JPS5648734A - Predistorter - Google Patents

Predistorter

Info

Publication number
JPS5648734A
JPS5648734A JP12497879A JP12497879A JPS5648734A JP S5648734 A JPS5648734 A JP S5648734A JP 12497879 A JP12497879 A JP 12497879A JP 12497879 A JP12497879 A JP 12497879A JP S5648734 A JPS5648734 A JP S5648734A
Authority
JP
Japan
Prior art keywords
signal
power amplifier
input
envelope
multiplier
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
JP12497879A
Other languages
Japanese (ja)
Other versions
JPS634374B2 (en
Inventor
Eiji Okamoto
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12497879A priority Critical patent/JPS5648734A/en
Publication of JPS5648734A publication Critical patent/JPS5648734A/en
Publication of JPS634374B2 publication Critical patent/JPS634374B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio

Abstract

PURPOSE:To reduce the distortion of the output signal of a power amplifier by connecting a predistorter, consisting of the 1st and 2nd envelope detectors, 1st and 2nd function generators, multiplier, and phase modulator, to the input side of the power amplifier. CONSTITUTION:An input signal from terminal 201 is inputted to multiplier 204 and envelope detector 204. Detector 204 detects an envelope of signal amplitude and then inputs it to function generator 203. The output signal of generator 203 is multiplied by the input signal at multiplier 204, whose output signal is inputted to modulated-signal input terminals of envelope detector 205 and phase modulator 207. Detector 205 detects the amplitude envelope of the output signal of multiplier 204 and inputs it to function generator 206. The output signal of generator 206 is inputted to the modulating signal input terminal of modulator 207, whose output terminal 208 is connected to the input terminal of the power amplifier with nonlinear input-output characteristics. So that amplitude distortion and phase distortion of the power amplifier will cancel, functions of generators 203 and 206 are selected, reducing the output distortion of the power amplifier.
JP12497879A 1979-09-28 1979-09-28 Predistorter Granted JPS5648734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12497879A JPS5648734A (en) 1979-09-28 1979-09-28 Predistorter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12497879A JPS5648734A (en) 1979-09-28 1979-09-28 Predistorter

Publications (2)

Publication Number Publication Date
JPS5648734A true JPS5648734A (en) 1981-05-02
JPS634374B2 JPS634374B2 (en) 1988-01-28

Family

ID=14898909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12497879A Granted JPS5648734A (en) 1979-09-28 1979-09-28 Predistorter

Country Status (1)

Country Link
JP (1) JPS5648734A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2652470A1 (en) * 1989-09-28 1991-03-29 Alcatel Transmission Method and device for limiting the rise of secondary lobes in a power transmission installation for a digital single carrier having two or four phase states
US5191597A (en) * 1990-01-22 1993-03-02 Telefonaktiebolaget L M Ericsson Method of compensating for non-linearities in an end amplifier incorporated in a radio transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH027365U (en) * 1988-06-29 1990-01-18

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2652470A1 (en) * 1989-09-28 1991-03-29 Alcatel Transmission Method and device for limiting the rise of secondary lobes in a power transmission installation for a digital single carrier having two or four phase states
US5191597A (en) * 1990-01-22 1993-03-02 Telefonaktiebolaget L M Ericsson Method of compensating for non-linearities in an end amplifier incorporated in a radio transmitter

Also Published As

Publication number Publication date
JPS634374B2 (en) 1988-01-28

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