FR2527874B1 - Procede et dispositif de maintien de la synchronisation de trame dans un systeme de transmission en modulation d'amplitude en quadrature - Google Patents

Procede et dispositif de maintien de la synchronisation de trame dans un systeme de transmission en modulation d'amplitude en quadrature

Info

Publication number
FR2527874B1
FR2527874B1 FR8308274A FR8308274A FR2527874B1 FR 2527874 B1 FR2527874 B1 FR 2527874B1 FR 8308274 A FR8308274 A FR 8308274A FR 8308274 A FR8308274 A FR 8308274A FR 2527874 B1 FR2527874 B1 FR 2527874B1
Authority
FR
France
Prior art keywords
transmission system
amplitude modulation
frame synchronization
quadrature amplitude
modulation transmission
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
Application number
FR8308274A
Other languages
English (en)
Other versions
FR2527874A1 (fr
Inventor
Gary Don Martin
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of FR2527874A1 publication Critical patent/FR2527874A1/fr
Application granted granted Critical
Publication of FR2527874B1 publication Critical patent/FR2527874B1/fr
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
    • H04L27/32—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
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3455—Modifications of the signal space to allow the transmission of additional information in order to facilitate carrier recovery at the receiver end, e.g. by transmitting a pilot or by using additional signal points to allow the detection of rotations

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
FR8308274A 1982-05-26 1983-05-19 Procede et dispositif de maintien de la synchronisation de trame dans un systeme de transmission en modulation d'amplitude en quadrature Expired FR2527874B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/382,176 US4494239A (en) 1982-05-26 1982-05-26 Frame synchronization and phase ambiguity resolution in QAM transmission systems

Publications (2)

Publication Number Publication Date
FR2527874A1 FR2527874A1 (fr) 1983-12-02
FR2527874B1 true FR2527874B1 (fr) 1986-10-10

Family

ID=23507838

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8308274A Expired FR2527874B1 (fr) 1982-05-26 1983-05-19 Procede et dispositif de maintien de la synchronisation de trame dans un systeme de transmission en modulation d'amplitude en quadrature

Country Status (6)

Country Link
US (1) US4494239A (fr)
JP (1) JPS5940748A (fr)
CA (1) CA1199974A (fr)
DE (1) DE3318673A1 (fr)
FR (1) FR2527874B1 (fr)
GB (1) GB2120908B (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4583236A (en) * 1983-11-04 1986-04-15 Racal Data Communications Inc. Modified absolute phase detector
US4601044A (en) * 1983-11-04 1986-07-15 Racal Data Communications Inc. Carrier-phase adjustment using absolute phase detector
US4622670A (en) * 1984-12-10 1986-11-11 At&T Bell Laboratories Error-correction coding for multilevel transmission system
US4713817A (en) * 1985-04-25 1987-12-15 Codex Corporation Multidimensional, convolutionally coded communication systems
US4726043A (en) * 1986-11-28 1988-02-16 American Telephone And Telegraph Company Data decision-directed timing and carrier recovery circuits
JPS6455942A (en) * 1987-08-27 1989-03-02 Fujitsu Ltd Multi-value quadrature amplitude modulation demodulation system
SE458895B (sv) * 1987-09-08 1989-05-16 Ericsson Telefon Ab L M Anordning foer att undvika spektrumbreddning vid till- och fraanslag av en saendare
US4924492A (en) * 1988-03-22 1990-05-08 American Telephone And Telegraph Company Method and apparatus for wideband transmission of digital signals between, for example, a telephone central office and customer premises
FR2662889A1 (fr) * 1990-05-31 1991-12-06 Alcatel Transmission Procede et dispositif de levee de l'ambiguuite de phase dans une transmission numerique a demodulation coherente.
US5305352A (en) * 1991-10-31 1994-04-19 At&T Bell Laboratories Coded modulation with unequal error protection
US5241544A (en) * 1991-11-01 1993-08-31 Motorola, Inc. Multi-channel tdm communication system slot phase correction
JP2513116B2 (ja) * 1993-03-19 1996-07-03 日本電気株式会社 位相曖昧度除去回路
US5809083A (en) * 1994-11-23 1998-09-15 At&T Wireless Services, Inc. Differentially encoded pilot word system and method for wireless transmissions of digital data
US7693179B2 (en) * 2002-11-29 2010-04-06 Panasonic Corporation Data transmission apparatus using a constellation rearrangement
US8126089B2 (en) * 2004-09-30 2012-02-28 Alcatel Lucent Method and apparatus for providing frame synchronization in a digital communication system that supports multiple modulation formats
US7616724B2 (en) * 2004-09-30 2009-11-10 Alcatel-Lucent Usa Inc. Method and apparatus for multi-modulation frame synchronization in a digital communication system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341776A (en) * 1964-01-13 1967-09-12 Collins Radio Co Error sensitive binary transmission system wherein four channels are transmitted via one carrier wave
US3619503A (en) * 1969-11-18 1971-11-09 Int Communications Corp Phase and amplitude modulated modem
JPS5034367B1 (fr) * 1971-04-30 1975-11-07
US3736507A (en) * 1971-08-19 1973-05-29 Communications Satellite Co Phase ambiguity resolution for four phase psk communications systems
US3988539A (en) * 1974-09-16 1976-10-26 Hycom Incorporated Data transmission system using optimal eight-vector signaling scheme
US3955141A (en) * 1974-10-18 1976-05-04 Intertel, Inc. Synchronizing circuit for modems in a data communications network
US3978407A (en) * 1975-07-23 1976-08-31 Codex Corporation Fast start-up adaptive equalizer communication system using two data transmission rates
JPS5650652A (en) * 1979-07-31 1981-05-07 Nec Corp Digital signal transmission system via multiphase/ multivalue modulation wave
JPS5643855A (en) * 1979-09-18 1981-04-22 Nec Corp Digital multilevel, multiphase modulation-demodulation system
GB2103456B (en) * 1981-06-22 1985-04-24 Gen Electric Co Plc Digital data transmission systems

Also Published As

Publication number Publication date
JPS5940748A (ja) 1984-03-06
FR2527874A1 (fr) 1983-12-02
US4494239A (en) 1985-01-15
CA1199974A (fr) 1986-01-28
GB2120908B (en) 1986-03-12
GB2120908A (en) 1983-12-07
DE3318673A1 (de) 1983-12-01
GB8314295D0 (en) 1983-06-29

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Legal Events

Date Code Title Description
ST Notification of lapse