WO2010051179A3 - Rf transmitter and method of operation - Google Patents

Rf transmitter and method of operation Download PDF

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Publication number
WO2010051179A3
WO2010051179A3 PCT/US2009/061219 US2009061219W WO2010051179A3 WO 2010051179 A3 WO2010051179 A3 WO 2010051179A3 US 2009061219 W US2009061219 W US 2009061219W WO 2010051179 A3 WO2010051179 A3 WO 2010051179A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
phase
baseband
apply
low
Prior art date
Application number
PCT/US2009/061219
Other languages
French (fr)
Other versions
WO2010051179A2 (en
Inventor
Lionid Kodner
Genadi Blay
Kalman Kaufman
Avishai A. Yacobi
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 WO2010051179A2 publication Critical patent/WO2010051179A2/en
Publication of WO2010051179A3 publication Critical patent/WO2010051179A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
    • H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0016—Stabilisation of local oscillators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0018—Arrangements at the transmitter end

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

An RF transmitter (100) for transmitting a QAM signal includes a baseband signal generator (101) to produce a baseband modulation signal, a phase shifter (133) to apply a change in phase affecting the baseband signal or a signal derived from it or to mixed with such a signal, a phase shift controller (131) to apply a control signal to control the phase shifter, and an analyzer (126) to analyze the baseband signal to detect low signal periods when a parameter which is a function of amplitude of the signal is not greater than a threshold, the phase shift controller being operable to receive from the analyzer an indication of the low signal periods and to apply the control signal so that the change in phase is applied by the phase shifter only during a selected period when the affected signal has a low power corresponding to a low signal period of the baseband signal.
PCT/US2009/061219 2008-10-31 2009-10-20 Rf transmitter and method of operation WO2010051179A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0819989.5 2008-10-31
GB0819989A GB2464962B (en) 2008-10-31 2008-10-31 RF transmitter and method of operation

Publications (2)

Publication Number Publication Date
WO2010051179A2 WO2010051179A2 (en) 2010-05-06
WO2010051179A3 true WO2010051179A3 (en) 2010-07-22

Family

ID=40138137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/061219 WO2010051179A2 (en) 2008-10-31 2009-10-20 Rf transmitter and method of operation

Country Status (2)

Country Link
GB (1) GB2464962B (en)
WO (1) WO2010051179A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103297380B (en) * 2013-05-15 2016-03-02 中国人民解放军国防科学技术大学 A kind of modulator approach of non-constant power Quadrature Phase Shift Keying signal and modulating device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030193365A1 (en) * 2002-04-15 2003-10-16 The Boeing Company QPSK and 16 QAM self-generating synchronous direct downconversion demodulator
US20060022765A1 (en) * 2004-07-27 2006-02-02 Farag Emad N Modulator and method of modulation
US20070025466A1 (en) * 2004-03-30 2007-02-01 Modesat Communications Ou System and method for transmission and reception of qam signals at low signal to noise ratio

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6731694B2 (en) * 2001-08-07 2004-05-04 Motorola, Inc. Isolator eliminator for a linear transmitter
US20030058959A1 (en) * 2001-09-25 2003-03-27 Caly Networks. Combined digital adaptive pre-distorter and pre-equalizer system for modems in link hopping radio networks
US7382297B1 (en) * 2005-12-08 2008-06-03 Marvell International Ltd. Transmitter I/Q mismatch calibration for low IF design systems
US7860466B2 (en) * 2006-06-04 2010-12-28 Samsung Electro-Mechanics Company, Ltd. Systems, methods, and apparatuses for linear polar transmitters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030193365A1 (en) * 2002-04-15 2003-10-16 The Boeing Company QPSK and 16 QAM self-generating synchronous direct downconversion demodulator
US20070025466A1 (en) * 2004-03-30 2007-02-01 Modesat Communications Ou System and method for transmission and reception of qam signals at low signal to noise ratio
US20060022765A1 (en) * 2004-07-27 2006-02-02 Farag Emad N Modulator and method of modulation

Also Published As

Publication number Publication date
WO2010051179A2 (en) 2010-05-06
GB2464962B (en) 2011-01-26
GB0819989D0 (en) 2008-12-10
GB2464962A (en) 2010-05-05

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