WO2004008782A3 - Adaptive noise filtering and equalization - Google Patents

Adaptive noise filtering and equalization Download PDF

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Publication number
WO2004008782A3
WO2004008782A3 PCT/US2003/022237 US0322237W WO2004008782A3 WO 2004008782 A3 WO2004008782 A3 WO 2004008782A3 US 0322237 W US0322237 W US 0322237W WO 2004008782 A3 WO2004008782 A3 WO 2004008782A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
fidelity
conditioned
equalization
filter
Prior art date
Application number
PCT/US2003/022237
Other languages
French (fr)
Other versions
WO2004008782A2 (en
Inventor
Andrew Joo Kim
Vincent Mark Hietala
Sanjay Bajekal
Original Assignee
Quellan 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 Quellan Inc filed Critical Quellan Inc
Priority to AU2003256569A priority Critical patent/AU2003256569A1/en
Publication of WO2004008782A2 publication Critical patent/WO2004008782A2/en
Publication of WO2004008782A3 publication Critical patent/WO2004008782A3/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
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • H04L25/03076—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure not using decision feedback
    • 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
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03356—Baseband transmission
    • H04L2025/03363—Multilevel
    • 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
    • H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
    • H04L2025/03439—Fixed structures
    • H04L2025/03445—Time domain
    • H04L2025/03471—Tapped delay lines
    • 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
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03254—Operation with other circuitry for removing intersymbol interference
    • H04L25/03267—Operation with other circuitry for removing intersymbol interference with decision feedback equalisers

Abstract

A Signal Conditioning Filter (SCF) and a Signal Integrity Unit (SIU) address the coupled problem of equalization and noise filtering in order to improve signal fidelity for decoding. Specifically, a received signal can be filtered in a manner to optimize the signal fidelity even in the presence of both significant (large magnitudes of) ISI and noise. The present invention can provide an adaptive method that continuously monitors a signal fidelity measure. Monitoring the fidelity of a multilevel signal can be performed by external means such as by the SIU. A received signal y(t) can be 'conditioned' by application of a filter with an electronically adjustable impulse response g(t), A resulting output Z (t) can then be interrogated to characterize the quality of the conditioned signal. This fidelity measure q (t) can be used to adjust the filter response to maximize the fidelity measure of the conditioned signal.
PCT/US2003/022237 2002-07-15 2003-07-15 Adaptive noise filtering and equalization WO2004008782A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003256569A AU2003256569A1 (en) 2002-07-15 2003-07-15 Adaptive noise filtering and equalization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39606502P 2002-07-15 2002-07-15
US60/396,065 2002-07-15

Publications (2)

Publication Number Publication Date
WO2004008782A2 WO2004008782A2 (en) 2004-01-22
WO2004008782A3 true WO2004008782A3 (en) 2009-06-18

Family

ID=30115963

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/022237 WO2004008782A2 (en) 2002-07-15 2003-07-15 Adaptive noise filtering and equalization

Country Status (3)

Country Link
US (4) US7035361B2 (en)
AU (1) AU2003256569A1 (en)
WO (1) WO2004008782A2 (en)

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US8594258B2 (en) 2013-11-26
US7035361B2 (en) 2006-04-25
US20040012433A1 (en) 2004-01-22
US7573966B2 (en) 2009-08-11
WO2004008782A2 (en) 2004-01-22
AU2003256569A8 (en) 2009-07-30
US8311168B2 (en) 2012-11-13
US20100040180A1 (en) 2010-02-18
US20130064335A1 (en) 2013-03-14
US20060239390A1 (en) 2006-10-26

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