DE2244690C3 - - Google Patents
Info
- Publication number
- DE2244690C3 DE2244690C3 DE2244690A DE2244690A DE2244690C3 DE 2244690 C3 DE2244690 C3 DE 2244690C3 DE 2244690 A DE2244690 A DE 2244690A DE 2244690 A DE2244690 A DE 2244690A DE 2244690 C3 DE2244690 C3 DE 2244690C3
- Authority
- DE
- Germany
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
-
- 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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US180289A US3887768A (en) | 1971-09-14 | 1971-09-14 | Signal structures for double side band-quadrature carrier modulation |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2244690A1 DE2244690A1 (de) | 1973-03-22 |
DE2244690B2 DE2244690B2 (de) | 1980-04-17 |
DE2244690C3 true DE2244690C3 (de) | 1987-09-10 |
Family
ID=22659907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2244690A Granted DE2244690B2 (de) | 1971-09-14 | 1972-09-12 | Einrichtung zur Zweiseitenband-Quadraturmodulation |
Country Status (8)
Country | Link |
---|---|
US (1) | US3887768A (de) |
JP (1) | JPS5238689B2 (de) |
AU (1) | AU469013B2 (de) |
CA (1) | CA985376A (de) |
DE (1) | DE2244690B2 (de) |
GB (1) | GB1395804A (de) |
HK (1) | HK63479A (de) |
NL (1) | NL173808C (de) |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988539A (en) * | 1974-09-16 | 1976-10-26 | Hycom Incorporated | Data transmission system using optimal eight-vector signaling scheme |
DE2544124C3 (de) * | 1974-10-04 | 1982-02-25 | CSELT-Centro Studi e Laboratori Telecomunicazioni S.p.A., Torino | Rückkopplungsentzerrer |
US4037049A (en) * | 1974-10-18 | 1977-07-19 | Intertel, Inc. | Modulator and demodulator for data communications network |
US3983485A (en) * | 1975-02-28 | 1976-09-28 | Rixon Inc. | Multi-phase and multi-amplitude level modulator and modulation and demodulation methods |
FR2309089A1 (fr) * | 1975-04-25 | 1976-11-19 | Ibm France | Procede pour synchroniser l'horloge du recepteur d'un systeme de transmission de donnees et dispositif pour mettre en oeuvre le procede |
US3978407A (en) * | 1975-07-23 | 1976-08-31 | Codex Corporation | Fast start-up adaptive equalizer communication system using two data transmission rates |
US4135057A (en) * | 1976-09-07 | 1979-01-16 | Arthur A. Collins, Inc. | High density digital transmission system |
JPS5534001A (en) * | 1978-08-28 | 1980-03-10 | Noda Sangyo Kagaku Kenkyusho | Stabilization of sarcosine oxidase |
DE2913669C2 (de) * | 1979-04-05 | 1981-12-10 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Verfahren zum Erzeugen von Modem-Sendesignalen mit Quadratur-Amplituden-Modulation QAM |
US4271527A (en) * | 1979-08-31 | 1981-06-02 | Paradyne Corporation | Double side band-quadrature carrier modulation signal structures |
US4358853A (en) * | 1981-01-22 | 1982-11-09 | Codex Corporation | Digital modem transmitter |
US4562426A (en) * | 1982-11-08 | 1985-12-31 | Codex Corporation | Symbol coding apparatus |
US4597090A (en) * | 1983-04-14 | 1986-06-24 | Codex Corporation | Block coded modulation system |
DE3314603A1 (de) * | 1983-04-22 | 1984-10-25 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zur digitalen quadraturamplitudenmodulation |
US4546322A (en) * | 1983-08-24 | 1985-10-08 | Reliance Electric Company | Adaptable demodulator for arbitrary amplitude and phase keyed modulation signals |
US4646305A (en) * | 1983-09-26 | 1987-02-24 | Case Communications, Inc. | High speed data modem using multilevel encoding |
US4646326A (en) * | 1983-10-20 | 1987-02-24 | Motorola Inc. | QAM modulator circuit |
US4660213A (en) * | 1983-11-22 | 1987-04-21 | Infinet, Inc. | Signal structure for data communication |
US4630288A (en) * | 1983-12-21 | 1986-12-16 | Motorola Canada Limited | Data transmission with block coding |
US4713817A (en) * | 1985-04-25 | 1987-12-15 | Codex Corporation | Multidimensional, convolutionally coded communication systems |
JPH042797Y2 (de) * | 1985-06-26 | 1992-01-30 | ||
US4660214A (en) * | 1985-08-01 | 1987-04-21 | Infinet, Inc. | QANI Trellis-coded signal structure |
CA1257656A (en) * | 1986-03-03 | 1989-07-18 | American Telephone And Telegraph Company | Suppressed double-sideband communication system |
CA1301864C (en) * | 1987-02-19 | 1992-05-26 | Sadao Takenaka | Multilevel amplitude modulation and demodulation communication system |
US4980687A (en) * | 1988-10-13 | 1990-12-25 | Systron Donner | Digital demodulator |
JPH02217045A (ja) * | 1989-02-17 | 1990-08-29 | Fujitsu Ltd | 信号点配置方式 |
US5159610A (en) * | 1989-05-12 | 1992-10-27 | Codex Corporation | Trellis precoding for modulation systems |
DE3924635C2 (de) * | 1989-07-26 | 1998-11-05 | Asea Brown Boveri | Verfahren zur digitalen Datenübertragung im Vollduplex-Betrieb |
US5048056A (en) * | 1990-06-08 | 1991-09-10 | General Datacomm, Inc. | Method and apparatus for mapping an eight dimensional constellation of a convolutionally coded communication system |
US5113412A (en) * | 1990-06-08 | 1992-05-12 | General Datacomm, Inc. | Method and apparatus for mapping an eight dimensional constellation of a convolutionally coded communication system |
FR2672755B1 (fr) * | 1991-02-12 | 1993-05-07 | Thomson Csf | Procede de codage en binaire des points d'une constellation utilisee dans une modulation multiporteuse de type ofdm. |
CA2144596A1 (en) * | 1994-04-05 | 1995-10-06 | Richard Prodan | Modulator/demodulator using baseband filtering |
FR2854747A1 (fr) * | 2003-05-09 | 2004-11-12 | St Microelectronics Sa | Dispositif et procede d'addition-comparaison-selection- ajustement dans un decodeur |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3614622A (en) * | 1968-04-30 | 1971-10-19 | Codex Corp | Data transmission method and system |
FR2052919B2 (de) * | 1969-06-27 | 1974-06-14 | Ibm France | |
US3619503A (en) * | 1969-11-18 | 1971-11-09 | Int Communications Corp | Phase and amplitude modulated modem |
JPS5038488B1 (de) * | 1970-08-14 | 1975-12-10 |
-
1971
- 1971-09-14 US US180289A patent/US3887768A/en not_active Ceased
-
1972
- 1972-08-15 GB GB3802872A patent/GB1395804A/en not_active Expired
- 1972-09-08 NL NLAANVRAGE7212270,A patent/NL173808C/xx not_active IP Right Cessation
- 1972-09-12 DE DE2244690A patent/DE2244690B2/de active Granted
- 1972-09-13 CA CA151,639A patent/CA985376A/en not_active Expired
- 1972-09-13 AU AU46635/72A patent/AU469013B2/en not_active Expired
- 1972-09-14 JP JP47091881A patent/JPS5238689B2/ja not_active Expired
-
1979
- 1979-09-06 HK HK634/79A patent/HK63479A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NL173808C (nl) | 1987-03-16 |
AU469013B2 (en) | 1976-01-29 |
CA985376A (en) | 1976-03-09 |
DE2244690B2 (de) | 1980-04-17 |
DE2244690A1 (de) | 1973-03-22 |
NL7212270A (de) | 1973-03-16 |
NL173808B (nl) | 1983-10-03 |
JPS4838912A (de) | 1973-06-08 |
AU4663572A (en) | 1974-03-21 |
GB1395804A (en) | 1975-05-29 |
JPS5238689B2 (de) | 1977-09-30 |
US3887768A (en) | 1975-06-03 |
HK63479A (en) | 1979-09-14 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8281 | Inventor (new situation) |
Free format text: FORNEY JUN., GEORGE DAVID GALLAGER, ROBERT GRAY, LEXINGTON, MASS., US |
|
C3 | Grant after two publication steps (3rd publication) |