AU2002216142A1 - Method and apparatus for increasing the quality of the receiver synchronization of qam or cap modulated modem connection - Google Patents

Method and apparatus for increasing the quality of the receiver synchronization of qam or cap modulated modem connection

Info

Publication number
AU2002216142A1
AU2002216142A1 AU2002216142A AU1614202A AU2002216142A1 AU 2002216142 A1 AU2002216142 A1 AU 2002216142A1 AU 2002216142 A AU2002216142 A AU 2002216142A AU 1614202 A AU1614202 A AU 1614202A AU 2002216142 A1 AU2002216142 A1 AU 2002216142A1
Authority
AU
Australia
Prior art keywords
qam
quality
cap
receiver synchronization
increasing
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.)
Abandoned
Application number
AU2002216142A
Inventor
Heikki Laamanen
Janne Vaananen
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.)
Infinera Oy
Original Assignee
Tellabs Oy
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 Tellabs Oy filed Critical Tellabs Oy
Publication of AU2002216142A1 publication Critical patent/AU2002216142A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0038—Correction of carrier offset using an equaliser
    • H04L2027/004—Correction of carrier offset using an equaliser the equaliser providing control signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0063—Elements of loops
    • H04L2027/0067—Phase error detectors

Abstract

The invention relates to a method and apparatus for improving the quality of receiver synchronization on QAM- or CAP-modulated modem connections having an adaptive linear equalizer. The invention is based on the finding that in a QAM- or CAP-modulated data transmission system where the symbol rate and the average carrier frequency are in fixed relationship with each other, the vector formed by the In-phase and the Quadrature component of the detector input signal rotates with the timing phase shift of the receiver. The quality of receiver synchronization is improved by utilizing information extracted from the vector rotation.
AU2002216142A 2000-12-05 2001-12-05 Method and apparatus for increasing the quality of the receiver synchronization of qam or cap modulated modem connection Abandoned AU2002216142A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20002670A FI112306B (en) 2000-12-05 2000-12-05 Method and Equipment for Improving the Quality of Receiver Synchronization on a QAM or CAP Modulated Modem Connection
FI20002670 2000-12-05
PCT/FI2001/001060 WO2002047346A1 (en) 2000-12-05 2001-12-05 Method and apparatus for increasing the quality of the receiver synchronization of qam or cap modulated modem connection

Publications (1)

Publication Number Publication Date
AU2002216142A1 true AU2002216142A1 (en) 2002-06-18

Family

ID=8559652

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2002216142A Abandoned AU2002216142A1 (en) 2000-12-05 2001-12-05 Method and apparatus for increasing the quality of the receiver synchronization of qam or cap modulated modem connection

Country Status (7)

Country Link
US (1) US7359467B2 (en)
EP (1) EP1340348B1 (en)
AT (1) ATE376740T1 (en)
AU (1) AU2002216142A1 (en)
DE (1) DE60131097T2 (en)
FI (1) FI112306B (en)
WO (1) WO2002047346A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7447261B2 (en) * 2003-07-08 2008-11-04 Conexant Systems, Inc. Adaptive frequency equalizer
RU2350031C1 (en) * 2007-07-04 2009-03-20 Игорь Борисович Дунаев Method of transmission and reception of signals of quarter phase peak modulation, system for its realisation, machine-readable carrier and application of this method for synchronisation of reception of quarter phase peak modulation signals
JP2009088793A (en) * 2007-09-28 2009-04-23 Fujitsu Ltd Synchronizing system, synchronizing signal transmitting apparatus, clock supplying apparatus, and synchronizing method
CN102523017B (en) * 2011-12-01 2014-01-01 清华大学 Chip of single-carrier ultra-wideband receiver
US11870621B2 (en) * 2019-11-27 2024-01-09 Faraidoon Pundole Remote device telemetry and communication

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08139782A (en) 1994-11-11 1996-05-31 Fujitsu Ltd Carrier regenerating circuit
US5550596A (en) * 1994-11-25 1996-08-27 Thomson Multimedia Sa Digital television signal processing system including a co-channel rejection filter
US6021167A (en) * 1996-05-09 2000-02-01 Texas Instruments Incorporated Fast equalizer training and frame synchronization algorithms for discrete multi-tone (DMT) system
JPH1056487A (en) 1996-08-09 1998-02-24 Nec Corp Quadrature demodulation circuit
US5878088A (en) * 1997-04-10 1999-03-02 Thomson Consumer Electronics, Inc. Digital variable symbol timing recovery system for QAM
US6904110B2 (en) * 1997-07-31 2005-06-07 Francois Trans Channel equalization system and method
SE9801748L (en) 1998-05-18 1999-11-19 Telia Ab Improvements in or relating to telecommunication transmission systems
US6259743B1 (en) * 1998-07-02 2001-07-10 Lucent Technologies Inc. Automatic constellation phase recovery in blind start-up of a dual mode CAP-QAM receiver
DE60029687T2 (en) 1999-06-22 2007-10-18 Matsushita Electric Industrial Co., Ltd., Kadoma Symbol clock synchronization in multi-carrier receivers
US20040246891A1 (en) * 1999-07-23 2004-12-09 Hughes Electronics Corporation Air interface frame formatting
US6836507B1 (en) * 2000-08-14 2004-12-28 General Dynamics Decision Systems, Inc. Symbol synchronizer for software defined communications system signal combiner

Also Published As

Publication number Publication date
WO2002047346A1 (en) 2002-06-13
US7359467B2 (en) 2008-04-15
DE60131097D1 (en) 2007-12-06
FI20002670A0 (en) 2000-12-05
FI20002670A (en) 2002-06-06
FI112306B (en) 2003-11-14
EP1340348A1 (en) 2003-09-03
US20040022328A1 (en) 2004-02-05
DE60131097T2 (en) 2008-08-07
EP1340348B1 (en) 2007-10-24
ATE376740T1 (en) 2007-11-15

Similar Documents

Publication Publication Date Title
KR0136718B1 (en) Synchronisation of ofdm signals
US4943980A (en) Multi-carrier high speed modem
AU655534B2 (en) Quadrature amplitude modulation synchronization method
CN1087543C (en) A digital communication system and a receiver for use in such a system
JP2004134883A (en) Receiver
GB2320871A (en) Frame synchronization in digital communication systems utilizing OFDM
KR940027562A (en) Digital transmission system for digital signal transmission, transmitter and receiver for digital transmission system, and digital transmission method
CA2389470A1 (en) Method and apparatus for transmission and reception of fm in-band on-channel digital audio broadcasting
KR19990043408A (en) Method and apparatus for simple frequency acquisition of orthogonal split-band systems
US4518922A (en) Decision-directed, automatic frequency control technique for non-coherently demodulated M-ARY frequency shift keying
KR20040089134A (en) Method and apparatus for combining phase shift keying and pulse position modulation
KR970072721A (en) Digital audio broadcasting transmission system
US7016298B2 (en) Signal transmission/reception system of orthogonal frequency division multiplexing
JP4809097B2 (en) Reception circuit and reception method
EP0917325A3 (en) Single sideband transmission of QPSK, QAM and other signals
AU2002216142A1 (en) Method and apparatus for increasing the quality of the receiver synchronization of qam or cap modulated modem connection
EP2090049A1 (en) Amplitude-differential phase shift keying modulation apparatus and method
JP4809099B2 (en) Reception circuit and reception method
JP2004201131A (en) Wireless device
CA1254622A (en) Digital communication system
WO2021089322A1 (en) Digital receiver with phase offset compensation
FI107971B (en) Method and arrangement for synchronizing a receiver to a quadrature-amplitude modulated signal
JP2000269930A (en) Synchronization system for multi-carrier receiver, synchronizing circuit for multi-carrier receiver, and multi-carrier receiver
JP3558811B2 (en) Modulator and modulation method, demodulator and demodulation method
JPH06232939A (en) Frame synchronization circuit