DE3588002D1 - QAM Modulator und Demodulator. - Google Patents
QAM Modulator und Demodulator.Info
- Publication number
- DE3588002D1 DE3588002D1 DE3588002T DE3588002T DE3588002D1 DE 3588002 D1 DE3588002 D1 DE 3588002D1 DE 3588002 T DE3588002 T DE 3588002T DE 3588002 T DE3588002 T DE 3588002T DE 3588002 D1 DE3588002 D1 DE 3588002D1
- Authority
- DE
- Germany
- Prior art keywords
- demodulator
- 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
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
- H04L27/3405—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
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/664—Non-linear conversion not otherwise provided for in subgroups of H03M1/66
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Theoretical Computer Science (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Analogue/Digital Conversion (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59233825A JPS61112458A (ja) | 1984-11-06 | 1984-11-06 | 変復調装置 |
JP23382784A JPS61112431A (ja) | 1984-11-06 | 1984-11-06 | Da変換装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3588002D1 true DE3588002D1 (de) | 1995-04-27 |
DE3588002T2 DE3588002T2 (de) | 1995-07-20 |
Family
ID=26531213
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3588126T Expired - Fee Related DE3588126T2 (de) | 1984-11-06 | 1985-11-06 | D/A-Wandler, fähig zur Erzeugung eines analogen Signals mit vorausgewählter, von 2N verschiedener Pegelzahl, und ein mit einem solchen D/A-Wandler versehenes Kommunikationsnetz |
DE3588002T Expired - Fee Related DE3588002T2 (de) | 1984-11-06 | 1985-11-06 | QAM Modulator und Demodulator. |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3588126T Expired - Fee Related DE3588126T2 (de) | 1984-11-06 | 1985-11-06 | D/A-Wandler, fähig zur Erzeugung eines analogen Signals mit vorausgewählter, von 2N verschiedener Pegelzahl, und ein mit einem solchen D/A-Wandler versehenes Kommunikationsnetz |
Country Status (7)
Country | Link |
---|---|
US (1) | US4750191A (de) |
EP (2) | EP0186757B1 (de) |
CN (1) | CN1007951B (de) |
AU (1) | AU588162B2 (de) |
BR (1) | BR8505564A (de) |
CA (1) | CA1282494C (de) |
DE (2) | DE3588126T2 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4721928A (en) | 1985-11-21 | 1988-01-26 | Nec Corporation | Multilevel modulator capable of producing a multilevel quadrature amplitude modulated signal having (2n +α) output signal points |
US4855692A (en) * | 1988-06-20 | 1989-08-08 | Northern Telecom Limited | Method of quadrature-phase amplitude modulation |
US5081649A (en) * | 1989-06-01 | 1992-01-14 | Northern Telecom Limited | Method of quadrature-phase amplitude modulation |
KR0183767B1 (ko) * | 1995-12-14 | 1999-04-15 | 김광호 | 디지탈 데이타 레벨 조정 회로 |
WO2003032594A1 (en) * | 2001-10-08 | 2003-04-17 | Igor Borisovich Dounaev | Information transfer methods |
US7760833B1 (en) | 2005-02-17 | 2010-07-20 | Analog Devices, Inc. | Quadrature demodulation with phase shift |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3389397A (en) * | 1967-03-03 | 1968-06-18 | Leeds & Northrup Co | Analog centesimal recorder having redundant digit |
JPS5493954A (en) * | 1978-01-06 | 1979-07-25 | Hitachi Ltd | Interpolating pcm decoder |
US4271527A (en) * | 1979-08-31 | 1981-06-02 | Paradyne Corporation | Double side band-quadrature carrier modulation signal structures |
US4346368A (en) * | 1979-11-23 | 1982-08-24 | The Boeing Company | Digital-to-analog converter capable of processing a sign magnitude or ones complement binary coded input |
US4484178A (en) * | 1982-06-22 | 1984-11-20 | International Business Machines Corporation | Digital-to-analog converter |
US4534040A (en) * | 1983-01-04 | 1985-08-06 | At&T Information Systems | Method and apparatus for coding a binary signal |
US4520490A (en) * | 1983-08-05 | 1985-05-28 | At&T Information Systems Inc. | Differentially nonlinear convolutional channel coding with expanded set of signalling alphabets |
US4584564A (en) * | 1984-09-24 | 1986-04-22 | Gte Communication Systems Corporation | Residue to analog converter |
JPS6177452A (ja) * | 1984-09-25 | 1986-04-21 | Nec Corp | 多値直交振幅変調方法および装置 |
-
1985
- 1985-11-04 US US06/794,662 patent/US4750191A/en not_active Expired - Lifetime
- 1985-11-05 AU AU49365/85A patent/AU588162B2/en not_active Ceased
- 1985-11-05 CA CA000494589A patent/CA1282494C/en not_active Expired - Fee Related
- 1985-11-06 DE DE3588126T patent/DE3588126T2/de not_active Expired - Fee Related
- 1985-11-06 DE DE3588002T patent/DE3588002T2/de not_active Expired - Fee Related
- 1985-11-06 EP EP85114133A patent/EP0186757B1/de not_active Expired - Lifetime
- 1985-11-06 EP EP93119447A patent/EP0588387B1/de not_active Expired - Lifetime
- 1985-11-06 CN CN85108891A patent/CN1007951B/zh not_active Expired
- 1985-11-06 BR BR8505564A patent/BR8505564A/pt not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US4750191A (en) | 1988-06-07 |
DE3588002T2 (de) | 1995-07-20 |
BR8505564A (pt) | 1986-08-12 |
EP0186757A3 (en) | 1989-01-11 |
DE3588126T2 (de) | 1997-02-13 |
EP0186757A2 (de) | 1986-07-09 |
EP0186757B1 (de) | 1995-03-22 |
EP0588387B1 (de) | 1996-10-09 |
AU4936585A (en) | 1986-05-15 |
CN1007951B (zh) | 1990-05-09 |
AU588162B2 (en) | 1989-09-07 |
CA1282494C (en) | 1991-04-02 |
CN85108891A (zh) | 1986-05-10 |
EP0588387A2 (de) | 1994-03-23 |
EP0588387A3 (de) | 1994-08-31 |
DE3588126D1 (de) | 1996-11-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |