BR8504717A - Sistema multiplo modulador e sistema multiplo de modulador,em amplitude em quadratura de fase - Google Patents

Sistema multiplo modulador e sistema multiplo de modulador,em amplitude em quadratura de fase

Info

Publication number: BR8504717A
Authority: BR; Brazil
Prior art keywords: modulator system; multiple modulator; amplitude; phase quadrature; quadrature
Prior art date: 1984-09-25

Application number

BR8504717A

Other languages

English (en)

Inventor

Junichi Uchibori

Yutaka Koizumi

Toshihiko Ryu

Original Assignee

Nec Corp

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.)

1984-09-25

Filing date

1985-09-25

Publication date

1986-07-22

1985-09-25 Application filed by Nec Corp filed Critical Nec Corp

1986-07-22 Publication of BR8504717A publication Critical patent/BR8504717A/pt

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
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set

Landscapes

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

BR8504717A 1984-09-25 1985-09-25 Sistema multiplo modulador e sistema multiplo de modulador,em amplitude em quadratura de fase BR8504717A (pt)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
JP59199980A JPS6177452A (ja)	1984-09-25	1984-09-25	多値直交振幅変調方法および装置

Publications (1)

Publication Number	Publication Date
BR8504717A true BR8504717A (pt)	1986-07-22

Family

ID=16416776

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BR8504717A BR8504717A (pt)	1984-09-25	1985-09-25	Sistema multiplo modulador e sistema multiplo de modulador,em amplitude em quadratura de fase

Country Status (7)

Country	Link
US (1)	US4675619A (pt)
EP (1)	EP0176089B1 (pt)
JP (1)	JPS6177452A (pt)
AU (1)	AU572064B2 (pt)
BR (1)	BR8504717A (pt)
CA (1)	CA1251526A (pt)
DE (1)	DE3585480D1 (pt)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4750191A (en) *	1984-11-06	1988-06-07	Nec Corporation	D/A converter capable of producing an analog signal having levels of a preselected number different from 2N and communication network comprising the D/A converter
US4716385A (en) *	1985-07-24	1987-12-29	Nec Corporation	Multilevel modulator comprising a compact error correcting code producing unit
US4721928A (en) *	1985-11-21	1988-01-26	Nec Corporation	Multilevel modulator capable of producing a multilevel quadrature amplitude modulated signal having (2n +α) output signal points
AU589084B2 (en) *	1986-02-08	1989-09-28	Nec Corporation	Multilevel modulator capable of producing a composite modulated signal comprising a quadrature amplitude modulated component and a phase modulated component
JPS6455942A (en) *	1987-08-27	1989-03-02	Fujitsu Ltd	Multi-value quadrature amplitude modulation demodulation system
JP2701280B2 (ja) *	1987-12-30	1998-01-21	日本電気株式会社	有効領域判定信号発生回路
JP2587432B2 (ja) *	1987-10-30	1997-03-05	日本電気株式会社	有効領域判定信号検出回路
JPH0691563B2 (ja) *	1988-10-07	1994-11-14	日本電気株式会社	有効領域判定信号発生回路
US4816783A (en) *	1988-01-11	1989-03-28	Motorola, Inc.	Method and apparatus for quadrature modulation
CA1295700C (en) *	1988-06-10	1992-02-11	Paul Alan Kennard	Method of quadrature-phase amplitude modulation
US4855692A (en) *	1988-06-20	1989-08-08	Northern Telecom Limited	Method of quadrature-phase amplitude modulation
US4910467A (en) *	1988-11-02	1990-03-20	Motorola, Inc.	Method and apparatus for decoding a quadrature modulated signal
US4973977A (en) *	1988-11-29	1990-11-27	Comlux	Digital to amplitude modulated analog converter
US5081649A (en) *	1989-06-01	1992-01-14	Northern Telecom Limited	Method of quadrature-phase amplitude modulation
US4947407A (en) *	1989-08-08	1990-08-07	Siemens-Pacesetter, Inc.	Sample-and-hold digital phase-locked loop for ask signals
JP2809957B2 (ja) *	1993-01-22	1998-10-15	株式会社東芝	ディジタルａｍ送信機
US5517433A (en) *	1994-07-07	1996-05-14	Remote Intelligence, Inc.	Parallel digital data communications
US5673292A (en) *	1994-10-07	1997-09-30	Northrop Grumman Corporation	AM-PSK system for broadcasting a composite analog and digital signal using adaptive M-ary PSK modulation
US5621762A (en) *	1995-06-12	1997-04-15	Motorola, Inc.	Radio with peak power and bandwidth efficient modulation
US6816008B2 (en) *	2002-12-31	2004-11-09	Alion Science And Technology Corporation	Quasi-linear multi-state digital modulation through non-linear amplifier arrays
US7826811B2 (en) *	2005-11-10	2010-11-02	Panasonic Corporation	Phase modulation apparatus and wireless communication apparatus
WO2011068119A1 (ja) *	2009-12-01	2011-06-09	日本電気株式会社	データ伝送方法、データ受信方法、データ変調装置及びデータ復調装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CH609510A5 (pt) *	1976-06-18	1979-02-28	Ibm
US4271527A (en) *	1979-08-31	1981-06-02	Paradyne Corporation	Double side band-quadrature carrier modulation signal structures
US4700349A (en) *	1984-02-06	1987-10-13	Codex Corporation	Coded modulation system

1984
- 1984-09-25 JP JP59199980A patent/JPS6177452A/ja active Pending
1985
- 1985-09-23 US US06/779,217 patent/US4675619A/en not_active Expired - Lifetime
- 1985-09-24 DE DE8585112137T patent/DE3585480D1/de not_active Expired - Lifetime
- 1985-09-24 AU AU47832/85A patent/AU572064B2/en not_active Ceased
- 1985-09-24 CA CA000491461A patent/CA1251526A/en not_active Expired
- 1985-09-24 EP EP85112137A patent/EP0176089B1/en not_active Expired
- 1985-09-25 BR BR8504717A patent/BR8504717A/pt not_active IP Right Cessation

Also Published As

Publication number	Publication date
EP0176089A2 (en)	1986-04-02
US4675619A (en)	1987-06-23
AU4783285A (en)	1986-04-10
EP0176089B1 (en)	1992-03-04
EP0176089A3 (en)	1988-02-03
DE3585480D1 (de)	1992-04-09
AU572064B2 (en)	1988-04-28
CA1251526A (en)	1989-03-21
JPS6177452A (ja)	1986-04-21

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Legal Events

Date	Code	Title	Description
2008-07-15	B21A	Expiry acc. art. 78, item i of ipl- expiry of the term of protection	Free format text: PATENTE EXTINTA EM 25/09/2000