GB2263829A - Automatic frequency control by an adaptive filter - Google Patents

Automatic frequency control by an adaptive filter

Info

Publication number
GB2263829A
GB2263829A GB9303663A GB9303663A GB2263829A GB 2263829 A GB2263829 A GB 2263829A GB 9303663 A GB9303663 A GB 9303663A GB 9303663 A GB9303663 A GB 9303663A GB 2263829 A GB2263829 A GB 2263829A
Authority
GB
United Kingdom
Prior art keywords
frequency control
adaptive filter
automatic frequency
adaptive
frequency
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.)
Granted
Application number
GB9303663A
Other versions
GB2263829B (en
GB9303663D0 (en
Inventor
Kevin L Baum
Bruce D Mueller
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of GB9303663D0 publication Critical patent/GB9303663D0/en
Publication of GB2263829A publication Critical patent/GB2263829A/en
Application granted granted Critical
Publication of GB2263829B publication Critical patent/GB2263829B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H03H21/0043—Adaptive algorithms
    • 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
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Feedback Control In General (AREA)
  • Radio Relay Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

The process of the present invention generates an optimum automatic frequence control signal in an apparatus that has a plurality of adaptive algorithms, each adaptive algorithm having a reference signal with an associated frequency dither. The process starts by comparing the performance of each of the plurality of adaptive algorithms. This difference is input to a comparator (6) where it is compared to zero. This delta signal then modifies the numerically controlled oscillator frequency (8). After several iterations, the frequency offset is reduced to substantially zero.
GB9303663A 1991-06-28 1992-05-08 Automatic frequency control by an adaptive filter Expired - Lifetime GB2263829B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72282891A 1991-06-28 1991-06-28
PCT/US1992/003763 WO1993000747A1 (en) 1991-06-28 1992-05-08 Automatic frequency control by an adaptive filter

Publications (3)

Publication Number Publication Date
GB9303663D0 GB9303663D0 (en) 1993-05-05
GB2263829A true GB2263829A (en) 1993-08-04
GB2263829B GB2263829B (en) 1995-07-26

Family

ID=24903558

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9303663A Expired - Lifetime GB2263829B (en) 1991-06-28 1992-05-08 Automatic frequency control by an adaptive filter

Country Status (7)

Country Link
JP (1) JP2830471B2 (en)
KR (1) KR960005386B1 (en)
CA (1) CA2089154C (en)
DE (2) DE4292274C2 (en)
GB (1) GB2263829B (en)
MX (1) MX9203307A (en)
WO (1) WO1993000747A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394071A (en) * 1993-02-19 1995-02-28 Mts Systems Corportion Control network with on-line iteration and adaptive filter
JPH09219693A (en) * 1996-02-09 1997-08-19 Mitsubishi Electric Corp Digital broadcast receiver
JP3556047B2 (en) * 1996-05-22 2004-08-18 三菱電機株式会社 Digital broadcast receiver
KR19990069891A (en) * 1998-02-13 1999-09-06 전주범 Center frequency tracking method using adaptive regression digital filter algorithm
JP3846546B2 (en) * 2000-08-29 2006-11-15 日本電気株式会社 Frequency offset estimator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466108A (en) * 1981-10-06 1984-08-14 Communications Satellite Corporation TDMA/PSK Carrier synchronization without preamble
US4835790A (en) * 1987-06-23 1989-05-30 Nec Corporation Carrier-to-noise detector for digital transmission systems
US4852090A (en) * 1987-02-02 1989-07-25 Motorola, Inc. TDMA communications system with adaptive equalization
US4896336A (en) * 1988-08-29 1990-01-23 Rockwell International Corporation Differential phase-shift keying demodulator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691176A (en) * 1986-03-17 1987-09-01 General Electric Company Adaptive carrier tracking circuit
US5230007A (en) * 1991-06-28 1993-07-20 Motorola, Inc. Method for optimizing an adaptive filter update coefficient

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466108A (en) * 1981-10-06 1984-08-14 Communications Satellite Corporation TDMA/PSK Carrier synchronization without preamble
US4852090A (en) * 1987-02-02 1989-07-25 Motorola, Inc. TDMA communications system with adaptive equalization
US4835790A (en) * 1987-06-23 1989-05-30 Nec Corporation Carrier-to-noise detector for digital transmission systems
US4896336A (en) * 1988-08-29 1990-01-23 Rockwell International Corporation Differential phase-shift keying demodulator

Also Published As

Publication number Publication date
CA2089154C (en) 1999-08-03
JP2830471B2 (en) 1998-12-02
DE4292274C2 (en) 1999-05-27
JPH05508989A (en) 1993-12-09
CA2089154A1 (en) 1992-12-29
KR960005386B1 (en) 1996-04-24
KR930701869A (en) 1993-06-12
MX9203307A (en) 1992-12-01
GB2263829B (en) 1995-07-26
DE4292274T1 (en) 1993-07-15
GB9303663D0 (en) 1993-05-05
WO1993000747A1 (en) 1993-01-07

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20110120 AND 20110126

PE20 Patent expired after termination of 20 years

Expiry date: 20120507