ES2184745T3 - Procedimiento para la correccion de errores de fases y de amplitudes en señales cofdm. - Google Patents

Procedimiento para la correccion de errores de fases y de amplitudes en señales cofdm.

Info

Publication number
ES2184745T3
ES2184745T3 ES94104557T ES94104557T ES2184745T3 ES 2184745 T3 ES2184745 T3 ES 2184745T3 ES 94104557 T ES94104557 T ES 94104557T ES 94104557 T ES94104557 T ES 94104557T ES 2184745 T3 ES2184745 T3 ES 2184745T3
Authority
ES
Spain
Prior art keywords
phase
carrier frequencies
individual carrier
received
correction
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 - Lifetime
Application number
ES94104557T
Other languages
English (en)
Inventor
Johannes Reis
Markus Grundig E M V Zumkeller
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.)
Grundig AG
Original Assignee
Grundig AG
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 Grundig AG filed Critical Grundig AG
Application granted granted Critical
Publication of ES2184745T3 publication Critical patent/ES2184745T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04L27/2647—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
    • H04L27/2673—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 encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Circuits Of Receivers In General (AREA)
  • Radio Transmission System (AREA)

Abstract

EN LA TRANSMISION DE DATOS A DISTANCIA SEGUN EL PROCEDIMIENTO COFDM SE MODULAN EN FASE LAS FRECUENCIAS PORTADORAS INDIVIDUALES UTILIZADAS. PARA LA DEMODULACION DE LAS FRECUENCIAS INDIVIDUALES EN EL RECEPTOR SE TRANSMITEN EN CADA MARCO DE TRANSMISION UNA SEÑAL DE REFERENCIA DE FASE. LA DIFERENCIA DE FASE Y LA FRECUENCIAS PORTADORA INDIVIDUAL RECIBIDA EN EL MISMO MARCO DE TRANSMISION CONTIENE POR ELLO LA INFORMACION TRANSMITIDA. ES PROBLEMATICO CON ELLO LA DISTORSION DE LAS FRECUENCIAS PORTADORAS INDIVIDUALES, EN FASE Y AMPLITUD, QUE PUEDEN SER ORIGINADAS POR MEDIO DE GRUPOS DE CONSTRUCCION DEL EMISOR Y RECEPTOR Y A TRAVES DEL TRAMO DE TRANSMISION. EL NUEVO PROCEDIMIENTO PERMITE UNA CORRECCION DE ESTAS DISTORSIONES, ASI COMO CON ELLO PUEDE SER OFRECIDO UN MODELO MATEMATICO. PARA LA CORRECCION DE LA FASE DE LAS FRECUENCIAS PORTADORAS INDIVIDUALES RECIBIDAS SE CALCULA PARA LA DISTORSION DE FASE DE LA SEÑAL DE REFERENCIA DE FASE UN MODELO MATEMATICO EN DEPENDENCIA DEL TIEMPO. LAS SEÑALES RECIBIDAS ENTRE DOS SEÑALES DE REFERENCIA DE FASE SE CORRIGEN DE FORMA BASADA EN ESTE MODELO MATEMATICO DEL DESARROLLO TEMPORAL DE LA FASE DE REFERENCIA. Y ADICIONALMENTE PARA ELIMINAR LAS DISTORSIONES DE FASES CASUALES SE REALIZA UNA DETERMINACION LIKELIHOOD MAXIMA CON LOS VALORES DE FASE CORREGIDOS. LA CORRECCION DE LA AMPLITUD DE LAS FRECUENCIAS PORTADORAS INDIVIDUALES SE CONSIGUE POR MEDIO DE UN VALOR DE DIRECCION DE AMPLITUD, QUE SE DETERMINA A PARTIR DE LAS AMPLITUDES ANTES DE LAS FRECUENCIAS PORTADORAS INDIVIDUALES RECIBIDAS. EL NUEVO PROCEDIMIENTO PERMITE LA CORRECCION DE FRECUENCIAS PORTADORAS INDIVIDUALES MODULADAS EN FASE Y PUEDEN SER UTILIZADAS EN TRANSMISIONES SEGUN EL PROCEDIMIENTO COFDM.
ES94104557T 1993-03-27 1994-03-23 Procedimiento para la correccion de errores de fases y de amplitudes en señales cofdm. Expired - Lifetime ES2184745T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4310031A DE4310031C2 (de) 1993-03-27 1993-03-27 Verfahren zur Korrektur von Phase und Amplitude eines breitbandigen Empfangssignals mit Hilfe von Referenzsignalen

Publications (1)

Publication Number Publication Date
ES2184745T3 true ES2184745T3 (es) 2003-04-16

Family

ID=6484044

Family Applications (1)

Application Number Title Priority Date Filing Date
ES94104557T Expired - Lifetime ES2184745T3 (es) 1993-03-27 1994-03-23 Procedimiento para la correccion de errores de fases y de amplitudes en señales cofdm.

Country Status (4)

Country Link
EP (1) EP0618697B1 (es)
AT (1) ATE225102T1 (es)
DE (2) DE4310031C2 (es)
ES (1) ES2184745T3 (es)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577068A (en) * 1992-06-08 1996-11-19 Ericsson Ge Mobile Communications Inc. Generalized direct update viterbi equalizer
DE4420283A1 (de) * 1994-06-10 1995-12-14 Ant Nachrichtentech Verfahren zur Trägerfrequenzsynchronisation
SE504787C2 (sv) * 1994-12-14 1997-04-28 Hd Divine Ab Metod vid OFDM-mottagning för korrigering av frekvens, tidsfönster, samplingsklocka och långsamma fasvariationer
DE19501083C2 (de) * 1995-01-16 1997-06-26 Siemens Ag Optimierungsverfahren für die frequenzabhängige Verstärkung eines an eine Übertragungsstrecke angekoppelten Empfängers
FR2738094B1 (fr) * 1995-08-21 1997-09-26 France Telecom Procede et dispositif de modification de la demodulation coherente d'un systeme multiporteuse pour diminuer le biais introduit par une distorsion blanche en frequence
FR2738095B1 (fr) * 1995-08-21 1997-11-07 France Telecom Procede et dispositif de demodulation d'un signal multiporteuse tenant compte d'une estimation de la reponse du canal de transmission et d'une estimaton d'une distorsion blanche en frequence
DE19638654A1 (de) * 1996-09-20 1998-03-26 Siemens Ag Verfahren zur digitalen Nachrichtenübertragung
GB9700947D0 (en) * 1997-01-17 1997-03-05 Digi Media Vision Ltd Method and apparatus for receiving frequency division multiplex signals
GB9701984D0 (en) * 1997-01-31 1997-03-19 Digi Media Vision Ltd Method and apparatus for recovering the amplitude and phase of an input data signal
GB9703634D0 (en) * 1997-02-21 1997-04-09 Digi Media Vision Ltd Method and apparatus for transmitting frequency division multiplex signals
EP1933516A3 (en) * 1997-05-02 2009-03-04 LSI Logic Corporation Demodulating video broadcast signals
US6618352B1 (en) 1998-05-26 2003-09-09 Matsushita Electric Industrial Co., Ltd. Modulator, demodulator, and transmission system for use in OFDM transmission
DE19914324C1 (de) * 1999-03-30 2001-01-11 Iad Gmbh Kommunikationssystem zur Datenübertragung in einem vermaschten Netzwerk unter Verwendung eines Verfahrens mit Muliträgerübertragung
WO2008052573A1 (en) * 2006-10-30 2008-05-08 Fundacio Privada Centre Tecnologic De Telecomunicacions De Catalunya Residual carrier frequency offset estimation and correction in ofdm multi-antenna systems

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621355A (en) * 1983-08-04 1986-11-04 Nec Corporation Method of synchronizing parallel channels of orthogonally multiplexed parallel data transmission system and improved automatic equalizer for use in such a transmission system
FR2604316B2 (fr) * 1986-07-02 1989-05-05 France Etat Procede et installation de communication de donnees numeriques vers des mobiles
CH675514A5 (es) * 1988-04-07 1990-09-28 Ascom Zelcom Ag
ES2065409T3 (es) * 1988-10-21 1995-02-16 Thomson Csf Emisor, procedimiento de emision y receptor.
US5206886A (en) * 1990-04-16 1993-04-27 Telebit Corporation Method and apparatus for correcting for clock and carrier frequency offset, and phase jitter in mulicarrier modems
FR2670062B1 (fr) * 1990-11-30 1993-11-12 Thomson Csf Procede de recalage des oscillateurs locaux d'un recepteur et dispositif pour la mise en óoeuvre du procede.
DE4128713A1 (de) * 1991-08-29 1993-03-04 Daimler Benz Ag Verfahren und anordnung zur messung der traegerfrequenzablage in einem mehrkanaluebertragungssystem
DE4240609C2 (de) * 1992-12-03 1995-05-11 Grundig Emv Verfahren zur Frequenzgangkorrektur

Also Published As

Publication number Publication date
EP0618697B1 (de) 2002-09-25
EP0618697A3 (de) 1995-08-30
DE4310031C2 (de) 1997-07-17
ATE225102T1 (de) 2002-10-15
DE4310031A1 (de) 1994-09-29
EP0618697A2 (de) 1994-10-05
DE59410186D1 (de) 2002-10-31

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