WO1998035544A3 - System and method for harmonic interference avoidance in carrier recovery for digital demodulation - Google Patents

System and method for harmonic interference avoidance in carrier recovery for digital demodulation Download PDF

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Publication number
WO1998035544A3
WO1998035544A3 PCT/US1998/000826 US9800826W WO9835544A3 WO 1998035544 A3 WO1998035544 A3 WO 1998035544A3 US 9800826 W US9800826 W US 9800826W WO 9835544 A3 WO9835544 A3 WO 9835544A3
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
frequency
demodulator
harmonic frequencies
carrier recovery
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.)
Ceased
Application number
PCT/US1998/000826
Other languages
French (fr)
Other versions
WO1998035544A2 (en
Inventor
Ion Coman
Kenneth M Hanna
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.)
Scientific Atlanta LLC
Original Assignee
Scientific Atlanta LLC
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 Scientific Atlanta LLC filed Critical Scientific Atlanta LLC
Priority to AU60273/98A priority Critical patent/AU6027398A/en
Priority to DE69812914T priority patent/DE69812914T2/en
Priority to JP53573298A priority patent/JP2002501688A/en
Priority to CA002279850A priority patent/CA2279850A1/en
Priority to EP98903523A priority patent/EP0962046B1/en
Publication of WO1998035544A2 publication Critical patent/WO1998035544A2/en
Publication of WO1998035544A3 publication Critical patent/WO1998035544A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H03D7/165—Multiple-frequency-changing at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
    • H03J2200/31—Several sweeping or scanning speeds

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

The present invention relates to an improved demodulator for locking onto and tracking a carrier. Harmonic frequencies are occasionally generated by demodulation circuitry. When this occurs, the harmonic frequencies can interfere with the demodulator's locking and tracking functions, especially if the harmonic frequencies are near a down converted carrier's frequency. A system and method are disclosed which provides an offset to a frequency synthesizer (107) whose output frequency (F1, F2) is used to down convert (104) the carrier. The offset alters the frequency of the down converted carrier so as to shift it away from the interfering harmonics. In this regard, the demodulator is enabled to lock onto and track a carrier when previously not possible.
PCT/US1998/000826 1997-01-31 1998-01-15 System and method for harmonic interference avoidance in carrier recovery for digital demodulation Ceased WO1998035544A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU60273/98A AU6027398A (en) 1997-01-31 1998-01-15 System and method for harmonic interference avoidance in carrier recovery for digital demodulation
DE69812914T DE69812914T2 (en) 1997-01-31 1998-01-15 ARRANGEMENT AND METHOD FOR REDUCING INTERFERENCES IN VEHICLE RECOVERY FOR DIGITAL DEMODULATION
JP53573298A JP2002501688A (en) 1997-01-31 1998-01-15 System and method for avoiding harmonic interference in carrier recovery for digital demodulation
CA002279850A CA2279850A1 (en) 1997-01-31 1998-01-15 System and method for harmonic interference avoidance in carrier recovery for digital demodulation
EP98903523A EP0962046B1 (en) 1997-01-31 1998-01-15 System and method for harmonic interference avoidance in carrier recovery for digital demodulation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3676997P 1997-01-31 1997-01-31
US60/036,769 1997-01-31

Publications (2)

Publication Number Publication Date
WO1998035544A2 WO1998035544A2 (en) 1998-08-20
WO1998035544A3 true WO1998035544A3 (en) 1998-10-22

Family

ID=21890540

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/000826 Ceased WO1998035544A2 (en) 1997-01-31 1998-01-15 System and method for harmonic interference avoidance in carrier recovery for digital demodulation

Country Status (8)

Country Link
US (1) US6148039A (en)
EP (1) EP0962046B1 (en)
JP (1) JP2002501688A (en)
AU (1) AU6027398A (en)
CA (1) CA2279850A1 (en)
DE (1) DE69812914T2 (en)
TW (1) TW391114B (en)
WO (1) WO1998035544A2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11205172A (en) 1998-01-12 1999-07-30 Alps Electric Co Ltd Tuner for satellite broadcasting receiver
DE69921475T2 (en) * 1999-03-11 2006-02-02 Mitsubishi Denki K.K. RADIO TERMINAL
EP1063826A1 (en) * 1999-06-25 2000-12-27 Sony International (Europe) GmbH Carrier recovery means in digital quadrature receivers
GB0020527D0 (en) 2000-08-22 2000-10-11 Mitel Semiconductor Ltd Digital tuner
GB0210849D0 (en) * 2002-05-11 2002-06-19 Cedardell Ltd Method of processing radio frequency signals and radio frequency receiver apparatus for use in such method
US7675996B2 (en) * 2003-02-28 2010-03-09 Johnson Richard A Television receiver suitable for multi-standard operation and method therefor
US8532225B2 (en) * 2008-03-19 2013-09-10 Freescale Semiconductor, Inc. DC compensation for VLIF signals
EP2343803B1 (en) 2010-01-11 2013-09-11 Elster Automatic frequency offset compensation method and device
EP2343813B1 (en) 2010-01-11 2013-05-15 Elster Method and system of power management for electronic devices
US11165622B2 (en) * 2019-10-18 2021-11-02 Hughes Network Systems, LLC. System and method for low-rate high-rate coupled acquisition and tracking of high symbol rate inroutes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314206A (en) * 1979-12-26 1982-02-02 Motorola Inc. Noise chopper for preventing false locks in a coherent carrier recovery system
US4354277A (en) * 1979-11-23 1982-10-12 Trw Inc. Signal acquisition system
US4513448A (en) * 1983-08-12 1985-04-23 The United States Of America As Represented By The Secretary Of The Army Low power radio synthesizer with harmonic identification feature
US4979230A (en) * 1989-12-04 1990-12-18 General Instrument Corporation Up-conversion homodyne receiver for cable television converter with frequency offset to avoid adjacent channel interference
US5222106A (en) * 1990-02-07 1993-06-22 Kokusai Denshin Denwa Kabushiki Kaisha Interference detection and reduction

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000476A (en) * 1974-12-19 1976-12-28 Digital Communications Corporation Phase locked loop with circuit for preventing sidelock
US4042884A (en) * 1975-02-20 1977-08-16 Rixon, Inc. Phase demodulator with offset frequency reference oscillator
US4246546A (en) * 1979-04-05 1981-01-20 Motorola, Inc. Apparatus and method for locking a PLL onto a selected offset frequency sideband
US4545072A (en) * 1982-02-22 1985-10-01 Motorola, Inc. Method and apparatus for eliminating interference due to spurious signals generated in synthesized receivers
US4568888A (en) * 1983-11-08 1986-02-04 Trw Inc. PLL Fast frequency synthesizer with memories for coarse tuning and loop gain correction
US4590440A (en) * 1984-07-06 1986-05-20 American Microsystems, Inc. Phase locked loop with high and/or low frequency limit detectors for preventing false lock on harmonics
US4613825A (en) * 1984-12-20 1986-09-23 Motorola, Inc. Rapid acquisition, tracking PLL with fast and slow sweep speeds
US4761825A (en) * 1985-10-30 1988-08-02 Capetronic (Bsr) Ltd. TVRO earth station receiver for reducing interference and improving picture quality
US4718117A (en) * 1985-10-30 1988-01-05 Capetronic (Bsr) Ltd. TVRO receiver system with low-cost video-noise reduction filter
US4876739A (en) * 1985-10-30 1989-10-24 Capetronic (Bsr) Ltd. TVRO receiver system with low-cost video-noise reduction filter
JPH0810879B2 (en) * 1986-02-20 1996-01-31 富士通株式会社 Demodulator
JPH0710051B2 (en) * 1987-07-16 1995-02-01 八重洲無線株式会社 Wireless receiver
DE3784930T2 (en) * 1987-09-03 1993-09-02 Philips Nv RECEIVER WITH TWO BRANCHES.
US4944025A (en) * 1988-08-09 1990-07-24 At&E Corporation Direct conversion FM receiver with offset
US4910467A (en) * 1988-11-02 1990-03-20 Motorola, Inc. Method and apparatus for decoding a quadrature modulated signal
US4866395A (en) * 1988-11-14 1989-09-12 Gte Government Systems Corporation Universal carrier recovery and data detection for digital communication systems
US5042052A (en) * 1990-02-16 1991-08-20 Harris Corporation Carrier acquisition scheme for QAM and QPSK data
US5212817A (en) * 1990-09-14 1993-05-18 Atkinson Noel D Ultra high speed scan system
JPH04192702A (en) * 1990-11-27 1992-07-10 Toshiba Corp Demodulation circuit
US5184092A (en) * 1990-12-26 1993-02-02 Hughes Aircraft Company Phase-locked loop frequency tracking device including a direct digital synthesizer
FR2682841B1 (en) * 1991-10-21 1993-11-19 Alcatel Telspace METHOD FOR DETECTING FALSE SNAPS OF A REFERENCE SIGNAL ON A SIGNAL INITIALLY MODULATED IN MULTIPLE OFFSET DIGITAL MODULATION, METHOD OF COHERENT DIGITAL DEMODULATION USING THE SAME.
US5325401A (en) * 1992-03-13 1994-06-28 Comstream Corporation L-band tuner with quadrature downconverter for PSK data applications
JPH05304467A (en) * 1992-04-24 1993-11-16 Ricoh Co Ltd Oscillator circuit
MA23383A1 (en) * 1993-12-03 1995-07-01 Scientific Atlanta METHOD AND DEVICE FOR LOCATING AND TRACKING A QPSK CARRIER
ES2108631B1 (en) * 1995-03-31 1998-07-01 Alcatel Standard Electrica DATA CLOCK RECOVERER.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354277A (en) * 1979-11-23 1982-10-12 Trw Inc. Signal acquisition system
US4314206A (en) * 1979-12-26 1982-02-02 Motorola Inc. Noise chopper for preventing false locks in a coherent carrier recovery system
US4513448A (en) * 1983-08-12 1985-04-23 The United States Of America As Represented By The Secretary Of The Army Low power radio synthesizer with harmonic identification feature
US4979230A (en) * 1989-12-04 1990-12-18 General Instrument Corporation Up-conversion homodyne receiver for cable television converter with frequency offset to avoid adjacent channel interference
US5222106A (en) * 1990-02-07 1993-06-22 Kokusai Denshin Denwa Kabushiki Kaisha Interference detection and reduction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0962046A4 *

Also Published As

Publication number Publication date
US6148039A (en) 2000-11-14
WO1998035544A2 (en) 1998-08-20
CA2279850A1 (en) 1998-08-20
EP0962046B1 (en) 2003-04-02
TW391114B (en) 2000-05-21
EP0962046A2 (en) 1999-12-08
JP2002501688A (en) 2002-01-15
EP0962046A4 (en) 1999-12-22
AU6027398A (en) 1998-09-08
DE69812914T2 (en) 2004-01-29
DE69812914D1 (en) 2003-05-08

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