WO2007064611A3 - Apparatus and method for amplitude variation reduction of a signal - Google Patents

Apparatus and method for amplitude variation reduction of a signal Download PDF

Info

Publication number
WO2007064611A3
WO2007064611A3 PCT/US2006/045473 US2006045473W WO2007064611A3 WO 2007064611 A3 WO2007064611 A3 WO 2007064611A3 US 2006045473 W US2006045473 W US 2006045473W WO 2007064611 A3 WO2007064611 A3 WO 2007064611A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
phase
base band
limited
limiting
Prior art date
Application number
PCT/US2006/045473
Other languages
French (fr)
Other versions
WO2007064611A2 (en
Inventor
Robin Tingey
Original Assignee
Motorola Inc
Robin Tingey
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, Robin Tingey filed Critical Motorola Inc
Publication of WO2007064611A2 publication Critical patent/WO2007064611A2/en
Publication of WO2007064611A3 publication Critical patent/WO2007064611A3/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/008—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes

Abstract

A transmitter comprises a base band modulator (101) for generating a complex base band signal to be amplified by a power amplifier (103). The complex base band signal is fed to a first limiter (107) which generates a limited signal by limiting the complex base band signal by independently limiting the first real component and the first imaginary component. A first phase rotator (109) then phase rotates the limited signal by a first phase value to generate a phase rotated signal having a second real component and a second imaginary component. The phase rotated signal is then limited by a second limiter (111) by an independent limiting of the second real and second imaginary components. The double limited signal is then optionally phase rotated in a second phase rotator (113) to compensate for the initial phase rotation. The invention may allow improved amplitude limitation with low complexity.
PCT/US2006/045473 2005-11-30 2006-11-28 Apparatus and method for amplitude variation reduction of a signal WO2007064611A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0524392A GB2432981B (en) 2005-11-30 2005-11-30 Apparatus and method for amplitude variation reduction of a signal
GB0524392.8 2005-11-30

Publications (2)

Publication Number Publication Date
WO2007064611A2 WO2007064611A2 (en) 2007-06-07
WO2007064611A3 true WO2007064611A3 (en) 2007-12-06

Family

ID=35601514

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/045473 WO2007064611A2 (en) 2005-11-30 2006-11-28 Apparatus and method for amplitude variation reduction of a signal

Country Status (2)

Country Link
GB (1) GB2432981B (en)
WO (1) WO2007064611A2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870668A (en) * 1995-08-18 1999-02-09 Fujitsu Limited Amplifier having distortion compensation and base station for radio communication using the same
US5926052A (en) * 1996-07-01 1999-07-20 Motorola, Inc. Variable phase shifter and method
US6445239B1 (en) * 1996-07-04 2002-09-03 Siemens Aktiengesellschaft Bus coupling with amplitude-controlled transmission circuit
US20040267860A1 (en) * 2003-06-24 2004-12-30 Motorola, Inc. Complex multiplication method and apparatus with phase rotation
US20050002470A1 (en) * 2003-07-03 2005-01-06 Icefyre Semiconductor Corporation Predistortion circuit for a transmit system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5621762A (en) * 1995-06-12 1997-04-15 Motorola, Inc. Radio with peak power and bandwidth efficient modulation
JP2001069184A (en) * 1999-08-31 2001-03-16 Matsushita Electric Ind Co Ltd Limiter method and limiter device
ES2260076T3 (en) * 2000-12-14 2006-11-01 Sa Car Forni Srl. CONVEYOR BAND FOR TUNNEL OVEN.
GB2377141B (en) * 2001-06-29 2005-03-23 Nokia Corp A transmitter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870668A (en) * 1995-08-18 1999-02-09 Fujitsu Limited Amplifier having distortion compensation and base station for radio communication using the same
US5926052A (en) * 1996-07-01 1999-07-20 Motorola, Inc. Variable phase shifter and method
US6445239B1 (en) * 1996-07-04 2002-09-03 Siemens Aktiengesellschaft Bus coupling with amplitude-controlled transmission circuit
US20040267860A1 (en) * 2003-06-24 2004-12-30 Motorola, Inc. Complex multiplication method and apparatus with phase rotation
US20050002470A1 (en) * 2003-07-03 2005-01-06 Icefyre Semiconductor Corporation Predistortion circuit for a transmit system

Also Published As

Publication number Publication date
GB0524392D0 (en) 2006-01-04
GB2432981A (en) 2007-06-06
GB2432981B (en) 2007-12-27
WO2007064611A2 (en) 2007-06-07

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