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 OperationInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
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.
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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
US804,424 | 1991-12-09 |
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) |
Families Citing this family (46)
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US5588026A (en) * | 1992-06-04 | 1996-12-24 | Kokusai Denshin Denwa Co., Ltd. | Method of compensating phase shift keying frequency offset |
KR960011125B1 (en) * | 1993-01-30 | 1996-08-20 | 삼성전자 주식회사 | Tdma |
US5581579A (en) * | 1993-08-17 | 1996-12-03 | Tcsi Corporation | Method and apparatus to adaptively control the frequency of reception in a digital wireless communication system |
FI96257C (en) * | 1994-04-13 | 1996-05-27 | Nokia Telecommunications Oy | A method for determining the phase error of a radio frequency signal, as well as a receiver |
US5553076A (en) * | 1994-05-02 | 1996-09-03 | Tcsi Corporation | Method and apparatus for a wireless local area network |
JP3116735B2 (en) * | 1994-08-11 | 2000-12-11 | 松下電器産業株式会社 | Automatic frequency correction device |
SE504341C2 (en) * | 1995-05-22 | 1997-01-20 | Ericsson Telefon Ab L M | Method and apparatus for phase modulated signals |
US5646957A (en) * | 1995-07-28 | 1997-07-08 | Lucent Technologies Inc. | Burst update for an adaptive equalizer |
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 |
US6125325A (en) | 1996-04-25 | 2000-09-26 | Sirf Technology, Inc. | GPS receiver with cross-track hold |
US6041280A (en) * | 1996-03-15 | 2000-03-21 | Sirf Technology, Inc. | GPS car navigation system |
US5897605A (en) * | 1996-03-15 | 1999-04-27 | Sirf Technology, Inc. | Spread spectrum receiver with fast signal reacquisition |
US5901171A (en) | 1996-03-15 | 1999-05-04 | Sirf Technology, Inc. | Triple multiplexing spread spectrum receiver |
US6393046B1 (en) | 1996-04-25 | 2002-05-21 | Sirf Technology, Inc. | Spread spectrum receiver with multi-bit correlator |
US6252863B1 (en) | 1996-04-09 | 2001-06-26 | Trimble Navigation Limited | Multipath compensation for pseudorange signals |
US6917644B2 (en) * | 1996-04-25 | 2005-07-12 | Sirf Technology, Inc. | Spread spectrum receiver with multi-path correction |
US6198765B1 (en) | 1996-04-25 | 2001-03-06 | Sirf Technologies, Inc. | Spread spectrum receiver with multi-path correction |
US6047017A (en) * | 1996-04-25 | 2000-04-04 | Cahn; Charles R. | Spread spectrum receiver with multi-path cancellation |
US6018704A (en) * | 1996-04-25 | 2000-01-25 | Sirf Tech Inc | GPS receiver |
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 |
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 |
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 |
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 |
DE69837656T2 (en) | 1998-06-30 | 2007-12-27 | Lucent Technologies Inc. | Carrier tracking system using an error offset frequency 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 |
JP2007511926A (en) * | 2003-05-27 | 2007-05-10 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Phase tracking of 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 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4079329A (en) * | 1976-11-11 | 1978-03-14 | Harris Corporation | Signal demodulator including data normalization |
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 |
-
1991
- 1991-12-09 US US07/804,424 patent/US5282228A/en not_active Expired - Lifetime
-
1992
- 1992-12-08 CA CA002125489A patent/CA2125489C/en not_active Expired - Lifetime
- 1992-12-08 WO PCT/CA1992/000536 patent/WO1993012601A1/en not_active Application Discontinuation
- 1992-12-08 EP EP92924522A patent/EP0616745A1/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
US5282228A (en) | 1994-01-25 |
CA2125489C (en) | 1998-07-14 |
EP0616745A1 (en) | 1994-09-28 |
WO1993012601A1 (en) | 1993-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20121210 |