FR2386944A1 - Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales - Google Patents

Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales

Info

Publication number
FR2386944A1
FR2386944A1 FR7711008A FR7711008A FR2386944A1 FR 2386944 A1 FR2386944 A1 FR 2386944A1 FR 7711008 A FR7711008 A FR 7711008A FR 7711008 A FR7711008 A FR 7711008A FR 2386944 A1 FR2386944 A1 FR 2386944A1
Authority
FR
France
Prior art keywords
data transmission
digital data
amplitude
transmission system
input bits
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
FR7711008A
Other languages
English (en)
Other versions
FR2386944B1 (fr
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7711008A priority Critical patent/FR2386944A1/fr
Publication of FR2386944A1 publication Critical patent/FR2386944A1/fr
Application granted granted Critical
Publication of FR2386944B1 publication Critical patent/FR2386944B1/fr
Granted 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
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • 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
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier

Landscapes

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

Abstract

Le système de transmission permet de transmettre des informations numériques à modulation à niveaux multiples dans lequel un train éléments binaires est modulé dans une modulation à 2**n états. Chaque élément binaire, suivant sa valeur 1 ou 0, modifie ou non (ou vice versa) l'état de phase et d'amplitude défini par les éléments binaires qui le précèdent du saut de phase ou d'amplitude représentant sa contribution. La modulation par transition est possible. Des modulateurs et des démodulateurs pour les systèmes de modulation les plus répandus, mais modifiés sont décrits. Le système permet d'éviter tout saut de phase de 180 degrés .
FR7711008A 1977-04-06 1977-04-06 Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales Granted FR2386944A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7711008A FR2386944A1 (fr) 1977-04-06 1977-04-06 Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7711008A FR2386944A1 (fr) 1977-04-06 1977-04-06 Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales

Publications (2)

Publication Number Publication Date
FR2386944A1 true FR2386944A1 (fr) 1978-11-03
FR2386944B1 FR2386944B1 (fr) 1982-11-26

Family

ID=9189315

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7711008A Granted FR2386944A1 (fr) 1977-04-06 1977-04-06 Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales

Country Status (1)

Country Link
FR (1) FR2386944A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819881A1 (de) * 1977-05-06 1978-11-09 Poitevin Jean Pierre Raymond Vorrichtung zur schaetzung bzw. messung der fehlerrate von binaerelementen einer numerischen schaltung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819881A1 (de) * 1977-05-06 1978-11-09 Poitevin Jean Pierre Raymond Vorrichtung zur schaetzung bzw. messung der fehlerrate von binaerelementen einer numerischen schaltung

Also Published As

Publication number Publication date
FR2386944B1 (fr) 1982-11-26

Similar Documents

Publication Publication Date Title
US5311176A (en) Method and apparatus for generating Walsh codes
WO1996042160A3 (fr) Systeme de transmission utilisant un emetteur a modulateur de phase et multiplicateur de frequence
SE7705875L (sv) Flerkanalsystem
KR900007195A (ko) 전력선에 데이터를 전송하기 위한 방법
EP0667695A4 (fr) Systeme d'informations et de communications radio mettant en uvre un systeme de transmission a porteuses multiples et a etalement du spectre.
GB1120975A (en) Data communication system
GB1079928A (en) A data transmission system
CA2120057A1 (fr) Emetteur-recepteur duplex a multiplexage temporel
CA2235330A1 (fr) Procede de transfert de donnees numeriques par des canaux radio perturbes par des parasites, et dispositif pour la reception de donnees numeriques transmises par canaux radio perturbes par des parasites
GB1488435A (en) Multi-line multi-mode modulator
KR850003806A (ko) 작업 기계의 직시 원격제어 방법 및 이 방법을 수행하기 위한 송수신기 어셈블리
US4002834A (en) PCM synchronization and multiplexing system
JPH0553346B2 (fr)
SE310702B (fr)
EP0348968A3 (fr) Modulateur d'amplitude en quadrature à plusieurs niveaux capable de réduire l'amplitude maximale d'un signal modulé en QAM multiniveau indépendamment de la nature du signal (données ou information redondante)
GB1533678A (en) Fsk transmitter having frequency band-limitation
FR2386944A1 (fr) Systemes de transmission d'information numerique a modulation a niveaux multiples a sauts decales
US4525847A (en) QAM encoder
CA2121195A1 (fr) Dispositif et methode de transmission de signaux numeriques a rejet accru des signaux indirects et forme d'onde de transmission de signaux numerique
JPH04196945A (ja) 多値変復調通信方法及びそのシステム
GB1445185A (en) Frequency-differential phase modulation
SE8008904L (sv) Kopplingsanordning for anvendning i en dataoverforingsanleggning
SU527829A1 (ru) "Устройство формировани сигналов многократной модул ции
JPS5725755A (en) Waveform superposed fsk modulator
JPS5647153A (en) Digital phase modulation system

Legal Events

Date Code Title Description
ST Notification of lapse