DE69024879D1 - Mehrstufiger Quadratur-Amplitudendemodulator, der imstande ist, die Quadratur-Phasenabweichung eines Trägersignalpaares zu kompensieren - Google Patents
Mehrstufiger Quadratur-Amplitudendemodulator, der imstande ist, die Quadratur-Phasenabweichung eines Trägersignalpaares zu kompensierenInfo
- Publication number
- DE69024879D1 DE69024879D1 DE69024879T DE69024879T DE69024879D1 DE 69024879 D1 DE69024879 D1 DE 69024879D1 DE 69024879 T DE69024879 T DE 69024879T DE 69024879 T DE69024879 T DE 69024879T DE 69024879 D1 DE69024879 D1 DE 69024879D1
- Authority
- DE
- Germany
- Prior art keywords
- compensate
- pair
- carrier signals
- phase deviation
- stage
- 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 - Lifetime
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
- H04L27/38—Demodulator circuits; Receiver circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22570389 | 1989-08-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69024879D1 true DE69024879D1 (de) | 1996-02-29 |
DE69024879T2 DE69024879T2 (de) | 1996-05-30 |
Family
ID=16833477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69024879T Expired - Lifetime DE69024879T2 (de) | 1989-08-31 | 1990-08-30 | Mehrstufiger Quadratur-Amplitudendemodulator, der imstande ist, die Quadratur-Phasenabweichung eines Trägersignalpaares zu kompensieren |
Country Status (4)
Country | Link |
---|---|
US (1) | US5134634A (de) |
EP (1) | EP0415406B1 (de) |
AU (1) | AU627065B2 (de) |
DE (1) | DE69024879T2 (de) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4306880C1 (de) * | 1993-03-05 | 1994-06-16 | Ant Nachrichtentech | QAM-Empfänger mit Schaltungsmitteln zur Korrektur eines Senderquadraturfehlers |
DE4306881C1 (de) * | 1993-03-05 | 1994-06-16 | Ant Nachrichtentech | QAM-Empfänger mit Schaltungsmitteln zur Korrektur eines Empfängerquadraturfehlers |
US5400363A (en) * | 1993-05-07 | 1995-03-21 | Loral Aerospace Corp. | Quadrature compensation for orthogonal signal channels |
JP3074103B2 (ja) * | 1993-11-16 | 2000-08-07 | 株式会社東芝 | Ofdm同期復調回路 |
US5588022A (en) * | 1994-03-07 | 1996-12-24 | Xetron Corp. | Method and apparatus for AM compatible digital broadcasting |
WO1995028042A1 (en) * | 1994-04-12 | 1995-10-19 | Philips Electronics N.V. | Heterodyne receiver having low intermediate frequency |
SE502813C2 (sv) * | 1994-05-04 | 1996-01-22 | Ericsson Telefon Ab L M | Metod och anordning vid analog-digitalomvandlare |
US5606579A (en) * | 1994-05-23 | 1997-02-25 | Samsung Electronics Co., Ltd. | Digital VSB detector with final IF carrier at submultiple of symbol rate, as for HDTV receiver |
US5675590A (en) * | 1994-11-23 | 1997-10-07 | At&T Wireless Services, Inc. | Cyclic trellis coded modulation |
US5659578A (en) * | 1994-11-23 | 1997-08-19 | At&T Wireless Services, Inc. | High rate Reed-Solomon concatenated trellis coded 16 star QAM system for transmission of data over cellular mobile radio |
US6889356B1 (en) | 1994-11-23 | 2005-05-03 | Cingular Wireless Ii, Llc | Cyclic trellis coded modulation |
US5528195A (en) * | 1995-05-09 | 1996-06-18 | Panasonic Technologies, Inc. | Selective type quadrature demodulator |
US5687163A (en) * | 1995-06-07 | 1997-11-11 | Cirrus Logic, Inc. | Method and apparatus for signal classification using I/Q quadrant histogram |
EP0992109A2 (de) * | 1998-04-28 | 2000-04-12 | Koninklijke Philips Electronics N.V. | Vereinfachter empfänger für fsk signale |
US6292511B1 (en) * | 1998-10-02 | 2001-09-18 | Usa Digital Radio Partners, Lp | Method for equalization of complementary carriers in an AM compatible digital audio broadcast system |
US6295317B1 (en) | 1998-10-02 | 2001-09-25 | Usa Digital Radio Partners, Lp | Method and apparatus for demodulating and equalizing an AM compatible digital audio broadcast signal |
US6259893B1 (en) | 1998-11-03 | 2001-07-10 | Ibiquity Digital Corporation | Method and apparatus for reduction of FM interference for FM in-band on-channel digital audio broadcasting system |
US6377620B1 (en) * | 1999-01-19 | 2002-04-23 | Interdigital Technology Corporation | Balancing amplitude and phase |
CN100508508C (zh) * | 1999-01-19 | 2009-07-01 | 交互数字技术公司 | 相移键控接收机中振幅和相位不平衡的校正方法及相应信号平衡器 |
US6721337B1 (en) | 1999-08-24 | 2004-04-13 | Ibiquity Digital Corporation | Method and apparatus for transmission and reception of compressed audio frames with prioritized messages for digital audio broadcasting |
US6549544B1 (en) * | 1999-11-10 | 2003-04-15 | Ibiquity Digital Corporation | Method and apparatus for transmission and reception of FM in-band on-channel digital audio broadcasting |
US6523147B1 (en) | 1999-11-11 | 2003-02-18 | Ibiquity Digital Corporation | Method and apparatus for forward error correction coding for an AM in-band on-channel digital audio broadcasting system |
US20010055348A1 (en) * | 2000-03-31 | 2001-12-27 | Anderson Christopher L. | Sequential quadrant demodulation of digitally modulated radio signals |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5220753A (en) * | 1975-06-11 | 1977-02-16 | Motorola Inc | Quadrature phase shift keying demodulator |
US4344178A (en) * | 1980-09-26 | 1982-08-10 | Harris Corporation | Costas loop QPSK demodulator |
JPS57131151A (en) * | 1981-02-06 | 1982-08-13 | Nec Corp | Carrier wave reproducing circuit |
US4574244A (en) * | 1984-06-22 | 1986-03-04 | Rockwell International Corporation | QAM Demodulator automatic quadrature loop using n-m LSB's |
DE3664991D1 (en) * | 1986-03-15 | 1989-09-14 | Itt Ind Gmbh Deutsche | Control circuit for controlling two signals out of phase by about 90o |
AU591436B2 (en) * | 1986-11-19 | 1989-11-30 | Nec Corporation | Interference immune digital modulation receiver |
CA1278610C (en) * | 1987-09-21 | 1991-01-02 | Eisaku Sasaki | Stepped square-qam demodulator utilizing all signal points to generate control signals |
JPH01158854A (ja) * | 1987-12-15 | 1989-06-21 | Fujitsu Ltd | ディジタル無線通信システムの復調器 |
US4833416A (en) * | 1988-03-30 | 1989-05-23 | Motorola, Inc. | QPSK/BPSK demodulator |
US4871974A (en) * | 1988-12-23 | 1989-10-03 | International Business Machines, Corp. | Coherent phase shift keyed demodulator |
US4993047A (en) * | 1989-09-05 | 1991-02-12 | At&T Bell Laboratories | Volterra linearizer for digital transmission |
-
1990
- 1990-08-29 US US07/575,136 patent/US5134634A/en not_active Expired - Lifetime
- 1990-08-30 EP EP90116647A patent/EP0415406B1/de not_active Expired - Lifetime
- 1990-08-30 DE DE69024879T patent/DE69024879T2/de not_active Expired - Lifetime
- 1990-08-31 AU AU62082/90A patent/AU627065B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
AU6208290A (en) | 1991-03-07 |
EP0415406A2 (de) | 1991-03-06 |
DE69024879T2 (de) | 1996-05-30 |
AU627065B2 (en) | 1992-08-13 |
EP0415406A3 (en) | 1992-06-03 |
EP0415406B1 (de) | 1996-01-17 |
US5134634A (en) | 1992-07-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition |