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1.发明公开SYSTEMS AND METHODS FOR MITIGATING THE EFFECTS OF UPSTREAM FAR-END CROSS TALK 审中-公开系统和方法减小信号UP远端谈论的影响
公开(公告)号：EP2220772A1
公开(公告)日：2010-08-25
申请号：EP08849224.4
申请日：2008-10-20
发明人： DUVAUT, Patrick , MAHADEVAN, Amitkumar , BIYANI, Pravesh , SINGH, Shailendra , MAHESHWARI, Satyavardhan
IPC分类号： H04B1/00
CPC分类号： H04L25/03159 , H04B3/32 , H04L27/2601 , H04L2025/03426 , H04L2025/03522
摘要： Systems and methods for mitigating the effects of self-FEXT within an xDSL system are described. At least one embodiment is a method for reducing self-induced far end crosstalk (self-FEXT) in a multiple input multiple output (MIMO) digital subscriber line (xDSL) system. The method comprises deriving an initial value for an off-diagonal multiple input multiple output canceller (ODMC) while the ODMC is inactive and while in data mode. The method further comprises activating the initial ODMC and converging towards an steady-state value for the ODMC by performing an adaptive algorithm to maximize the Shannon's capacity of the system and to reduce upstream self- FEXT. The method also comprises performing bit loading and updating a frequency domain equalizer (FEQ).
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2.发明授权METHOD AND SYSTEM FOR VIRTUAL EXCHANGE REFERENCE IMPACT (VERI) FOR USE IN MIXED SPECTRUM MANAGEMENT IN DSL 有权FOR USE IN混合光谱管理DSL方法和系统VERI（虚拟参考Exchange IMPACT）
公开(公告)号：EP1829269B1
公开(公告)日：2013-11-20
申请号：EP05853800.0
申请日：2005-12-13
摘要： A method and apparatus implements a Virtual Exchange Reference Impact (VERI) technique to define a pattern to shape the spectrum of a cabinet deployed system to minimize its impact, e.g., FEXT, into an exchange deployed system while achieving effective cabinet system performance, e.g., in terms of data transmission rate. The invention shapes the cabinet system to replicate a self-impact of the exchange system on itself based on the known distance of the cabinet from the exchange. The shaping is required when both exchange and cabinet systems share the same bundle and exhibit overlapped bandwidths. A particular example consists of VDSL deployed from remote cabinet impacting ADSL2/ADSL2+ deployed from the exchange.
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公开(公告)号：EP2241007A1
公开(公告)日：2010-10-20
申请号：EP09700928.6
申请日：2009-01-05
IPC分类号： H03H7/30
CPC分类号： H04L1/1867 , H04L1/0009 , H04L1/0019 , H04L1/0057 , H04L1/0071 , H04L1/1812 , H04L1/20 , H04L27/2601
摘要： Various embodiments for mitigating impulse noise are disclosed that cooperatively use impulse noise statistics to utilize retransmission, forward error correction (FEC), and blanking to mitigate the effects of a wide variety of impulse noise sources.
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4.发明公开COOPERATIVE MIMO FOR ALIEN NOISE CANCELLATION (COMAC) FOR UPSTREAM VDSL SYSTEMS 审中-公开协作式MIMO为外国噪声消除（COMAC）上游VDSL系统
公开(公告)号：EP2263337A1
公开(公告)日：2010-12-22
申请号：EP08873838.0
申请日：2008-12-22
IPC分类号： H04J1/12
CPC分类号： H04L27/2647 , H04B3/32
摘要： Included are embodiments for reducing alien crosstalk. At least one embodiment of a method includes receiving noise data associated with a first user signal on a first tone, receiving noise data associated with a second user signal on the first tone, and receiving at least one alien crosstalk canceller coefficient for the first user on the first tone. Some embodiments include applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk for the first user signal.
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公开(公告)号：EP2055014B1
公开(公告)日：2013-03-06
申请号：EP07814423.5
申请日：2007-08-24
CPC分类号： H04B3/32 , H04L1/0042
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公开(公告)号：EP2321907A1
公开(公告)日：2011-05-18
申请号：EP09812148.6
申请日：2009-09-02
IPC分类号： H04B3/46
CPC分类号： H04B3/46
摘要： Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines (DSL). The characterization of the nature, timing and length of impulse noise sources present on a DSL loop is a critical first step in mitigating the effect of impulse noise on DSL communications. DSL standards provide histograms for impulse length and inter-arrival time of impulses. These histograms can be used to derive the nature, maximum frequency and other statistics related to impulse noise on a DSL line.
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