JPS5660149A - Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation - Google Patents

Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation

Info

Publication number
JPS5660149A
JPS5660149A JP13595879A JP13595879A JPS5660149A JP S5660149 A JPS5660149 A JP S5660149A JP 13595879 A JP13595879 A JP 13595879A JP 13595879 A JP13595879 A JP 13595879A JP S5660149 A JPS5660149 A JP S5660149A
Authority
JP
Japan
Prior art keywords
transmitter
amplitude modulation
modulated signal
output amplifier
signal accompanying
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
JP13595879A
Other languages
Japanese (ja)
Inventor
Masaaki Atobe
Yoshimi Tagashira
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 JP13595879A priority Critical patent/JPS5660149A/en
Publication of JPS5660149A publication Critical patent/JPS5660149A/en
Pending legal-status Critical Current

Links

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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To make it possible to obtain a multiphase multilevel modulating transmitter with a little distortion generation even if a high output amplifier is used in saturation range, by providing a pre-compensating circuit in front of the high-output amplifier of a digital signal transmitter. CONSTITUTION:Four-phase phase modulators 2 and 3 are driven by two sequences of signals S11 and S12, and S21 and S22. Then, high output amplifier 12 is provided at the output side of modulators 2 and 3, and pre-compensating circuit 11 in front of modulators 2 and 3. Since distortion is compensated by compensating circuit 11 even if high-output amplifier 12 is used in the saturation range, so that the transmitter for the multiphase multilevel modulated signal accompanying amplitude modulation with a little distortion generation can be obtained.
JP13595879A 1979-10-23 1979-10-23 Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation Pending JPS5660149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13595879A JPS5660149A (en) 1979-10-23 1979-10-23 Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13595879A JPS5660149A (en) 1979-10-23 1979-10-23 Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation

Publications (1)

Publication Number Publication Date
JPS5660149A true JPS5660149A (en) 1981-05-23

Family

ID=15163812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13595879A Pending JPS5660149A (en) 1979-10-23 1979-10-23 Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation

Country Status (1)

Country Link
JP (1) JPS5660149A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187658A (en) * 1981-05-13 1982-11-18 Sekisui Chem Co Ltd Container for blood inspection
EP0107980A2 (en) * 1982-10-29 1984-05-09 Fujitsu Limited Phase modulation method and apparatus
JP2014099819A (en) * 2012-11-16 2014-05-29 Nippon Telegr & Teleph Corp <Ntt> Radio communication system, transmission device, reception device, and radio communication method
JP2014515226A (en) * 2011-04-14 2014-06-26 アルカテル−ルーセント Method and apparatus for implementing a high-order modulation scheme using a low-order modulator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116205A (en) * 1974-02-26 1975-09-11

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116205A (en) * 1974-02-26 1975-09-11

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187658A (en) * 1981-05-13 1982-11-18 Sekisui Chem Co Ltd Container for blood inspection
JPS6367856B2 (en) * 1981-05-13 1988-12-27 Sekisui Chemical Co Ltd
EP0107980A2 (en) * 1982-10-29 1984-05-09 Fujitsu Limited Phase modulation method and apparatus
JP2014515226A (en) * 2011-04-14 2014-06-26 アルカテル−ルーセント Method and apparatus for implementing a high-order modulation scheme using a low-order modulator
JP2014099819A (en) * 2012-11-16 2014-05-29 Nippon Telegr & Teleph Corp <Ntt> Radio communication system, transmission device, reception device, and radio communication method

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