ZA879132B - Process and circuit for acquisition of carrier synchronism in coherent demodulators - Google Patents
Process and circuit for acquisition of carrier synchronism in coherent demodulatorsInfo
- Publication number
- ZA879132B ZA879132B ZA879132A ZA879132A ZA879132B ZA 879132 B ZA879132 B ZA 879132B ZA 879132 A ZA879132 A ZA 879132A ZA 879132 A ZA879132 A ZA 879132A ZA 879132 B ZA879132 B ZA 879132B
- Authority
- ZA
- South Africa
- Prior art keywords
- acquisition
- circuit
- coherent demodulators
- synchronism
- carrier
- Prior art date
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
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0046—Open loops
- H04L2027/0051—Harmonic tracking
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Circuits Of Receivers In General (AREA)
- Radar Systems Or Details Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT22584/86A IT1199705B (it) | 1986-12-05 | 1986-12-05 | Procedimento e circuito per l'acquisizione del sincronismo di portante in demodulatori coerenti |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA879132B true ZA879132B (en) | 1988-06-04 |
Family
ID=11198114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA879132A ZA879132B (en) | 1986-12-05 | 1987-12-04 | Process and circuit for acquisition of carrier synchronism in coherent demodulators |
Country Status (8)
Country | Link |
---|---|
US (1) | US4795986A (xx) |
EP (1) | EP0270160B1 (xx) |
JP (1) | JP2557426B2 (xx) |
DE (1) | DE3788858T2 (xx) |
ES (1) | ES2048154T3 (xx) |
IT (1) | IT1199705B (xx) |
NO (1) | NO170249C (xx) |
ZA (1) | ZA879132B (xx) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2552927B2 (ja) * | 1990-01-26 | 1996-11-13 | 三菱電機株式会社 | π/4シフトQPSK信号の復調装置 |
US5067139A (en) * | 1990-12-17 | 1991-11-19 | Motorola, Inc. | Coherent detector for QPSK modulation in a TDMA system |
DE4140132C2 (de) * | 1991-12-05 | 1994-07-21 | Blaupunkt Werke Gmbh | Digitaler Oszillator |
US5568521A (en) * | 1993-09-16 | 1996-10-22 | Unisys Corporation | Phase lock indicator circuit for a high frequency recovery loop |
US5418489A (en) * | 1993-10-08 | 1995-05-23 | Motorola, Inc. | Method of recovering a frequency modulated signal |
IT1271527B (it) * | 1993-10-14 | 1997-05-30 | Sits Soc It Telecom Siemens | Metodo di recupero del sincronismo di simbolo in ricevitori di segnali modulati digitalmente e circuito da esso derivato |
GB2286950B (en) * | 1994-02-22 | 1998-06-17 | Roke Manor Research | A direct conversion receiver |
JPH07250115A (ja) * | 1994-03-09 | 1995-09-26 | Toshiba Corp | デジタルデータ受信装置 |
WO1996007234A1 (en) * | 1994-08-26 | 1996-03-07 | Motorola Inc. | Communication device with efficient zero-crossing generator |
US5930687A (en) * | 1996-09-30 | 1999-07-27 | Usa Digital Radio Partners, L.P. | Apparatus and method for generating an AM-compatible digital broadcast waveform |
KR100368013B1 (ko) * | 1996-11-06 | 2003-02-26 | 로크 마노 리서치 리미티드 | 직접변환수신기 |
US5878089A (en) * | 1997-02-21 | 1999-03-02 | Usa Digital Radio Partners, L.P. | Coherent signal detector for AM-compatible digital audio broadcast waveform recovery |
US6128334A (en) * | 1997-02-21 | 2000-10-03 | Usa Digital Radio, Inc. | Receiver addressable AM compatible digital broadcast system |
DE19735798C1 (de) * | 1997-08-18 | 1998-07-16 | Siemens Ag | Sendeempfänger |
JP2000278344A (ja) * | 1999-03-25 | 2000-10-06 | Sanyo Electric Co Ltd | 疑似ロック検出システム |
US6707863B1 (en) * | 1999-05-04 | 2004-03-16 | Northrop Grumman Corporation | Baseband signal carrier recovery of a suppressed carrier modulation signal |
US6606357B1 (en) | 1999-09-10 | 2003-08-12 | Harris Corporation | Carrier injecting waveform-based modulation scheme for reducing satellite transponder power requirements and earth terminal antenna size |
JP3841077B2 (ja) * | 2003-10-17 | 2006-11-01 | ソニー株式会社 | デジタル変調回路およびデジタル変調方法、デジタル復調回路およびデジタル復調方法、復調用キャリアの生成回路および生成方法、並びに復調用ビットクロックの生成回路および生成方法 |
KR100556399B1 (ko) * | 2003-12-01 | 2006-03-03 | 엘지전자 주식회사 | Oob qpsk 수신기의 반송파 복구 장치 |
DE10361037A1 (de) * | 2003-12-23 | 2005-07-28 | Infineon Technologies Ag | Verfahren und Vorrichtung zur Demodulation eines phasenmodulierten Signals |
RU2286025C1 (ru) * | 2005-06-15 | 2006-10-20 | Игорь Борисович Дунаев | Способ передачи и приема сигналов квадратурной амплитудной модуляции, система для его осуществления, машиночитаемый носитель и применение способа для синхронизации приема сигналов квадратурной амплитудной модуляции |
US8259859B2 (en) * | 2009-09-21 | 2012-09-04 | Techwell Llc | Method and system for carrier recovery for QAM |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5925500B2 (ja) * | 1978-03-03 | 1984-06-18 | 日本電気株式会社 | 搬送波再生回路 |
JPS55132132A (en) * | 1979-03-30 | 1980-10-14 | Nec Corp | Phase synchronizing circuit |
-
1986
- 1986-12-05 IT IT22584/86A patent/IT1199705B/it active
-
1987
- 1987-11-12 DE DE3788858T patent/DE3788858T2/de not_active Expired - Fee Related
- 1987-11-12 EP EP87202202A patent/EP0270160B1/en not_active Expired - Lifetime
- 1987-11-12 ES ES87202202T patent/ES2048154T3/es not_active Expired - Lifetime
- 1987-11-16 US US07/121,562 patent/US4795986A/en not_active Expired - Fee Related
- 1987-12-01 JP JP62301627A patent/JP2557426B2/ja not_active Expired - Lifetime
- 1987-12-04 ZA ZA879132A patent/ZA879132B/xx unknown
- 1987-12-04 NO NO875070A patent/NO170249C/no unknown
Also Published As
Publication number | Publication date |
---|---|
IT1199705B (it) | 1988-12-30 |
NO170249B (no) | 1992-06-15 |
JP2557426B2 (ja) | 1996-11-27 |
DE3788858T2 (de) | 1994-06-01 |
NO170249C (no) | 1992-09-23 |
ES2048154T3 (es) | 1994-03-16 |
NO875070L (no) | 1988-06-06 |
EP0270160A3 (en) | 1990-03-21 |
EP0270160A2 (en) | 1988-06-08 |
NO875070D0 (no) | 1987-12-04 |
JPS63151246A (ja) | 1988-06-23 |
IT8622584A0 (it) | 1986-12-05 |
DE3788858D1 (de) | 1994-03-03 |
US4795986A (en) | 1989-01-03 |
EP0270160B1 (en) | 1994-01-19 |
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