CA2200387A1 - Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type - Google Patents

Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type

Info

Publication number
CA2200387A1
CA2200387A1 CA002200387A CA2200387A CA2200387A1 CA 2200387 A1 CA2200387 A1 CA 2200387A1 CA 002200387 A CA002200387 A CA 002200387A CA 2200387 A CA2200387 A CA 2200387A CA 2200387 A1 CA2200387 A1 CA 2200387A1
Authority
CA
Canada
Prior art keywords
signal
amplifier
complex
order
demodulated
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
CA002200387A
Other languages
French (fr)
Other versions
CA2200387C (en
Inventor
Jacques Peltier
Gottfried Schnabl
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.)
Airbus DS SAS
Original Assignee
Matra Communication SA
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 Matra Communication SA filed Critical Matra Communication SA
Publication of CA2200387A1 publication Critical patent/CA2200387A1/en
Application granted granted Critical
Publication of CA2200387C publication Critical patent/CA2200387C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3282Acting on the phase and the amplitude of the input signal
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3247Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36Modulator circuits; Transmitter circuits
    • H04L27/366Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
    • H04L27/368Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F2200/00Indexing scheme relating to amplifiers
    • H03F2200/438Separate feedback of amplitude and phase signals being present
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F2201/00Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3233Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion

Abstract

In order to correct nonlinearities of an amplifier (20) which receives a radio signal (d') and produces an amplified radio signal representing an input complex digital signal (m), a predistortion table, associating a value of a predistorted complex digital signal with each value of the input complex digital signal, is stored, and the predistorted complex signal (d) is modulated in order to obtain the radio signal addressed to the amplifier. In an adaptation period, a fraction (r') of the amplified radio signal is demodulated in order to obtain a demodulated complex signal (r) which is compared with the input complex signal, with which the predistorted complex signal modulated in said adaptation period is associated, in order to update the predistortion table. The predistortion table is updated on the basis of mean values calculated from blocks of samples of the input complex signal and of the demodulated complex signal, which are stored in the adaptation period.
CA002200387A 1996-03-22 1997-03-19 Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type Expired - Fee Related CA2200387C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9603617A FR2746564B1 (en) 1996-03-22 1996-03-22 METHOD FOR CORRECTING NON-LINEARITIES OF AN AMPLIFIER, AND RADIO TRANSMITTER IMPLEMENTING SUCH A METHOD
FRFR9603617 1996-03-22

Publications (2)

Publication Number Publication Date
CA2200387A1 true CA2200387A1 (en) 1997-09-22
CA2200387C CA2200387C (en) 2004-06-22

Family

ID=9490462

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002200387A Expired - Fee Related CA2200387C (en) 1996-03-22 1997-03-19 Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type

Country Status (9)

Country Link
US (1) US5903611A (en)
EP (1) EP0797294B1 (en)
JP (1) JPH1032435A (en)
AT (1) ATE213108T1 (en)
AU (1) AU711697B2 (en)
CA (1) CA2200387C (en)
DE (1) DE69710235T2 (en)
FR (1) FR2746564B1 (en)
TW (1) TW332365B (en)

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Also Published As

Publication number Publication date
EP0797294A1 (en) 1997-09-24
US5903611A (en) 1999-05-11
DE69710235D1 (en) 2002-03-21
CA2200387C (en) 2004-06-22
AU711697B2 (en) 1999-10-21
EP0797294B1 (en) 2002-02-06
AU1637297A (en) 1997-09-25
TW332365B (en) 1998-05-21
ATE213108T1 (en) 2002-02-15
DE69710235T2 (en) 2002-09-19
JPH1032435A (en) 1998-02-03
FR2746564B1 (en) 1998-06-05
FR2746564A1 (en) 1997-09-26

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Effective date: 20150319