WO2004004192A3 - Method and apparatus for channel equalization - Google Patents

Method and apparatus for channel equalization Download PDF

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Publication number
WO2004004192A3
WO2004004192A3 PCT/US2003/020255 US0320255W WO2004004192A3 WO 2004004192 A3 WO2004004192 A3 WO 2004004192A3 US 0320255 W US0320255 W US 0320255W WO 2004004192 A3 WO2004004192 A3 WO 2004004192A3
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WO
WIPO (PCT)
Prior art keywords
filter
coefficients
intersymbol interference
effects
feedforward
Prior art date
Application number
PCT/US2003/020255
Other languages
French (fr)
Other versions
WO2004004192A2 (en
Inventor
William Jones
Original Assignee
Solarflare Comm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Solarflare Comm Inc filed Critical Solarflare Comm Inc
Priority to AT03762110T priority Critical patent/ATE456188T1/en
Priority to EP03762110A priority patent/EP1540820B1/en
Priority to JP2004517928A priority patent/JP2005531989A/en
Priority to AU2003253733A priority patent/AU2003253733A1/en
Priority to DE60331082T priority patent/DE60331082D1/en
Publication of WO2004004192A2 publication Critical patent/WO2004004192A2/en
Publication of WO2004004192A3 publication Critical patent/WO2004004192A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
    • H04L25/03146—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a recursive structure

Abstract

A method and apparatus is disclosed to overcome the effects of intersymbol interference during data transmission. Overcoming the effects of intersymbol interference makes possible higher data transmission rates for a given error rate. In one embodiment a receiver-transmitter pair is configured with a precode filter at the transmit side and a feed forward filter and a feedback filter at the receive side. Filter coefficients are calculated to reduce the undesirable effects of the channel, such as intersymbol interference. In one embodiment a training process occurs with the feedforward filter and a feedback filter, such that the first N coefficients of the feedback filter are set to zero. Thereafter, the coefficients of the feedforward filter are subject to spectral factorization and separated into minimum phase roots and maximum phase roots. The minimum phase roots comprise the precode filter coefficients and the maximum phase roots are established as feedforward filter coefficients.
PCT/US2003/020255 2002-07-01 2003-06-27 Method and apparatus for channel equalization WO2004004192A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT03762110T ATE456188T1 (en) 2002-07-01 2003-06-27 METHOD AND DEVICE FOR CHANNEL EQUALIZATION
EP03762110A EP1540820B1 (en) 2002-07-01 2003-06-27 Method and apparatus for channel equalization
JP2004517928A JP2005531989A (en) 2002-07-01 2003-06-27 Method and apparatus for equalizing communication paths
AU2003253733A AU2003253733A1 (en) 2002-07-01 2003-06-27 Method and apparatus for channel equalization
DE60331082T DE60331082D1 (en) 2002-07-01 2003-06-27 METHOD AND DEVICE FOR CHANNEL DEACIFICATION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/188,274 2002-07-01
US10/188,274 US6961373B2 (en) 2002-07-01 2002-07-01 Method and apparatus for channel equalization

Publications (2)

Publication Number Publication Date
WO2004004192A2 WO2004004192A2 (en) 2004-01-08
WO2004004192A3 true WO2004004192A3 (en) 2004-04-08

Family

ID=29780110

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/020255 WO2004004192A2 (en) 2002-07-01 2003-06-27 Method and apparatus for channel equalization

Country Status (8)

Country Link
US (3) US6961373B2 (en)
EP (1) EP1540820B1 (en)
JP (1) JP2005531989A (en)
CN (1) CN100342645C (en)
AT (1) ATE456188T1 (en)
AU (1) AU2003253733A1 (en)
DE (1) DE60331082D1 (en)
WO (1) WO2004004192A2 (en)

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JP2005531989A (en) 2005-10-20
US20050025229A1 (en) 2005-02-03
US7257181B2 (en) 2007-08-14
CN1675837A (en) 2005-09-28
AU2003253733A1 (en) 2004-01-19
ATE456188T1 (en) 2010-02-15
EP1540820B1 (en) 2010-01-20
US20060007997A1 (en) 2006-01-12
EP1540820A4 (en) 2007-12-12
US7400677B2 (en) 2008-07-15
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US20040001540A1 (en) 2004-01-01
US6961373B2 (en) 2005-11-01

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