DE3855264D1 - QAM Modulator - Google Patents

QAM Modulator

Info

Publication number
DE3855264D1
DE3855264D1 DE3855264T DE3855264T DE3855264D1 DE 3855264 D1 DE3855264 D1 DE 3855264D1 DE 3855264 T DE3855264 T DE 3855264T DE 3855264 T DE3855264 T DE 3855264T DE 3855264 D1 DE3855264 D1 DE 3855264D1
Authority
DE
Germany
Prior art keywords
qam modulator
qam
modulator
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.)
Expired - Fee Related
Application number
DE3855264T
Other languages
English (en)
Other versions
DE3855264T2 (de
Inventor
Sadao Takenaka
Yoshihito Aono
Takanori Iwamatsu
Morihiko Minowa
Yoshimasa Daido
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
Publication of DE3855264D1 publication Critical patent/DE3855264D1/de
Application granted granted Critical
Publication of DE3855264T2 publication Critical patent/DE3855264T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04L27/32—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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/12—Channels characterised by the type of signal the signals being represented by different phase modulations of a single carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
DE3855264T 1987-02-19 1988-02-19 QAM Modulator Expired - Fee Related DE3855264T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3466387 1987-02-19
JP3928487 1987-02-24

Publications (2)

Publication Number Publication Date
DE3855264D1 true DE3855264D1 (de) 1996-06-13
DE3855264T2 DE3855264T2 (de) 1996-10-02

Family

ID=26373495

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3855264T Expired - Fee Related DE3855264T2 (de) 1987-02-19 1988-02-19 QAM Modulator

Country Status (5)

Country Link
US (1) US4860316A (de)
EP (1) EP0283725B1 (de)
KR (1) KR910006121B1 (de)
CA (1) CA1301864C (de)
DE (1) DE3855264T2 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR910009674B1 (ko) * 1987-03-20 1991-11-25 후지쓰 가부시끼가이샤 디지탈 복조장치
JPH02217045A (ja) * 1989-02-17 1990-08-29 Fujitsu Ltd 信号点配置方式
JP2887987B2 (ja) * 1991-10-23 1999-05-10 日本電気株式会社 ディジタル変調回路
EP0642245A1 (de) * 1993-08-31 1995-03-08 Koninklijke Philips Electronics N.V. Digitales Übertragungssystem und -verfahren
US5528195A (en) * 1995-05-09 1996-06-18 Panasonic Technologies, Inc. Selective type quadrature demodulator
US5621762A (en) * 1995-06-12 1997-04-15 Motorola, Inc. Radio with peak power and bandwidth efficient modulation
AUPN455695A0 (en) * 1995-08-01 1995-08-24 Canon Kabushiki Kaisha Qam spread spectrum demodulation system
JP3140974B2 (ja) * 1996-03-31 2001-03-05 富士通株式会社 判定方法及びプリコーダ装置
US20010028630A1 (en) * 1998-11-09 2001-10-11 Doron Burshtein Methods and apparatus for robust and low-complexity QAM modulation
KR100795226B1 (ko) * 2006-06-20 2008-01-17 강릉대학교산학협력단 삼각 형태의 성상도를 이용하는 디지털 신호 변조 방법 및장치
JP5251984B2 (ja) * 2008-09-09 2013-07-31 富士通株式会社 送信機及び送信方法並びに受信機及び受信方法
US10516563B2 (en) 2015-09-25 2019-12-24 Intel IP Corporation Apparatus and a method for generating a radio frequency signal
US10454748B2 (en) 2015-09-25 2019-10-22 Intel IP Corporation Apparatus and a method for generating a radio frequency signal
US11736320B2 (en) * 2022-02-14 2023-08-22 Ultralogic 6G, Llc Multiplexed amplitude-phase modulation for 5G/6G noise mitigation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887768A (en) * 1971-09-14 1975-06-03 Codex Corp Signal structures for double side band-quadrature carrier modulation
US3955141A (en) * 1974-10-18 1976-05-04 Intertel, Inc. Synchronizing circuit for modems in a data communications network
US4247944A (en) * 1978-11-15 1981-01-27 Ricoh Co., Ltd. V.29 Constellation detection method and apparatus
EP0062435A1 (de) * 1981-03-25 1982-10-13 Motorola Information Systems Ltd. Einrichtung zur Erzeugung von neuartigen Signalstrukturen für die Quadraturträger-Modulation
GB2118003B (en) * 1982-02-02 1985-07-31 Racal Milgo Ltd Differential encoder and decoder for transmitting binary data
US4630287A (en) * 1983-12-28 1986-12-16 Paradyne Corporation Secondary channel signalling in a QAM data point constellation
US4675880A (en) * 1985-05-02 1987-06-23 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Antimultipath communication by injecting tone into null in signal spectrum
CA1257664A (en) * 1985-11-21 1989-07-18 Yasuharu Yoshida MULTILEVEL MODULATOR CAPABLE OF PRODUCING A MULTILEVEL QUADRATURE AMPLITUDE MODULATED SIGNAL HAVING (2.SUP.N .alpha.) OUTPUT SIGNAL POINTS
US4730345A (en) * 1986-04-04 1988-03-08 American Telephone And Telegraph Company Vestigial sideband signal decoder

Also Published As

Publication number Publication date
EP0283725A3 (en) 1990-04-25
DE3855264T2 (de) 1996-10-02
EP0283725A2 (de) 1988-09-28
CA1301864C (en) 1992-05-26
EP0283725B1 (de) 1996-05-08
KR880010589A (ko) 1988-10-10
US4860316A (en) 1989-08-22
KR910006121B1 (ko) 1991-08-13

Similar Documents

Publication Publication Date Title
BR8800124A (pt) Dispositivos de conexao
ATA30988A (de) Alpinski
DE3789560D1 (de) Lichtmodulator.
DE3879868D1 (de) Elektrooptischer konverter.
LV10019A (lv) Herbicida sastavs
DE3777485D1 (de) Magneto-elektro-optischer lichtmodulator.
DE3786647D1 (de) Raeumlicher lichtmodulator.
ATA174288A (de) Alpinski
ATA224788A (de) Calcitoninsuppositorien
DE3855264D1 (de) QAM Modulator
DK584288D0 (da) Saerlig fremgangsmaade
FR2614437B1 (fr) Modulateur electro-optique
DE69027889D1 (de) Modulator
IT1224729B (it) Modulatore ottico
DE3855408D1 (de) Einseitenbandmodulator
DE3675783D1 (de) Amplitudenmodulator.
DE3877333D1 (de) Modulationsvorrichtung.
DK314988D0 (da) Saerlig fremgangsmaade
DE3884344D1 (de) Optischer Einseitenbandmodulator.
ATA48687A (de) Guellefass
AT389045B (de) Paraocclusaler loeffel
FI892397A0 (fi) Modulatorer foer immunresponssystemet.
ATA294988A (de) Haecksler
FI892082A0 (fi) Digitalisk modulator.
AT388649B (de) Sportschuh

Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee