GB1587421A - Method of and apparatus for digital signal equalization - Google Patents

Method of and apparatus for digital signal equalization Download PDF

Info

Publication number
GB1587421A
GB1587421A GB26803/77A GB2680377A GB1587421A GB 1587421 A GB1587421 A GB 1587421A GB 26803/77 A GB26803/77 A GB 26803/77A GB 2680377 A GB2680377 A GB 2680377A GB 1587421 A GB1587421 A GB 1587421A
Authority
GB
United Kingdom
Prior art keywords
cursor
signal
post
correction
output
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB26803/77A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
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
Priority claimed from IT6856176A external-priority patent/IT1071212B/it
Priority claimed from IT6933376A external-priority patent/IT1078647B/it
Priority claimed from IT6741777A external-priority patent/IT1118072B/it
Application filed by CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of GB1587421A publication Critical patent/GB1587421A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/01—Equalisers
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Dc Digital Transmission (AREA)
GB26803/77A 1976-06-25 1977-06-27 Method of and apparatus for digital signal equalization Expired GB1587421A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT6856176A IT1071212B (it) 1976-06-25 1976-06-25 Procedimento e dispositivo per la equalizzazione non lineare di segnali numerici
IT6933376A IT1078647B (it) 1976-09-30 1976-09-30 Procedimento e dispositivo per l'equalizzazione non lineare di segnali numerici
IT6741777A IT1118072B (it) 1977-02-25 1977-02-25 Procedimento e dispositivo per l equalizzazione non lineare di segnali numerici

Publications (1)

Publication Number Publication Date
GB1587421A true GB1587421A (en) 1981-04-01

Family

ID=27273771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26803/77A Expired GB1587421A (en) 1976-06-25 1977-06-27 Method of and apparatus for digital signal equalization

Country Status (5)

Country Link
US (1) US4170758A (enExample)
CH (1) CH625924A5 (enExample)
DE (1) DE2727874C3 (enExample)
GB (1) GB1587421A (enExample)
NL (1) NL175250C (enExample)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491114A (en) * 1977-12-21 1979-07-19 Cselt Centro Studi Lab Telecom Method of and device for nonlinearly equalizing digital signal
IT1118625B (it) * 1979-05-11 1986-03-03 Cselt Centro Studi Lab Telecom Perfezionamenti agli equializzatori per trasmissione di segnali numeri ci
DE2928424C2 (de) * 1979-07-13 1981-09-10 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur automatischen adaptiven, zeitlichen Entzerrung der Nachschwinger eines mindestens dreistufigen Basisbandsignals
US4356558A (en) * 1979-12-20 1982-10-26 Martin Marietta Corporation Optimum second order digital filter
DE3129343C2 (de) * 1981-07-24 1987-01-29 Siemens AG, 1000 Berlin und 8000 München Adaptiver Entzerrer für ein demoduliertes QAM-Signal
IT1154430B (it) * 1982-01-15 1987-01-21 Cselt Centro Studi Lab Telecom Equalizzatore per tramissione di segnali numerici
US4528676A (en) * 1982-06-14 1985-07-09 Northern Telecom Limited Echo cancellation circuit using stored, derived error map
US4468786A (en) * 1982-09-21 1984-08-28 Harris Corporation Nonlinear equalizer for correcting intersymbol interference in a digital data transmission system
IT1159580B (it) * 1983-05-05 1987-03-04 Cselt Centro Studi Lab Telecom Perfezionamenti agli equalizzatori per la correzione di segnali numerici con un ramo di post decisione e un ramo di pre decisione in parallelo
US4520489A (en) * 1983-08-15 1985-05-28 Rockwell International Corporation Decision feedback equalizing apparatus
NL8701333A (nl) * 1987-06-09 1989-01-02 Philips Nv Inrichting voor het bestrijden van intersymboolinterferentie en ruis.
US4789994A (en) * 1987-08-12 1988-12-06 American Telephone And Telegraph Company, At&T Bell Laboratories Adaptive equalizer using precursor error signal for convergence control
US4759035A (en) * 1987-10-01 1988-07-19 Adtran Digitally controlled, all rate equalizer
US5031194A (en) * 1989-08-11 1991-07-09 Bell Communications Research, Inc. Wideband digital equalizers for subscriber loops
US5020078A (en) * 1989-08-11 1991-05-28 Bell Communications Research, Inc. Baudrate timing recovery technique
US5148427A (en) * 1990-04-10 1992-09-15 Level One Communications, Inc. Non-linear echo canceller
US5181228A (en) * 1990-10-12 1993-01-19 Level One Communications, Inc. System and method for phase equalization
US5157690A (en) * 1990-10-30 1992-10-20 Level One Communications, Inc. Adaptive convergent decision feedback equalizer
US5257286A (en) * 1990-11-13 1993-10-26 Level One Communications, Inc. High frequency receive equalizer
US6167082A (en) * 1997-03-06 2000-12-26 Level One Communications, Inc. Adaptive equalizers and methods for carrying out equalization with a precoded transmitter
US5880645A (en) * 1997-07-03 1999-03-09 Level One Communications, Inc. Analog adaptive equalizer with gain and filter correction
US20030063663A1 (en) * 2001-10-01 2003-04-03 Bryant Paul Henry Multistage equalizer that corrects for linear and nonlinear distortion in a digitally-modulated signal
AU2003216467A1 (en) * 2003-02-26 2004-09-28 Chaos Telecom, Inc A multistage equalizer that corrects for linear and nonlinear distortion in a digitally-modulated signal
US7177352B1 (en) 2004-05-28 2007-02-13 Pmc-Sierra, Inc. Pre-cursor inter-symbol interference cancellation
DE102006001673B4 (de) * 2006-01-12 2013-02-07 Infineon Technologies Ag Filter-Schaltungsanordnung
US8428113B1 (en) 2009-01-23 2013-04-23 Pmc-Sierra, Inc. Equalizer for heavily clipped or compressed communications signals
US8644369B1 (en) 2009-12-01 2014-02-04 Pmc-Sierra, Inc. Equalizer adaptation for heavily compressed or clipped communications signals

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2178764B1 (enExample) * 1972-04-04 1974-08-02 Ibm France
US3755738A (en) * 1972-05-01 1973-08-28 Bell Telephone Labor Inc Passband equalizer for phase-modulated data signals
US3914691A (en) * 1974-08-21 1975-10-21 Bell Telephone Labor Inc Repositioning of equalizer tap-gain coefficients
FR2283606A1 (fr) * 1974-08-30 1976-03-26 Stern Thomas Filtre de phase pour reduire les effets des composantes de bruit affectant les signaux modules en phase par les valeurs discretes
FR2301978A1 (fr) * 1975-02-21 1976-09-17 Ibm France Egaliseur recursif a decision dirigee par la valeur de la phase du signal recu
IT1030453B (it) * 1975-03-27 1979-03-30 Cselt Centro Studi Lab Telecom Organo di decisione per ricevitori di segnali numerici a piu livelli modulati in fase o in fase e ampiezza
US3993956A (en) * 1975-11-03 1976-11-23 Motorola, Inc. Digital detection system for differential phase shift keyed signals
US4032847A (en) * 1976-01-05 1977-06-28 Raytheon Company Distortion adapter receiver having intersymbol interference correction

Also Published As

Publication number Publication date
DE2727874A1 (de) 1977-12-29
DE2727874B2 (de) 1978-11-02
NL7706938A (nl) 1977-12-28
DE2727874C3 (de) 1979-07-12
CH625924A5 (enExample) 1981-10-15
NL175250C (nl) 1984-10-01
NL175250B (nl) 1984-05-01
US4170758A (en) 1979-10-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee
PCPE Delete 'patent ceased' from journal

Free format text: 4900

PCNP Patent ceased through non-payment of renewal fee