WO2002015505A3 - Adaption of the feedforward section of an equaliser - Google Patents

Adaption of the feedforward section of an equaliser Download PDF

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Publication number
WO2002015505A3
WO2002015505A3 PCT/US2001/022339 US0122339W WO0215505A3 WO 2002015505 A3 WO2002015505 A3 WO 2002015505A3 US 0122339 W US0122339 W US 0122339W WO 0215505 A3 WO0215505 A3 WO 0215505A3
Authority
WO
WIPO (PCT)
Prior art keywords
equaliser
adaption
prefilter
compute
filter coefficients
Prior art date
Application number
PCT/US2001/022339
Other languages
French (fr)
Other versions
WO2002015505A2 (en
Inventor
Kambiz C Zangi
Raymond Toy
Dennis Hui
Original Assignee
Ericsson Inc
Kambiz C Zangi
Raymond Toy
Dennis Hui
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 Ericsson Inc, Kambiz C Zangi, Raymond Toy, Dennis Hui filed Critical Ericsson Inc
Priority to AU2001273500A priority Critical patent/AU2001273500A1/en
Priority to EP01952781A priority patent/EP1310070A2/en
Publication of WO2002015505A2 publication Critical patent/WO2002015505A2/en
Publication of WO2002015505A3 publication Critical patent/WO2002015505A3/en

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
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • 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
    • H04L2025/03484—Tapped delay lines time-recursive
    • H04L2025/0349—Tapped delay lines time-recursive as a feedback filter
    • 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
    • H04L2025/03605—Block algorithms

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

A computationally efficient method for computing the filter coefficients for a prefilter in a decision feedback equalizer solves linear equations using a fast Toeplitz algorithm. Computations performed to compute the filter coefficients for the right half burst may be used to compute the prefilter for the left hand burst, thereby reducing the number of computations. Also, a square root-free algorithm may be used to solve the system of linear equations, further reducing computational complexity.
PCT/US2001/022339 2000-08-14 2001-07-17 Adaption of the feedforward section of an equaliser WO2002015505A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001273500A AU2001273500A1 (en) 2000-08-14 2001-07-17 Adaption of the feedforward section of an equaliser
EP01952781A EP1310070A2 (en) 2000-08-14 2001-07-17 Adaptation of the feedforward section of an equaliser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/638,718 2000-08-14
US09/638,718 US6775322B1 (en) 2000-08-14 2000-08-14 Equalizer with adaptive pre-filter

Publications (2)

Publication Number Publication Date
WO2002015505A2 WO2002015505A2 (en) 2002-02-21
WO2002015505A3 true WO2002015505A3 (en) 2002-08-29

Family

ID=24561155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/022339 WO2002015505A2 (en) 2000-08-14 2001-07-17 Adaption of the feedforward section of an equaliser

Country Status (4)

Country Link
US (1) US6775322B1 (en)
EP (1) EP1310070A2 (en)
AU (1) AU2001273500A1 (en)
WO (1) WO2002015505A2 (en)

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GB2362073B (en) * 2000-05-03 2003-12-17 Siemens Ag Equaliser and method of state reduction therefor
US7027500B1 (en) * 2000-12-12 2006-04-11 Ati Research, Inc. Linear prediction based initialization of a single-axis blind equalizer for VSB signals
KR200226168Y1 (en) * 2000-12-28 2001-06-01 엘지전자주식회사 Mobile communication apparatus with equalizer functions
US7050513B1 (en) * 2001-02-20 2006-05-23 Comsys Communications & Signal Processing Ltd. Block based channel tracking using weighted recursive least squares
DE60214094T2 (en) * 2001-07-19 2007-04-12 TransCore Link Logistics Corp., Mississauga Phase tracking device for linearly modulated signals
US7010030B2 (en) * 2001-07-20 2006-03-07 Koninklijke Philips Electronics N.V. Software definable block adaptive decision feedback equalizer
US7003228B2 (en) * 2001-09-11 2006-02-21 Vitesse Semiconductor Corporation Method and apparatus for improved high-speed adaptive equalization
US6940922B2 (en) * 2001-10-10 2005-09-06 Agilent Technologies, Inc. Response calibration method using a frequency-shifted receiver
US7263119B1 (en) * 2001-11-29 2007-08-28 Marvell International Ltd. Decoding method and apparatus
US7953193B2 (en) * 2002-03-28 2011-05-31 Broadcom Corporation Sparse channel equalization
US7151797B2 (en) * 2002-05-14 2006-12-19 Limberg Allen Leroy Adaptive K-factor-improvement filter for receiver of radio signals subject to multipath distortion
US7266146B2 (en) * 2002-06-18 2007-09-04 Ralink Technology, Inc. Symbol-based decision feedback equalizer (DFE) optimal equalization method and apparatus with maximum likelihood sequence estimation for wireless receivers under multipath channels
US7505695B2 (en) 2003-04-23 2009-03-17 Mitsubishi Denki Kabushiki Kaisha Optical receiver and optical transmission system
US7675968B2 (en) * 2003-09-29 2010-03-09 Hiroshi Takatori Adaptive FIR filter and method
US20050100052A1 (en) * 2003-11-10 2005-05-12 Mailaender Laurence E. Method and apparatus for receiver processing in a CDMA communications system
US7327808B2 (en) * 2004-03-17 2008-02-05 Faraday Technology Corp. Pipelined adaptive decision feedback equalizer
US7388935B2 (en) * 2004-06-15 2008-06-17 Telefonktiebolaget Lm Ericsson (Publ) Method of inverting nearly Toeplitz or block Toeplitz matrices
US7586997B2 (en) * 2004-08-16 2009-09-08 Beceem Communications Inc. Method and system for maximum transmit diversity
US8014879B2 (en) * 2005-11-11 2011-09-06 L&L Engineering, Llc Methods and systems for adaptive control
KR100732159B1 (en) 2006-02-06 2007-06-25 삼성전자주식회사 Method for reducing a number of computation during equalization and apparatus using the same
US8671128B1 (en) * 2006-06-21 2014-03-11 Ikanos Communications, Inc. Method and apparatus for a finite impulse response filter
WO2008017897A1 (en) * 2006-08-08 2008-02-14 Petros Stavroulakis Secure telecommunications systems based on chaotic and interference reduction techniques
US7925231B2 (en) * 2006-10-25 2011-04-12 The Directv Group, Inc. Passive system and method to determine distortion in an RF satellite chain
US8126044B2 (en) * 2006-10-25 2012-02-28 The Directv Group, Inc. Passive system and method to equalize distortion in an RF satellite chain
US20110191401A1 (en) * 2010-01-31 2011-08-04 Freescale Semiconductor, Inc. Circuit and method for cholesky based data processing
US9825785B2 (en) * 2014-03-03 2017-11-21 Multiphy Ltd. Enhanced equalization based on a combination of reduced complexity MLSE and linear equalizer for heavily ISI-induced signals
CN107078978B (en) * 2014-12-26 2020-06-02 华为技术有限公司 Signal compensation method and device

Citations (1)

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WO2001071996A2 (en) * 2000-03-20 2001-09-27 Massachusetts Institute Of Technology Block-iterative decision feedback equalizer with error-conrol coding

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US6353629B1 (en) * 1997-05-12 2002-03-05 Texas Instruments Incorporated Poly-path time domain equalization
US6222592B1 (en) * 1998-01-13 2001-04-24 Samsung Electronics Co., Ltd. TV receiver equalizer storing channel characterizations for each TV channel between times of reception therefrom
US6151358A (en) * 1999-08-11 2000-11-21 Motorola, Inc. Method and apparatus, and computer program for producing filter coefficients for equalizers
US6590932B1 (en) * 1999-11-24 2003-07-08 Ericsson Inc. Methods, receiver devices and systems for whitening a signal disturbance in a communication signal
US6317467B1 (en) * 2000-06-14 2001-11-13 Lloyd C. Cox Beamforming and interference cancellation system using general purpose filter architecture

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WO2001071996A2 (en) * 2000-03-20 2001-09-27 Massachusetts Institute Of Technology Block-iterative decision feedback equalizer with error-conrol coding

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Also Published As

Publication number Publication date
US6775322B1 (en) 2004-08-10
EP1310070A2 (en) 2003-05-14
WO2002015505A2 (en) 2002-02-21
AU2001273500A1 (en) 2002-02-25

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