NO985029L - Forbedring av, eller med hensyn til, synkronisering - Google Patents

Forbedring av, eller med hensyn til, synkronisering

Info

Publication number
NO985029L
NO985029L NO985029A NO985029A NO985029L NO 985029 L NO985029 L NO 985029L NO 985029 A NO985029 A NO 985029A NO 985029 A NO985029 A NO 985029A NO 985029 L NO985029 L NO 985029L
Authority
NO
Norway
Prior art keywords
frame
synchronization
ofdm
receiver
frames
Prior art date
Application number
NO985029A
Other languages
English (en)
Other versions
NO985029D0 (no
Inventor
Lennart Olsson
Gunnar Bahlenberg
Daniel Bengtsson
Siwert Hokansson
Anders Isaksson
Lars-Ke Isaksson
Mikael Isaksson
Magnus Johansson
Mauritz Lahti
Lis-Marie Ljunggren
Hans Lundberg
M Tomas Nordstr
Sven-Rune Olofsson
Tomas Stefansson
Hans Iman
G Ran Ikvist
Original Assignee
Telia Ab
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 SE9700784A external-priority patent/SE9700784D0/xx
Application filed by Telia Ab filed Critical Telia Ab
Publication of NO985029D0 publication Critical patent/NO985029D0/no
Publication of NO985029L publication Critical patent/NO985029L/no

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
    • 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
    • H04L27/2657—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
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2672—Frequency domain
    • 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
    • H04L27/2676—Blind, i.e. without using known symbols
    • H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

I OFDM-system er frekvensdomenedata Fourier-trans- formeringen av de mottatte OFDM-rammene i tidsdomenet. Tidsdomenerammene må samples, ved mottakeren, i synkroni- sering med senderen, slik at hver mottatt ramme inneholder data fra kun en eneste sendt ramme. Det er absolutt nød- vendig at denne synkronisering opprettholdes for å opprett- holde ortogonaliteten for rammene. Et typisk mulitbærersystem av typen OFDM, som anvender et syklisk prefiks, tillater at ortogonalitet opprettholdes når det finnes et lite avvik fra eksakt rammesynkroniser- ing. Ettersom signalintervallet inkluderer både en hel ramme og et syklisk prefiks, som er en repetering av en del av rammen, vil en ramme som samples innen signalintervallet inneholde data fra kun en ramme. Ettersom signalintervallet er større enn rammeperioden, gir dette et visst spillerom med hensyn til rammeinnstilling. I multibærersystem av OFDM-typen anvendes ofte en adaptiv kanalutjevner som arbeider i frekvensdomenet. De interne parametrene i en slik utjevner inneholder, foruten informasjon om karakteristikk for kanalen, informasjon som kan tolkes som tidsawiket mellom samplingsklokkene for senderen og mottakeren. Den foreliggende oppfinnelse anvender denne informasjon for å styre samplingsklokken hos mottakeren på et mer robust vis enn det som tidligere har vært mulig med kjente teknikker. Den foreliggende oppfinnelse er spesielt anvendelig for anvendelse i ADSL- og VDSL-modem som kan anvendes for å gi bredbåndsaksess over nettverk av kopper. Oppfinnelsen er også relevant til bredbåndsoverføring i mobile og halv- mobile system for overføring på radiokanaler.
NO985029A 1997-03-03 1998-10-29 Forbedring av, eller med hensyn til, synkronisering NO985029L (no)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9700784A SE9700784D0 (sv) 1997-03-03 1997-03-03 Using adaptive equalizer parameters for sampling clock oscillator control in an OFDM system
SE9703629A SE9703629L (sv) 1997-03-03 1997-10-06 Förbättringar av, eller med avseende på, synkronisering
PCT/SE1998/000353 WO1998039872A2 (en) 1997-03-03 1998-02-27 Improvements in, or relating to synchronisation

Publications (2)

Publication Number Publication Date
NO985029D0 NO985029D0 (no) 1998-10-29
NO985029L true NO985029L (no) 1999-01-04

Family

ID=26662921

Family Applications (1)

Application Number Title Priority Date Filing Date
NO985029A NO985029L (no) 1997-03-03 1998-10-29 Forbedring av, eller med hensyn til, synkronisering

Country Status (7)

Country Link
US (1) US6751261B1 (no)
EP (1) EP0920758B1 (no)
DE (1) DE69810251D1 (no)
EE (1) EE9800374A (no)
NO (1) NO985029L (no)
SE (1) SE9703629L (no)
WO (1) WO1998039872A2 (no)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9801748L (sv) * 1998-05-18 1999-11-19 Telia Ab Förbättringar i eller som hänför sig till telekommunikationsöverföringssystem
US7952511B1 (en) 1999-04-07 2011-05-31 Geer James L Method and apparatus for the detection of objects using electromagnetic wave attenuation patterns
US6650617B1 (en) 2000-02-22 2003-11-18 Thomson Licensing S.A. Reduced complexity FFT window synchronization for an orthogonal frequency division multiplexing system
US6771591B1 (en) 2000-07-31 2004-08-03 Thomson Licensing S.A. Method and system for processing orthogonal frequency division multiplexed signals
US6947748B2 (en) 2000-12-15 2005-09-20 Adaptix, Inc. OFDMA with adaptive subcarrier-cluster configuration and selective loading
KR100476896B1 (ko) * 2002-05-22 2005-03-17 삼성전자주식회사 티씨엠-아이에스디엔 라인과 공존하는 디지털 가입자라인을 이용한 통신 시스템 및 그것의 프레임 동기화 방법
US7362802B2 (en) 2003-09-12 2008-04-22 Zarbana Digital Fund Llc Frequency domain equalizer for wireless commuications system
US7480234B1 (en) 2003-10-31 2009-01-20 Cisco Technology, Inc. Initial timing estimation in a wireless network receiver
US7573851B2 (en) 2004-12-07 2009-08-11 Adaptix, Inc. Method and system for switching antenna and channel assignments in broadband wireless networks
US7562151B2 (en) * 2005-11-30 2009-07-14 Microsoft Corporation Peer tunnels and peer group targets
US8103621B2 (en) * 2008-10-03 2012-01-24 International Business Machines Corporation HSM two-way orphan reconciliation for extremely large file systems
JP6115416B2 (ja) * 2013-09-06 2017-04-19 富士通株式会社 光送信器、光受信器、光伝送システム、光送信方法、光受信方法、および光伝送方法
US10104313B2 (en) 2016-07-08 2018-10-16 United Technologies Corporation Method for turbine component qualification

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9020170D0 (en) * 1990-09-14 1990-10-24 Indep Broadcasting Authority Orthogonal frequency division multiplexing
US5479447A (en) * 1993-05-03 1995-12-26 The Board Of Trustees Of The Leland Stanford, Junior University Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines
SE9302453L (sv) * 1993-07-20 1994-10-17 Telia Ab Förfarande och anordning för synkronisering i digitalt transmissionssystem av typen OFDM
JPH0746218A (ja) * 1993-07-28 1995-02-14 Sony Corp ディジタル復調装置
US5444697A (en) * 1993-08-11 1995-08-22 The University Of British Columbia Method and apparatus for frame synchronization in mobile OFDM data communication
SE501608C2 (sv) * 1994-01-18 1995-03-27 Telia Ab Förfarande och arrangemang för synkronisering vid OFDM- modulering
US5625651A (en) * 1994-06-02 1997-04-29 Amati Communications, Inc. Discrete multi-tone data transmission system using an overhead bus for synchronizing multiple remote units
SE514986C2 (sv) * 1995-03-01 2001-05-28 Telia Ab Metod och anordning för synkronisering vid OFDM-system
US5732113A (en) * 1996-06-20 1998-03-24 Stanford University Timing and frequency synchronization of OFDM signals
EP0931388B1 (en) * 1996-08-29 2003-11-05 Cisco Technology, Inc. Spatio-temporal processing for communication
US5953311A (en) * 1997-02-18 1999-09-14 Discovision Associates Timing synchronization in a receiver employing orthogonal frequency division multiplexing
US5909463A (en) * 1996-11-04 1999-06-01 Motorola, Inc. Single-chip software configurable transceiver for asymmetric communication system
US5966416A (en) * 1996-11-21 1999-10-12 Dsp Group, Inc. Verification of PN synchronization in a spread-spectrum communications receiver

Also Published As

Publication number Publication date
EE9800374A (et) 1999-04-15
EP0920758A2 (en) 1999-06-09
US6751261B1 (en) 2004-06-15
WO1998039872A2 (en) 1998-09-11
DE69810251D1 (de) 2003-01-30
NO985029D0 (no) 1998-10-29
SE9703629D0 (sv) 1997-10-06
SE9703629L (sv) 1998-09-04
EP0920758B1 (en) 2002-12-18
WO1998039872A3 (en) 2000-08-24

Similar Documents

Publication Publication Date Title
NO985029L (no) Forbedring av, eller med hensyn til, synkronisering
EP1689140A1 (en) Apparatus and method for compensating for a frequency offset in a wireless communication system
US20080112518A1 (en) Arrangement and method for reducing the impact of interfering signals in a communication system
NO20054011L (no) Posisjonstilpasset sikkerhetsintervall for OFDM-kommunikasjonssystem
WO2001099362A8 (en) Sliding-window processing for the reception of multicarrier signals
WO2005094028A1 (en) Periodic training signals
US20140072080A1 (en) Physical Layer Frame Format Design for Wideband Wireless Communications Systems
KR20070014583A (ko) Ｏｆｄｍ 시스템에 적용되는 위상잡음 보상장치 및 그 방법
CN110011779A (zh) 端口定时偏差补偿方法、系统和终端
US11909572B2 (en) Symbol generator and symbol generation method
NO985030L (no) Forbedring av, eller med hensyn til, synkronisering
US20040218521A1 (en) Method for data communication between a single-carrier system and a multi-carrier system
KR100626644B1 (ko) 직교 주파수 분할 다중화 통신시스템에서 주파수 및 시간옵셋 추정 방법과 그를 이용한 장치
EP1084546B1 (en) Improvements in, or relating to, telecommunications transmission systems
KR20010048447A (ko) Ｏｆｄｍ 시스템에서 ｃｙｃｌｉｃ ｓｕｆｆｉｘ를사용한 보호구간의 구현 방법 및 장치
SE9904171D0 (sv) Multi-Carrier transmission system
Kim et al. A new fast symbol timing recovery algorithm for OFDM systems
JP4440655B2 (ja) 直交波周波数分割多重システムの搬送波周波数オフセットと位相の補償装置及び方法
CA2433148A1 (en) Method and apparatus for estimating frequency offsets for an ofdm burst receiver
US7561560B2 (en) Symbol timing synchronization system for orthogonal frequency division multiplexing systems
JP3807996B2 (ja) 共有ディジタル加入者回線モデム中の回線ドライバ電力を制御するシステムおよび方法
KR100940870B1 (ko) 이동통신 시스템에서의 동기 확보 방법
KR20100071735A (ko) 샘플링 주파수 오프셋 추정 방법 및 이를 이용한 샘플링 주파수 오프셋 보상 방법
Elmaroud et al. Performance analysis of asynchronous and non linear FBMC systems
KR20040040125A (ko) 샘플링 클럭 복원을 위한 클럭 오차 검출장치 및 그방법과 그 장치를 포함하는 오에프디엠 수신기

Legal Events

Date Code Title Description
FC2A Withdrawal, rejection or dismissal of laid open patent application