[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

ES2188370A1 - Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm. - Google Patents

Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm.

Info

Publication number
ES2188370A1
ES2188370A1 ES200101154A ES200101154A ES2188370A1 ES 2188370 A1 ES2188370 A1 ES 2188370A1 ES 200101154 A ES200101154 A ES 200101154A ES 200101154 A ES200101154 A ES 200101154A ES 2188370 A1 ES2188370 A1 ES 2188370A1
Authority
ES
Spain
Prior art keywords
synchronisation
point
users
ofdm modulation
downlink
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
ES200101154A
Other languages
English (en)
Other versions
ES2188370B1 (es
Inventor
Martin Juan Miguel Gavillero
Insua Juan Carlos Riveiro
Molinero Salvador Iranzo
Fouren Nils Hakan
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.)
MaxLinear Hispania SL
Original Assignee
Diseno de Sistemas en Silicio SA
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 to ES200101154A priority Critical patent/ES2188370B1/es
Application filed by Diseno de Sistemas en Silicio SA filed Critical Diseno de Sistemas en Silicio SA
Priority to EA200301161A priority patent/EA005669B1/ru
Priority to PT02732765T priority patent/PT1389835E/pt
Priority to BR0210055-0A priority patent/BR0210055A/pt
Priority to EP02732765A priority patent/EP1389835B1/en
Priority to CA002448106A priority patent/CA2448106A1/en
Priority to CNA028141598A priority patent/CN1528059A/zh
Priority to ES02732765T priority patent/ES2296929T3/es
Priority to AT02732765T priority patent/ATE377870T1/de
Priority to MXPA03010658A priority patent/MXPA03010658A/es
Priority to IL15875802A priority patent/IL158758A0/xx
Priority to PCT/ES2002/000234 priority patent/WO2002095976A1/es
Priority to DE60223356T priority patent/DE60223356T2/de
Priority to KR1020037015198A priority patent/KR100768835B1/ko
Priority to JP2002592319A priority patent/JP4044445B2/ja
Priority to AU2002304581A priority patent/AU2002304581B2/en
Publication of ES2188370A1 publication Critical patent/ES2188370A1/es
Priority to US10/718,143 priority patent/US7423959B2/en
Application granted granted Critical
Publication of ES2188370B1 publication Critical patent/ES2188370B1/es
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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • 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
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Radio Transmission System (AREA)

Abstract

Procedimiento para la sincronización en el enlace descendente de múltiples usuarios en un sistema de transmisión punto a multipunto con modulación OFDM. Aplicable en la comunicación bidireccional a través de la red eléctrica entre una cabecera y una pluralidad de usuarios y permite la sincronización tanto en tiempo como en frecuencia de los múltiples usuarios en un sistema de comunicación multiportadora OFDM (multiplexación por división ortogonal en frecuencia). Se caracteriza, porque comprende generar secuencias de sincronismo mediante dos símbolos de sincronismo idénticos (16), que se transmiten periódicamente desde el equipo de cabecera por el enlace descendente a los usuarios, para estimar y corregir la frecuencia de muestreo y simultáneamente estimar el momento en que comienza cada símbolo OFDM.
ES200101154A 2001-05-21 2001-05-21 Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm. Expired - Fee Related ES2188370B1 (es)

Priority Applications (17)

Application Number Priority Date Filing Date Title
ES200101154A ES2188370B1 (es) 2001-05-21 2001-05-21 Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm.
DE60223356T DE60223356T2 (de) 2001-05-21 2002-05-17 Verfahren zur downlink synchronisation für ein punkt-zu-mehrpunkt-system mit ofdm-modulation
BR0210055-0A BR0210055A (pt) 2001-05-21 2002-05-17 Processo para sincronização no fluxo descendente de múltiplos usuários em um sistema ponto a multiponto com modulação ofdm
EP02732765A EP1389835B1 (en) 2001-05-21 2002-05-17 Downlink synchronisation method for a point-to-multipoint system with ofdm modulation
CA002448106A CA2448106A1 (en) 2001-05-21 2002-05-17 Process for synchronization in the downstream of multiple users in a point to multipoint system with ofdm modulation
CNA028141598A CN1528059A (zh) 2001-05-21 2002-05-17 在采用正交频分复用调制的点到多点系统中多个用户的下行流中实现同步的方法
ES02732765T ES2296929T3 (es) 2001-05-21 2002-05-17 Procedimiento par ala sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto amultipunto con modulacion ofdm.
AT02732765T ATE377870T1 (de) 2001-05-21 2002-05-17 Verfahren zur downlink synchronisation für ein punkt-zu-mehrpunkt-system mit ofdm-modulation
EA200301161A EA005669B1 (ru) 2001-05-21 2002-05-17 Способ синхронизации передачи данных множеству пользователей в нисходящем канале многоточечной системы передачи данных с использованием очу-модуляции
IL15875802A IL158758A0 (en) 2001-05-21 2002-05-17 Process for synchronization in the downstream of multiple users in a point to multipoint system with ofdm modulation
PCT/ES2002/000234 WO2002095976A1 (es) 2001-05-21 2002-05-17 Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm
PT02732765T PT1389835E (pt) 2001-05-21 2002-05-17 Processo de sincronização descendente para um sistema ponto amultiponto com modulação ofdm
KR1020037015198A KR100768835B1 (ko) 2001-05-21 2002-05-17 Ｏｆｄｍ 변조에 의한 포인트 투 멀티포인트 시스템에 있어서의 다중 유저의 하향에서의 동기화 방법
JP2002592319A JP4044445B2 (ja) 2001-05-21 2002-05-17 Ｏｆｄｍ変調を用いて１対多ポイントシステムにおける複数ユーザーの下流における同期の方法
AU2002304581A AU2002304581B2 (en) 2001-05-21 2002-05-17 Downlink synchronisation method for a point-to-multipoint system with OFDM modulation
MXPA03010658A MXPA03010658A (es) 2001-05-21 2002-05-17 Procedimiento paraq la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto multipunto con modulacion ofd.
US10/718,143 US7423959B2 (en) 2001-05-21 2003-11-20 Process for synchronization in the downstream of multiple users in a point multipoint system with OFDM modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200101154A ES2188370B1 (es) 2001-05-21 2001-05-21 Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm.

Publications (2)

Publication Number Publication Date
ES2188370A1 true ES2188370A1 (es) 2003-06-16
ES2188370B1 ES2188370B1 (es) 2004-10-16

Family

ID=8497781

Family Applications (2)

Application Number Title Priority Date Filing Date
ES200101154A Expired - Fee Related ES2188370B1 (es) 2001-05-21 2001-05-21 Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm.
ES02732765T Expired - Lifetime ES2296929T3 (es) 2001-05-21 2002-05-17 Procedimiento par ala sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto amultipunto con modulacion ofdm.

Family Applications After (1)

Application Number Title Priority Date Filing Date
ES02732765T Expired - Lifetime ES2296929T3 (es) 2001-05-21 2002-05-17 Procedimiento par ala sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto amultipunto con modulacion ofdm.

Country Status (16)

Country Link
US (1) US7423959B2 (es)
EP (1) EP1389835B1 (es)
JP (1) JP4044445B2 (es)
KR (1) KR100768835B1 (es)
CN (1) CN1528059A (es)
AT (1) ATE377870T1 (es)
AU (1) AU2002304581B2 (es)
BR (1) BR0210055A (es)
CA (1) CA2448106A1 (es)
DE (1) DE60223356T2 (es)
EA (1) EA005669B1 (es)
ES (2) ES2188370B1 (es)
IL (1) IL158758A0 (es)
MX (1) MXPA03010658A (es)
PT (1) PT1389835E (es)
WO (1) WO2002095976A1 (es)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2212744B2 (es) * 2003-01-10 2005-03-16 Diseño De Sistemas En Silicio, S.A. Procedimiento de sincronizacion en el dominio del tiempo y de la frecuencia de multiples equipos en un sistema de transmision con modulacion ofdm.
ES2221570B2 (es) * 2003-05-30 2005-10-01 Diseño De Sistemas En Silicio, S.A. Procedimiento de remuestreo en transmision y recepcion de una señal digital con traslacion en banda digital.
US7058378B2 (en) * 2003-11-18 2006-06-06 Interdigital Technology Corporation Method and apparatus for automatic frequency correction of a local oscilator with an error signal derived from an angle value of the conjugate product and sum of block correlator outputs
JP4290048B2 (ja) * 2004-03-23 2009-07-01 三洋電機株式会社 受信方法および装置
JP2008500788A (ja) * 2004-05-21 2008-01-10 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 帯域幅拡張に低複雑性ｃｄｍａ層を使用する超広域帯ｏｆｄｍ信号の送受信機
KR101065687B1 (ko) * 2004-06-10 2011-09-19 엘지전자 주식회사 Ｏｆｄｍ 무선 통신 시스템에 적용되는 시간 동기 획득 방법
US7421013B1 (en) * 2004-08-02 2008-09-02 Marvell International Ltd. Maximum likelihood estimation of time and frequency offset for OFDM systems
EP1779570B1 (en) * 2004-08-17 2016-11-09 LG Electronics Inc. Method for detecting ofdm symbol timing in ofdm system
KR100587310B1 (ko) * 2004-08-18 2006-06-08 엘지전자 주식회사 주파수 동기 장치 및 이를 적용한 ｄｖｂ-ｈ 수신 시스템
CN100479445C (zh) * 2005-01-28 2009-04-15 北京大学 使用了前后缀信号的正交频分复用通信方法
US7778336B1 (en) 2005-02-09 2010-08-17 Marvell International Ltd. Timing and frequency synchronization of OFDM signals for changing channel conditions
JP4440831B2 (ja) * 2005-06-14 2010-03-24 株式会社エヌ・ティ・ティ・ドコモ 基地局装置、送信方法及び通信システム
US8315191B2 (en) * 2005-09-20 2012-11-20 Qualcomm Incorporated Timing acquisition and mode and guard detection for an OFDM transmission
US7894417B2 (en) * 2005-11-01 2011-02-22 Nokia Corporation Signal arrangement for multi-bandwidth OFDM system
US8130629B2 (en) * 2005-11-25 2012-03-06 Go Net Systems Ltd Simultaneous simulcast and single cast hybrid multi-tone communication system
US7512113B2 (en) * 2005-12-21 2009-03-31 Motorola, Inc. Method and system for determining a minimum time of flight of a radio frequency transmission
US7769119B2 (en) 2006-09-27 2010-08-03 Sandbridge Technologies, Inc. Method of initial synchronization of a communication signal
CN100562001C (zh) * 2007-05-30 2009-11-18 北京中星微电子有限公司 确定正交频分复用系统导频位置的方法、装置及解调设备
CN101374129B (zh) * 2007-08-20 2012-01-11 中兴通讯股份有限公司 基于正交频分复用的同步序列生成方法、同步方法及系统
EP2079212A1 (en) * 2008-01-11 2009-07-15 Sandbridge Technologies, Inc. A method of initial synchronization of a communication signal
US9112598B2 (en) * 2008-01-30 2015-08-18 Telefonaktiebolaget L M Ericsson (Publ) Report mechanism in a radio system reusing one time-slot
WO2009096841A1 (en) * 2008-01-30 2009-08-06 Telefonaktiebolaget L M Ericsson (Publ) A receiver for muros adapted to estimate symbol constellation using training sequences from two sub-channels
WO2009096832A1 (en) * 2008-01-30 2009-08-06 Telefonaktiebolaget Lm Ericsson (Publ) Timeslot sharing using unbalanced qpsk modulation
WO2009096842A1 (en) * 2008-01-30 2009-08-06 Telefonaktiebolaget L M Ericsson (Publ) A method of data modulation adapted to selected modulation rotational angle
US8509208B2 (en) 2008-02-01 2013-08-13 Qualcomm Incorporated Frequency error estimation
CN101888354B (zh) * 2009-05-15 2013-06-05 中兴通讯股份有限公司 一种信道估计方法及装置
JP5237214B2 (ja) * 2009-07-15 2013-07-17 株式会社日立製作所 送信装置、受信装置、または無線通信の処理方法
US8625689B2 (en) * 2010-07-09 2014-01-07 Texas Instruments Incorporated Time-domain link adaptation
US8548096B2 (en) * 2010-12-31 2013-10-01 Telefonaktiebolaget L M Ericsson (Publ) Controllable frequency offset for inphase and Quadrature (IQ) imbalance estimation
CN103236914B (zh) * 2013-04-16 2016-02-03 深圳市力合微电子股份有限公司 一种电力线载波通信系统的同步信号生成方法及装置
CN103580718B (zh) * 2013-10-15 2015-06-10 北京航天科工世纪卫星科技有限公司 一种低信噪比下的快速时频同步方法
JP6262849B2 (ja) 2014-09-23 2018-01-17 ホアウェイ・テクノロジーズ・カンパニー・リミテッド 送信機、受信機、および同期信号を送信／受信するための方法
US9559815B1 (en) * 2015-08-26 2017-01-31 Friskydsp Technology Ltd. Generation of OFDM symbols
US11051263B2 (en) * 2017-06-15 2021-06-29 Qualcomm Incorporated Synchronization channel and system acquisition for internet of things communications in a shared spectrum
ES2895680T3 (es) 2017-11-07 2022-02-22 Siemens Ag Procedimiento para la sincronización de unidades emisoras y receptoras en una transmisión de señales multiportadora
JP6559763B2 (ja) * 2017-12-14 2019-08-14 ホアウェイ・テクノロジーズ・カンパニー・リミテッド 送信機、受信機、および同期信号を送信／受信するための方法
CN111970063B (zh) * 2020-08-26 2022-04-29 北京字节跳动网络技术有限公司 一种通信方法、装置、设备和存储介质

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1075103A1 (en) * 1999-02-19 2001-02-07 Mitsubishi Denki Kabushiki Kaisha Communication device and communication method
WO2001028146A1 (en) * 1999-10-12 2001-04-19 Itran Communications Ltd. Apparatus for and method of adaptive synchronization in a spread spectrum communications receiver

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2774961B2 (ja) 1996-03-29 1998-07-09 株式会社次世代デジタルテレビジョン放送システム研究所 Ｏｆｄｍ復調装置
US5732113A (en) * 1996-06-20 1998-03-24 Stanford University Timing and frequency synchronization of OFDM signals
US6519291B1 (en) * 1998-02-03 2003-02-11 Lucent Technologies Inc. Reduction of interference in discrete multi-tone (DMT) based communications systems
US6876675B1 (en) * 1998-02-06 2005-04-05 Cisco Technology, Inc. Synchronization in OFDM systems
JP3606761B2 (ja) * 1998-11-26 2005-01-05 松下電器産業株式会社 Ｏｆｄｍ受信装置
KR100335443B1 (ko) 1999-06-15 2002-05-04 윤종용 직교주파수분할다중변조 신호의 심볼 타이밍 및 주파수 동기 장치 및 방법
US6985432B1 (en) * 2000-01-28 2006-01-10 Zion Hadad OFDM communication channel
JP2001111518A (ja) * 1999-10-04 2001-04-20 Mitsubishi Electric Corp 通信方法および通信装置
US6526295B1 (en) 1999-10-14 2003-02-25 Ericsson Inc. Power conservation method in mobile communications device
US6628735B1 (en) * 1999-12-22 2003-09-30 Thomson Licensing S.A. Correction of a sampling frequency offset in an orthogonal frequency division multiplexing system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1075103A1 (en) * 1999-02-19 2001-02-07 Mitsubishi Denki Kabushiki Kaisha Communication device and communication method
WO2001028146A1 (en) * 1999-10-12 2001-04-19 Itran Communications Ltd. Apparatus for and method of adaptive synchronization in a spread spectrum communications receiver

Also Published As

Publication number Publication date
US7423959B2 (en) 2008-09-09
EP1389835A1 (en) 2004-02-18
ES2296929T3 (es) 2008-05-01
WO2002095976A1 (es) 2002-11-28
KR100768835B1 (ko) 2007-10-19
MXPA03010658A (es) 2004-03-02
JP4044445B2 (ja) 2008-02-06
KR20040008186A (ko) 2004-01-28
CA2448106A1 (en) 2002-11-28
ATE377870T1 (de) 2007-11-15
EA005669B1 (ru) 2005-04-28
JP2004533768A (ja) 2004-11-04
DE60223356T2 (de) 2008-08-28
BR0210055A (pt) 2004-08-17
PT1389835E (pt) 2008-02-14
EP1389835B1 (en) 2007-11-07
DE60223356D1 (de) 2007-12-20
EA200301161A1 (ru) 2004-08-26
AU2002304581B2 (en) 2008-01-03
ES2188370B1 (es) 2004-10-16
US20040114551A1 (en) 2004-06-17
CN1528059A (zh) 2004-09-08
IL158758A0 (en) 2004-05-12

Similar Documents

Publication Publication Date Title
ES2188370A1 (es) Procedimiento para la sincronizacion en el enlace descendente de multiples usuarios en un sistema de transmision punto a multipunto con modulacion ofdm.
AU2001280362A1 (en) Cyclic delay diversity for mitigating isi in ofdm systems
CA2335225A1 (en) Multi-carrier cdma radio transmitting method and apparatus, and channel estimation method and apparatus for multi-carrier cdma radio transmitting system
KR100904533B1 (ko) 전송 타이밍 조절 방법, 연속적인 패킷 전송 방법 및 이동통신 단말
WO2007130011A8 (en) Method and system for processing reference signals in ofdm systems using transmission time interval groupings
EP1313283A3 (en) Timing synchronization for OFDM-based wireless networks
MY143990A (en) Method and apparatus for communication in a system employing differing transmission protocols
ES2184587A1 (es) Sistema y procedimiento de transmision digital de datos punto a multipunto sobre red electrica.
CA2362418A1 (en) Multi-carrier cdma transmission system signal format
KR20000071516A (ko) 전기 통신 수신기에서의 위상 및 주파수 오프셋 보상
RU2006117767A (ru) Локальные и глобальные передачи в беспроводных широковещательных сетях
CN101005470A (zh) 通信系统中的同步导频序列生成系统和方法
EP2237440A3 (en) Method and apparatus for measuring channel state information
KR20090113893A (ko) 서브캐리어 간격 식별
CN106797264A (zh) 灵活的正交频分复用phy传输数据帧前导码的动态配置
SE9700308D0 (sv) Förfarande och anordning i ett kommunikationssystem
KR20010099727A (ko) 다중 반송파 데이터 심볼의 의사 무작위 시퀀스를생성하는 방법과 관련 송신기 및 수신기
WO2005013522A3 (en) Method and apparatus providing adaptive learning in an adaptive orthogonal frequency division multiplex communication system
MXPA03010657A (es) Procedimeinto para la sincronizacion de la comunicacion mediante modulacion ofd de multiples equipos de usuario con un equipo de cabecera (canal ascendente).
TWI256790B (en) Process of synchronization in the time and frequency domain of multiple modems in a transmission system with OFDM modulation
KR20080085321A (ko) 직교 주파수 분할 다중화 접속 시스템의 채널 상황에 따른적응적 전송 장치 및 방법
WO2020243736A3 (en) Methods and apparatus for feedback in sidelink communications
KR20050002225A (ko) 직교 주파수 분할 다중 접속 시스템에서의 셀 탐색 방법
KR100911829B1 (ko) Ｏｆｄｍ-ｔｄｄ 시스템에서의 싸이클릭 프리픽스 설정장치 및 방법
EP0872985A3 (en) Symbol synchronisation in multicarrier receivers

Legal Events

Date Code Title Description
EC2A Search report published

Date of ref document: 20030616

Kind code of ref document: A1

FG2A Definitive protection

Ref document number: 2188370B1

Country of ref document: ES

FD1A Patent lapsed

Effective date: 20101018

PC2A Transfer of patent

Owner name: MARVELL HISPANIA, S.L. (SOCIEDAD UNIPERSONAL)

Effective date: 20110519