JPS5672546A - Distortion compensating circuit - Google Patents

Distortion compensating circuit

Info

Publication number
JPS5672546A
JPS5672546A JP14868979A JP14868979A JPS5672546A JP S5672546 A JPS5672546 A JP S5672546A JP 14868979 A JP14868979 A JP 14868979A JP 14868979 A JP14868979 A JP 14868979A JP S5672546 A JPS5672546 A JP S5672546A
Authority
JP
Japan
Prior art keywords
amplitude
signal
phase
variation portion
distortion
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.)
Pending
Application number
JP14868979A
Other languages
Japanese (ja)
Inventor
Hikari Abe
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 JP14868979A priority Critical patent/JPS5672546A/en
Publication of JPS5672546A publication Critical patent/JPS5672546A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To compensate the nonlinear distortion generated in the post-stage, by adding the distortion generating circuit, and controlling the amplitude and phase of the main signal by the relative signal of its output signal and the distortionless input signal. CONSTITUTION:Two rows of quadrivalue signals, whose band has been limited are orthogonally modulated by the modulators 3, 4 in one side. On the other hand, the signals which have been orthogonally modulated by the modulators 5, 6 become signals having distortion by the distortion generating circuit 14 through the amplitude control circuit 13, are compared with the previous reference signal by the comparator 15, and the phase variation portion and the amplitude variation portion are output. The phase variation portion is applied to the phase control circuits 11, 12, and the amplitude variation portion is applied to the amplitude control circuit 13, by which a modulation signal is controlled.
JP14868979A 1979-11-16 1979-11-16 Distortion compensating circuit Pending JPS5672546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14868979A JPS5672546A (en) 1979-11-16 1979-11-16 Distortion compensating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14868979A JPS5672546A (en) 1979-11-16 1979-11-16 Distortion compensating circuit

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP62094949A Division JPS62294336A (en) 1987-04-17 1987-04-17 Distortion compensation circuit

Publications (1)

Publication Number Publication Date
JPS5672546A true JPS5672546A (en) 1981-06-16

Family

ID=15458391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14868979A Pending JPS5672546A (en) 1979-11-16 1979-11-16 Distortion compensating circuit

Country Status (1)

Country Link
JP (1) JPS5672546A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62294336A (en) * 1987-04-17 1987-12-21 Nec Corp Distortion compensation circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62294336A (en) * 1987-04-17 1987-12-21 Nec Corp Distortion compensation circuit
JPH0534858B2 (en) * 1987-04-17 1993-05-25 Nippon Electric Co

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