NO985029L - Forbedring av, eller med hensyn til, synkronisering - Google Patents
Forbedring av, eller med hensyn til, synkroniseringInfo
- 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
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)
- Data Exchanges In Wide-Area Networks (AREA)
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (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.
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)
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)
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 |
US6018556A (en) * | 1996-11-21 | 2000-01-25 | Dsp Group, Inc. | Programmable loop filter for carrier recovery in a radio receiver |
-
1997
- 1997-10-06 SE SE9703629A patent/SE9703629L/xx not_active Application Discontinuation
-
1998
- 1998-02-27 US US09/147,230 patent/US6751261B1/en not_active Expired - Lifetime
- 1998-02-27 EE EE9800374A patent/EE9800374A/xx unknown
- 1998-02-27 EP EP98908382A patent/EP0920758B1/en not_active Expired - Lifetime
- 1998-02-27 WO PCT/SE1998/000353 patent/WO1998039872A2/en active IP Right Grant
- 1998-02-27 DE DE69810251T patent/DE69810251D1/de not_active Expired - Lifetime
- 1998-10-29 NO NO985029A patent/NO985029L/no not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP0920758A2 (en) | 1999-06-09 |
WO1998039872A3 (en) | 2000-08-24 |
SE9703629D0 (sv) | 1997-10-06 |
EE9800374A (et) | 1999-04-15 |
EP0920758B1 (en) | 2002-12-18 |
WO1998039872A2 (en) | 1998-09-11 |
US6751261B1 (en) | 2004-06-15 |
SE9703629L (sv) | 1998-09-04 |
NO985029D0 (no) | 1998-10-29 |
DE69810251D1 (de) | 2003-01-30 |
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Legal Events
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FC2A | Withdrawal, rejection or dismissal of laid open patent application |