FR2453560A1 - Procede pour la production de signaux d'emission de modem a modulation d'amplitude en quadrature maq - Google Patents
Procede pour la production de signaux d'emission de modem a modulation d'amplitude en quadrature maqInfo
- Publication number
- FR2453560A1 FR2453560A1 FR8007703A FR8007703A FR2453560A1 FR 2453560 A1 FR2453560 A1 FR 2453560A1 FR 8007703 A FR8007703 A FR 8007703A FR 8007703 A FR8007703 A FR 8007703A FR 2453560 A1 FR2453560 A1 FR 2453560A1
- Authority
- FR
- France
- Prior art keywords
- production
- signals
- transmission signals
- modem transmission
- maq
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
- H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
- H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
- H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
- H04L27/2089—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states with unbalanced quadrature channels
-
- 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
- H04L27/365—Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier)
Abstract
Procédé pour la production de signaux d'émission de modem à modulation MAQ, avec mémorisation sous forme codée numérique de valeurs échantillonnées de signaux élémentaires de filtres passe-bande, pondération desdits signaux élémentaires par des coefficients fonction de l'information à transmettre et production des signaux d'émission de modem par superposition des signaux élémentaires ainsi pondérés. Les signaux d'émission de modem sont produits à partir de signaux élémentaires mémorisés qui, sur le diagramme de phase, ne résultent les uns des autres ni par symétrie par rapport à l'axe phiv = 0 ou phiv = 90 degrés , ni par symétrie ponctuelle. Les autres signaux élémentaires sont produits par pondération avec + ou -1 et/ou lecture directe ou inverse de la mémoire.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2913669A DE2913669C2 (de) | 1979-04-05 | 1979-04-05 | Verfahren zum Erzeugen von Modem-Sendesignalen mit Quadratur-Amplituden-Modulation QAM |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2453560A1 true FR2453560A1 (fr) | 1980-10-31 |
FR2453560B1 FR2453560B1 (fr) | 1984-03-02 |
Family
ID=6067497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8007703A Granted FR2453560A1 (fr) | 1979-04-05 | 1980-04-04 | Procede pour la production de signaux d'emission de modem a modulation d'amplitude en quadrature maq |
Country Status (4)
Country | Link |
---|---|
US (1) | US4327439A (fr) |
DE (1) | DE2913669C2 (fr) |
FR (1) | FR2453560A1 (fr) |
GB (1) | GB2047053B (fr) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403331A (en) * | 1981-05-01 | 1983-09-06 | Microdyne Corporation | Method and apparatus for transmitting data over limited bandwidth channels |
FR2539261B1 (fr) * | 1983-01-07 | 1989-07-13 | Telecommunications Sa | Emetteur pour faisceaux hertziens numeriques a multi-etats |
US4504802A (en) * | 1983-07-27 | 1985-03-12 | Hayes Microcomputer Products, Inc. | Digital PSK modulator for modem |
US4646305A (en) * | 1983-09-26 | 1987-02-24 | Case Communications, Inc. | High speed data modem using multilevel encoding |
US4656646A (en) * | 1984-06-11 | 1987-04-07 | Motorola, Inc. | Serial minimum shift-keyed modem |
NL8402319A (nl) * | 1984-07-23 | 1986-02-17 | Philips Nv | Inrichting voor het genereren van een hoekgemoduleerd draaggolfsignaal van constante amplitude in responsie op datasignalen. |
US4648099A (en) * | 1984-12-17 | 1987-03-03 | Allied Corporation | Digital minimum shift keyed modulator |
US4617535A (en) * | 1985-06-12 | 1986-10-14 | Exar Corporation | PSK digital echo modulator with reduced memory capacity required |
FR2634609B1 (fr) * | 1988-07-22 | 1990-10-05 | Trt Telecom Radio Electr | Dispositif de modulation pour moduler une onde en phase et en amplitude |
JPH02217045A (ja) * | 1989-02-17 | 1990-08-29 | Fujitsu Ltd | 信号点配置方式 |
JP2941331B2 (ja) * | 1990-02-13 | 1999-08-25 | 株式会社日立製作所 | π/4シフトQPSK変調器及びそれを用いた通信装置 |
US5361047A (en) * | 1990-02-13 | 1994-11-01 | Hitachi, Ltd. | PI/4 shift QPSK modulator and communication apparatus used therewith |
JP2968350B2 (ja) * | 1991-01-11 | 1999-10-25 | 三菱電機株式会社 | 直交変調回路 |
US5745527A (en) * | 1993-02-16 | 1998-04-28 | Motorola, Inc. | Encoding method for constellation symbols of an RF transmitter |
US5446423A (en) * | 1994-09-19 | 1995-08-29 | Motorola, Inc. | Digital single sideband modulator and method |
CN102246437A (zh) * | 2008-12-16 | 2011-11-16 | 阿尔卡特朗讯美国公司 | 具有信号星座的通信系统和方法 |
LU93085B1 (en) * | 2016-05-24 | 2017-11-29 | Univ Luxembourg | Data transmission method and device |
US11736320B2 (en) * | 2022-02-14 | 2023-08-22 | Ultralogic 6G, Llc | Multiplexed amplitude-phase modulation for 5G/6G noise mitigation |
Citations (3)
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 |
FR2339291A1 (fr) * | 1976-01-23 | 1977-08-19 | Telecommunications Sa | Procede de transmission d'informations numeriques par modulation de phase d'une onde porteuse |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3925611A (en) * | 1974-08-12 | 1975-12-09 | Bell Telephone Labor Inc | Combined scrambler-encoder for multilevel digital data |
DE2843493C3 (de) * | 1978-10-05 | 1982-02-18 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zum Erzeugen von phasendifferenzmodulierten Datensignalen |
US4247944A (en) * | 1978-11-15 | 1981-01-27 | Ricoh Co., Ltd. | V.29 Constellation detection method and apparatus |
US4271527A (en) * | 1979-08-31 | 1981-06-02 | Paradyne Corporation | Double side band-quadrature carrier modulation signal structures |
-
1979
- 1979-04-05 DE DE2913669A patent/DE2913669C2/de not_active Expired
-
1980
- 1980-04-02 US US06/136,733 patent/US4327439A/en not_active Expired - Lifetime
- 1980-04-03 GB GB8011445A patent/GB2047053B/en not_active Expired
- 1980-04-04 FR FR8007703A patent/FR2453560A1/fr active Granted
Patent Citations (3)
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 |
FR2339291A1 (fr) * | 1976-01-23 | 1977-08-19 | Telecommunications Sa | Procede de transmission d'informations numeriques par modulation de phase d'une onde porteuse |
Non-Patent Citations (1)
Title |
---|
ARCHIV F]R ELEKTRONIK UND ]BERTRAGUNGSTECHNIK, ELECTRONICS AND COMMUNICATION, vol. 31, no. 7/8, juillet/août 1977, Stuttgart (DE) * |
Also Published As
Publication number | Publication date |
---|---|
US4327439A (en) | 1982-04-27 |
GB2047053B (en) | 1984-02-08 |
FR2453560B1 (fr) | 1984-03-02 |
GB2047053A (en) | 1980-11-19 |
DE2913669C2 (de) | 1981-12-10 |
DE2913669A1 (de) | 1980-10-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
CD | Change of name or company name | ||
DL | Decision of the director general to leave to make available licences of right | ||
ST | Notification of lapse |