BR9908302A - Sistema de equalização e de sincronização de quadro ofdm - Google Patents

Sistema de equalização e de sincronização de quadro ofdm

Info

Publication number
BR9908302A
BR9908302A BR9908302-7A BR9908302A BR9908302A BR 9908302 A BR9908302 A BR 9908302A BR 9908302 A BR9908302 A BR 9908302A BR 9908302 A BR9908302 A BR 9908302A
Authority
BR
Brazil
Prior art keywords
equalization
frame
synchronization system
ofdm
locate
Prior art date
Application number
BR9908302-7A
Other languages
English (en)
Inventor
Steve Maunsell
Donovan Young
Jiang Lei Ma
Original Assignee
Wavesat Telecom Inc
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 Wavesat Telecom Inc filed Critical Wavesat Telecom Inc
Publication of BR9908302A publication Critical patent/BR9908302A/pt

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
    • H04L27/2655—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the 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
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
    • H04L2025/03439—Fixed structures
    • H04L2025/03522—Frequency domain

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

"SISTEMA DE EQUALIZAçãO E DE SINCRONIZAçãO DE QUADRO OFDM" Trata-se de um método de sincronização de quadros para canais OFDM de um ponto para múltiplos pontos de acordo com um primeiro aspecto da invenção, em que seq³ências de quadros de referência são inseridos em intervalos predeterminados entre seq³ências de quadros de informações. Cada quadro compreende um prefixo cíclico, composto de dois segmentos de dados idênticos, que é usado para localizar um ponto de início de sincronização de quadro por meio da aplicação de uma função de subtração nos dois segmentos de dados para localizar o ponto de início no local do mínimo da função. Um método de equalização de canal para canais OFDM também é proporcionado de acordo com um segundo aspecto da invenção, em que os quadros de referência e os dados conhecidos de um receptor são usados para criar um vetor de equalização para corrigir erros da difusão dos quadros de informações recebidos no lado do receptor.
BR9908302-7A 1998-02-26 1999-02-25 Sistema de equalização e de sincronização de quadro ofdm BR9908302A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/030,865 US6151295A (en) 1998-02-26 1998-02-26 OFDM receiving system
PCT/CA1999/000175 WO1999044326A2 (en) 1998-02-26 1999-02-25 Ofdm frame synchronisation and equalisation system

Publications (1)

Publication Number Publication Date
BR9908302A true BR9908302A (pt) 2000-10-31

Family

ID=21856418

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9908302-7A BR9908302A (pt) 1998-02-26 1999-02-25 Sistema de equalização e de sincronização de quadro ofdm

Country Status (17)

Country Link
US (1) US6151295A (pt)
EP (2) EP1078502A2 (pt)
JP (1) JP2002505551A (pt)
KR (1) KR100729260B1 (pt)
CN (1) CN1248474C (pt)
AU (1) AU3242599A (pt)
BG (1) BG104762A (pt)
BR (1) BR9908302A (pt)
CA (1) CA2320058C (pt)
EA (1) EA003198B1 (pt)
HK (1) HK1034009A1 (pt)
ID (1) ID26957A (pt)
IL (1) IL137894A0 (pt)
NO (1) NO20004252L (pt)
PL (1) PL343241A1 (pt)
UA (1) UA56302C2 (pt)
WO (1) WO1999044326A2 (pt)

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Also Published As

Publication number Publication date
EP1078502A2 (en) 2001-02-28
EA200000882A1 (ru) 2001-04-23
NO20004252L (no) 2000-08-28
BG104762A (bg) 2001-04-30
JP2002505551A (ja) 2002-02-19
CA2320058C (en) 2005-12-20
CN1292191A (zh) 2001-04-18
WO1999044326B1 (en) 1999-12-23
US6151295A (en) 2000-11-21
AU3242599A (en) 1999-09-15
CN1248474C (zh) 2006-03-29
PL343241A1 (en) 2001-07-30
IL137894A0 (en) 2001-10-31
EP1361717A3 (en) 2004-02-11
CA2320058A1 (en) 1999-09-02
NO20004252D0 (no) 2000-08-24
WO1999044326A2 (en) 1999-09-02
KR100729260B1 (ko) 2007-06-15
EA003198B1 (ru) 2003-02-27
EP1361717A2 (en) 2003-11-12
UA56302C2 (uk) 2003-05-15
ID26957A (id) 2001-02-22
HK1034009A1 (en) 2001-10-05
WO1999044326A3 (en) 1999-11-11
KR20010041300A (ko) 2001-05-15

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Legal Events

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B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTA A 5O, 6O, 7O E 8O ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 1911 DE 21/08/2007.