GB2254973A - 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
GB2254973A
GB2254973A GB9213179A GB9213179A GB2254973A GB 2254973 A GB2254973 A GB 2254973A GB 9213179 A GB9213179 A GB 9213179A GB 9213179 A GB9213179 A GB 9213179A GB 2254973 A GB2254973 A GB 2254973A
Authority
GB
United Kingdom
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
GB9213179A
Other versions
GB9213179D0 (en
GB2254973B (en
Inventor
Stephen V 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
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 GB9213179D0 publication Critical patent/GB9213179D0/en
Publication of GB2254973A publication Critical patent/GB2254973A/en
Application granted granted Critical
Publication of GB2254973B publication Critical patent/GB2254973B/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 TDM 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 correction 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 relative to the input signal.
GB9213179A 1990-10-24 1992-06-22 An apparatus and method for varying a signal in a transmitter of a transceiver Expired - Fee Related GB2254973B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60254090A 1990-10-24 1990-10-24
PCT/US1991/007012 WO1992008297A1 (en) 1990-10-24 1991-09-26 An apparatus and method for varying a signal in a transmitter of a transceiver

Publications (3)

Publication Number Publication Date
GB9213179D0 GB9213179D0 (en) 1992-08-12
GB2254973A true GB2254973A (en) 1992-10-21
GB2254973B GB2254973B (en) 1995-02-22

Family

ID=24411752

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9213179A Expired - Fee Related GB2254973B (en) 1990-10-24 1992-06-22 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2331419A (en) * 1997-11-12 1999-05-19 Motorola Inc A transceiver with measurement of transmitter splatter using the receiver
GB2369735A (en) * 2000-12-02 2002-06-05 Roke Manor Research A linearization means for a component (eg an amplifier) in which the inverse transfer function for a predistorter is adjusted in dependence on the I/P and O/P

Families Citing this family (11)

* 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
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
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732496A (en) * 1969-10-03 1973-05-08 Cit Alcatel Radio transmitter-received including means for automatically adjusting the transmission level
US4392245A (en) * 1980-01-10 1983-07-05 Nippon Electric Co., Ltd. Radio transmitter having an output power control circuit
US4563775A (en) * 1983-08-18 1986-01-07 Nec Corporation Apparatus for controlling transmission output power

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE105124T1 (en) * 1989-01-18 1994-05-15 Siemens Ag DIGITAL DISTORTION.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732496A (en) * 1969-10-03 1973-05-08 Cit Alcatel Radio transmitter-received including means for automatically adjusting the transmission level
US4392245A (en) * 1980-01-10 1983-07-05 Nippon Electric Co., Ltd. Radio transmitter having an output power control circuit
US4563775A (en) * 1983-08-18 1986-01-07 Nec Corporation Apparatus for controlling transmission output power

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2331419A (en) * 1997-11-12 1999-05-19 Motorola Inc A transceiver with measurement of transmitter splatter using the receiver
US6112059A (en) * 1997-11-12 2000-08-29 Motorola, Inc. Off-channel leakage power monitor apparatus and method
GB2331419B (en) * 1997-11-12 2002-09-04 Motorola Inc Off-channel leakage power monitor apparatus and method
US6539235B1 (en) 1997-11-12 2003-03-25 Motorola, Inc. Channel leakage power monitor apparatus and method
GB2369735A (en) * 2000-12-02 2002-06-05 Roke Manor Research A linearization means for a component (eg an amplifier) in which the inverse transfer function for a predistorter is adjusted in dependence on the I/P and O/P
GB2369735B (en) * 2000-12-02 2004-07-14 Roke Manor Research Method of linearising a signal

Also Published As

Publication number Publication date
JPH05503408A (en) 1993-06-03
GB9213179D0 (en) 1992-08-12
GB2254973B (en) 1995-02-22
WO1992008297A1 (en) 1992-05-14
FR2669165B1 (en) 1995-07-21
FR2669165A1 (en) 1992-05-15
CA2069476C (en) 1996-12-17
MX9101738A (en) 1992-06-05
CA2069476A1 (en) 1992-04-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010926