NO951732L - Fremgangsmåte og apparat for gjenvinning av QAM-bærer - Google Patents

Fremgangsmåte og apparat for gjenvinning av QAM-bærer

Info

Publication number
NO951732L
NO951732L NO951732A NO951732A NO951732L NO 951732 L NO951732 L NO 951732L NO 951732 A NO951732 A NO 951732A NO 951732 A NO951732 A NO 951732A NO 951732 L NO951732 L NO 951732L
Authority
NO
Norway
Prior art keywords
subset
points
carrier
constellation pattern
data points
Prior art date
Application number
NO951732A
Other languages
English (en)
Other versions
NO951732D0 (no
Inventor
Zheng Huang
Original Assignee
Gen Instrument Corp
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 Gen Instrument Corp filed Critical Gen Instrument Corp
Publication of NO951732D0 publication Critical patent/NO951732D0/no
Publication of NO951732L publication Critical patent/NO951732L/no

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
    • 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
    • H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
    • H04L27/3827—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using only the demodulated baseband signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Amplitude Modulation (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Noise Elimination (AREA)
  • Cephalosporin Compounds (AREA)
  • Peptides Or Proteins (AREA)

Abstract

Fremgangsmåte og anordning er tilveiebragt for å gjenvinne og følge bærebølgen i et QAM kommunikasjonssystem, endog under kraftige interferensforhold. Et delsett av faste punkter (38) defineres på et ideelt konstellasjonsmønster 830) for sammenligning med datapunktene i et mottatt signal. Delsettet innbefatter samtlige av punktene (38) som skjermes av n radier (40, 42, 44, 46) (f.eks. de fire diagonalene) i konstellasjonsmønsteret (30). Ytterligere punkter langs omkretsen av konstellasjonsmønsteret (36a-h) kan også tilveiebringes i delsettet. Datapunkter som mottas via bærebølgen korreleres med de faste punktene (38) i delsettet for å generere et feilsignal som indikerer en faseforskjell mellom de faste punktene i delsettet og de mottatte datapunktene som korreleres med disse.
NO951732A 1994-05-05 1995-05-04 Fremgangsmåte og apparat for gjenvinning av QAM-bærer NO951732L (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/238,316 US5519733A (en) 1994-05-05 1994-05-05 Method and apparatus for recovering a qam carrier

Publications (2)

Publication Number Publication Date
NO951732D0 NO951732D0 (no) 1995-05-04
NO951732L true NO951732L (no) 1995-11-06

Family

ID=22897376

Family Applications (1)

Application Number Title Priority Date Filing Date
NO951732A NO951732L (no) 1994-05-05 1995-05-04 Fremgangsmåte og apparat for gjenvinning av QAM-bærer

Country Status (11)

Country Link
US (1) US5519733A (no)
EP (1) EP0681386B1 (no)
JP (1) JPH0846661A (no)
KR (1) KR100365383B1 (no)
AT (1) ATE198247T1 (no)
AU (1) AU681767B2 (no)
CA (1) CA2148200C (no)
DE (1) DE69519646T2 (no)
ES (1) ES2153865T3 (no)
NO (1) NO951732L (no)
TW (1) TW257916B (no)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3041175B2 (ja) * 1993-11-12 2000-05-15 株式会社東芝 Ｏｆｄｍ同期復調回路
JP3269933B2 (ja) * 1995-03-20 2002-04-02 富士通株式会社 キャリア再生回路
JPH09214578A (ja) * 1996-01-30 1997-08-15 Fujitsu Ltd 搬送波再生回路
KR970068393A (ko) * 1996-03-11 1997-10-13 김광호 이산 다중 톤 시스템 수신단의 샘플링 클럭 복원 장치 및 방법
GB9618132D0 (en) * 1996-08-30 1996-10-09 Sgs Thomson Microelectronics Improvements in or relating to an ATM switch
US5940450A (en) * 1997-02-28 1999-08-17 Hitachi America, Ltd. Carrier recovery method and apparatus
KR100269257B1 (ko) * 1997-10-28 2000-10-16 정선종 16-큐에이엠진폭변조신호의반송파복원방법
AU1933599A (en) * 1997-12-19 1999-07-12 Blake Rice Automated right-party contact telephone system
US6560294B1 (en) 1998-09-25 2003-05-06 Texas Instruments Incorporated Phase estimation in carrier recovery of phase-modulated signals such as QAM signals
US6738429B1 (en) * 1999-06-01 2004-05-18 Harris Corporation Decision-directed carrier frequency detector and method for QAM
KR100390842B1 (ko) * 2000-12-22 2003-07-10 주식회사 하이닉스반도체 고차 직각변조를 위한 극성판단위상검출회로 및 방법
ATE349842T1 (de) * 2001-02-26 2007-01-15 Juniper Networks Inc Schätzung eines frequenzversatzes, zur anwendung bei kurzen datenbursts
KR100418583B1 (ko) * 2001-05-28 2004-02-11 주식회사 하이닉스반도체 자동 전환방식을 적용한 기어 쉬프트 위상 동기 장치와위상 동기 방법
KR100439220B1 (ko) * 2002-03-26 2004-07-05 엘지전자 주식회사 코드분할다중엑세스 시스템의 통화품질 저하 방지회로 및그 운용방법
US7123663B2 (en) * 2002-06-04 2006-10-17 Agence Spatiale Europeenne Coded digital modulation method for communication system
US20080123788A1 (en) * 2006-11-29 2008-05-29 Supat Wongwirawat Method and apparatus for detecting and correcting modulated signal impairments
US20080123787A1 (en) * 2006-11-29 2008-05-29 Supat Wongwirawat Method and apparatus for detecting and correcting modulated signal impairments
WO2010061435A1 (ja) * 2008-11-25 2010-06-03 富士通株式会社 代替処理判定方法、代替処理判定装置、プログラム、及び携帯電話端末

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2542536B1 (fr) * 1983-03-07 1985-07-12 Trt Telecom Radio Electr Dispositif de recuperation de la porteuse d'un signal d'entree module par sauts d'amplitude et par sauts de phase
FR2621188B1 (fr) * 1987-09-25 1989-12-29 Labo Electronique Physique Circuit de recuperation de l'onde porteuse de systemes de transmissions numeriques
JP2927929B2 (ja) * 1990-10-29 1999-07-28 日本電気株式会社 搬送波同期回路
DE4216156C1 (no) * 1992-05-15 1993-08-19 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De

Also Published As

Publication number Publication date
AU1785095A (en) 1995-11-16
JPH0846661A (ja) 1996-02-16
KR950035230A (ko) 1995-12-30
ES2153865T3 (es) 2001-03-16
EP0681386A2 (en) 1995-11-08
EP0681386A3 (en) 1995-11-15
TW257916B (en) 1995-09-21
DE69519646D1 (de) 2001-01-25
NO951732D0 (no) 1995-05-04
KR100365383B1 (ko) 2003-03-03
CA2148200A1 (en) 1995-11-06
AU681767B2 (en) 1997-09-04
DE69519646T2 (de) 2001-08-02
US5519733A (en) 1996-05-21
ATE198247T1 (de) 2001-01-15
CA2148200C (en) 2002-09-17
EP0681386B1 (en) 2000-12-20

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