DE69128252T2 - Empfang von orthogonalen frequenzmultiplexsignalen - Google Patents

Empfang von orthogonalen frequenzmultiplexsignalen

Info

Publication number
DE69128252T2
DE69128252T2 DE69128252T DE69128252T DE69128252T2 DE 69128252 T2 DE69128252 T2 DE 69128252T2 DE 69128252 T DE69128252 T DE 69128252T DE 69128252 T DE69128252 T DE 69128252T DE 69128252 T2 DE69128252 T2 DE 69128252T2
Authority
DE
Germany
Prior art keywords
samples
demodulated
pct
values
complex
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.)
Expired - Fee Related
Application number
DE69128252T
Other languages
English (en)
Other versions
DE69128252D1 (de
Inventor
Jeffrey John Gledhill
Santosh Vasudev Anikhindi
Peter Anthony Avon
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.)
Digi Media Vision Ltd
Original Assignee
Digi Media Vision Ltd
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 Digi Media Vision Ltd filed Critical Digi Media Vision Ltd
Publication of DE69128252D1 publication Critical patent/DE69128252D1/de
Application granted granted Critical
Publication of DE69128252T2 publication Critical patent/DE69128252T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • 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
    • 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
    • H04L27/2676—Blind, i.e. without using known symbols
    • H04L27/2679—Decision-aided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/0803—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division using frequency interleaving, e.g. with precision offset

Landscapes

  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Radio Relay Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Radio Transmission System (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Control Of Electric Motors In General (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Noise Elimination (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Optical Communication System (AREA)
DE69128252T 1990-09-14 1991-09-13 Empfang von orthogonalen frequenzmultiplexsignalen Expired - Fee Related DE69128252T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909020170A GB9020170D0 (en) 1990-09-14 1990-09-14 Orthogonal frequency division multiplexing
PCT/GB1991/001571 WO1992005646A1 (en) 1990-09-14 1991-09-13 Reception of orthogonal frequency division multiplexed signals

Publications (2)

Publication Number Publication Date
DE69128252D1 DE69128252D1 (de) 1998-01-02
DE69128252T2 true DE69128252T2 (de) 1998-05-20

Family

ID=10682242

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69128252T Expired - Fee Related DE69128252T2 (de) 1990-09-14 1991-09-13 Empfang von orthogonalen frequenzmultiplexsignalen

Country Status (12)

Country Link
US (1) US5345440A (de)
EP (1) EP0548205B1 (de)
JP (1) JPH06501357A (de)
KR (1) KR100199467B1 (de)
AT (1) ATE160475T1 (de)
AU (1) AU646298B2 (de)
CA (1) CA2085728A1 (de)
DE (1) DE69128252T2 (de)
FI (1) FI931017A0 (de)
GB (1) GB9020170D0 (de)
HK (1) HK1004359A1 (de)
WO (1) WO1992005646A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10039902A1 (de) * 2000-08-16 2003-07-03 Rohde & Schwarz Verfahren zur Frequenz- und Zeit-Synchronisation eines Empfängers
DE10217879A1 (de) * 2002-04-22 2003-11-13 Ingbuero Ludwig Schaeffler Verfahren und Vorrichtung zum Aufteilen eines vorgegebenen Frequenzbandes, Verfahren und Vorrichtung zur Kanalmodulation, Verfahren und Vorrichtung zur Kanaldemodulation
DE10112773B4 (de) * 2001-03-16 2012-09-20 Rohde & Schwarz Gmbh & Co Kg Verfahren zur Frequenz- und Zeit-Synchronisation eines OFDM-Empfängers

Families Citing this family (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE37802E1 (en) 1992-03-31 2002-07-23 Wi-Lan Inc. Multicode direct sequence spread spectrum
FR2693861A1 (fr) * 1992-07-16 1994-01-21 Philips Electronique Lab Récepteur de signaux à répartition multiplexée de fréquences orthogonales muni d'un dispositif de synchronisation de fréquences.
US5376894A (en) * 1992-12-31 1994-12-27 Pacific Communication Sciences, Inc. Phase estimation and synchronization using a PSK demodulator
FR2701178A1 (fr) * 1993-02-03 1994-08-05 Philips Electronique Lab Système de communication par étalement de spectre à multiutilisateurs.
GB2278257B (en) * 1993-05-05 1996-10-02 British Broadcasting Corp Receiving equipment for digital transmissions
SE500986C2 (sv) * 1993-07-20 1994-10-17 Telia Ab Förfarande och anordning för synkronisering i digitalt transmissionssystem av typen OFDM
JPH0746217A (ja) * 1993-07-26 1995-02-14 Sony Corp ディジタル復調装置
US5675572A (en) * 1993-07-28 1997-10-07 Sony Corporation Orthogonal frequency division multiplex modulation apparatus and orthogonal frequency division multiplex demodulation apparatus
JP3041175B2 (ja) * 1993-11-12 2000-05-15 株式会社東芝 Ｏｆｄｍ同期復調回路
SG44884A1 (en) * 1993-12-03 1997-12-19 Koninkl Philips Electronics Nv A digital communication system and a receiver for use in such a system
DE4341211C1 (de) * 1993-12-03 1995-04-20 Grundig Emv Verfahren und Schaltungsanordnung zum Einfügen von Daten in ein Übertragungssignal
SE501608C2 (sv) * 1994-01-18 1995-03-27 Telia Ab Förfarande och arrangemang för synkronisering vid OFDM- modulering
WO1995020848A1 (en) * 1994-01-28 1995-08-03 Philips Electronics N.V. Digital transmission system
US5657313A (en) * 1994-05-09 1997-08-12 Victor Company Of Japan, Ltd. Signal transmitting apparatus and signal receiving apparatus using orthogonal frequency division multiplexing
EP0982908B1 (de) * 1994-05-09 2005-03-09 Victor Company Of Japan, Limited Einstellung eines Referenzunterträgers bei Mehrträgerübertragung
JP2731722B2 (ja) * 1994-05-26 1998-03-25 日本電気株式会社 クロック周波数自動制御方式及びそれに用いる送信装置と受信装置
US5627863A (en) * 1994-07-15 1997-05-06 Amati Communications Corporation Frame synchronization in multicarrier transmission systems
GB9418514D0 (en) * 1994-09-14 1994-11-02 At & T Global Inf Solution Information transmission system
US6334219B1 (en) 1994-09-26 2001-12-25 Adc Telecommunications Inc. Channel selection for a hybrid fiber coax network
US6282683B1 (en) * 1994-09-26 2001-08-28 Adc Telecommunications, Inc. Communication system with multicarrier telephony transport
DE4441566A1 (de) * 1994-11-23 1996-05-30 Bosch Gmbh Robert Verfahren zur digitalen Frequenzkorrektur bei Mehrträgerübertragungsverfahren
SE504787C2 (sv) * 1994-12-14 1997-04-28 Hd Divine Ab Metod vid OFDM-mottagning för korrigering av frekvens, tidsfönster, samplingsklocka och långsamma fasvariationer
US5682376A (en) * 1994-12-20 1997-10-28 Matsushita Electric Industrial Co., Ltd. Method of transmitting orthogonal frequency division multiplex signal, and transmitter and receiver employed therefor
US7280564B1 (en) 1995-02-06 2007-10-09 Adc Telecommunications, Inc. Synchronization techniques in multipoint-to-point communication using orthgonal frequency division multiplexing
USRE42236E1 (en) 1995-02-06 2011-03-22 Adc Telecommunications, Inc. Multiuse subcarriers in multipoint-to-point communication using orthogonal frequency division multiplexing
SE514986C2 (sv) * 1995-03-01 2001-05-28 Telia Ab Metod och anordning för synkronisering vid OFDM-system
US5537398A (en) * 1995-05-12 1996-07-16 Motorola, Inc. Apparatus for multi-rate simulcast communications
JP3079950B2 (ja) * 1995-06-20 2000-08-21 松下電器産業株式会社 直交周波数分割多重変調信号の受信装置及び伝送方法
US5726978A (en) * 1995-06-22 1998-03-10 Telefonaktiebolaget L M Ericsson Publ. Adaptive channel allocation in a frequency division multiplexed system
FI99252C (fi) * 1995-07-03 1997-12-29 Nokia Mobile Phones Ltd Yhdistetty radiosignaalin modulointi- ja monikäyttömenetelmä
US5790516A (en) * 1995-07-14 1998-08-04 Telefonaktiebolaget Lm Ericsson Pulse shaping for data transmission in an orthogonal frequency division multiplexed system
WO1997007620A1 (en) * 1995-08-16 1997-02-27 Philips Electronics N.V. Transmission system with improved symbol processing
JPH09130362A (ja) * 1995-10-30 1997-05-16 Sony Corp 受信装置および受信方法
JP2803614B2 (ja) * 1995-12-22 1998-09-24 日本電気株式会社 移動中継装置
DE69711957T2 (de) * 1996-02-02 2002-09-19 Thomson Brandt Gmbh Verfahren und Einrichtung zum Empfang von Mehrträgersignalen
WO1997041672A1 (en) * 1996-04-29 1997-11-06 Philips Electronics N.V. Symbol synchronisation in a multicarrier receiver
SE518137C2 (sv) * 1996-06-18 2002-09-03 Telia Ab Pulsformning och utjämning i multipelsystem med ortogonal frekvensindelning
CA2183140C (en) * 1996-08-12 2001-11-20 Grant Mcgibney Ofdm timing and frequency recovery system
US6192068B1 (en) 1996-10-03 2001-02-20 Wi-Lan Inc. Multicode spread spectrum communications system
KR100238047B1 (ko) * 1997-02-25 2000-01-15 윤종용 직교 주파수분할 다중화 전송시스템의 반송파 주파수 동기 방법 및 동기 장치
SE9703629L (sv) * 1997-03-03 1998-09-04 Telia Ab Förbättringar av, eller med avseende på, synkronisering
GB9707517D0 (en) * 1997-04-14 1997-06-04 Nds Ltd Improvements in or relating to receiver synchronisation
JPH10308717A (ja) * 1997-05-02 1998-11-17 Sony Corp 受信装置および受信方法
JP3568180B2 (ja) 1997-06-12 2004-09-22 株式会社日立国際電気 データ伝送装置
US6151296A (en) * 1997-06-19 2000-11-21 Qualcomm Incorporated Bit interleaving for orthogonal frequency division multiplexing in the transmission of digital signals
US6064692A (en) * 1997-06-20 2000-05-16 Amati Communications Corporation Protocol for transceiver initialization
DE19738780A1 (de) * 1997-09-04 1999-03-11 Thomson Brandt Gmbh Verfahren und Schaltungsanordnung zur Korrektur von Phasen- und/oder Frequenzfehlern digitaler Multicarrier-Signale
US6546055B1 (en) 1998-01-12 2003-04-08 The Board Of Trustees Of The Leland Stanford Junior University Carrier offset determination for RF signals having a cyclic prefix
US6151295A (en) * 1998-02-26 2000-11-21 Wavesat Telecom Inc. OFDM receiving system
WO1999053664A1 (en) * 1998-04-14 1999-10-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Differential coding and carrier recovery for multicarrier systems
BR9815808B1 (pt) 1998-04-14 2012-10-30 método e aparelho para a sincronização de freqüência fina em sistemas de demodulação multi-portadora.
IT1305147B1 (it) * 1998-10-30 2001-04-10 Sisvel Spa Metodo per la sincronizzazione di sistemi di tramissione e ricezionea portanti multiple ed apparecchio utilizzante il suddetto metodo.
DE69942222D1 (de) 1999-02-11 2010-05-20 Motorola Inc Schätzung von Träger- und Abtastungsfrequenzverschiebungen in Mehrträgerempfängern
US6539063B1 (en) 1999-02-18 2003-03-25 Ibiquity Digital Corporation System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system
US6768714B1 (en) 1999-06-23 2004-07-27 At&T Wireless Services, Inc. Methods and apparatus for use in obtaining frequency synchronization in an OFDM communication system
US6700866B1 (en) 1999-06-23 2004-03-02 At&T Wireless Services, Inc. Methods and apparatus for use in obtaining frequency synchronization in an OFDM communication system
US6505037B1 (en) * 1999-06-29 2003-01-07 Sharp Laboratories Of America, Inc. Data unit detection including antenna diversity
US6859504B1 (en) 1999-06-29 2005-02-22 Sharp Laboratories Of America, Inc. Rapid settling automatic gain control with minimal signal distortion
JP3715141B2 (ja) * 1999-07-13 2005-11-09 松下電器産業株式会社 通信端末装置
US6441601B1 (en) * 1999-11-12 2002-08-27 Itt Manufacturing Enterprises, Inc. Phase meter using a permuter
US6452377B1 (en) * 1999-11-12 2002-09-17 Itt Manufacturing Enterprises, Inc. Phase meter using a permuter and matched filter
US20020065047A1 (en) * 2000-11-30 2002-05-30 Moose Paul H. Synchronization, channel estimation and pilot tone tracking system
US6778622B2 (en) 2000-12-18 2004-08-17 Schlumberger Technology Corporation Estimating timing error in samples of a discrete multitone modulated signal
US20020160737A1 (en) * 2001-03-06 2002-10-31 Magis Networks, Inc. Method and apparatus for diversity antenna branch selection
US7346135B1 (en) 2002-02-13 2008-03-18 Marvell International, Ltd. Compensation for residual frequency offset, phase noise and sampling phase offset in wireless networks
US7577122B1 (en) * 2002-06-18 2009-08-18 Richard Douglas Schultz Method for minimizing receive packet processing for a personal computer implementation of a wireless local area network adapter
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.
US7218693B2 (en) * 2003-05-08 2007-05-15 Texas Instruments Incorporated Method and apparatus for channel estimation in a packet based transmission system having reduced complexity
CN1330193C (zh) * 2003-11-20 2007-08-01 中兴通讯股份有限公司 一种用于差分偏移四相键控解调器的位同步装置
US7778361B1 (en) * 2005-08-17 2010-08-17 Texas Instruments Incorporated Feed forward method for NICAM decode
GB2434725B (en) * 2006-01-26 2008-06-04 Toshiba Res Europ Ltd Methods for data transmission
WO2011025198A2 (ko) 2009-08-25 2011-03-03 한국전자통신연구원 무선 통신을 위한 프레임 생성/전송 방법 및 장치, 무선 통신을 위한 동기 추정 방법
KR20230144702A (ko) 2022-04-07 2023-10-17 주식회사 현대에버다임 미분무 소화 시스템

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61129936A (ja) * 1984-11-29 1986-06-17 Toshiba Corp デ−タ再生回路
FR2609228B1 (fr) * 1986-12-24 1989-12-01 France Etat Procede de diffusion numerique dans des canaux de television
GB2213684A (en) * 1987-12-11 1989-08-16 Philips Electronic Associated Data demodulator baud clock phase locking
US5063574A (en) * 1990-03-06 1991-11-05 Moose Paul H Multi-frequency differentially encoded digital communication for high data rate transmission through unequalized channels
FR2660131B1 (fr) * 1990-03-23 1992-06-19 France Etat Dispositif de transmissions de donnees numeriques a au moins deux niveaux de protection, et dispositif de reception correspondant.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10039902A1 (de) * 2000-08-16 2003-07-03 Rohde & Schwarz Verfahren zur Frequenz- und Zeit-Synchronisation eines Empfängers
US7277380B2 (en) 2000-08-16 2007-10-02 Rohde & Schwarz Gmbh & Co. Kg Synchronization of an orthogonal frequency division multiplexing (OFDM) receiver
DE10039902B4 (de) * 2000-08-16 2011-04-28 Rohde & Schwarz Gmbh & Co. Kg Verfahren zur Frequenz- und Zeit-Synchronisation eines Empfängers
DE10112773B4 (de) * 2001-03-16 2012-09-20 Rohde & Schwarz Gmbh & Co Kg Verfahren zur Frequenz- und Zeit-Synchronisation eines OFDM-Empfängers
DE10217879A1 (de) * 2002-04-22 2003-11-13 Ingbuero Ludwig Schaeffler Verfahren und Vorrichtung zum Aufteilen eines vorgegebenen Frequenzbandes, Verfahren und Vorrichtung zur Kanalmodulation, Verfahren und Vorrichtung zur Kanaldemodulation

Also Published As

Publication number Publication date
AU646298B2 (en) 1994-02-17
EP0548205B1 (de) 1997-11-19
KR100199467B1 (ko) 1999-06-15
AU8613691A (en) 1992-04-15
EP0548205A1 (de) 1993-06-30
ATE160475T1 (de) 1997-12-15
JPH06501357A (ja) 1994-02-10
DE69128252D1 (de) 1998-01-02
FI931017A (fi) 1993-03-08
FI931017A0 (fi) 1993-03-08
CA2085728A1 (en) 1991-10-17
US5345440A (en) 1994-09-06
GB9020170D0 (en) 1990-10-24
WO1992005646A1 (en) 1992-04-02
HK1004359A1 (en) 1998-11-20

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