CA2125489A1 - Timing and Automatic Frequency Control of Digital Receiver Using the Cyclic Properties of a Non-Linear Operation - Google Patents

Timing and Automatic Frequency Control of Digital Receiver Using the Cyclic Properties of a Non-Linear Operation

Info

Publication number
CA2125489A1
CA2125489A1 CA 2125489 CA2125489A CA2125489A1 CA 2125489 A1 CA2125489 A1 CA 2125489A1 CA 2125489 CA2125489 CA 2125489 CA 2125489 A CA2125489 A CA 2125489A CA 2125489 A1 CA2125489 A1 CA 2125489A1
Authority
CA
Canada
Prior art keywords
carrier frequency
component related
phase component
error
symbol timing
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
CA 2125489
Other languages
French (fr)
Other versions
CA2125489C (en
Inventor
Kenneth E. Scott
Michael Kaube
Kiomars Anvari
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.)
Novatel Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2125489A1 publication Critical patent/CA2125489A1/en
Application granted granted Critical
Publication of CA2125489C publication Critical patent/CA2125489C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • 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
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier
    • 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
    • H04L2027/003—Correction of carrier offset at baseband only
    • 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
    • H04L2027/0053—Closed loops
    • H04L2027/0055—Closed loops single phase

Abstract

A technique for correcting the sampling time and carrier frequency error in a receiver for digitally modulated signals.
Discrete-time, complex-valued samples of the incoming signal are fed to a pair of non-linear operators such as correlators. The first correlator provides a signal having a first phase component related to the symbol timing error and a second phase component related to the carrier frequency error. The second correlator provides a signal having a first phase component related to the symbol timing error and a second phase component related to the negative of the carrier frequency error. The phase components are then separated and detected to extract an estimate of the symbol timing error and the carrier frequency error. In the preferred embodiment, the complex-valued samples are frequency-shifted, before being fed to the correlators, so that the phase components of interest appear at zero frequency. The invention satisfactorily demodulates transmitted digital signals in applications, such as cellular time-division multiple access (TDMA), where they are susceptible to multipath fading.
CA002125489A 1991-12-09 1992-12-08 Timing and automatic frequency control of digital receiver using the cyclic properties of a non-linear operation Expired - Lifetime CA2125489C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US804,424 1991-12-09
US07/804,424 US5282228A (en) 1991-12-09 1991-12-09 Timing and automatic frequency control of digital receiver using the cyclic properties of a non-linear operation

Publications (2)

Publication Number Publication Date
CA2125489A1 true CA2125489A1 (en) 1993-06-24
CA2125489C CA2125489C (en) 1998-07-14

Family

ID=25188949

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002125489A Expired - Lifetime CA2125489C (en) 1991-12-09 1992-12-08 Timing and automatic frequency control of digital receiver using the cyclic properties of a non-linear operation

Country Status (4)

Country Link
US (1) US5282228A (en)
EP (1) EP0616745A1 (en)
CA (1) CA2125489C (en)
WO (1) WO1993012601A1 (en)

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US5553076A (en) * 1994-05-02 1996-09-03 Tcsi Corporation Method and apparatus for a wireless local area network
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JP3575883B2 (en) * 1995-09-18 2004-10-13 三菱電機株式会社 Digital demodulator
JP3073919B2 (en) * 1995-12-30 2000-08-07 松下電器産業株式会社 Synchronizer
US5897605A (en) * 1996-03-15 1999-04-27 Sirf Technology, Inc. Spread spectrum receiver with fast signal reacquisition
US6393046B1 (en) 1996-04-25 2002-05-21 Sirf Technology, Inc. Spread spectrum receiver with multi-bit correlator
US5901171A (en) * 1996-03-15 1999-05-04 Sirf Technology, Inc. Triple multiplexing spread spectrum receiver
US6041280A (en) * 1996-03-15 2000-03-21 Sirf Technology, Inc. GPS car navigation system
US6125325A (en) 1996-04-25 2000-09-26 Sirf Technology, Inc. GPS receiver with cross-track hold
US6252863B1 (en) 1996-04-09 2001-06-26 Trimble Navigation Limited Multipath compensation for pseudorange signals
US6198765B1 (en) 1996-04-25 2001-03-06 Sirf Technologies, Inc. Spread spectrum receiver with multi-path correction
US6917644B2 (en) * 1996-04-25 2005-07-12 Sirf Technology, Inc. Spread spectrum receiver with multi-path correction
US6018704A (en) * 1996-04-25 2000-01-25 Sirf Tech Inc GPS receiver
US6047017A (en) * 1996-04-25 2000-04-04 Cahn; Charles R. Spread spectrum receiver with multi-path cancellation
US6002361A (en) * 1996-04-30 1999-12-14 Trimble Navigation Limited Direct integrated approach to multipath signal identification
US5903597A (en) * 1996-05-20 1999-05-11 Trimble Navigation Limited Suppression on multipath signal effects
US5963601A (en) * 1996-05-20 1999-10-05 Trimble Navigation Limited Variable suppression of multipath signal effects
US5729577A (en) * 1996-05-21 1998-03-17 Motorola, Inc. Signal processor with improved efficiency
US5828694A (en) * 1996-07-01 1998-10-27 Trimble Navigation Limited Determination of multipath tracking error
GB9614712D0 (en) * 1996-07-12 1996-09-04 Roke Manor Research Improvements in or relating to radio receivers
US5914981A (en) * 1997-02-24 1999-06-22 At&T Wireless Services Inc. Method to indicate synchronization lock of a remote station with a base station for a discrete multitone spread spectrum communications system
US5943375A (en) * 1997-02-06 1999-08-24 At&T Wireless Services Inc. Method to indicate synchronization lock of a remote station with a base station
WO1998035458A1 (en) * 1997-02-06 1998-08-13 At & T Wireless Services, Inc. Method of synchronizing a remote station with a base station in a discrete multitone spread spectrum communications system
US6633550B1 (en) 1997-02-20 2003-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Radio transceiver on a chip
US6249542B1 (en) 1997-03-28 2001-06-19 Sirf Technology, Inc. Multipath processing for GPS receivers
US6047033A (en) * 1997-05-19 2000-04-04 Motorola, Inc. Apparatus and method for signal timing error detection
EP0969636B1 (en) 1998-06-30 2007-04-25 Lucent Technologies Inc. Tracking carrier timing utilising frequency offset error signal
KR100310294B1 (en) * 1998-08-26 2001-11-15 오길록 Recovery apparatus of decision-directed darrier
US6560298B1 (en) 1999-05-25 2003-05-06 Motorola, Inc. Method and apparatus for concurrent synchronization and improved automatic frequency control in a communication device
FR2799909A1 (en) * 1999-10-13 2001-04-20 Koninkl Philips Electronics Nv FREQUENCY CORRECTION TO RECEPTION IN A PACKET TRANSMISSION SYSTEM
US6282231B1 (en) * 1999-12-14 2001-08-28 Sirf Technology, Inc. Strong signal cancellation to enhance processing of weak spread spectrum signal
US7272175B2 (en) * 2001-08-16 2007-09-18 Dsp Group Inc. Digital phase locked loop
US7076001B2 (en) * 2001-10-16 2006-07-11 Harris Corporation System and method for an in-service decision-directed signal to noise ratio estimator
KR100457925B1 (en) * 2002-11-15 2004-11-18 한국전자통신연구원 A frequency offset calculation method using log transform and linear approximation
US7764749B2 (en) * 2003-05-27 2010-07-27 Nxp B.V. Phase tracking for received signals using adaptive interpolation
US7365680B2 (en) * 2004-02-10 2008-04-29 Sirf Technology, Inc. Location services system that reduces auto-correlation or cross-correlation in weak signals
US7920658B2 (en) * 2005-03-10 2011-04-05 Qualcomm Incorporated Efficient method to compute one shot frequency estimate
FR2969885B1 (en) * 2010-12-23 2013-01-18 St Microelectronics Grenoble 2 QUICK BLACK CHANNEL SEARCH SYSTEM
US8488697B2 (en) 2011-05-06 2013-07-16 Northrop Grumman Systems Corporation Universal timing recovery circuit
US8976907B2 (en) 2013-01-17 2015-03-10 Harris Corporation Bit synchronizer for detecting symbol timing error for high order modulation using a trajectory mid-point rotation and related methods

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US4466108A (en) * 1981-10-06 1984-08-14 Communications Satellite Corporation TDMA/PSK Carrier synchronization without preamble
US5115454A (en) * 1987-05-12 1992-05-19 Kucar Andy D Method and apparatus for carrier synchronization and data detection
JPH0680611B2 (en) * 1987-10-23 1994-10-12 日立金属株式会社 Magnetic core
DE3935911A1 (en) * 1989-10-27 1991-05-02 Deutsche Forsch Luft Raumfahrt METHOD FOR RECEIVING BIT DETECTION OF DIFFERENTIALLY CODED BINARY OR QUATERIAL PSK SIGNALS IN DIFFERENTIALLY COHERENT DEMODULATION

Also Published As

Publication number Publication date
WO1993012601A1 (en) 1993-06-24
EP0616745A1 (en) 1994-09-28
CA2125489C (en) 1998-07-14
US5282228A (en) 1994-01-25

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