JPS5686559A - Psk modulation system - Google Patents

Psk modulation system

Info

Publication number
JPS5686559A
JPS5686559A JP16350679A JP16350679A JPS5686559A JP S5686559 A JPS5686559 A JP S5686559A JP 16350679 A JP16350679 A JP 16350679A JP 16350679 A JP16350679 A JP 16350679A JP S5686559 A JPS5686559 A JP S5686559A
Authority
JP
Japan
Prior art keywords
circuit
modulation
signal
output
spread
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
JP16350679A
Other languages
Japanese (ja)
Other versions
JPS5837749B2 (en
Inventor
Toshiyuki Hirose
Hiroshi Nakano
Takashi Furumiya
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP54163506A priority Critical patent/JPS5837749B2/en
Publication of JPS5686559A publication Critical patent/JPS5686559A/en
Publication of JPS5837749B2 publication Critical patent/JPS5837749B2/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
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/2057—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases with a separate carrier for each phase state

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 decrease the spread of spectrum, by making symmetrical the phase change in leading and trailing of the modulation signal input, and making the shape of slope arbitrarily. CONSTITUTION:The output of a carrier oscillation section 10 outputting the phase shifted in n-phase, is fed to a carrier gain control circuit 11 maoing AM modulation via a frequency divider 8. The modulation signal 2 is shaped to the trapezodial waveform at a wave shape circuit 14 and fed to the circuit 11. The circuit 11 is controlled with the output of the frequency divider 11, i.e., the carrier gain control signal for AM modluation. The AM-modulated signal is synthesized at an amplitude synthesizer 12 and output via a multiplier 13. Thus, since the modulation input signal is controlled after being shaped into symmetrical trapezoid, the spread of spectrum can be minimized.
JP54163506A 1979-12-18 1979-12-18 PSK modulation method Expired JPS5837749B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54163506A JPS5837749B2 (en) 1979-12-18 1979-12-18 PSK modulation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54163506A JPS5837749B2 (en) 1979-12-18 1979-12-18 PSK modulation method

Publications (2)

Publication Number Publication Date
JPS5686559A true JPS5686559A (en) 1981-07-14
JPS5837749B2 JPS5837749B2 (en) 1983-08-18

Family

ID=15775151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54163506A Expired JPS5837749B2 (en) 1979-12-18 1979-12-18 PSK modulation method

Country Status (1)

Country Link
JP (1) JPS5837749B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059280A1 (en) * 1998-05-14 1999-11-18 Masahichi Kishi Code division multiple access (cdma) transmission system
JP2015220479A (en) * 2014-05-14 2015-12-07 三菱電機株式会社 Low distortion transmitter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS514748A (en) * 1974-06-26 1976-01-16 Hitachi Ltd EREBEETA

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS514748A (en) * 1974-06-26 1976-01-16 Hitachi Ltd EREBEETA

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059280A1 (en) * 1998-05-14 1999-11-18 Masahichi Kishi Code division multiple access (cdma) transmission system
US6888813B1 (en) 1998-05-14 2005-05-03 Masahichi Kishi Code division multiple access (CDMA) transmission system
JP2015220479A (en) * 2014-05-14 2015-12-07 三菱電機株式会社 Low distortion transmitter

Also Published As

Publication number Publication date
JPS5837749B2 (en) 1983-08-18

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