BRPI0410013A - método e aparelho para sincronizar um sinal de modulação com múltiplos nìveis - Google Patents

método e aparelho para sincronizar um sinal de modulação com múltiplos nìveis

Info

Publication number
BRPI0410013A
BRPI0410013A BRPI0410013-1A BRPI0410013A BRPI0410013A BR PI0410013 A BRPI0410013 A BR PI0410013A BR PI0410013 A BRPI0410013 A BR PI0410013A BR PI0410013 A BRPI0410013 A BR PI0410013A
Authority
BR
Brazil
Prior art keywords
shorter
block
lower layer
data
ldpc
Prior art date
Application number
BRPI0410013-1A
Other languages
English (en)
Inventor
Joshua Koslov
Kumar Ramaswamy
Original Assignee
Thomson Licensing
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 Licensing filed Critical Thomson Licensing
Publication of BRPI0410013A publication Critical patent/BRPI0410013A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18517—Transmission equipment in earth stations
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • 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
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Quality & Reliability (AREA)
  • General Physics & Mathematics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radio Relay Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Error Detection And Correction (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

"MéTODO E APARELHO PARA SINCRONIZAR UM SINAL DE MODULAçãO COM MúLTIPLOS NìVEIS". Trata-se de um sistema de comunicações por satélite que compreende um transmissor, um transponder de satélite e um receptor. O transmissor transmite um sinal modulado com múltiplos níveis de enlace ascendente (modulação hierárquica, modulação em camadas, etc.) para o transponder de satélite, o qual difunde o enlace ascendente do sinal modulado com múltiplos níveis para um ou mais receptores. O sinal modulado com múltiplos níveis compreende uma camada superior e uma camada inferior. A camada inferior conduz blocos LDPC, ou quadros LDPC, cada bloco LDPC compreendendo S bits de dados incluindo uma parte de cabeçalho e uma parte portadora de dados. A camada superior conduz blocos mais curtos, cada bloco mais curto compreendendo R bits de dados, onde R < S, o bloco mais curto também compreendendo uma parte de cabeçalho e uma parte portadora de dados. O transmissor sincroniza o início da transmissão de cada bloco LDPC com o início da transmissão de um bloco mais curto. O receptor utiliza os blocos mais curtos recebidos para ajudar na busca por dados particulares na parte de camada inferior do sinal modulado com múltiplos níveis recebido. Em particular, o receptor busca por dados de sincronização na parte de camada inferior do sinal recebido quando da detecção da parte de cabeçalho em um bloco mais curto recebido.
BRPI0410013-1A 2003-05-05 2004-04-30 método e aparelho para sincronizar um sinal de modulação com múltiplos nìveis BRPI0410013A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46794603P 2003-05-05 2003-05-05
PCT/US2004/013647 WO2004100479A1 (en) 2003-05-05 2004-04-30 Method and apparatus for synchronizing a multi-level modulation signal

Publications (1)

Publication Number Publication Date
BRPI0410013A true BRPI0410013A (pt) 2006-04-25

Family

ID=33435146

Family Applications (3)

Application Number Title Priority Date Filing Date
BRPI0410036-0A BRPI0410036A (pt) 2003-05-05 2004-04-24 aparelho e método para uso em decodificação iterativa
BRPI0410010-7A BRPI0410010A (pt) 2003-05-05 2004-04-24 aparelho e método para decodificação em um sistema de modulação hierárquico
BRPI0410013-1A BRPI0410013A (pt) 2003-05-05 2004-04-30 método e aparelho para sincronizar um sinal de modulação com múltiplos nìveis

Family Applications Before (2)

Application Number Title Priority Date Filing Date
BRPI0410036-0A BRPI0410036A (pt) 2003-05-05 2004-04-24 aparelho e método para uso em decodificação iterativa
BRPI0410010-7A BRPI0410010A (pt) 2003-05-05 2004-04-24 aparelho e método para decodificação em um sistema de modulação hierárquico

Country Status (8)

Country Link
US (1) US7464318B2 (pt)
EP (3) EP1620984B1 (pt)
JP (3) JP4642753B2 (pt)
KR (3) KR101051213B1 (pt)
CN (3) CN100512244C (pt)
BR (3) BRPI0410036A (pt)
DE (1) DE602004016312D1 (pt)
WO (3) WO2004100475A2 (pt)

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Also Published As

Publication number Publication date
WO2004100478A3 (en) 2005-05-19
JP2006527532A (ja) 2006-11-30
US7464318B2 (en) 2008-12-09
CN100512244C (zh) 2009-07-08
CN1784875A (zh) 2006-06-07
BRPI0410036A (pt) 2006-04-25
JP4603536B2 (ja) 2010-12-22
JP2006525763A (ja) 2006-11-09
WO2004100479A1 (en) 2004-11-18
BRPI0410010A (pt) 2006-04-25
EP1620984A2 (en) 2006-02-01
JP4516959B2 (ja) 2010-08-04
WO2004100475A3 (en) 2005-01-13
JP2006525767A (ja) 2006-11-09
EP1620987A2 (en) 2006-02-01
WO2004100475A2 (en) 2004-11-18
US20060212776A1 (en) 2006-09-21
WO2004100478A2 (en) 2004-11-18
DE602004016312D1 (de) 2008-10-16
CN1784877A (zh) 2006-06-07
KR20060010780A (ko) 2006-02-02
EP1620984B1 (en) 2008-09-03
EP1620986A1 (en) 2006-02-01
WO2004100478B1 (en) 2005-07-14
KR101051213B1 (ko) 2011-07-21
KR20060054179A (ko) 2006-05-22
JP4642753B2 (ja) 2011-03-02
KR20060010781A (ko) 2006-02-02
CN1784877B (zh) 2012-09-26
CN1784878A (zh) 2006-06-07

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