JP2004236317A - 同相モード成分を用いて不平衡チャネルにおけるノイズを低減する方法および装置 - Google Patents
同相モード成分を用いて不平衡チャネルにおけるノイズを低減する方法および装置 Download PDFInfo
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- JP2004236317A JP2004236317A JP2004019117A JP2004019117A JP2004236317A JP 2004236317 A JP2004236317 A JP 2004236317A JP 2004019117 A JP2004019117 A JP 2004019117A JP 2004019117 A JP2004019117 A JP 2004019117A JP 2004236317 A JP2004236317 A JP 2004236317A
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- common mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalance current in a normally balanced line
Abstract
【解決手段】不平衡チャネルにおける外部ノイズ、クロストーク、およびエコーなどのノイズを低減する方法および装置を開示する。多次元有限時間インパルス応答フィルタを用いて、受信信号の差動dおよび同相モードc成分の両方を処理するクロストーク消去装置を開示する。受信信号の差動モード成分の回復は、同相モード成分の寄与を低減することによって改善される。受信信号の同相モード成分は、たとえば、2つの電圧または2つの電流信号の平均として表現できる。受信信号の差動および同相モード成分は等化される。開示した多次元クロストーク消去装置は外部ノイズ、別の撚線対と干渉する1つの撚線対上で差動および同相モード成分から生ずるニアエンド・クロストーク、および同じ撚線対上で差動および同相モード・クロストーク成分から生ずるエコー・クロストークを低減する。
【選択図】図3
Description
本発明のさらに完全な理解、ならびに本発明のさらなる特徴および利点は、以下の詳細な説明および図面を参照することにより得られるであろう。
H(z)=W0+W1z−1+W2z−2+W3z−3+... 式(1)
たとえば、上記の式における第1の重み項W0はどの遅延にも対応しておらず、第2項W1z−1は1段の遅延に対応している。従来の形態については、各フィルタ・タップに適用される重みwnはスカラー値であり、一方、本発明において各フィルタ・タップに適用される重みWnはマトリックス値(この例においては8×8マトリックス)である点に留意されたい。適切な有限時間インパルス応答フィルタに関するより詳細な説明は、たとえば、参照により本明細書に組み込まれている米国特許第5,983,254号を参照されたい。米国特許第5,983,254号に記載された有限時間インパルス応答フィルタを本発明の多次元の場合に拡張することは、「Multi−Dimensional Hybrid and Transpose Form Finite Impulse Response Filters」という名称の米国特許出願(Attorney Docket Number Azadet 26)に記載されている。
Y(z)=H(z)Tx(z)
ここで、H(z)は上記で定義したマトリックスであり、Tx(z)は送信信号のベクトル表示である。時間領域において、クロストーク消去装置330の出力の出力Ynは次のように表すことができる。
Yn=W0Txn+W1Txn−1+W2Txn−2+...
ここで、nはこの例においては1から8の間の値である。
Claims (10)
- 1または複数の撚線対上の受信信号を処理する方法であって、
前記受信信号の差動成分を生成するステップと、
前記受信信号の同相モード成分を生成するステップと、
前記差動および同相モード成分を用いて前記受信信号からノイズを除去するステップとを含む方法。 - 前記受信信号を等化するステップをさらに含む、請求項1に記載の方法。
- 前記除去ステップは、別の撚線対上の信号と干渉する1つの撚線対上の信号から生ずるニアエンド・クロストークを除去するステップをさらに含む、請求項1に記載の方法。
- 前記除去ステップは、同じ撚線対上のクロストークから生ずるエコー・クロストークを除去するステップをさらに含む、請求項1に記載の方法。
- 前記差動および同相モード成分のベクトル表示を生成するステップをさらに含む、請求項1に記載の方法。
- 前記ベクトル表示は各撚線対に関する差動および同相モード成分を含む、請求項5に記載の方法。
- 前記除去ステップは、送信信号の同相モード成分を生成するステップをさらに含む、請求項1に記載の方法。
- 前記送信信号の前記同相モード成分を含むベクトル表示を、多次元有限時間インパルス応答フィルタに適用するステップをさらに含む、請求項7に記載の方法。
- 受信信号の差動成分および同相モード成分を生成するフロントエンド・プロセッサと、
前記差動および同相モード成分を用いて、前記受信信号からノイズを除去するクロストーク消去装置とを含む、受信機。 - 前記受信信号を等化する等化器をさらに含む、請求項9に記載の受信機。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US44326103P | 2003-01-28 | 2003-01-28 | |
US10/610,335 US8126078B2 (en) | 2003-01-28 | 2003-06-30 | Method and apparatus for reducing noise in an unbalanced channel using common mode component |
Publications (2)
Publication Number | Publication Date |
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JP2004236317A true JP2004236317A (ja) | 2004-08-19 |
JP4643151B2 JP4643151B2 (ja) | 2011-03-02 |
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JP2004019117A Expired - Fee Related JP4643151B2 (ja) | 2003-01-28 | 2004-01-28 | 同相モード成分を用いて不平衡チャネルにおけるノイズを低減する方法および装置 |
Country Status (3)
Country | Link |
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US (1) | US8126078B2 (ja) |
EP (1) | EP1443675B1 (ja) |
JP (1) | JP4643151B2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020053979A (ja) * | 2016-01-25 | 2020-04-02 | ヴァレンス セミコンダクター リミテッド | 高速適応型デジタルキャンセラ |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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US8126078B2 (en) | 2003-01-28 | 2012-02-28 | Agere Systems Inc. | Method and apparatus for reducing noise in an unbalanced channel using common mode component |
US8442099B1 (en) | 2008-09-25 | 2013-05-14 | Aquantia Corporation | Crosstalk cancellation for a common-mode channel |
US8625704B1 (en) | 2008-09-25 | 2014-01-07 | Aquantia Corporation | Rejecting RF interference in communication systems |
US9912375B1 (en) | 2008-09-25 | 2018-03-06 | Aquantia Corp. | Cancellation of alien interference in communication systems |
CN102244528B (zh) * | 2010-05-13 | 2014-04-30 | 华为技术有限公司 | 扩展信道的方法、设备和系统 |
US8891595B1 (en) | 2010-05-28 | 2014-11-18 | Aquantia Corp. | Electromagnetic interference reduction in wireline applications using differential signal compensation |
US9118469B2 (en) * | 2010-05-28 | 2015-08-25 | Aquantia Corp. | Reducing electromagnetic interference in a received signal |
US8724678B2 (en) | 2010-05-28 | 2014-05-13 | Aquantia Corporation | Electromagnetic interference reduction in wireline applications using differential signal compensation |
US8792597B2 (en) | 2010-06-18 | 2014-07-29 | Aquantia Corporation | Reducing electromagnetic interference in a receive signal with an analog correction signal |
US8861663B1 (en) | 2011-12-01 | 2014-10-14 | Aquantia Corporation | Correlated noise canceller for high-speed ethernet receivers |
US8929468B1 (en) | 2012-06-14 | 2015-01-06 | Aquantia Corp. | Common-mode detection with magnetic bypass |
US11914820B2 (en) * | 2020-04-14 | 2024-02-27 | Synaptics Incorporated | Distributed analog display noise suppression circuit |
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2003
- 2003-06-30 US US10/610,335 patent/US8126078B2/en active Active
- 2003-12-09 EP EP03257734.8A patent/EP1443675B1/en not_active Expired - Fee Related
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- 2004-01-28 JP JP2004019117A patent/JP4643151B2/ja not_active Expired - Fee Related
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JP4643151B2 (ja) | 2011-03-02 |
EP1443675B1 (en) | 2019-02-06 |
EP1443675A2 (en) | 2004-08-04 |
US8126078B2 (en) | 2012-02-28 |
EP1443675A3 (en) | 2004-09-01 |
US20050018777A1 (en) | 2005-01-27 |
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