CA2289133A1 - Frequency selective predistortion in a linear transmitter - Google Patents

Frequency selective predistortion in a linear transmitter Download PDF

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Publication number
CA2289133A1
CA2289133A1 CA002289133A CA2289133A CA2289133A1 CA 2289133 A1 CA2289133 A1 CA 2289133A1 CA 002289133 A CA002289133 A CA 002289133A CA 2289133 A CA2289133 A CA 2289133A CA 2289133 A1 CA2289133 A1 CA 2289133A1
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CA
Canada
Prior art keywords
power amplifier
output signal
predistortion
lut
predistorter
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
CA002289133A
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French (fr)
Other versions
CA2289133C (en
Inventor
Robert R. Lyendecker
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.)
Glenayre Electronics Inc
Original Assignee
Robert R. Lyendecker
Glenayre Electronics, 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 Robert R. Lyendecker, Glenayre Electronics, Inc. filed Critical Robert R. Lyendecker
Publication of CA2289133A1 publication Critical patent/CA2289133A1/en
Application granted granted Critical
Publication of CA2289133C publication Critical patent/CA2289133C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3224—Predistortion being done for compensating memory effects
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3233—Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion

Abstract

A system for linearly transmitting an amplified output signal using predistortion is disclosed. The system uses a straight inverse modeling scheme to more easily and accurately determine the inverse of the distortion caused by a power amplifier (1002) of a RF transmitter. The direct inverse modeling scheme of the present invention indexes the LUT (1020) using the modulated input signals instead of the potentially noisier output signals, which helps to increase the accuracy of the predistortion. The predistorter system (1010) stores complex coefficients in the LUT (1020), which are then used as the tap weights of a digital filter implementing the predistorter (1022). Finally, the trainer (1008) uses a modified version of the power amplifier (1002) output signal. The modified power amplifier (1002) output signal has the in-band distortion removed from the power amplifier (1002) output signal.
CA002289133A 1997-05-07 1998-05-05 Frequency selective predistortion in a linear transmitter Expired - Fee Related CA2289133C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/852,390 1997-05-07
US08/852,390 US5867065A (en) 1997-05-07 1997-05-07 Frequency selective predistortion in a linear transmitter
PCT/US1998/003193 WO1998051005A1 (en) 1997-05-07 1998-05-05 Frequency selective predistortion in a linear transmitter

Publications (2)

Publication Number Publication Date
CA2289133A1 true CA2289133A1 (en) 1998-11-12
CA2289133C CA2289133C (en) 2003-11-11

Family

ID=25313185

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002289133A Expired - Fee Related CA2289133C (en) 1997-05-07 1998-05-05 Frequency selective predistortion in a linear transmitter

Country Status (6)

Country Link
US (1) US5867065A (en)
EP (1) EP0981854A1 (en)
KR (1) KR20010012335A (en)
AU (1) AU7243998A (en)
CA (1) CA2289133C (en)
WO (1) WO1998051005A1 (en)

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Also Published As

Publication number Publication date
EP0981854A1 (en) 2000-03-01
CA2289133C (en) 2003-11-11
US5867065A (en) 1999-02-02
AU7243998A (en) 1998-11-27
WO1998051005A1 (en) 1998-11-12
KR20010012335A (en) 2001-02-15

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