JPS562770A - Carrier wave reproducing circuit - Google Patents

Carrier wave reproducing circuit

Info

Publication number
JPS562770A
JPS562770A JP7876679A JP7876679A JPS562770A JP S562770 A JPS562770 A JP S562770A JP 7876679 A JP7876679 A JP 7876679A JP 7876679 A JP7876679 A JP 7876679A JP S562770 A JPS562770 A JP S562770A
Authority
JP
Japan
Prior art keywords
wave
carrier wave
filter
phase
phase error
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
JP7876679A
Other languages
Japanese (ja)
Other versions
JPS5835429B2 (en
Inventor
Sadao Takenaka
Tadayoshi Kato
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP54078766A priority Critical patent/JPS5835429B2/en
Publication of JPS562770A publication Critical patent/JPS562770A/en
Publication of JPS5835429B2 publication Critical patent/JPS5835429B2/en
Expired 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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
    • H04L27/2276—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals using frequency multiplication or harmonic tracking

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 prevent degradation of the error rate for carrier wave reproducing, by using the phase control signal with a demodulation eye pattern as the maximum to control the center frequency of a narrow band filter and by compensating phase error generated by input fluctuation, temperature change, and so on. CONSTITUTION:4-Phase PSK wave (a) is multiplied by 4 in multiplying circuit MLT to become carrier wave (e) of the quadruple frequency with modulation components eliminated, and this wave (e) is applied to tracking filter TF consisting of mixing circuits MIX1 and MIX2, band pass filter BPF, and voltage control oscillator VCO and is output as carrier wave (f) with needless components and noise components eliminated. The output of filter TF is 1/4-divided by frequency dividing circuit DVD to reproduce carrier wave (q) of the 4-phase PSK wave, and this wave (q) is applied to demodulating circuit DEM where the 4-phase PSK wave is input, and demodulation outputs (b) and (c) are applied to phase error detecting circuits PED. Outputs (b) and (c) are subjected to arithmetic operations in circuit PED to detect phase error, and this detection output (d) is applied to oscillator VCO of filter TF to control the center frequency, thereby compensating phase error.
JP54078766A 1979-06-21 1979-06-21 Carrier regeneration circuit Expired JPS5835429B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54078766A JPS5835429B2 (en) 1979-06-21 1979-06-21 Carrier regeneration circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54078766A JPS5835429B2 (en) 1979-06-21 1979-06-21 Carrier regeneration circuit

Publications (2)

Publication Number Publication Date
JPS562770A true JPS562770A (en) 1981-01-13
JPS5835429B2 JPS5835429B2 (en) 1983-08-02

Family

ID=13671019

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54078766A Expired JPS5835429B2 (en) 1979-06-21 1979-06-21 Carrier regeneration circuit

Country Status (1)

Country Link
JP (1) JPS5835429B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57140057A (en) * 1981-02-24 1982-08-30 Nec Corp Demodulating system for phase displacement modulation signal
US4525676A (en) * 1981-02-24 1985-06-25 Nippon Electric Co., Ltd. PSK Demodulation system having carrier frequency variation compensation
JPS61179642A (en) * 1985-02-04 1986-08-12 Pioneer Electronic Corp Psk demodulaton circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0223234U (en) * 1988-08-01 1990-02-15

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523544A (en) * 1975-06-27 1977-01-12 Kobe Steel Ltd Multipleeelectrode mig welding method
JPS53110357A (en) * 1977-03-08 1978-09-27 Nec Corp Sweep control circuit for carrier reproducing circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523544A (en) * 1975-06-27 1977-01-12 Kobe Steel Ltd Multipleeelectrode mig welding method
JPS53110357A (en) * 1977-03-08 1978-09-27 Nec Corp Sweep control circuit for carrier reproducing circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57140057A (en) * 1981-02-24 1982-08-30 Nec Corp Demodulating system for phase displacement modulation signal
US4525676A (en) * 1981-02-24 1985-06-25 Nippon Electric Co., Ltd. PSK Demodulation system having carrier frequency variation compensation
JPS61179642A (en) * 1985-02-04 1986-08-12 Pioneer Electronic Corp Psk demodulaton circuit

Also Published As

Publication number Publication date
JPS5835429B2 (en) 1983-08-02

Similar Documents

Publication Publication Date Title
JPS54117671A (en) Carrier wave reproducing circuit
RU2119240C1 (en) Method and device for recovering frequency- modulated signal
JPS562770A (en) Carrier wave reproducing circuit
CA2076935A1 (en) Demodulating device
JPH0656970B2 (en) Device for controlling gradient compensation circuit
KR880006911A (en) Direct mixed synchronous receiver
JPS56154860A (en) Detection system for frequency difference signal
EP0129175A3 (en) Equalizer modifying a phase of a gain control signal to carry out equalization
KR950022207A (en) Receiver in Satellite Communication Using El-Band Phase Shift Keying Modulation
JPS57140057A (en) Demodulating system for phase displacement modulation signal
JPH0448031Y2 (en)
JPS6444153A (en) Demodulator
DE3664990D1 (en) Fm radio receiver
KR950016112A (en) Digital Frequency Error Detection / Compensation Method and Circuit in Digital Modulator
JPS57170653A (en) Demodulating equipment
SU1513616A1 (en) Demodulator of phase-modulated signals for transmitting low
SU1109865A1 (en) Device for demodulating amplitude modulated signals
JPS5592062A (en) Carrier reproducing circuit
SU752781A1 (en) Phase-manipulated signal demodulator
JPS57143906A (en) Fm demodulator for composite modulation system
JPS5693461A (en) Carrier wave reproducing circuit
JPS6439881A (en) Processing circuit for video intermediate frequency signal
JPS57124955A (en) Phase locked loop circuit
VILLARREAL et al. Method and apparatus for receiving and tracking phase modulated signals[Patent]
JPS61127210A (en) Am detector