ES2115609T3 - Procedimiento de eliminacion de la tension continua de desfase para un radio-receptor. - Google Patents

Procedimiento de eliminacion de la tension continua de desfase para un radio-receptor.

Info

Publication number
ES2115609T3
ES2115609T3 ES91850216T ES91850216T ES2115609T3 ES 2115609 T3 ES2115609 T3 ES 2115609T3 ES 91850216 T ES91850216 T ES 91850216T ES 91850216 T ES91850216 T ES 91850216T ES 2115609 T3 ES2115609 T3 ES 2115609T3
Authority
ES
Spain
Prior art keywords
signal
received
branch
models
components
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.)
Expired - Lifetime
Application number
ES91850216T
Other languages
English (en)
Inventor
Paul Wilkinson Dent
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of ES2115609T3 publication Critical patent/ES2115609T3/es
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
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of DC offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/007—Demodulation of angle-, frequency- or phase- modulated oscillations by converting the oscillations into two quadrature related signals
    • H03D3/008—Compensating DC offsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0047—Offset of DC voltage or frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0082—Quadrature arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/009—Reduction of local oscillator or RF leakage
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
  • Dc Digital Transmission (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

UN RECEPTOR DE RADIO IF-CERO ELIMINA EL RAMAL DE CD SIN DISTORSION O PERDIDA DE LA BAJA FRECUENCIA Y DE LOS COMPONENTES DE CD DE LA SEÑAL RECIBIDA O DESEADA AL DIFERENCIAR INICIALMENTE LA SEÑAL RECIBIDA PARA FILTRAR EL RAMAL DE CD. LA SEÑAL SE AMPLIFICA A UN NIVEL IDONEO Y SE INTEGRA DESPUES PARA RECAPTURAR LA CD ORIGINAL Y LOS COMPONENTES DE LA SEÑAL DE BAJA FRECUENCIA. LA INTEGRACION RESTABLECE ESENCIALMENTE, LOS COMPONENTES FILTRADOS A SU VALOR ORIGINAL EN LA SEÑAL AMPLIFICADA UTILIZANDO UNA CONSTANTE ARBITRARIA DE INTEGRACION DE MAGNITUD UNIDA PARA GENERAR UNA SEÑAL RESTITUIDA UTILIZANDO VARIAS TECNICAS QUE EXPLOTAN LOS MODELOS DE SEÑALES PREDETERMINADOS O DE LAS CARACTERISTICAS INHERENTES A LAS SEÑALES DE LA SEÑAL DESEADA, EL RAMAL DE CD PODRA ESTIMARSE RAZONABLEMENTE. LA ESTIMACION DEL RAMAL DE CD SE SUSTRAE DESPUES DE LA SEÑAL RESTAURADA DEJANDO LA SEÑAL AMPLIFICADA RECIBIDA SUSTANCIALMENTE LIBRE DE DISTORSIONES. UN METODO VENTAJOSO PARA DIFERENCIAR Y DIGITALIZAR LA SEÑAL RECIBIDA QUE UTILIZA LA TECNICA DE MODULACION DELTA.
ES91850216T 1990-09-06 1991-09-05 Procedimiento de eliminacion de la tension continua de desfase para un radio-receptor. Expired - Lifetime ES2115609T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/578,251 US5241702A (en) 1990-09-06 1990-09-06 D.c. offset compensation in a radio receiver

Publications (1)

Publication Number Publication Date
ES2115609T3 true ES2115609T3 (es) 1998-07-01

Family

ID=24312055

Family Applications (1)

Application Number Title Priority Date Filing Date
ES91850216T Expired - Lifetime ES2115609T3 (es) 1990-09-06 1991-09-05 Procedimiento de eliminacion de la tension continua de desfase para un radio-receptor.

Country Status (11)

Country Link
US (1) US5241702A (es)
EP (1) EP0474615B1 (es)
JP (1) JPH05316158A (es)
AU (1) AU644208B2 (es)
CA (1) CA2050666C (es)
DE (1) DE69128991T2 (es)
ES (1) ES2115609T3 (es)
FI (1) FI108587B (es)
MX (1) MX9100956A (es)
NZ (1) NZ239628A (es)
TW (1) TW201368B (es)

Families Citing this family (108)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241702A (en) * 1990-09-06 1993-08-31 Telefonaktiebolaget L M Ericsson D.c. offset compensation in a radio receiver
GB2267629B (en) * 1992-06-03 1995-10-25 Fujitsu Ltd Signal error reduction in receiving apparatus
GB9211712D0 (en) * 1992-06-03 1992-07-15 Fujitsu Microelectronics Ltd Gm digital receive processing
DE69228816T2 (de) * 1992-10-28 1999-08-19 Alcatel Offsetgleichspannungskorrektur für Direktmisch-TDMA-Empfänger
SE502599C2 (sv) * 1993-09-09 1995-11-20 Ericsson Ge Mobile Communicat Sätt och anordning vid en homodynmottagare för att minimera läckage av störsignaler
US5461340A (en) * 1993-09-11 1995-10-24 Robert Bosch Gmbh Amplitude demodulator for radio receivers to compensate for field strength influence
JP3565281B2 (ja) * 1993-10-08 2004-09-15 ソニー株式会社 受信機
DE4497810B4 (de) * 1993-10-14 2009-10-08 Ericsson - Ge Mobile Communications Inc. Funkempfänder und Verfahren zum Demodulieren sowohl von breitbandigen frequenzmodulieten Signalen, als auch von schmalbandigen frequenzmodulierten Signalen
US5668837A (en) * 1993-10-14 1997-09-16 Ericsson Inc. Dual-mode radio receiver for receiving narrowband and wideband signals
DE4341937A1 (de) * 1993-12-09 1995-06-14 Philips Patentverwaltung Elektrisches Gerät mit einer Anordnung zur Kompensation eines Gleichspannungsanteils
US5708971A (en) * 1994-01-11 1998-01-13 Ericsson Inc. Two-way paging system and apparatus
US5539730A (en) * 1994-01-11 1996-07-23 Ericsson Ge Mobile Communications Inc. TDMA/FDMA/CDMA hybrid radio access methods
US5943324A (en) * 1994-01-11 1999-08-24 Ericsson, Inc. Methods and apparatus for mobile station to mobile station communications in a mobile satellite communication system
ZA95605B (en) * 1994-04-28 1995-12-20 Qualcomm Inc Method and apparatus for automatic gain control and dc offset cancellation in quadrature receiver
US5459679A (en) * 1994-07-18 1995-10-17 Quantum Corporation Real-time DC offset control and associated method
US7904722B2 (en) * 1994-07-19 2011-03-08 Certco, Llc Method for securely using digital signatures in a commercial cryptographic system
US5471665A (en) * 1994-10-18 1995-11-28 Motorola, Inc. Differential DC offset compensation circuit
JPH11501468A (ja) * 1994-12-12 1999-02-02 エリクソン インコーポレイテッド モービル通信システムにおけるダイバーシティ指向型チャネル割当
US5724653A (en) * 1994-12-20 1998-03-03 Lucent Technologies Inc. Radio receiver with DC offset correction circuit
US5579347A (en) * 1994-12-28 1996-11-26 Telefonaktiebolaget Lm Ericsson Digitally compensated direct conversion receiver
US5715281A (en) * 1995-02-21 1998-02-03 Tait Electronics Limited Zero intermediate frequency receiver
US5568520A (en) * 1995-03-09 1996-10-22 Ericsson Inc. Slope drift and offset compensation in zero-IF receivers
US5614904A (en) * 1995-03-09 1997-03-25 Ericsson Inc. Balance companded delta conversion for homodyne receiver
US5715414A (en) * 1995-06-27 1998-02-03 Rohm Co., Ltd. Four-value data wireless signal receiver
JPH0918528A (ja) * 1995-06-27 1997-01-17 Sony Corp 制御信号検出方法及び無線受信装置
US5646569A (en) * 1995-08-30 1997-07-08 Hewlett-Packard Company Method and apparatus for AC coupling
US5862173A (en) * 1995-12-11 1999-01-19 Ericsson Inc. Re-orthogonalization of wideband CDMA signals
GB2310115B (en) * 1996-02-08 2000-06-07 Nokia Mobile Phones Ltd Method and apparatus for dc compensation
US5838735A (en) * 1996-07-08 1998-11-17 Telefonaktiebolaget Lm Ericsson Method and apparatus for compensating for a varying d.c. offset in a sampled signal
US5749051A (en) * 1996-07-18 1998-05-05 Ericsson Inc. Compensation for second order intermodulation in a homodyne receiver
US5896375A (en) * 1996-07-23 1999-04-20 Ericsson Inc. Short-range radio communications system and method of use
US5918169A (en) * 1996-09-25 1999-06-29 Ericsson, Inc. Homodyne cellular base station
US5818872A (en) * 1996-12-31 1998-10-06 Cirrus Logic, Inc. Timing offset error extraction method and apparatus
US6633550B1 (en) * 1997-02-20 2003-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Radio transceiver on a chip
US5852772A (en) * 1997-02-25 1998-12-22 Ericsson Inc. Receiver IF system with active filters
EP0863606B1 (en) * 1997-03-05 2003-09-24 Nec Corporation Direct conversion receiver capable of cancelling DC offset voltages
JP3475037B2 (ja) * 1997-03-14 2003-12-08 株式会社東芝 無線機
US6259904B1 (en) * 1997-10-06 2001-07-10 Motorola, Inc. Fast squelch circuit and method
US6516187B1 (en) 1998-03-13 2003-02-04 Maxim Integrated Products, Inc. DC offset correction for direct conversion tuner IC
US6205183B1 (en) * 1998-05-29 2001-03-20 Ericsson Inc. Methods of suppressing reference oscillator harmonic interference and related receivers
US7065327B1 (en) 1998-09-10 2006-06-20 Intel Corporation Single-chip CMOS direct-conversion transceiver
WO2000039923A1 (en) 1998-12-24 2000-07-06 Telefonaktiebolaget Lm Ericsson (Publ) Communication receiver having reduced dynamic range
US6567475B1 (en) 1998-12-29 2003-05-20 Ericsson Inc. Method and system for the transmission, reception and processing of 4-level and 8-level signaling symbols
SE9900289D0 (sv) 1999-01-27 1999-01-27 Ericsson Telefon Ab L M DC estimate method for a homodyne receiver
GB2346777B (en) * 1999-02-12 2004-04-07 Nokia Mobile Phones Ltd DC offset correction in a direct conversion receiver
US6516185B1 (en) * 1999-05-24 2003-02-04 Level One Communications, Inc. Automatic gain control and offset correction
US6563892B1 (en) 1999-06-15 2003-05-13 Telefonaktiebolaget Lm Ericsson Method and system for detection of binary information in the presence of slowly varying disturbances
US6449320B1 (en) * 1999-07-02 2002-09-10 Telefonaktiebolaget Lm Ericsson (Publ) Equalization with DC-offset compensation
US6370205B1 (en) * 1999-07-02 2002-04-09 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for performing DC-offset compensation in a radio receiver
JP4123320B2 (ja) * 1999-09-17 2008-07-23 ソニー株式会社 受信機およびそのｉｃ
GB2355900B (en) 1999-10-29 2004-03-17 Ericsson Telefon Ab L M Radio receiver
WO2001043122A2 (en) 1999-12-10 2001-06-14 Seagate Technology Llc Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same
US6625236B1 (en) 2000-02-08 2003-09-23 Ericsson Inc. Methods and systems for decoding symbols by combining matched-filtered samples with hard symbol decisions
US6643336B1 (en) * 2000-04-18 2003-11-04 Widcomm, Inc. DC offset and bit timing system and method for use with a wireless transceiver
WO2001082492A1 (fr) 2000-04-26 2001-11-01 Fujitsu Limited Appareil radiorecepteur et systeme de radiocommunications
US6868128B1 (en) 2000-07-05 2005-03-15 Rfmd Wpan, Inc. Method and apparatus for calibrating DC-offsets in a direct conversion receiver
EP1178637A1 (en) 2000-08-04 2002-02-06 Motorola, Inc. Apparatus for reducing DC offset in a direct conversion receiver
GB2366460A (en) * 2000-08-24 2002-03-06 Nokia Mobile Phones Ltd DC compensation for a direct conversion radio receiver
US7068987B2 (en) * 2000-10-02 2006-06-27 Conexant, Inc. Packet acquisition and channel tracking for a wireless communication device configured in a zero intermediate frequency architecture
US6560448B1 (en) * 2000-10-02 2003-05-06 Intersil Americas Inc. DC compensation system for a wireless communication device configured in a zero intermediate frequency architecture
US6735422B1 (en) * 2000-10-02 2004-05-11 Baldwin Keith R Calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency architecture
EP1202511B1 (en) * 2000-10-30 2006-01-11 Texas Instruments France Method for estimating and removing a time-varying DC-offset
US6654593B1 (en) * 2000-10-30 2003-11-25 Research In Motion Limited Combined discrete automatic gain control (AGC) and DC estimation
ATE313166T1 (de) * 2000-10-30 2005-12-15 Texas Instruments Inc Vorrichtung zum ausgleichen des dc-offsets eines quadratur-demodulators , und verfahren dazu
US6907235B2 (en) * 2001-01-02 2005-06-14 Texas Instruments Incorporated Apparatus and method for canceling DC offset in communications signals
US6845126B2 (en) * 2001-01-26 2005-01-18 Telefonaktiebolaget L.M. Ericsson (Publ) System and method for adaptive antenna impedance matching
US6961368B2 (en) * 2001-01-26 2005-11-01 Ericsson Inc. Adaptive antenna optimization network
US7522900B2 (en) * 2001-03-20 2009-04-21 Broadcom Corporation DC offset correction for use in a radio architecture
US6535725B2 (en) * 2001-03-30 2003-03-18 Skyworks Solutions, Inc. Interference reduction for direct conversion receivers
WO2002084859A1 (en) * 2001-04-18 2002-10-24 Nokia Corporation Balanced circuit arrangement and method for linearizing such an arrangement
DE60235601D1 (de) * 2001-09-28 2010-04-22 Nxp Bv Gilbert-Multiplizierer-Zelle Mischer
US7356326B2 (en) * 2001-12-12 2008-04-08 Samsung Electronics Co., Ltd. Direct-conversion receiver for removing DC offset
US7038733B2 (en) * 2002-01-30 2006-05-02 Ericsson Inc. Television receivers and methods for processing signal sample streams synchronously with line/frame patterns
CN100490304C (zh) * 2002-02-01 2009-05-20 Nxp股份有限公司 输入突发信号中包含的加性直流分量检测
GB0206764D0 (en) * 2002-03-22 2002-05-01 Koninkl Philips Electronics Nv DC offset removal in a wireless receiver
US7536165B2 (en) * 2002-07-24 2009-05-19 Nxp B.V. Offset correction for down-conversion mixers
US7190740B2 (en) 2002-08-19 2007-03-13 Siemens Communications, Inc. Arrangement for dynamic DC offset compensation
US7113760B1 (en) 2003-04-29 2006-09-26 Ami Semiconductor, Inc. Direct conversion receiver for amplitude modulated signals using linear/log filtering
US7139546B1 (en) 2003-04-29 2006-11-21 Ami Semiconductor, Inc. Up-conversion of a down-converted baseband signal in a direct conversion architecture without the baseband signal passing through active elements
US7197091B1 (en) 2003-05-06 2007-03-27 Ami Semiconductor, Inc. Direct conversion receiver with direct current offset correction circuitry
US7006809B2 (en) 2003-05-06 2006-02-28 Ami Semiconductor, Inc. Adaptive diversity receiver architecture
US7215722B2 (en) * 2003-06-09 2007-05-08 Ali Corporation Device for WLAN baseband processing with DC offset reduction
US7336938B1 (en) * 2003-06-18 2008-02-26 National Semiconductor Corporation Phase-alternating mixer with alias and harmonic rejection
SE0302156D0 (sv) * 2003-08-01 2003-08-01 Infineon Technologies Ag Low-latency DC compensation
US6909388B1 (en) 2004-06-23 2005-06-21 Microchip Technology Incorporated Fractal sequencing schemes for offset cancellation in sampled data acquisition systems
US20060145853A1 (en) * 2004-12-22 2006-07-06 Time Domain Corporation System and method for detecting objects and communicating information
US7653359B2 (en) * 2006-01-20 2010-01-26 Broadcom Corporation Techniques to decrease fractional spurs for wireless transceivers
US7647026B2 (en) * 2006-02-16 2010-01-12 Broadcom Corporation Receiver architecture for wireless transceiver
US8218693B2 (en) * 2006-03-09 2012-07-10 Broadcom Corporation Gain control for wireless receiver
US8467473B2 (en) * 2006-03-31 2013-06-18 Broadcom Corporation Power control techniques for wireless transmitters
US7933361B2 (en) * 2006-04-05 2011-04-26 Integrated System Solution Corp. Hybrid DC-offset reduction method and system for direct conversion receiver
US7555279B2 (en) * 2006-07-24 2009-06-30 General Dynamics C4 Systems Systems and methods for DC offset correction in a direct conversion RF receiver
US7622987B1 (en) 2007-01-25 2009-11-24 Pmc-Sierra, Inc. Pattern-based DC offset correction
US20090097452A1 (en) * 2007-10-12 2009-04-16 Qualcomm Incorporated Femto cell synchronization and pilot search methodology
US20090149202A1 (en) * 2007-12-07 2009-06-11 Christian Steele System and method for determination of position
US8428186B1 (en) * 2007-12-27 2013-04-23 Exalt Communications Incorporated Decision directed DC offset removal
US8295304B1 (en) 2007-12-27 2012-10-23 Exalt Communications Incorporated Adaptive multi-service data framing
GB0803710D0 (en) * 2008-02-28 2008-04-09 Nokia Corp DC compensation
US8351874B2 (en) * 2008-04-08 2013-01-08 Telefonaktiebolaget Lm Ericsson (Publ) System and method for adaptive antenna impedance matching
US8855580B2 (en) * 2008-06-27 2014-10-07 Telefonaktiebolaget L M Ericsson (Publ) Methods and apparatus for reducing own-transmitter interference in low-IF and zero-IF receivers
US8055234B2 (en) * 2008-06-27 2011-11-08 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatus for suppressing strong-signal interference in low-IF receivers
US7995973B2 (en) * 2008-12-19 2011-08-09 Telefonaktiebolaget Lm Ericsson (Publ) Own transmitter interference tolerant transceiver and receiving methods
US8090320B2 (en) * 2008-12-19 2012-01-03 Telefonaktiebolaget Lm Ericsson (Publ) Strong signal tolerant OFDM receiver and receiving methods
US8611356B2 (en) * 2009-11-13 2013-12-17 Exalt Communications Incorporated Apparatus for ethernet traffic aggregation of radio links
US20110176641A1 (en) 2010-01-20 2011-07-21 St-Ericsson Sa D.C. Offset Estimation
US10763977B2 (en) * 2015-03-09 2020-09-01 Sony Corporation Device and method for determining a DC component
GB201907717D0 (en) * 2019-05-31 2019-07-17 Nordic Semiconductor Asa Apparatus and methods for dc-offset estimation
US12526003B2 (en) 2023-09-19 2026-01-13 Battelle Savannah River Alliance, Llc Systems and methods for removing variable DC offset of periodic analog signals

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922606A (en) * 1974-04-08 1975-11-25 Dicom Systems Adaptive delta modulation information transmission system
US3953805A (en) * 1974-11-07 1976-04-27 Texas Instruments Incorporated DC component suppression in zero CF IF systems
GB1556087A (en) * 1977-12-01 1979-11-21 Standard Telephones Cables Ltd Single channel duplex radio system
AU516022B2 (en) * 1978-09-04 1981-05-14 Western Electric Co. Inc. Differed ial pgm encoder
US4258327A (en) * 1979-07-05 1981-03-24 Rca Corporation Detector circuit with integrating feedback means
NL8000883A (nl) * 1980-02-13 1981-09-16 Philips Nv Coherente ontvanger voor hoekgemoduleerde data signalen.
US4345211A (en) * 1980-09-15 1982-08-17 Rockwell International Corporation Digital phaselock demodulator
US4476585A (en) * 1982-01-25 1984-10-09 International Telephone And Telegraph Corporation Baseband demodulator for FM signals
US4454604A (en) * 1982-04-02 1984-06-12 Motorola Inc. Virtual time base direct synchronizer and method therefor
FR2525055A1 (fr) * 1982-04-09 1983-10-14 Trt Telecom Radio Electr Procede de correction de frequence de la porteuse locale dans le recepteur d'un systeme de transmission de donnees et recepteur utilisant ce procede
DE3346725A1 (de) * 1983-12-23 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart Kompensationsschaltung fuer datenmodulator
FR2564663B1 (fr) * 1984-05-15 1986-09-19 Radiotechnique Demodulateur de frequence a largeur de bande ajustable
US4726069A (en) * 1984-05-18 1988-02-16 Stevenson Carl R A muiti-mode modulation and demodulation system and method
US4731796A (en) * 1984-10-25 1988-03-15 Stc, Plc Multi-mode radio transceiver
US4893316A (en) * 1985-04-04 1990-01-09 Motorola, Inc. Digital radio frequency receiver
DE3516492A1 (de) * 1985-05-08 1986-11-13 Standard Elektrik Lorenz Ag, 7000 Stuttgart Funkempfaenger
GB2175473A (en) * 1985-05-17 1986-11-26 Philips Electronic Associated D.c. block capacitor circuit
GB2193405A (en) * 1986-08-01 1988-02-03 Philips Electronic Associated Demodulating an angle-modulated signal
US4736390A (en) * 1986-10-15 1988-04-05 Itt Avionics, A Division Of Itt Corporation Zero IF radio receiver apparatus
US4811425A (en) * 1987-01-09 1989-03-07 Itt Avionics, A Division Of Itt Corporation Apparatus for reducing the effects of local oscillator leakage in mixers employed in zero IF receivers
EP0324581A3 (en) * 1988-01-13 1990-11-07 Hewlett-Packard Company Calibration of vector demodulator using statistical analysis
GB2215545A (en) * 1988-03-16 1989-09-20 Philips Electronic Associated A direct-conversion receiver
DE3889326D1 (de) * 1988-05-27 1994-06-01 Itt Ind Gmbh Deutsche Korrekturschaltung für ein digitales Quadratur-Signalpaar.
US4944025A (en) * 1988-08-09 1990-07-24 At&E Corporation Direct conversion FM receiver with offset
US4873702A (en) * 1988-10-20 1989-10-10 Chiu Ran Fun Method and apparatus for DC restoration in digital receivers
US4995104A (en) * 1989-05-08 1991-02-19 At&T Bell Laboratories Interference cancelling circuit and method
US5241702A (en) * 1990-09-06 1993-08-31 Telefonaktiebolaget L M Ericsson D.c. offset compensation in a radio receiver
US5140699A (en) * 1990-12-24 1992-08-18 American Nucleonics Corporation Detector DC offset compensator

Also Published As

Publication number Publication date
EP0474615A2 (en) 1992-03-11
HK1009363A1 (en) 1999-05-28
EP0474615B1 (en) 1998-03-04
AU8369691A (en) 1992-03-12
DE69128991D1 (de) 1998-04-09
TW201368B (es) 1993-03-01
EP0474615A3 (en) 1992-10-28
FI108587B (fi) 2002-02-15
FI914165A0 (fi) 1991-09-04
JPH05316158A (ja) 1993-11-26
CA2050666C (en) 2000-11-28
AU644208B2 (en) 1993-12-02
FI914165A7 (fi) 1992-03-07
NZ239628A (en) 1995-03-28
DE69128991T2 (de) 1998-06-18
MX9100956A (es) 1992-05-04
CA2050666A1 (en) 1992-03-07
US5241702A (en) 1993-08-31

Similar Documents

Publication Publication Date Title
ES2115609T3 (es) Procedimiento de eliminacion de la tension continua de desfase para un radio-receptor.
US6606359B1 (en) Area-optimum rapid acquisition cellular multi-protocol digital DC offset correction scheme
NO990064D0 (no) FremgangsmÕte og apparat for kompensering av d.c. forskyvninger i et samplet signal
US7562581B2 (en) Wireless sensor platform for harsh environments
DE69906979D1 (de) Hörhilfegerät mit strahlformungseingeschaften
BR9711599A (pt) Filtro de resposta de impulso finito de base rom para uso em telefone mÄvel
ATE327591T1 (de) Verfahren und system zur quantisierung eines analogen signals mit einem getakteten paar dioden mit resonantem tunneleffekt
DE60319636D1 (de) Verfahren und Vorrichtung zur sicheren Aktivierung eines Funkkommunikationsgeräts aus dem Bereitschaftszustand
MY124366A (en) A method and an apparatus for estimating residual noise in a signal and an apparatus utilizing the method
Towfic et al. Sampling clock jitter estimation and compensation in ADC circuits
MY130838A (en) Searching for signals in a communications system
ATE241227T1 (de) Schaltungsanordnung und verfahren zur offsetkompensation eines signals
ATE179036T1 (de) Empfänger mit automatischer rauschsperre
SE9604644L (sv) Ringdetekteringskrets och -metod för trådlös/trådförbunden sammansatt telefon
GB1248937A (en) A method of and apparatus for translating voice frequency sound signals into a form audible and comprehensible to severely deaf persons
DE60130346D1 (de) Hochempfindliche spreizspektrumempfänger zur schnellen synchronisation
ES2081405T3 (es) Procedimiento y dispositivo para la minimizacion de perturbaciones, especialmente en la recepcion de fm.
DK0995281T3 (da) Datamodtagekredsløb for infrarøde signaler
GB0200496D0 (en) Arrangement and method for radio receiver
US20030100278A1 (en) System and method for reduced deviation time domain FM/PM discriminator to achieve a reduced bandwidth frequency or phase modulation communications channels
US7224909B2 (en) Method and system for selective optical payload cancellation
ATE319230T1 (de) Vorrichtung und verfahren zur gepulsten kabeltelefonie
AR044594A1 (es) Un metodo y sistema de procesamiento de señal digital (dsp) utilizado para compensar variaciones de fase asociadas con la activacion o desactivacion de un amplificador.
JPS5534560A (en) Dividing device
ATE298480T1 (de) Verfahren und schaltungsanordnung zur digitalen rahmensynchronisation

Legal Events

Date Code Title Description
FG2A Definitive protection

Ref document number: 474615

Country of ref document: ES