MX9709523A - Metodo y disposicion del circuito para mejorar la recepcion cuando estan siendo transmitidas señales digitales. - Google Patents

Metodo y disposicion del circuito para mejorar la recepcion cuando estan siendo transmitidas señales digitales.

Info

Publication number
MX9709523A
MX9709523A MX9709523A MX9709523A MX9709523A MX 9709523 A MX9709523 A MX 9709523A MX 9709523 A MX9709523 A MX 9709523A MX 9709523 A MX9709523 A MX 9709523A MX 9709523 A MX9709523 A MX 9709523A
Authority
MX
Mexico
Prior art keywords
carriers
fft
receiver
transmission
filtration
Prior art date
Application number
MX9709523A
Other languages
English (en)
Inventor
Claus Muschallik
Veit Armbruster
Original Assignee
Thomson Brandt Gmbh
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 Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of MX9709523A publication Critical patent/MX9709523A/es

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
    • 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
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2644—Modulators with oversampling

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mathematical Physics (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Television Systems (AREA)
  • Radio Relay Systems (AREA)
  • Selective Calling Equipment (AREA)
  • Polyamides (AREA)
  • Radio Transmission System (AREA)

Abstract

En el caso del método OFDM, un gran numero de portadores modulados son transmitidos utilizando multiplexado de division de frecuencia, un espectro que tiene una forma virtualmente rectangular que es producida por un resultado del gran numero de portadores. Con el fin de separar los portadores uno del otro otra vez en el receptor, se lleva a cabo una transformacion rápida de Fourier, esto entonces siendo posible para separar cada portador claramente de los otros con la condicion que los portadores sean exactamente ortogonales con respecto uno al otro. La ortogonalidad del portador, puede sin embargo, ser perturbada por varias causas. Adicionalmente, la señal deseada debe ser separada de las señales de canal adyacentes no deseadas por filtracion análoga o digital en el receptor. Con el fin de mejorar la separacion del portador y el canal, puede ser incrementada la selectividad de la filtracion de FFT alargando el numero de componentes de FFT. Sin embargo, esto conduce normalmente a un incremento agudo no deseado en la complejidad el cálculo. El refinamiento de acuerdo a la invencion del tiempo el cual se utiliza para la FFT y el sobremuestreado antes de la FFT hace esto posible, sin embargo, para eximir el cálculo de alguno de los coeficientes.
MX9709523A 1995-06-07 1996-05-23 Metodo y disposicion del circuito para mejorar la recepcion cuando estan siendo transmitidas señales digitales. MX9709523A (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19520353A DE19520353A1 (de) 1995-06-07 1995-06-07 Verfahren und Schaltungsanordnung zur Verbesserung des Empfangsverhaltens bei der Übertragung von digitalen Signalen
PCT/EP1996/002209 WO1996041458A1 (de) 1995-06-07 1996-05-23 Verfahren und schaltungsanordnung zur verbesserung der trägertrennung bei der übertragung von ofdm signalen

Publications (1)

Publication Number Publication Date
MX9709523A true MX9709523A (es) 1998-03-31

Family

ID=7763574

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9709523A MX9709523A (es) 1995-06-07 1996-05-23 Metodo y disposicion del circuito para mejorar la recepcion cuando estan siendo transmitidas señales digitales.

Country Status (10)

Country Link
US (1) US6088327A (es)
EP (1) EP0830771B1 (es)
JP (1) JP3769298B2 (es)
KR (1) KR100377785B1 (es)
CN (1) CN1153425C (es)
AT (1) ATE405079T1 (es)
BR (1) BR9608613B1 (es)
DE (2) DE19520353A1 (es)
MX (1) MX9709523A (es)
WO (1) WO1996041458A1 (es)

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DE10239810A1 (de) 2002-08-29 2004-03-11 Siemens Ag Verfahren und Sendeeinrichtung zum Übertragen von Daten in einem Mehrträgersystem
US7400573B2 (en) * 2003-04-29 2008-07-15 Intel Corporation Dynamic allocation of cyclic extension in orthogonal frequency division multiplexing systems
DE102004056478B3 (de) * 2004-11-23 2006-04-06 Infineon Technologies Ag Verfahren und Vorrichtung zum Empfang von modulierten analogen Signalen
KR100703523B1 (ko) 2005-01-17 2007-04-03 삼성전자주식회사 직교 주파수 분할 다중 수신기에서 에러 벡터 크기를감소시키기 위한 방법 및 장치
EP1699197A1 (en) * 2005-01-27 2006-09-06 Alcatel Method for sending channel quality information in a multi-carrier radio communication system, corresponding mobile terminal and base station
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Also Published As

Publication number Publication date
BR9608613A (pt) 1999-06-29
EP0830771B1 (de) 2008-08-13
JP3769298B2 (ja) 2006-04-19
CN1186583A (zh) 1998-07-01
JPH11506590A (ja) 1999-06-08
CN1153425C (zh) 2004-06-09
ATE405079T1 (de) 2008-08-15
DE19520353A1 (de) 1996-12-12
KR19990022601A (ko) 1999-03-25
EP0830771A1 (de) 1998-03-25
US6088327A (en) 2000-07-11
KR100377785B1 (ko) 2003-05-17
WO1996041458A1 (de) 1996-12-19
DE59611482D1 (de) 2008-09-25
BR9608613B1 (pt) 2010-09-21

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Legal Events

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FG Grant or registration
MM Annulment or lapse due to non-payment of fees