JPS64845A - Communication system for multilevel amplitude modulating and demodulating system - Google Patents

Communication system for multilevel amplitude modulating and demodulating system

Info

Publication number
JPS64845A
JPS64845A JP63035391A JP3539188A JPS64845A JP S64845 A JPS64845 A JP S64845A JP 63035391 A JP63035391 A JP 63035391A JP 3539188 A JP3539188 A JP 3539188A JP S64845 A JPS64845 A JP S64845A
Authority
JP
Japan
Prior art keywords
signal
data
point arrangement
honeycomb
quadrature
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
JP63035391A
Other languages
Japanese (ja)
Other versions
JPH07112208B2 (en
JPH01845A (en
Inventor
Sadao Takenaka
Yoshitami Aono
Takanori Iwamatsu
Morihiko Minowa
Yoshimasa Ohora
Hiroshi Nakamura
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 JP63035391A priority Critical patent/JPH07112208B2/en
Publication of JPS64845A publication Critical patent/JPS64845A/en
Publication of JPH01845A publication Critical patent/JPH01845A/en
Publication of JPH07112208B2 publication Critical patent/JPH07112208B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE: To increase the multilevel number and to improve the frequency use rate by converting the signal point arrangement of transmission data from a rectangular grating to a honeycomb in a modulator.
CONSTITUTION: The signal point arrangement of in-phase data and quadrature data is converted from a rectangular grating to a honeycomb by a signal point arrangement converting part 101, and data is sent to a transmission line 300 after quadrature amplitude modulation in a quadrature amplitude modulating part 102. A multilevel quadrature amplitude modulated and demodulated QAM is detected by a synchronous detecting part 201 to obtain an in-phase signal Xb and a quadrature signal Yb, and the operation of conversion from rectangular coordinate axes to three coordinate axes connecting signal points adjacent to one another in the honeycomb signal point arrangement is performed by a coordinate transforming part 202 with respect to these signals, and three coordinate transformation output signals X, U, and V corresponding to respective coordinate axes are obtained. Signal points of these output signals X, U, and V are discriminated by a signal discriminating part 203 to output output data corresponing to signal points.
COPYRIGHT: (C)1989,JPO&Japio
JP63035391A 1987-02-19 1988-02-19 Multi-level amplitude modulation / demodulation communication system Expired - Fee Related JPH07112208B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63035391A JPH07112208B2 (en) 1987-02-19 1988-02-19 Multi-level amplitude modulation / demodulation communication system

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP62-34663 1987-02-19
JP3466387 1987-02-19
JP3928487 1987-02-24
JP62-39284 1987-02-24
JP63035391A JPH07112208B2 (en) 1987-02-19 1988-02-19 Multi-level amplitude modulation / demodulation communication system

Publications (3)

Publication Number Publication Date
JPS64845A true JPS64845A (en) 1989-01-05
JPH01845A JPH01845A (en) 1989-01-05
JPH07112208B2 JPH07112208B2 (en) 1995-11-29

Family

ID=27288494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63035391A Expired - Fee Related JPH07112208B2 (en) 1987-02-19 1988-02-19 Multi-level amplitude modulation / demodulation communication system

Country Status (1)

Country Link
JP (1) JPH07112208B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5292226A (en) * 1991-01-25 1994-03-08 Milcon Developments (Nz) Limited Vacuum seal
WO1999041838A1 (en) * 1998-02-13 1999-08-19 Matsushita Electric Industrial Co., Ltd. Oscillation circuit scheme, modulation scheme, demodulation scheme, and multilevel qam modulation/demodulation system
WO2002071715A1 (en) * 2001-03-06 2002-09-12 Matsushita Electric Industrial Co., Ltd. Signal processing apparatus and signal processing method
JP2010093819A (en) * 1997-10-14 2010-04-22 Wi-Lan Inc Method and apparatus for maintaining predefined transmission quality in wireless man network

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652954A (en) * 1979-08-31 1981-05-12 Paradyne Corp Method of marking bothhside banddlinear carrier modulation signal structure
JPS57176867A (en) * 1981-03-25 1982-10-30 Iiesuii Ltd Means for producing qcm signal and receiver for receiving qcm modulatin signal
JPS61112431A (en) * 1984-11-06 1986-05-30 Nec Corp Digital-analog converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652954A (en) * 1979-08-31 1981-05-12 Paradyne Corp Method of marking bothhside banddlinear carrier modulation signal structure
JPS57176867A (en) * 1981-03-25 1982-10-30 Iiesuii Ltd Means for producing qcm signal and receiver for receiving qcm modulatin signal
JPS61112431A (en) * 1984-11-06 1986-05-30 Nec Corp Digital-analog converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5292226A (en) * 1991-01-25 1994-03-08 Milcon Developments (Nz) Limited Vacuum seal
JP2010093819A (en) * 1997-10-14 2010-04-22 Wi-Lan Inc Method and apparatus for maintaining predefined transmission quality in wireless man network
WO1999041838A1 (en) * 1998-02-13 1999-08-19 Matsushita Electric Industrial Co., Ltd. Oscillation circuit scheme, modulation scheme, demodulation scheme, and multilevel qam modulation/demodulation system
WO2002071715A1 (en) * 2001-03-06 2002-09-12 Matsushita Electric Industrial Co., Ltd. Signal processing apparatus and signal processing method

Also Published As

Publication number Publication date
JPH07112208B2 (en) 1995-11-29

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees