CA2073918A1 - Method and apparatus for updating coefficients in a complex adaptive equalizer - Google Patents

Method and apparatus for updating coefficients in a complex adaptive equalizer

Info

Publication number
CA2073918A1
CA2073918A1 CA2073918A CA2073918A CA2073918A1 CA 2073918 A1 CA2073918 A1 CA 2073918A1 CA 2073918 A CA2073918 A CA 2073918A CA 2073918 A CA2073918 A CA 2073918A CA 2073918 A1 CA2073918 A1 CA 2073918A1
Authority
CA
Canada
Prior art keywords
equalizer
complex
coefficients
updated
filters
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.)
Granted
Application number
CA2073918A
Other languages
French (fr)
Other versions
CA2073918C (en
Inventor
Woo H. Paik
Scott A. Lery
Allen Wu
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.)
Arris Technology Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2073918A1 publication Critical patent/CA2073918A1/en
Application granted granted Critical
Publication of CA2073918C publication Critical patent/CA2073918C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H04L25/03038—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a non-recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
    • 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
    • H04L2025/03375—Passband transmission
    • H04L2025/0342—QAM
    • 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
    • H04L2025/03477—Tapped delay lines not time-recursive
    • 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
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03617—Time recursive algorithms

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

Convergence of a complex adaptive equalizer used in digital communications is substantially improved by updating all coefficients of the equalizer during each filter clock cycle. Complex signal data is passed through a plurality of successive delay stages to provide N sets of delayed complex signal data. The product of each set and a complex error signal is obtained. Each product is concurrently updated with previous product data for the set to provide N sets of updated complex coefficients for selective input to equalizer filters. In an illustrated embodiment, the updated coefficients are truncated and their gain is adjusted prior to input to the filters. The updated coefficients can be multiplexed to provide a clocked stream of coefficient sets for input to the equalizer filters. A VLSI implementation of the equalizer is also disclosed.
CA002073918A 1991-07-26 1992-07-15 Method and apparatus for updating coefficients in a complex adaptive equalizer Expired - Fee Related CA2073918C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/733,791 US5243624A (en) 1991-07-26 1991-07-26 Method and apparatus for updating coefficients in a complex adaptive equalizer
US07/733,791 1991-07-26

Publications (2)

Publication Number Publication Date
CA2073918A1 true CA2073918A1 (en) 1993-01-27
CA2073918C CA2073918C (en) 2000-12-19

Family

ID=24949130

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002073918A Expired - Fee Related CA2073918C (en) 1991-07-26 1992-07-15 Method and apparatus for updating coefficients in a complex adaptive equalizer

Country Status (11)

Country Link
US (1) US5243624A (en)
EP (1) EP0524560B1 (en)
JP (1) JPH05226975A (en)
KR (1) KR950006765B1 (en)
AT (1) ATE157826T1 (en)
AU (1) AU646618B2 (en)
CA (1) CA2073918C (en)
DE (1) DE69221970T2 (en)
HK (1) HK1004935A1 (en)
IE (1) IE80616B1 (en)
NO (1) NO303898B1 (en)

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US5930687A (en) * 1996-09-30 1999-07-27 Usa Digital Radio Partners, L.P. Apparatus and method for generating an AM-compatible digital broadcast waveform
FR2754125B1 (en) * 1996-09-30 2004-07-09 Sc Reprosol DEVICE AND METHOD FOR VECTOR EQUALIZATION OF AN OFDM SIGNAL
US5940441A (en) * 1996-10-29 1999-08-17 International Business Machines Corporation Integrated adaptive cable equalizer using a continuous-time filter
KR100226698B1 (en) * 1996-12-28 1999-10-15 전주범 Channel equalizer for use in ofdm receiving system
US6128334A (en) * 1997-02-21 2000-10-03 Usa Digital Radio, Inc. Receiver addressable AM compatible digital broadcast system
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Also Published As

Publication number Publication date
EP0524560B1 (en) 1997-09-03
US5243624A (en) 1993-09-07
IE80616B1 (en) 1998-10-21
DE69221970D1 (en) 1997-10-09
HK1004935A1 (en) 1998-12-11
ATE157826T1 (en) 1997-09-15
CA2073918C (en) 2000-12-19
NO922857L (en) 1993-01-27
NO303898B1 (en) 1998-09-14
DE69221970T2 (en) 1998-03-26
EP0524560A2 (en) 1993-01-27
NO922857D0 (en) 1992-07-17
AU646618B2 (en) 1994-02-24
IE922325A1 (en) 1993-01-27
JPH05226975A (en) 1993-09-03
KR930003753A (en) 1993-02-24
EP0524560A3 (en) 1993-05-19
KR950006765B1 (en) 1995-06-22
AU2031192A (en) 1993-01-28

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