JPS57131151A - Carrier wave reproducing circuit - Google Patents

Carrier wave reproducing circuit

Info

Publication number
JPS57131151A
JPS57131151A JP56015775A JP1577581A JPS57131151A JP S57131151 A JPS57131151 A JP S57131151A JP 56015775 A JP56015775 A JP 56015775A JP 1577581 A JP1577581 A JP 1577581A JP S57131151 A JPS57131151 A JP S57131151A
Authority
JP
Japan
Prior art keywords
signal
outputs
output
case
circuit
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
JP56015775A
Other languages
Japanese (ja)
Other versions
JPH0379904B2 (en
Inventor
Yasutsune Yoshida
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 JP56015775A priority Critical patent/JPS57131151A/en
Publication of JPS57131151A publication Critical patent/JPS57131151A/en
Publication of JPH0379904B2 publication Critical patent/JPH0379904B2/ja
Granted 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
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers

Landscapes

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

Abstract

PURPOSE:To obtain a carrier wave reproducing circuit of simple constitution, by executing a logical operation between A/D converting outputs of 2 phase detector outputs for orthogonally detecting an orthogonal amplitude modulating signal, and obtaining a control signal of a voltage controlling oscillator. CONSTITUTION:An input signal (16QAM signal) is detected by phase detectors 2, 3, and outputs S1, S2 are obtained. The outputs S1, S2 are A/D-converted to signals of (X1, X2, X3), (Y1, Y2, Y3) by A/D converters 5, 6. In this case, X3 or Y3 shows a phase shift of the signal, and X1 or Y1 shows a quadrant in which the signal is positioned. Accordingly, when the signals X3, Y3 are brought to EX-OR operation by making them pass through an EX-OR circuit 7, ''1'' appears as its output in case of phase rotation in the direction as indicated with an arrow in the figure, and ''0'' appears as its output in case of its reverse direction. An output of the EX-OR circuit 7 controls a voltage controlling oscillator 9 through an LPF8.
JP56015775A 1981-02-06 1981-02-06 Carrier wave reproducing circuit Granted JPS57131151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56015775A JPS57131151A (en) 1981-02-06 1981-02-06 Carrier wave reproducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56015775A JPS57131151A (en) 1981-02-06 1981-02-06 Carrier wave reproducing circuit

Publications (2)

Publication Number Publication Date
JPS57131151A true JPS57131151A (en) 1982-08-13
JPH0379904B2 JPH0379904B2 (en) 1991-12-20

Family

ID=11898182

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56015775A Granted JPS57131151A (en) 1981-02-06 1981-02-06 Carrier wave reproducing circuit

Country Status (1)

Country Link
JP (1) JPS57131151A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108358A2 (en) * 1982-10-30 1984-05-16 Nec Corporation Phase demodulator
EP0118119A2 (en) * 1983-03-04 1984-09-12 Nec Corporation Timing synchronizing circuit
US4546323A (en) * 1982-08-28 1985-10-08 Nec Corporation Quadrature amplitude demodulator comprising a combination of a full-wave rectifying circuit and binary detectors
EP0173298A2 (en) * 1984-08-27 1986-03-05 Nec Corporation Demodulation device for multiphase PSK or multilevel QAM carrier wave
JPS6210950A (en) * 1985-07-08 1987-01-19 Nec Corp Digital radio communication system
JPS63142938A (en) * 1986-11-28 1988-06-15 アメリカン　テレフォン　アンド　テレグラフ　カムパニー Receiver for communication system
JPS63310252A (en) * 1987-06-12 1988-12-19 Fujitsu Ltd Carrier wave regenerating circuit
JPH0334746A (en) * 1989-06-30 1991-02-14 Nec Corp Carrier reproducing circuit
JPH048043A (en) * 1990-04-26 1992-01-13 Nec Corp Digital demodulator
EP0486474A2 (en) 1985-06-29 1992-05-20 Nec Corporation Method for adapting a transversal equalizer, without carrier synchronism
US5134634A (en) * 1989-08-31 1992-07-28 Nec Corporation Multilevel quadrature amplitude demodulator capable of compensating for a quadrature phase deviation of a carrier signal pair
US5341105A (en) * 1991-09-30 1994-08-23 Nec Corporation Quadratore demodulator circuit utilizing automatic frequency control signal and method thereof
WO2003077497A1 (en) * 2002-03-11 2003-09-18 Matsushita Electric Industrial Co., Ltd. Carrier wave reproduction apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55134563A (en) * 1979-04-05 1980-10-20 Nec Corp Offset qpsk phase difference detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55134563A (en) * 1979-04-05 1980-10-20 Nec Corp Offset qpsk phase difference detector

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546323A (en) * 1982-08-28 1985-10-08 Nec Corporation Quadrature amplitude demodulator comprising a combination of a full-wave rectifying circuit and binary detectors
EP0108358A2 (en) * 1982-10-30 1984-05-16 Nec Corporation Phase demodulator
EP0118119A2 (en) * 1983-03-04 1984-09-12 Nec Corporation Timing synchronizing circuit
EP0173298A2 (en) * 1984-08-27 1986-03-05 Nec Corporation Demodulation device for multiphase PSK or multilevel QAM carrier wave
US4620159A (en) * 1984-08-27 1986-10-28 Nec Corporation Demodulator for multiphase PSK or multilevel QAM signals
EP0486474A2 (en) 1985-06-29 1992-05-20 Nec Corporation Method for adapting a transversal equalizer, without carrier synchronism
JPH0515336B2 (en) * 1985-07-08 1993-03-01 Nippon Electric Co
JPS6210950A (en) * 1985-07-08 1987-01-19 Nec Corp Digital radio communication system
JPS63142938A (en) * 1986-11-28 1988-06-15 アメリカン　テレフォン　アンド　テレグラフ　カムパニー Receiver for communication system
JPS63310252A (en) * 1987-06-12 1988-12-19 Fujitsu Ltd Carrier wave regenerating circuit
JPH0334746A (en) * 1989-06-30 1991-02-14 Nec Corp Carrier reproducing circuit
US5134634A (en) * 1989-08-31 1992-07-28 Nec Corporation Multilevel quadrature amplitude demodulator capable of compensating for a quadrature phase deviation of a carrier signal pair
JPH048043A (en) * 1990-04-26 1992-01-13 Nec Corp Digital demodulator
US5341105A (en) * 1991-09-30 1994-08-23 Nec Corporation Quadratore demodulator circuit utilizing automatic frequency control signal and method thereof
WO2003077497A1 (en) * 2002-03-11 2003-09-18 Matsushita Electric Industrial Co., Ltd. Carrier wave reproduction apparatus
US7277502B2 (en) 2002-03-11 2007-10-02 Matsushita Electric Industrial Co., Ltd. Carrier recovery apparatus

Also Published As

Publication number Publication date
JPH0379904B2 (en) 1991-12-20

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