BR0203545A - Método e aparelho para inicialização de derivação de equalizador seletivo em um sistema ofdm - Google Patents

Método e aparelho para inicialização de derivação de equalizador seletivo em um sistema ofdm

Info

Publication number
BR0203545A
BR0203545A BR0203545-6A BR0203545A BR0203545A BR 0203545 A BR0203545 A BR 0203545A BR 0203545 A BR0203545 A BR 0203545A BR 0203545 A BR0203545 A BR 0203545A
Authority
BR
Brazil
Prior art keywords
equalizer
initialization
lead
derivation
less
Prior art date
Application number
BR0203545-6A
Other languages
English (en)
Inventor
Maxim B Belotserkovsky
Louis Robert Litwin
Original Assignee
Thonson Licensing S A
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 Thonson Licensing S A filed Critical Thonson Licensing S A
Publication of BR0203545A publication Critical patent/BR0203545A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • 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
    • 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
    • H04L2025/03414—Multicarrier
    • 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
    • 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
    • H04L2025/03656—Initialisation
    • 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
    • H04L2025/03681—Control of adaptation
    • 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
    • H04L2025/03681—Control of adaptation
    • H04L2025/037—Detection of convergence state
    • 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
    • H04L2025/03726—Switching between algorithms
    • 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
    • H04L2025/03745—Timing of adaptation
    • H04L2025/03764—Timing of adaptation only during predefined intervals
    • H04L2025/0377—Timing of adaptation only during predefined intervals during the reception of training signals

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)

Abstract

"MéTODO E APARELHO PARA INICIALIZAçãO DE DERIVAçãO DE EQUALIZADOR SELETIVO EM UM SISTEMA OFDM". Trata-se de um método para inicializar um equalizador em um receptor com Multiplexação por Divisão de Freq³ência Ortogonal ("OFDM") que inclui inibir, baseado pelo menos em parte em (a) uma derivação do equalizador sendo menor do que um primeiro limite (240) e (b) um tempo entre os sinais OFDM sendo menor do que um segundo limite (270), uma inicialização da derivação. Em uma modalidade alternativa, um método inclui inicializar (260) as derivações de equalizador quando da partida, reinicializar (320) as derivações quando da passagem de um tempo predeterminado entre os sinais OFDM e seletivamente reinicializar (300, 340) pelo menos uma derivação quando da divergência da derivação. Em outra modalidade alternativa, um aparelho inclui um equalizador (72) e um controlador de inicialização de derivação (108) acoplado com o mesmo. o controlador de inicialização de derivação (108) está configurado para inibir, baseado pelo menos em parte em (a) uma derivação sendo menor do que um primeiro limite (240) e (b) um tempo entre os sinais OFDM sendo menor do que um segundo limite (270), uma inicialização da derivação.
BR0203545-6A 2001-09-19 2002-09-11 Método e aparelho para inicialização de derivação de equalizador seletivo em um sistema ofdm BR0203545A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/955,651 US20020021750A1 (en) 2000-05-12 2001-09-19 Method and apparatus for selective equalizer tap initialization in an OFDM system

Publications (1)

Publication Number Publication Date
BR0203545A true BR0203545A (pt) 2003-06-03

Family

ID=25497142

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0203545-6A BR0203545A (pt) 2001-09-19 2002-09-11 Método e aparelho para inicialização de derivação de equalizador seletivo em um sistema ofdm

Country Status (7)

Country Link
US (1) US20020021750A1 (pt)
EP (1) EP1303092A3 (pt)
JP (1) JP2003124908A (pt)
KR (1) KR20030025175A (pt)
CN (1) CN1409505A (pt)
BR (1) BR0203545A (pt)
MX (1) MXPA02009137A (pt)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020021750A1 (en) * 2000-05-12 2002-02-21 Belotserkovsky Maxim B. Method and apparatus for selective equalizer tap initialization in an OFDM system
US6753791B2 (en) * 2000-06-22 2004-06-22 Halliburton Energy Services, Inc. Burst QAM downhole telemetry system
US20030161415A1 (en) * 2002-02-26 2003-08-28 Eyal Krupka Iterative channel tracking
US7103098B2 (en) * 2002-03-15 2006-09-05 Intel Corporation Adaptive receiver for multiplex/multi-access communications
US7177354B2 (en) * 2003-04-22 2007-02-13 Zenith Electronics Corporation Method and apparatus for the control of a decision feedback equalizer
GB2406758B (en) * 2003-09-30 2006-04-19 Ubinetics Ltd Equalisation techniques
US7437135B2 (en) * 2003-10-30 2008-10-14 Interdigital Technology Corporation Joint channel equalizer interference canceller advanced receiver
US7400692B2 (en) * 2004-01-14 2008-07-15 Interdigital Technology Corporation Telescoping window based equalization
US7321550B2 (en) * 2004-02-17 2008-01-22 Industrial Technology Research Institute Method of equalization in an OFDM system
GB2439366A (en) * 2006-06-20 2007-12-27 Nec Technologies Resource block scheduling in communication networks
US7852914B2 (en) * 2006-12-20 2010-12-14 Broadcom Corporation Fade equalizer
US7738548B2 (en) * 2007-01-08 2010-06-15 Harris Corporation System and method for communicating at low signal-to-noise ratio using injected training symbols
MX2010004849A (es) * 2007-10-31 2010-05-27 Thomson Licensing Datos de inicializacion de sincronizacion para rafagas de tiempo en un sistema de comunicaciones moviles.
US8934526B2 (en) * 2010-06-28 2015-01-13 Miguel Marquina Improvements relating to equalizers
US9197455B2 (en) * 2011-08-12 2015-11-24 Tektronix, Inc. Two stage adaptive equalizer for a batch receiver
US8971463B2 (en) * 2011-11-18 2015-03-03 Vixs Systems, Inc. Channel estimation in a communications system
CN105247806B (zh) * 2013-05-16 2018-10-09 中兴通讯(美国)公司 传输和接收正交频分复用信号的方法和装置以及光通信系统

Family Cites Families (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914691A (en) * 1974-08-21 1975-10-21 Bell Telephone Labor Inc Repositioning of equalizer tap-gain coefficients
US3978407A (en) * 1975-07-23 1976-08-31 Codex Corporation Fast start-up adaptive equalizer communication system using two data transmission rates
JPS6047530A (ja) * 1983-08-26 1985-03-14 Nec Corp 選択性フェ−ディング保護方式
US4621366A (en) * 1984-02-22 1986-11-04 Universal Data Systems, Inc. Modem equalizer training using previously stored parameters
US4709374A (en) * 1984-07-05 1987-11-24 American Telephone And Telegraph Company Technique for decision-directed equalizer train/retrain
US5297165A (en) * 1990-07-06 1994-03-22 Nippon Telegraph And Telephone Corporation Equalizer for radio receive signal
JP2797153B2 (ja) * 1991-05-10 1998-09-17 松下電器産業株式会社 データ受信装置
JP2649766B2 (ja) * 1993-01-20 1997-09-03 国際電信電話株式会社 等化後選択合成ダイバーシチ受信方式
US5841484A (en) * 1994-02-10 1998-11-24 Philips Electronics North North America Corporation Blind equalizer method and apparatus for HDTY transmission using an NTSC rejection filter for mitigating co-channel interference
US5956624A (en) * 1994-07-12 1999-09-21 Usa Digital Radio Partners Lp Method and system for simultaneously broadcasting and receiving digital and analog signals
US5550862A (en) * 1994-08-01 1996-08-27 Rockwell International Corporation Method and apparatus for centering equalizer taps
FI943613A (fi) * 1994-08-03 1996-02-04 Nokia Technology Gmbh Menetelmä ja kanavakorjain digitaalisen signaalin taajuustasossa suoritettavaa kanavakorjausta varten
JPH08167867A (ja) * 1994-12-15 1996-06-25 Fujitsu Ltd 無線受信装置及び同無線受信装置における受信系切替制御方法
US5748677A (en) * 1996-01-16 1998-05-05 Kumar; Derek D. Reference signal communication method and system
TW349296B (en) * 1996-05-21 1999-01-01 Ibm Wireless communication apparatus, wireless communication method, and wireless communication system
US5949796A (en) * 1996-06-19 1999-09-07 Kumar; Derek D. In-band on-channel digital broadcasting method and system
US5694423A (en) * 1996-08-06 1997-12-02 Lucent Technologies Inc. Method and apparatus for detecting and correcting misconvergence of a blind equalizer
AU4238697A (en) * 1996-08-29 1998-03-19 Cisco Technology, Inc. Spatio-temporal processing for communication
ATE245324T1 (de) * 1996-09-02 2003-08-15 St Microelectronics Nv Verbesserungen bei, oder in bezug auf mehrträgerübertragungssysteme
JPH10106158A (ja) * 1996-09-30 1998-04-24 Toshiba Corp ディスク記憶装置及び同装置に適用する波形等化回路
EP1062444A4 (en) * 1996-10-22 2001-04-11 Kalsi Eng Inc IMPROVED FLEXIBLE OBLIQUE DISC VALVE
KR100226698B1 (ko) * 1996-12-28 1999-10-15 전주범 직교 주파수 분할 다중화 수신 시스템의 채널 등화 장치
US5999349A (en) * 1996-12-30 1999-12-07 Daewoo Electronics Co., Ltd. Waveform equalization apparatus
US6167082A (en) * 1997-03-06 2000-12-26 Level One Communications, Inc. Adaptive equalizers and methods for carrying out equalization with a precoded transmitter
US5835895A (en) * 1997-08-13 1998-11-10 Microsoft Corporation Infinite impulse response filter for 3D sound with tap delay line initialization
US6219378B1 (en) * 1997-09-17 2001-04-17 Texas Instruments Incorporated Digital subscriber line modem initialization
US6188722B1 (en) * 1998-04-29 2001-02-13 Nortel Networks Limited Sequential blind convergence process in an adaptive decision feedback equalizer
US5990738A (en) * 1998-06-19 1999-11-23 Datum Telegraphic Inc. Compensation system and methods for a linear power amplifier
US5990734A (en) * 1998-06-19 1999-11-23 Datum Telegraphic Inc. System and methods for stimulating and training a power amplifier during non-transmission events
DE69832483T2 (de) * 1998-08-19 2006-06-08 Siemens Ag Spreizspektrumempfänger zur Verminderung von Nachbarsymbolstörungen
US6141393A (en) * 1999-03-03 2000-10-31 Motorola, Inc. Method and device for channel estimation, equalization, and interference suppression
US6535552B1 (en) * 1999-05-19 2003-03-18 Motorola, Inc. Fast training of equalizers in discrete multi-tone (DMT) systems
US6765969B1 (en) * 1999-09-01 2004-07-20 Motorola, Inc. Method and device for multi-user channel estimation
FR2798542B1 (fr) * 1999-09-13 2002-01-18 France Telecom Recepteur a multiplexage par repartition en frequences orthogonales avec estimation iterative de canal et procede correspondant
US20020021750A1 (en) * 2000-05-12 2002-02-21 Belotserkovsky Maxim B. Method and apparatus for selective equalizer tap initialization in an OFDM system
US7023937B2 (en) * 2001-03-01 2006-04-04 Texas Instruments Incorporated Receiver window design for multicarrier communication systems
US6597733B2 (en) * 2001-03-05 2003-07-22 Ensemble Communications, Inc. Equalizer performance enhancements for broadband wireless applications
US7042937B2 (en) * 2001-04-23 2006-05-09 Koninklijke Philips Electronics N.V. Hybrid frequency-time domain equalizer

Also Published As

Publication number Publication date
KR20030025175A (ko) 2003-03-28
JP2003124908A (ja) 2003-04-25
MXPA02009137A (es) 2005-07-25
US20020021750A1 (en) 2002-02-21
EP1303092A3 (en) 2006-07-12
EP1303092A2 (en) 2003-04-16
CN1409505A (zh) 2003-04-09

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Legal Events

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B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 5A E 6A ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO PUBLICADO NA RPI 1980 DE 16/12/2008.