JPS55134563A - Offset qpsk phase difference detector - Google Patents

Offset qpsk phase difference detector

Info

Publication number
JPS55134563A
JPS55134563A JP4140779A JP4140779A JPS55134563A JP S55134563 A JPS55134563 A JP S55134563A JP 4140779 A JP4140779 A JP 4140779A JP 4140779 A JP4140779 A JP 4140779A JP S55134563 A JPS55134563 A JP S55134563A
Authority
JP
Japan
Prior art keywords
phase difference
polarity
signal
sign
detection output
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
JP4140779A
Other languages
Japanese (ja)
Other versions
JPS6159579B2 (en
Inventor
Junji Namiki
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 JP4140779A priority Critical patent/JPS55134563A/en
Publication of JPS55134563A publication Critical patent/JPS55134563A/en
Publication of JPS6159579B2 publication Critical patent/JPS6159579B2/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
    • H04L27/18—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
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop

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 price low a unit by detecting a control signal in a base band by providing a switch which alternates the outputs of the 1st and 2nd phase detectors differentiating an in-phase detection output from a cross detection output in polarity. CONSTITUTION:In-phase detection output I and cross detection output Q are inputted from terminals 390 and 391 respectively. Signal I is changed in polarity by the 1st phase difference detector 381 composed of absolute-value circuit 300, polarity discriminator 301, comparator 304, multipliers 308 and 309, and inverter 306 according to F(I,Q)=SIGN(I).(I0-¦I¦)SIGN(Q). Signal Q, on the other hand, is changed in polarity by the 2nd phase difference detector 382 composed of absolute- value circuit 303, polarity discriminator 302, comparator 307, multipliers 310 and 311, and inverter 304 according to F'=(I,Q)=SIGN(Q).(Q0-¦Q¦)SIGN(I). Here, F(I,Q) and F'(I,Q) are alternated by switch 312 by a timing signal from oscillator 313 to output phase difference signal G(I,Q) between a received signal carrier and synchronous-detecting carrier.
JP4140779A 1979-04-05 1979-04-05 Offset qpsk phase difference detector Granted JPS55134563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4140779A JPS55134563A (en) 1979-04-05 1979-04-05 Offset qpsk phase difference detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4140779A JPS55134563A (en) 1979-04-05 1979-04-05 Offset qpsk phase difference detector

Publications (2)

Publication Number Publication Date
JPS55134563A true JPS55134563A (en) 1980-10-20
JPS6159579B2 JPS6159579B2 (en) 1986-12-17

Family

ID=12607499

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4140779A Granted JPS55134563A (en) 1979-04-05 1979-04-05 Offset qpsk phase difference detector

Country Status (1)

Country Link
JP (1) JPS55134563A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57131151A (en) * 1981-02-06 1982-08-13 Nec Corp Carrier wave reproducing circuit
JPS5885658A (en) * 1981-11-12 1983-05-23 シ・エツセ・エ・エレ・チ・セントロ・ステユデイ・エ・ラボラトリ・テレコミニカチオ−ニ・エツセ・ピ−・ア− Circuit for recovering carrier of amplitude and phase modulated signal by digital signal
US5189564A (en) * 1985-06-21 1993-02-23 Nobutaka Amada Magnetic recording/reproducing method and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57131151A (en) * 1981-02-06 1982-08-13 Nec Corp Carrier wave reproducing circuit
JPH0379904B2 (en) * 1981-02-06 1991-12-20 Nippon Electric Co
JPS5885658A (en) * 1981-11-12 1983-05-23 シ・エツセ・エ・エレ・チ・セントロ・ステユデイ・エ・ラボラトリ・テレコミニカチオ−ニ・エツセ・ピ−・ア− Circuit for recovering carrier of amplitude and phase modulated signal by digital signal
US5189564A (en) * 1985-06-21 1993-02-23 Nobutaka Amada Magnetic recording/reproducing method and apparatus

Also Published As

Publication number Publication date
JPS6159579B2 (en) 1986-12-17

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