CA2069476A1 - An apparatus and method for varying a signal in a transmitter of a transceiver - Google Patents

An apparatus and method for varying a signal in a transmitter of a transceiver

Info

Publication number
CA2069476A1
CA2069476A1 CA 2069476 CA2069476A CA2069476A1 CA 2069476 A1 CA2069476 A1 CA 2069476A1 CA 2069476 CA2069476 CA 2069476 CA 2069476 A CA2069476 A CA 2069476A CA 2069476 A1 CA2069476 A1 CA 2069476A1
Authority
CA
Canada
Prior art keywords
input signal
transfer function
power amplifier
output signal
signal
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 2069476
Other languages
French (fr)
Other versions
CA2069476C (en
Inventor
Stephen Vincent Cahill
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.)
Motorola Solutions 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 CA2069476A1 publication Critical patent/CA2069476A1/en
Application granted granted Critical
Publication of CA2069476C publication Critical patent/CA2069476C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
    • H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
    • H03C3/406—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated using a feedback loop containing mixers or demodulators
    • 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
    • H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • 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
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding

Abstract

An apparatus and method for linearizing the gain of a nonlinear power amplifier (115) in a IDM digital transceiver.
The power amplifier's transfer function describes a relationship between its input signal and output signal. The output signal is selectively demodulated, substantially with existing receiver elements, during the transmit time slot of a TDM time frame. An inverse transfer function is determined from the nominal gain of the power amplifier (115) and the transfer function. A collection value, corresponding to the transfer function and its inverse, is determined in a vector table. The correction value is multiplied with the input signal resulting in an adjusted input signal. The amplified adjusted input signal produces a varied output signal that is linear to relative to the input signal.
CA 2069476 1990-10-24 1991-09-26 An apparatus and method for varying a signal in a transmitter of a transceiver Expired - Fee Related CA2069476C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60254090A 1990-10-24 1990-10-24
US602,540 1990-10-24

Publications (2)

Publication Number Publication Date
CA2069476A1 true CA2069476A1 (en) 1992-04-25
CA2069476C CA2069476C (en) 1996-12-17

Family

ID=24411752

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2069476 Expired - Fee Related CA2069476C (en) 1990-10-24 1991-09-26 An apparatus and method for varying a signal in a transmitter of a transceiver

Country Status (6)

Country Link
JP (1) JPH05503408A (en)
CA (1) CA2069476C (en)
FR (1) FR2669165B1 (en)
GB (1) GB2254973B (en)
MX (1) MX9101738A (en)
WO (1) WO1992008297A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2272133B (en) * 1992-11-02 1996-06-12 Motorola Inc Radio system
US5710981A (en) * 1995-05-23 1998-01-20 Ericsson Inc. Portable radio power control device and method using incrementally degraded received signals
JP3537988B2 (en) * 1997-03-25 2004-06-14 松下電器産業株式会社 Wireless transmitter
US6112059A (en) * 1997-11-12 2000-08-29 Motorola, Inc. Off-channel leakage power monitor apparatus and method
US6141541A (en) * 1997-12-31 2000-10-31 Motorola, Inc. Method, device, phone and base station for providing envelope-following for variable envelope radio frequency signals
GB2345599A (en) * 1998-12-23 2000-07-12 Nokia Mobile Phones Ltd A baseband predistorter for a transmitter with combined downconversion and demodulation in the feedback path
WO2001063791A2 (en) * 2000-02-23 2001-08-30 Scientific Generics Limited Transmitter and receiver circuit
GB2369735B (en) * 2000-12-02 2004-07-14 Roke Manor Research Method of linearising a signal
GB2379109B (en) * 2001-08-21 2005-07-13 Ubinetics Ltd Linearised radio transmitter
EP1499015A1 (en) * 2003-07-17 2005-01-19 Siemens Aktiengesellschaft Circuit and process for linearizing the characteristics of a GSM power amplifier
JP4479931B2 (en) * 2008-03-11 2010-06-09 日本電気株式会社 Communication apparatus, distortion compensation circuit, and distortion compensation method
US8615054B2 (en) * 2010-09-24 2013-12-24 Intel Corporation Close-loop power amplifier pre-distortion correction
EP3396398B1 (en) * 2017-04-27 2020-07-08 Rohde & Schwarz GmbH & Co. KG Signal correction method, system for correcting a measured signal, as well as oscilloscope

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2068850A5 (en) * 1969-10-03 1971-09-03 Cit Alcatel
JPS6110327Y2 (en) * 1980-01-10 1986-04-03
JPS6041821A (en) * 1983-08-18 1985-03-05 Nec Corp Transmission output power controller
EP0378719B1 (en) * 1989-01-18 1994-04-27 Siemens Aktiengesellschaft Digital distortion generator

Also Published As

Publication number Publication date
FR2669165A1 (en) 1992-05-15
FR2669165B1 (en) 1995-07-21
GB9213179D0 (en) 1992-08-12
GB2254973A (en) 1992-10-21
MX9101738A (en) 1992-06-05
WO1992008297A1 (en) 1992-05-14
CA2069476C (en) 1996-12-17
JPH05503408A (en) 1993-06-03
GB2254973B (en) 1995-02-22

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed