と送信装置並びに非線形補償方法 |
| KR100546245B1 (ko) | 2003-07-10 | 2006-01-26 | 단암전자통신주식회사 | 프리디스토션을 이용한 전력 증폭 장치, 그 방법 및 그장치를 포함하는 무선 통신 시스템 |
| US7801038B2 (en) | 2003-07-14 | 2010-09-21 | Siemens Corporation | Method and apparatus for providing a delay guarantee for a wireless network |
| US7042287B2 (en) | 2003-07-23 | 2006-05-09 | Northrop Grumman Corporation | System and method for reducing dynamic range and improving linearity in an amplication system |
| US7259630B2 (en) | 2003-07-23 | 2007-08-21 | Andrew Corporation | Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter |
| CN100505588C (zh) | 2003-07-26 | 2009-06-24 | 华为技术有限公司 | 一种光纤传输系统、光纤传输的实现方法及终端处理装置 |
| US6963242B2 (en) | 2003-07-31 | 2005-11-08 | Andrew Corporation | Predistorter for phase modulated signals with low peak to average ratios |
| JP4093937B2 (ja) | 2003-08-21 | 2008-06-04 | 富士通株式会社 | 光伝送システム |
| US20050143091A1 (en) | 2003-09-02 | 2005-06-30 | Yair Shapira | Indoor location identification system |
| US7149482B2 (en) | 2003-09-16 | 2006-12-12 | Andrew Corporation | Compensation of filters in radio transmitters |
| US7109792B2 (en) | 2003-09-17 | 2006-09-19 | Andrew Corporation | Table-based pre-distortion for amplifier systems |
| JP4394409B2 (ja) * | 2003-09-25 | 2010-01-06 | 株式会社日立国際電気 | プリディストーション方式歪補償機能付き増幅器 |
| DE102004047724A1 (de) | 2003-09-30 | 2005-05-25 | Infineon Technologies Ag | Sendeeinrichtung mit adaptiver digitaler Vorverzerrung, Transceiver mit Sendeeinrichtung und Verfahren zum Betreiben einer Sendeeinrichtung |
| SE0302596D0 (sv) | 2003-09-30 | 2003-09-30 | Ericsson Telefon Ab L M | Improvments in or relating to base stations |
| US20100067906A1 (en) | 2003-10-02 | 2010-03-18 | Balluff Gmbh | Bandwidth allocation and management system for cellular networks |
| US7023273B2 (en) | 2003-10-06 | 2006-04-04 | Andrew Corporation | Architecture and implementation methods of digital predistortion circuitry |
| JP2005150932A (ja) | 2003-11-12 | 2005-06-09 | Hitachi Kokusai Electric Inc | プリディスト−ション装置 |
| KR20050052556A (ko) | 2003-11-28 | 2005-06-03 | 삼성전자주식회사 | 하이브리드 결합기를 이용한 다중 경로 전력 증폭기 |
| US7071777B2 (en) | 2003-12-02 | 2006-07-04 | Motorola, Inc. | Digital memory-based predistortion technique |
| KR101058733B1 (ko) | 2004-01-02 | 2011-08-22 | 삼성전자주식회사 | 전력 증폭기의 비선형 왜곡 특성을 보상하는 전치보상 장치 |
| EP1553791B1 (en) * | 2004-01-08 | 2007-06-13 | Evolium S.A.S. | Radio base station with multiple radio frequency heads |
| US20050157675A1 (en) | 2004-01-16 | 2005-07-21 | Feder Peretz M. | Method and apparatus for cellular communication over data networks |
| US7366252B2 (en) | 2004-01-21 | 2008-04-29 | Powerwave Technologies, Inc. | Wideband enhanced digital injection predistortion system and method |
| US8010073B2 (en) | 2004-01-22 | 2011-08-30 | Broadcom Corporation | System and method for adjusting power amplifier output power in linear dB steps |
| US7469491B2 (en) | 2004-01-27 | 2008-12-30 | Crestcom, Inc. | Transmitter predistortion circuit and method therefor |
| JP4255849B2 (ja) * | 2004-01-29 | 2009-04-15 | 株式会社エヌ・ティ・ティ・ドコモ | べき級数型ディジタルプリディストータ |
| JP4467319B2 (ja) | 2004-01-29 | 2010-05-26 | 株式会社日立国際電気 | プリディストータ |
| CN100341292C (zh) | 2004-02-02 | 2007-10-03 | 华为技术有限公司 | 一种分布式基站的组网方法 |
| US20080146168A1 (en) * | 2004-02-09 | 2008-06-19 | Sige Semiconductor Inc. | Methods of Enhancing Power Amplifier Linearity |
| EP1565017B1 (en) | 2004-02-11 | 2018-09-05 | Samsung Electronics Co., Ltd. | Method of operating tdd/virtual fdd hierarchical cellular telecommunication system |
| JP2005229268A (ja) | 2004-02-12 | 2005-08-25 | Renesas Technology Corp | 高周波電力増幅回路および無線通信システム |
| FI20040220A0 (fi) | 2004-02-12 | 2004-02-12 | Nokia Corp | Etäradio-osien tunnistaminen viestintäjärjestelmässä |
| US6998909B1 (en) * | 2004-02-17 | 2006-02-14 | Altera Corporation | Method to compensate for memory effect in lookup table based digital predistorters |
| EP1566979A1 (de) | 2004-02-23 | 2005-08-24 | Siemens Aktiengesellschaft | Mehrfache Verwendung einer standardisierten Schnittstelle in einer Vorrichtung |
| US7577211B2 (en) | 2004-03-01 | 2009-08-18 | Powerwave Technologies, Inc. | Digital predistortion system and method for linearizing an RF power amplifier with nonlinear gain characteristics and memory effects |
| US7336725B2 (en) | 2004-03-03 | 2008-02-26 | Powerwave Technologies, Inc. | Digital predistortion system and method for high efficiency transmitters |
| US7312750B2 (en) | 2004-03-19 | 2007-12-25 | Comware, Inc. | Adaptive beam-forming system using hierarchical weight banks for antenna array in wireless communication system |
| JP4448955B2 (ja) | 2004-03-29 | 2010-04-14 | ユーティーシダカントンシュンユーシァンゴンシ | マルチモード無線ネットワークにおけるリソース管理方法およびトラフィック誘導方法 |
| JP4520204B2 (ja) | 2004-04-14 | 2010-08-04 | 三菱電機株式会社 | 高周波電力増幅器 |
| WO2005104576A1 (fr) | 2004-04-22 | 2005-11-03 | Utstarcom Telecom Co., Ltd. | Systeme sans fil distribue destine a la commande centrale d'une ressource |
| CN1926896B (zh) | 2004-04-23 | 2010-05-26 | Ut斯达康通讯有限公司 | 射频拉远无线基站中多天线信号传输方法和系统 |
| US7102442B2 (en) | 2004-04-28 | 2006-09-05 | Sony Ericsson Mobile Communications Ab | Wireless terminals, methods and computer program products with transmit power amplifier input power regulation |
| KR101126401B1 (ko) | 2004-05-11 | 2012-03-29 | 삼성전자주식회사 | 전력 증폭기에 디지털 전치 왜곡 장치 및 방법 |
| JP4417174B2 (ja) * | 2004-05-19 | 2010-02-17 | 株式会社日立国際電気 | プリディストータ |
| US7676804B2 (en) | 2004-05-20 | 2010-03-09 | Caterpillar Inc. | Systems and method for remotely modifying software on a work machine |
| EP1750376B1 (en) | 2004-06-14 | 2015-10-21 | Panasonic Intellectual Property Management Co., Ltd. | Radio communication device |
| US7773578B2 (en) | 2004-07-13 | 2010-08-10 | Utstarcom Telecom Co., Ltd. | Packet transmission method for wireless signals in a wireless base station system |
| CN100544459C (zh) | 2004-07-13 | 2009-09-23 | Ut斯达康通讯有限公司 | 远程射频单元与集中式基站的接口方法 |
| US7151405B2 (en) | 2004-07-14 | 2006-12-19 | Raytheon Company | Estimating power amplifier non-linearity in accordance with memory depth |
| US7113037B2 (en) | 2004-07-14 | 2006-09-26 | Raytheon Company | Performing remote power amplifier linearization |
| EP1786128A1 (en) | 2004-08-30 | 2007-05-16 | Matsushita Electric Industrial Co., Ltd. | Peak power suppressing apparatus and peak power suppressing method |
| JP4214098B2 (ja) | 2004-09-09 | 2009-01-28 | 株式会社ルネサステクノロジ | シグマデルタ送信回路及びそれを用いた送受信機 |
| US7463697B2 (en) | 2004-09-28 | 2008-12-09 | Intel Corporation | Multicarrier transmitter and methods for generating multicarrier communication signals with power amplifier predistortion and linearization |
| WO2006040653A1 (en) | 2004-10-12 | 2006-04-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Communication between a radio equipment control node and multiple remote radio equipment nodes |
| US8855489B2 (en) * | 2004-10-25 | 2014-10-07 | Telecom Italia S.P.A. | Communications method, particularly for a mobile radio network |
| US7362776B2 (en) | 2004-11-01 | 2008-04-22 | Cisco Technology, Inc. | Method for multicast load balancing in wireless LANs |
| US7313415B2 (en) | 2004-11-01 | 2007-12-25 | Nextg Networks, Inc. | Communications system and method |
| CN1774094A (zh) | 2004-11-08 | 2006-05-17 | 华为技术有限公司 | 一种无线基站系统及其发射和接收信息的方法 |
| US8527003B2 (en) | 2004-11-10 | 2013-09-03 | Newlans, Inc. | System and apparatus for high data rate wireless communications |
| US7433668B2 (en) | 2004-12-23 | 2008-10-07 | Lucent Technologies Inc. | Controlling Q-factor of filters |
| US7104310B2 (en) | 2004-12-27 | 2006-09-12 | Hunter Automated Machinery Corporation | Mold making machine with separated safety work zones |
| CN100426897C (zh) | 2005-01-12 | 2008-10-15 | 华为技术有限公司 | 分体式基站系统及其组网方法和基带单元 |
| US7787854B2 (en) | 2005-02-01 | 2010-08-31 | Adc Telecommunications, Inc. | Scalable distributed radio network |
| US7511574B2 (en) | 2005-02-17 | 2009-03-31 | Hitachi Kokusai Electric Inc. | Predistorter |
| JP4683468B2 (ja) | 2005-03-22 | 2011-05-18 | ルネサスエレクトロニクス株式会社 | 高周波電力増幅回路 |
| US7193462B2 (en) | 2005-03-22 | 2007-03-20 | Powerwave Technologies, Inc. | RF power amplifier system employing an analog predistortion module using zero crossings |
| DE102005013881A1 (de) | 2005-03-24 | 2006-09-28 | Infineon Technologies Ag | Verfahren zur Signalverarbeitung und Sendeeinrichtung mit digitaler Vorverzerrung, insbesondere für den Mobilfunk |
| US20090252139A1 (en) | 2005-03-31 | 2009-10-08 | Telecom Italia S.P.A. | Radio-Access Method for Mobile-Radio Networks, Related Networks and Computer Program Product |
| US7398106B2 (en) | 2005-03-31 | 2008-07-08 | Adc Telecommunications, Inc. | Dynamic readjustment of power |
| US7423988B2 (en) | 2005-03-31 | 2008-09-09 | Adc Telecommunications, Inc. | Dynamic reconfiguration of resources through page headers |
| US7640019B2 (en) | 2005-03-31 | 2009-12-29 | Adc Telecommunications, Inc. | Dynamic reallocation of bandwidth and modulation protocols |
| BRPI0520163B1 (pt) | 2005-03-31 | 2018-11-27 | Telecom Italia Spa | método para controlar a operação de pelo menos uma estação rádio base em uma rede de rádio móvel, estação rádio base para uma rede de rádio móvel, e, sistema que compreende a respectiva estação rádio base |
| US7474891B2 (en) | 2005-03-31 | 2009-01-06 | Adc Telecommunications, Inc. | Dynamic digital up and down converters |
| US7688792B2 (en) | 2005-04-21 | 2010-03-30 | Qualcomm Incorporated | Method and apparatus for supporting wireless data services on a TE2 device using an IP-based interface |
| CN100576724C (zh) | 2005-05-18 | 2009-12-30 | 株式会社Ntt都科摩 | 幂级数型前置补偿器及其控制方法 |
| US7499682B2 (en) | 2005-05-24 | 2009-03-03 | Skyworks Solutions, Inc. | Dual voltage regulator for a supply voltage controlled power amplifier in a closed power control loop |
| US7603141B2 (en) | 2005-06-02 | 2009-10-13 | Qualcomm, Inc. | Multi-antenna station with distributed antennas |
| JP2006340166A (ja) | 2005-06-03 | 2006-12-14 | Nippon Dengyo Kosaku Co Ltd | 歪補償増幅器 |
| EP1732208B1 (en) | 2005-06-06 | 2008-03-05 | NTT DoCoMo INC. | Power series type predistorter for multi-frequency bands operation |
| US8112094B1 (en) | 2005-06-09 | 2012-02-07 | At&T Mobility Ii Llc | Radio access layer management |
| US20070008939A1 (en) | 2005-06-10 | 2007-01-11 | Adc Telecommunications, Inc. | Providing wireless coverage into substantially closed environments |
| JP4410158B2 (ja) | 2005-06-24 | 2010-02-03 | 株式会社東芝 | 通信システム及びそれに用いられる親機中継装置 |
| EP1739894B1 (en) | 2005-06-30 | 2007-08-29 | NTT DoCoMo, Inc. | Apparatus and method for improved handover in MESH networks |
| WO2007004252A1 (ja) | 2005-06-30 | 2007-01-11 | Fujitsu Limited | 歪補償回路を有する電力増幅器 |
| GB0513583D0 (en) | 2005-07-01 | 2005-08-10 | Nokia Corp | A mobile communications network with multiple radio units |
| CN1905729A (zh) | 2005-07-29 | 2007-01-31 | 西门子（中国）有限公司 | 分布式天线系统中的无线通信资源配置方法 |
| US20070058742A1 (en) | 2005-09-09 | 2007-03-15 | Demarco Anthony | Distributed antenna system using signal precursors |
| US20070057737A1 (en) * | 2005-09-14 | 2007-03-15 | Freescale Semiconductor, Inc. | Compensation for modulation distortion |
| JP4634902B2 (ja) | 2005-09-30 | 2011-02-16 | 日本放送協会 | 送信装置及びプログラム |
| US7616610B2 (en) | 2005-10-04 | 2009-11-10 | Motorola, Inc. | Scheduling in wireless communication systems |
| US7286507B1 (en) | 2005-10-04 | 2007-10-23 | Sprint Spectrum L.P. | Method and system for dynamically routing between a radio access network and distributed antenna system remote antenna units |
| US20070075780A1 (en) | 2005-10-05 | 2007-04-05 | Enver Krvavac | Apparatus and method for adaptive biasing of a Doherty amplifier |
| CN1960231A (zh) | 2005-10-31 | 2007-05-09 | Ut斯达康通讯有限公司 | Cpri链路多路复用传输方法及系统 |
| US7301402B2 (en) | 2005-11-17 | 2007-11-27 | Freescale Semiconductor, Inc. | Soft saturation detection for power amplifiers |
| US7496367B1 (en) | 2005-11-22 | 2009-02-24 | Nortel Networks Limited | Method of multi-carrier traffic allocation for wireless communication system |
| US7831221B2 (en) | 2005-12-13 | 2010-11-09 | Andrew Llc | Predistortion system and amplifier for addressing group delay modulation |
| US20070274279A1 (en) | 2005-12-19 | 2007-11-29 | Wood Steven A | Distributed antenna system employing digital forward deployment of wireless transmit/receive locations |
| KR20070069731A (ko) | 2005-12-28 | 2007-07-03 | 삼성전자주식회사 | 광대역 무선 통신 시스템의 기지국에서 디지털 장치와 원격알에프 장치간의 통신 장치 및 방법 |
| US7813451B2 (en) | 2006-01-11 | 2010-10-12 | Mobileaccess Networks Ltd. | Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting |
| JP2007195056A (ja) | 2006-01-20 | 2007-08-02 | Matsushita Electric Ind Co Ltd | 歪み補償装置及び歪み補償方法 |
| US7626591B2 (en) | 2006-01-24 | 2009-12-01 | D & S Consultants, Inc. | System and method for asynchronous continuous-level-of-detail texture mapping for large-scale terrain rendering |
| US8195103B2 (en) | 2006-02-15 | 2012-06-05 | Texas Instruments Incorporated | Linearization of a transmit amplifier |
| JP2007235738A (ja) | 2006-03-02 | 2007-09-13 | Sumitomo Electric Ind Ltd | 通信システム |
| US20070223614A1 (en) | 2006-03-23 | 2007-09-27 | Ravi Kuchibhotla | Common time frequency radio resource in wireless communication systems |
| US7610046B2 (en) | 2006-04-06 | 2009-10-27 | Adc Telecommunications, Inc. | System and method for enhancing the performance of wideband digital RF transport systems |
| US7599711B2 (en) | 2006-04-12 | 2009-10-06 | Adc Telecommunications, Inc. | Systems and methods for analog transport of RF voice/data communications |
| GB2437586A (en) | 2006-04-27 | 2007-10-31 | Motorola Inc | High speed downlink packet access communication in a cellular communication system |
| CN101479956B (zh) | 2006-04-28 | 2013-07-31 | 大力系统有限公司 | 用于无线通信的高效率线性化功率放大器 |
| WO2008105775A1 (en) | 2006-04-28 | 2008-09-04 | Dali Systems Co. Ltd | High efficiency linearization power amplifier for wireless communication |
| US7826810B2 (en) | 2006-05-08 | 2010-11-02 | Harris Corporation | Multiband radio with transmitter output power optimization |
| US20070264947A1 (en) | 2006-05-10 | 2007-11-15 | Dmitriy Rozenblit | System and method for saturation detection and compensation in a polar transmitter |
| JP4839133B2 (ja) | 2006-05-22 | 2011-12-21 | 株式会社日立製作所 | ストレージ装置のデータ管理方法及び計算機システム |
| US7733978B2 (en) | 2006-05-26 | 2010-06-08 | Industrial Technology Research Institute | Apparatus and method of dynamically adapting the LUT spacing for linearizing a power amplifier |
| JP4981494B2 (ja) | 2006-05-30 | 2012-07-18 | 株式会社日立国際電気 | 無線通信システム及び張り出し局装置 |
| US8477614B2 (en) | 2006-06-30 | 2013-07-02 | Centurylink Intellectual Property Llc | System and method for routing calls if potential call paths are impaired or congested |
| US20080045254A1 (en) | 2006-08-15 | 2008-02-21 | Motorola, Inc. | Method and Apparatus for Maximizing Resource Utilization of Base Stations in a Communication Network |
| US8064391B2 (en) | 2006-08-22 | 2011-11-22 | Embarq Holdings Company, Llc | System and method for monitoring and optimizing network performance to a wireless device |
| US7848770B2 (en) | 2006-08-29 | 2010-12-07 | Lgc Wireless, Inc. | Distributed antenna communications system and methods of implementing thereof |
| JP2008078702A (ja) | 2006-09-19 | 2008-04-03 | Fujitsu Ltd | 増幅器故障検出装置 |
| JP5312734B2 (ja) | 2006-09-20 | 2013-10-09 | 富士通株式会社 | 移動通信端末 |
| EP2067289B1 (en) | 2006-09-22 | 2016-09-07 | Alvarion Ltd. | Wireless over pon |
| ES2828720T3 (es) | 2006-09-27 | 2021-05-27 | Telecom Italia Spa | Aparato y procedimiento para implementar políticas de gestión de recursos configurables |
| US7778307B2 (en) | 2006-10-04 | 2010-08-17 | Motorola, Inc. | Allocation of control channel for radio resource assignment in wireless communication systems |
| JP4791320B2 (ja) | 2006-10-13 | 2011-10-12 | 富士通株式会社 | コモン・パブリック・ラジオ・インタフェース（ｃｐｒｉ）のベンダー特有領域を使った回線迂回方式 |
| US7583677B1 (en) | 2006-11-03 | 2009-09-01 | Juniper Networks, Inc. | Dynamic flow-based multi-path load balancing with quality of service assurances |
| EP1924109B1 (en) | 2006-11-20 | 2013-11-06 | Alcatel Lucent | Method and system for wireless cellular indoor communications |
| JP2008135955A (ja) | 2006-11-28 | 2008-06-12 | Toshiba Corp | Ｒｏｆシステムおよび子局装置設置方法 |
| FI20065783A0 (sv) | 2006-12-08 | 2006-12-08 | Nokia Corp | Signalfördistorsion i radiosändare |
| WO2008078195A2 (en) | 2006-12-26 | 2008-07-03 | Dali Systems Co., Ltd. | Method and system for baseband predistortion linearization in multi-channel wideband communication systems |
| US9026067B2 (en) | 2007-04-23 | 2015-05-05 | Dali Systems Co. Ltd. | Remotely reconfigurable power amplifier system and method |
| US8374271B2 (en) | 2007-01-08 | 2013-02-12 | Cisco Technology, Inc. | Method and system for resizing a MIMO channel |
| US20080181182A1 (en) | 2007-01-12 | 2008-07-31 | Scott Carichner | Digital radio head system and method |
| US8737454B2 (en) | 2007-01-25 | 2014-05-27 | Adc Telecommunications, Inc. | Modular wireless communications platform |
| US8583100B2 (en) | 2007-01-25 | 2013-11-12 | Adc Telecommunications, Inc. | Distributed remote base station system |
| EP2118999A4 (en) | 2007-01-26 | 2010-01-27 | Dali Systems Co Ltd | TIME INVARIENT FORECASTING METHOD AND DEVICE FOR POWER AMPLIFIERS |
| US20090013317A1 (en) | 2007-02-08 | 2009-01-08 | Airnet Communications Corporation | Software Management for Software Defined Radio in a Distributed Network |
| WO2008099383A2 (en) | 2007-02-12 | 2008-08-21 | Mobileaccess Networks Ltd. | Mimo-adapted distributed antenna system |
| US20080240286A1 (en) | 2007-03-26 | 2008-10-02 | Innofidei, Inc. | Signal transmission system, method and apparatus |
| US8274332B2 (en) | 2007-04-23 | 2012-09-25 | Dali Systems Co. Ltd. | N-way Doherty distributed power amplifier with power tracking |
| JP5591106B2 (ja) | 2007-04-23 | 2014-09-17 | ダリ システムズ カンパニー リミテッド | デジタルハイブリッドモード電力増幅器システム |
| JP5040998B2 (ja) | 2007-05-31 | 2012-10-03 | 富士通株式会社 | 無線基地局装置および無線基地局装置内のリンク断救済方法 |
| WO2008155764A2 (en) | 2007-06-18 | 2008-12-24 | Duolink Ltd. | Wireless network architecture and method for base station utilization |
| US8010116B2 (en) | 2007-06-26 | 2011-08-30 | Lgc Wireless, Inc. | Distributed antenna communications system |
| US8964532B2 (en) | 2007-06-29 | 2015-02-24 | Alcatel Lucent | Wireless communication device including a standby radio |
| US7702300B1 (en) | 2007-07-12 | 2010-04-20 | Panasonic Corporation | Envelope modulator saturation detection using a DC-DC converter |
| US20090019664A1 (en) | 2007-07-20 | 2009-01-22 | Kwin Abram | Square bushing for exhaust valve |
| US8369809B2 (en) | 2007-07-27 | 2013-02-05 | Netlogic Microsystems, Inc. | Crest factor reduction |
| JP2009038688A (ja) | 2007-08-03 | 2009-02-19 | Furuno Electric Co Ltd | 無線装置 |
| US8290088B2 (en) * | 2007-08-07 | 2012-10-16 | Research In Motion Limited | Detecting the number of transmit antennas in a base station |
| WO2009023302A2 (en) | 2007-08-14 | 2009-02-19 | Rambus Inc. | Communication using continuous-phase modulated signals |
| US7948897B2 (en) | 2007-08-15 | 2011-05-24 | Adc Telecommunications, Inc. | Delay management for distributed communications networks |
| US20090060496A1 (en) | 2007-08-31 | 2009-03-05 | Liu David H | Method and system for enabling diagnosing of faults in a passive optical network |
| US8010099B2 (en) | 2007-09-04 | 2011-08-30 | Alcatel Lucent | Methods of reconfiguring sector coverage in in-building communications system |
| CN101394647B (zh) | 2007-09-21 | 2013-10-02 | 电信科学技术研究院 | 一种实现小区组网的方法及系统 |
| US8103267B2 (en) | 2007-09-26 | 2012-01-24 | Via Telecom, Inc. | Femtocell base station with mobile station capability |
| FI20075690A0 (fi) | 2007-10-01 | 2007-10-01 | Nokia Corp | Signaalin esivääristäminen radiolähettimessä |
| EP2179506B1 (en) | 2007-10-01 | 2011-01-26 | ST Wireless SA | Correlation-driven adaptation of frequency control for a rf receiver device |
| US8478331B1 (en) | 2007-10-23 | 2013-07-02 | Clearwire Ip Holdings Llc | Method and system for transmitting streaming media content to wireless subscriber stations |
| JP5252881B2 (ja) * | 2007-11-02 | 2013-07-31 | 株式会社エヌ・ティ・ティ・ドコモ | 移動通信システムで使用される基地局及び方法 |
| WO2009067072A1 (en) | 2007-11-21 | 2009-05-28 | Telefonaktiebolaget L M Ericsson (Publ) | A method and a radio base station in a telecommunications system |
| CN201127027Y (zh) | 2007-11-30 | 2008-10-01 | 京信通信系统（中国）有限公司 | 多载波数字选频射频拉远系统 |
| CN101453799B (zh) | 2007-11-30 | 2010-05-19 | 京信通信系统（中国）有限公司 | 多载波数字选频射频拉远系统及其信号处理方法 |
| US7598907B2 (en) | 2007-12-06 | 2009-10-06 | Kyocera Corporation | System and method for WWAN/WLAN position estimation |
| EP2248255A4 (en) | 2007-12-07 | 2014-05-28 | Dali Systems Co Ltd | DIGITAL PREDISTORSION RF DERIVED BASEBAND |
| CN101459913B (zh) | 2007-12-12 | 2010-10-27 | 华为技术有限公司 | 无线通信系统、中心站、接入设备及通信方法 |
| JP5017072B2 (ja) | 2007-12-13 | 2012-09-05 | キヤノン株式会社 | 画像処理装置、その制御方法及びプログラム |
| WO2009081376A2 (en) | 2007-12-20 | 2009-07-02 | Mobileaccess Networks Ltd. | Extending outdoor location based services and applications into enclosed areas |
| US8165100B2 (en) | 2007-12-21 | 2012-04-24 | Powerwave Technologies, Inc. | Time division duplexed digital distributed antenna system |
| US8855036B2 (en) | 2007-12-21 | 2014-10-07 | Powerwave Technologies S.A.R.L. | Digital distributed antenna system |
| US9385804B2 (en) | 2008-01-15 | 2016-07-05 | Intel Deutschland Gmbh | Transmission unit and a method for transmitting data |
| GB0800767D0 (en) | 2008-01-16 | 2008-02-27 | Nec Corp | A method for controlling access to a mobile communications network |
| US8666428B2 (en) | 2008-01-29 | 2014-03-04 | Alcatel Lucent | Method to support user location in in-structure coverage systems |
| CN101953223B (zh) | 2008-02-08 | 2014-10-29 | Adc长途电讯有限公司 | 用于使用许可的射频频谱和会话发起协议提供蜂窝无线服务的企业移动网络 |
| KR20090088083A (ko) | 2008-02-14 | 2009-08-19 | 삼성전자주식회사 | 분산 안테나 시스템에서 사용자 선택을 위한 장치 및 방법 |
| FI20085158A0 (fi) | 2008-02-21 | 2008-02-21 | Nokia Corp | Laite ja menetelmä |
| CN101521893B (zh) | 2008-02-25 | 2010-12-01 | 京信通信系统（中国）有限公司 | 宽带数字选频射频拉远系统及其信号处理方法 |
| US8204544B2 (en) | 2008-03-27 | 2012-06-19 | Rockstar Bidco, LP | Agile remote radio head |
| US8428077B2 (en) | 2008-03-31 | 2013-04-23 | Qualcomm Incorporated | Methods and apparatus for dynamic load balancing with E-AICH |
| US9049687B2 (en) | 2008-05-05 | 2015-06-02 | Industrial Technology Research Institute | System and method for providing multicast and/or broadcast services |
| US20090286484A1 (en) | 2008-05-19 | 2009-11-19 | Lgc Wireless, Inc. | Method and system for performing onsite maintenance of wireless communication systems |
| US8005152B2 (en) | 2008-05-21 | 2011-08-23 | Samplify Systems, Inc. | Compression of baseband signals in base transceiver systems |
| JP5090258B2 (ja) | 2008-06-05 | 2012-12-05 | 日本電信電話株式会社 | 無線アクセスシステムおよび端末局装置ならびに無線アクセス方法 |
| TWI372531B (en) | 2008-06-10 | 2012-09-11 | Ind Tech Res Inst | Wireless network, access point, and load balancing method thereof |
| US8208414B2 (en) | 2008-06-24 | 2012-06-26 | Lgc Wireless, Inc. | System and method for configurable time-division duplex interface |
| KR101511786B1 (ko) * | 2008-06-30 | 2015-04-14 | 엘지전자 주식회사 | 주파수 분할 이중 중계국을 포함하는 무선통신 시스템 및 이 무선통신 시스템에서의 무선자원의 이용 방법 |
| EP2294860B1 (en) * | 2008-07-03 | 2017-04-19 | Telefonaktiebolaget LM Ericsson (publ) | A method and apparatus for supporting fast carrier reselection |
| CN101621806B (zh) | 2008-07-04 | 2011-09-21 | 京信通信系统（中国）有限公司 | 应用于gsm网络的智能化载波调度方法 |
| KR100969741B1 (ko) | 2008-07-11 | 2010-07-13 | 엘지노텔 주식회사 | 환형 혼성 성형망을 제공하기 위한 광통신 시스템 |
| US7855977B2 (en) | 2008-08-01 | 2010-12-21 | At&T Mobility Ii Llc | Alarming in a femto cell network |
| CN201307942Y (zh) | 2008-09-17 | 2009-09-09 | 京信通信系统（中国）有限公司 | 射频拉远系统实现覆盖的无线区域中心 |
| US8229416B2 (en) | 2008-09-23 | 2012-07-24 | Ixia | Methods, systems, and computer readable media for stress testing mobile network equipment using a common public radio interface (CPRI) |
| US20100087227A1 (en) | 2008-10-02 | 2010-04-08 | Alvarion Ltd. | Wireless base station design |
| US8565193B2 (en) | 2008-10-16 | 2013-10-22 | Elektrobit Wireless Communications Oy | Beam forming method, apparatus and system |
| US9826409B2 (en) | 2008-10-24 | 2017-11-21 | Qualcomm Incorporated | Adaptive semi-static interference avoidance in cellular networks |
| KR101481421B1 (ko) | 2008-11-03 | 2015-01-21 | 삼성전자주식회사 | 이동 통신 시스템에서 단말의 화이트 리스트 관리 방법 및 장치 |
| US8385483B2 (en) | 2008-11-11 | 2013-02-26 | Isco International, Llc | Self-adaptive digital RF bandpass and bandstop filter architecture |
| TW201021473A (en) | 2008-11-21 | 2010-06-01 | Inventec Appliances Corp | A master-slave system for mobile communications and a domain login method therefor |
| US20100128676A1 (en) | 2008-11-24 | 2010-05-27 | Dong Wu | Carrier Channel Distribution System |
| CN101754229B (zh) | 2008-11-28 | 2012-10-24 | 京信通信系统（中国）有限公司 | 载波信道动态调度的通信覆盖系统 |
| CN101754431B (zh) | 2008-12-01 | 2012-07-04 | 中国移动通信集团天津有限公司 | 无线专用网络系统、设备及信号传输和切换方法 |
| CN101453699B (zh) | 2008-12-30 | 2012-04-25 | 华为技术有限公司 | 一种广告播放方法和用户终端 |
| WO2010083182A2 (en) | 2009-01-13 | 2010-07-22 | Adc Telecommunications, Inc. | Systems and methods for improved digital rf transport in distributed antenna systems |
| US8213401B2 (en) | 2009-01-13 | 2012-07-03 | Adc Telecommunications, Inc. | Systems and methods for IP communication over a distributed antenna system transport |
| US8346278B2 (en) | 2009-01-13 | 2013-01-01 | Adc Telecommunications, Inc. | Systems and methods for mobile phone location with digital distributed antenna systems |
| JP5216604B2 (ja) | 2009-01-19 | 2013-06-19 | 株式会社日立国際電気 | 無線装置 |
| US8467355B2 (en) | 2009-01-22 | 2013-06-18 | Belair Networks Inc. | System and method for providing wireless local area networks as a service |
| KR101562518B1 (ko) | 2009-01-22 | 2015-10-23 | 삼성전자주식회사 | 통신 시스템 및 그의 펨토 기지국 연결 변경 방법 |
| EP2393317A1 (en) | 2009-01-30 | 2011-12-07 | Hitachi, Ltd. | Wireless communication system and communication control method |
| US8098572B2 (en) | 2009-02-03 | 2012-01-17 | Google Inc. | Interface monitoring for link aggregation |
| US20130153298A1 (en) | 2009-02-19 | 2013-06-20 | Interdigital Patent Holdings, Inc. | Method and apparatus for enhancing cell-edge user performance and signaling radio link failure conditions via downlink cooperative component carriers |
| US7826369B2 (en) | 2009-02-20 | 2010-11-02 | Cisco Technology, Inc. | Subsets of the forward information base (FIB) distributed among line cards in a switching device |
| KR101770822B1 (ko) | 2009-02-22 | 2017-08-24 | 엘지전자 주식회사 | 무선 통신 시스템에서 인터 워킹 신호 전송 방법 및 장치 |
| PL2228920T3 (pl) | 2009-03-12 | 2013-10-31 | Alcatel Lucent | Synchronizacja anten na potrzeby spójnej sieci MIMO |
| US8472965B2 (en) * | 2009-03-17 | 2013-06-25 | Qualcomm Incorporated | Mobility in multi-carrier high speed packet access |
| US8606321B2 (en) | 2009-04-09 | 2013-12-10 | Alcatel Lucent | High-selectivity low noise receiver front end |
| US8422885B2 (en) | 2009-04-16 | 2013-04-16 | Trex Enterprises Corp | Bandwidth allocation and management system for cellular networks |
| US9154352B2 (en) | 2009-04-21 | 2015-10-06 | Qualcomm Incorporated | Pre-communication for relay base stations in wireless communication |
| US9432991B2 (en) | 2009-04-21 | 2016-08-30 | Qualcomm Incorporated | Enabling support for transparent relays in wireless communication |
| US8849190B2 (en) | 2009-04-21 | 2014-09-30 | Andrew Llc | Radio communication systems with integrated location-based measurements for diagnostics and performance optimization |
| US8289910B2 (en) | 2009-04-24 | 2012-10-16 | Kathrein-Werke Kg | Device for receiving and transmitting mobile telephony signals with multiple transmit-receive branches |
| EP2430531B1 (en) | 2009-04-24 | 2019-12-04 | Dali Systems Co. Ltd. | Remotely reconfigurable power amplifier system and method |
| US8346091B2 (en) | 2009-04-29 | 2013-01-01 | Andrew Llc | Distributed antenna system for wireless network systems |
| ITMO20090135A1 (it) | 2009-05-19 | 2010-11-20 | Teko Telecom S P A | Sistema e metodo per la distribuzione di segnali a radiofrequenza |
| US8812347B2 (en) | 2009-05-21 | 2014-08-19 | At&T Mobility Ii Llc | Aggregating and capturing subscriber traffic |
| EP3595393B1 (en) | 2009-05-22 | 2022-10-26 | Huawei Technologies Co., Ltd. | Multi-slot scheduling methods, apparatuses and non-transitory computer-readable media |
| US8588614B2 (en) | 2009-05-22 | 2013-11-19 | Extenet Systems, Inc. | Flexible distributed antenna system |
| US20100304773A1 (en) | 2009-05-27 | 2010-12-02 | Ramprashad Sean A | Method for selective antenna activation and per antenna or antenna group power assignments in cooperative signaling wireless mimo systems |
| US8139492B1 (en) | 2009-06-09 | 2012-03-20 | Juniper Networks, Inc. | Local forwarding bias in a multi-chassis router |
| US8811925B2 (en) | 2009-06-10 | 2014-08-19 | Clearwire Ip Holdings Llc | System and method for providing external receiver gain compensation when using an antenna with a pre-amplifier |
| US8634313B2 (en) * | 2009-06-19 | 2014-01-21 | Qualcomm Incorporated | Method and apparatus that facilitates a timing alignment in a multicarrier system |
| CN101931454B (zh) | 2009-06-19 | 2013-06-05 | 大唐移动通信设备有限公司 | 基于以太网的射频拉远数据传输 |
| TWI372882B (en) | 2009-06-23 | 2012-09-21 | Univ Nat Chiao Tung | The gps tracking system |
| US20110069657A1 (en) | 2009-09-09 | 2011-03-24 | Qualcomm Incorporated | System and method for the simultaneous transmission and reception of flo and flo-ev data over a multi-frequency network |
| US8451735B2 (en) | 2009-09-28 | 2013-05-28 | Symbol Technologies, Inc. | Systems and methods for dynamic load balancing in a wireless network |
| CN102044736B (zh) | 2009-10-14 | 2015-05-20 | 中兴通讯股份有限公司 | 射频拉远单元 |
| WO2011053827A1 (en) | 2009-10-30 | 2011-05-05 | Interdigital Patent Holdings, Inc. | Method and apparatus for concurrently processing multiple radio carriers |
| KR101815329B1 (ko) | 2009-12-21 | 2018-01-05 | 달리 시스템즈 씨오. 엘티디. | 변조 방식에 무관한 디지털 하이브리드 모드 전력 증폭기 시스템 및 그 방법 |
| US8351877B2 (en) | 2010-12-21 | 2013-01-08 | Dali Systems Co. Ltfd. | Multi-band wideband power amplifier digital predistorition system and method |
| US8542768B2 (en) | 2009-12-21 | 2013-09-24 | Dali Systems Co. Ltd. | High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications |
| US8320866B2 (en) | 2010-02-11 | 2012-11-27 | Mediatek Singapore Pte. Ltd. | Integrated circuits, communication units and methods of cancellation of intermodulation distortion |
| US20110223958A1 (en) | 2010-03-10 | 2011-09-15 | Fujitsu Limited | System and Method for Implementing Power Distribution |
| US8467823B2 (en) | 2010-03-24 | 2013-06-18 | Fujitsu Limited | Method and system for CPRI cascading in distributed radio head architectures |
| US8681917B2 (en) | 2010-03-31 | 2014-03-25 | Andrew Llc | Synchronous transfer of streaming data in a distributed antenna system |
| US8935543B2 (en) | 2010-04-02 | 2015-01-13 | Andrew Llc | Method and apparatus for distributing power over communication cabling |
| US8559485B2 (en) | 2010-04-08 | 2013-10-15 | Andrew Llc | Autoregressive signal processing for repeater echo cancellation |
| US8346160B2 (en) | 2010-05-12 | 2013-01-01 | Andrew Llc | System and method for detecting and measuring uplink traffic in signal repeating systems |
| US9125068B2 (en) | 2010-06-04 | 2015-09-01 | Ixia | Methods, systems, and computer readable media for simulating realistic movement of user equipment in a long term evolution (LTE) network |
| US20110302390A1 (en) | 2010-06-05 | 2011-12-08 | Greg Copeland | SYSTEMS AND METHODS FOR PROCESSING COMMUNICATIONS SIGNALS fUSING PARALLEL PROCESSING |
| EP2580936B1 (en) | 2010-06-09 | 2018-11-28 | CommScope Technologies LLC | Uplink noise minimization |
| US20110310881A1 (en) | 2010-06-17 | 2011-12-22 | Peter Kenington | Remote radio head |
| US8774109B2 (en) | 2010-06-17 | 2014-07-08 | Kathrein-Werke Kg | Mobile communications network with distributed processing resources |
| US8630211B2 (en) | 2010-06-30 | 2014-01-14 | Qualcomm Incorporated | Hybrid radio architecture for repeaters using RF cancellation reference |
| US20140126914A1 (en) | 2010-07-09 | 2014-05-08 | Corning Cable Systems Llc | Optical fiber-based distributed radio frequency (rf) antenna systems supporting multiple-input, multiple-output (mimo) configurations, and related components and methods |
| US8570914B2 (en) | 2010-08-09 | 2013-10-29 | Corning Cable Systems Llc | Apparatuses, systems, and methods for determining location of a mobile device(s) in a distributed antenna system(s) |
| US8848766B2 (en) | 2010-08-17 | 2014-09-30 | Dali Systems Co. Ltd. | Neutral host architecture for a distributed antenna system |
| WO2012024349A1 (en) | 2010-08-17 | 2012-02-23 | Dali Systems Co. Ltd. | Daisy-chained ring of remote units for a distributed antenna system |
| KR101610447B1 (ko) | 2010-08-17 | 2016-04-08 | 달리 시스템즈 씨오. 엘티디. | 원격으로 재구성가능한 분산 안테나 시스템 및 방법 |
| US8649388B2 (en) | 2010-09-02 | 2014-02-11 | Integrated Device Technology, Inc. | Transmission of multiprotocol data in a distributed antenna system |
| CN103597807B (zh) | 2010-09-14 | 2015-09-30 | 大理系统有限公司 | 远程可重新配置的分布式天线系统和方法 |
| US8532242B2 (en) | 2010-10-27 | 2013-09-10 | Adc Telecommunications, Inc. | Distributed antenna system with combination of both all digital transport and hybrid digital/analog transport |
| CN106850735B (zh) | 2011-02-07 | 2021-07-16 | 大力系统有限公司 | 无线通信传输 |
| US9439242B2 (en) | 2012-08-13 | 2016-09-06 | Dali Systems Co., Ltd. | Time synchronized routing in a distributed antenna system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8855234B2 (en) | 2006-12-26 | 2014-10-07 | Dali Systems Co. Ltd. | Method and system for baseband predistortion linearization in multi-channel wideband communications systems |
| US9246731B2 (en) | 2006-12-26 | 2016-01-26 | Dali Systems Co. Ltd. | Method and system for baseband predistortion linearization in multi-channel wideband communication systems |
| US9913194B2 (en) | 2006-12-26 | 2018-03-06 | Dali Wireless, Inc. | Method and system for baseband predistortion linearization in multi-channel wideband communication systems |
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