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Digital demodulator, maximum-value selector, and diversity receiver

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H03D-003/22
출원번호 US-0788960 (1997-01-24)
우선권정보 JP-0127136 (1996-05-22)
발명자 / 주소
  • Oura Hideto,JPX
  • Ishii Yoshiyuki,JPX
  • Iguchi Yuji,JPX
출원인 / 주소
  • Oki Electric Industry Co., Ltd., JPX
대리인 / 주소
    Rabin & Champagne P.C.
인용정보 피인용 횟수 : 51  인용 특허 : 15

초록

A digital demodulator compensates for frequency offset between modulated and unmodulated carrier signals by detecting the frequency offset during a preamble with a known modulation pattern. Samples obtained during the preamble are stored in a memory during clock recovery, and read from the memory af

대표청구항

[ What is claimed is:] [1.] A digital demodulator that receives a modulated signal modulated by phase-shift keying, said digital demodulator includinga carrier generator generating an unmodulated signal nominally equal in frequency to said modulated signal but not synchronized in phase to said modul

이 특허에 인용된 특허 (15)

  1. Ibenthal Achim (Elmshorn DEX), Circuit arrangement for synchronizing a data stream.
  2. Oura Hideto (c/o Oki Electric Industry Co. ; Ltd. 7-12 ; Toranomon 1-chome Minato-ku ; Tokyo JPX) Iguchi Yuji (c/o Oki Electric Industry Co. ; Ltd. 7-12 ; Toranomon 1-chome Minato-ku ; Tokyo JPX), Coherent PSK detector not requiring carrier recovery.
  3. Oguro Masaki (Tokyo JPX), Copyright protection for digital signal recording and/or reproduction and recording medium thereof.
  4. Schneider Richard C. (Tucson AZ), Digital phase error estimator.
  5. Liao Henry H. (Rocsmoor CA), Electronic rescreen technique for halftone pictures.
  6. Kim In-Kyung (N. Potomac MD), Fast acquisition of GMSK-modulated signal for CDPD applications.
  7. Hopkins ; Jr. ; Robert Sherman ; Banks ; Arthur James ; Dischert ; Robe rt Adams, Memory read/write organization for a television signal processor.
  8. Carsello Stephen Rocco, Method and apparatus for classifying a multi-level signal.
  9. van Heerden Pieter J. (18217 145th Court N. E. Woodinville WA 98072) Marks ; II Robert J. (1131 - 199th St. ; S. W. Lynwood WA 98036) Oh ; Seho (4747 30th Ave. ; N. E. #K173 Seattle WA 98105), Method and apparatus for identifying that one of a set of past or historical events best correlated with a current or re.
  10. Price Roderick A. (Palo Alto CA) Thielges Bart C. (San Jose CA), Method for substantially eliminating hold time violations in implementing high speed logic circuits or the like.
  11. Markus David R. (Monroeville PA), Minimum time delay filtering method for automatic voltage regulators.
  12. Martinez Aldo A. (Miami FL), Modem clock with automatic gain control.
  13. Butler Donald S. (Scottsdale AZ), Random access memory with circuitry for concurrently and sequentially writing-in and reading-out data at different rates.
  14. Strolle Christopher H. (Glenside PA) Jaffe Steven T. (Freehold NJ) Lyons Paul W. (New Egypt NJ), Single oscillator compressed digital information receiver.
  15. Wagner Steven D. (Belmont CA), Television digital signal processing apparatus employing time-base correction.

이 특허를 인용한 특허 (51)

  1. Takashi Asahara JP; Toshiharu Kojima JP, Automatic frequency controller and demodulator unit.
  2. Mennenga,Menno; Eckhardt,Uwe; Schmidt,Michael, Average tracking mechanism in data communications receivers.
  3. Bax, Randall L.; Elayed, Karim; Medina, Paul, Bus bar interconnection techniques.
  4. Spalink, Gerd, Carrier recovery means.
  5. Rumreich, Mark Francis, Chrominance processing arrangement having immunity to colorstripe encoding.
  6. Qiu, Wenxun; Schmidl, Timothy Mark, Circuits and methods for frequency offset estimation in FSK communications.
  7. Qiu, Wenxun; Schmidl, Timothy Mark, Circuits and methods for frequency offset estimation in FSK communications.
  8. Sutioso, Henri; Wu, Lei, Clock offset compensator.
  9. Chen, Young-Kai; Koc, Ut-Va; Leven, Andreas Bertold, Coherent phase-shift-keying.
  10. Jovanovic, Milun; Dussmann, Alfons; Kummetz, Thomas, Communication system with channel compensating equalizer.
  11. Jovanovic, Milun; Dussmann, Alfons; Kummetz, Thomas, Communication system with channel compensating equalizer.
  12. Yoshikawa, Hiroshi, Data update processing method and vehicle operation control device.
  13. Marume,Kei, Demodulator with phase-adjusting function.
  14. Legrand,Delphine; Brajal,Americo; Chouly,Antoine, Detection and correction of phase jumps in a phase sequence.
  15. Toshinori Iinuma,JPX, Digital demodulator.
  16. Toshinori,Iinuma, Digital demodulator.
  17. Fattal, Souren G.; Peterson, Mitchell E., Distinguishing between different transient conditions for an electric power generation system.
  18. Strolle, Christopher H; Shah, Anand M; Endres, Thomas J; Hulyalkar, Samir N; Schaffer, Troy A, Diversity receiver with joint baud clock recovery.
  19. Bax, Randall L.; Peterson, Mitchell E.; Naden, Mark, Electric power generation system with current-controlled power boost.
  20. Peterson, Mitchell E.; Kunin, Sergey, Electric power generation system with multiple alternators driven by a common prime mover.
  21. Fattal, Souren G., Electric power generation system with multiple inverters.
  22. Cueff, Valerie; Terre, Michel, Estimating frequency offset to demodulate a packet of phase-modulated symbols.
  23. Dolder Nicole,GBX, Extraction of primary and co-channel signals.
  24. Yan, Aiguo; Shabra, Ayman, Filters for communication systems.
  25. Ogasahara, Daisaku, Frequency deviation compensation scheme, frequency deviation compensation method, and storage medium.
  26. Berscheid, Brian; Salt, Eric; Nguyen, Ha, Frequency offset estimator for upstream cable signals.
  27. Fattal, Souren G., Large transient detection for electric power generation.
  28. Cook,Thomas; Deboes,Frederic, Low pass filter systems and methods.
  29. Bax, Randall; Peterson, Mitchell E., Management of an electric power generation and storage system.
  30. Peterson, Mitchell E.; Bax, Randall, Management of an electric power generation and storage system.
  31. Shapira, Yaniv; Billic, Hrvoje, Method and apparatus for controlling data transfer in a serial-ATA system.
  32. Chang, Po-Chien, Method and apparatus for providing an interface between a host device and a plurality of storage devices.
  33. Blanc,Alain; Jeanniot,Patrick, Method and systems for analyzing the quality of high-speed signals.
  34. Blanc,Alain; Jeanniot,Patrick, Method and systems for analyzing the quality of high-speed signals.
  35. Sakamoto, Mai, Method for determining noise floor level and radar using the same.
  36. Yan,Aiguo, Methods and apparatus for communication in a wireless system.
  37. Lau, Kam Y.; Vassiliou, Iason; Venkatraman, Mahesh, Multichannel distributed wireless repeater network.
  38. Suzuki, Yuuzou, Multilevel QAM demodulator, multilevel QAM demodulation method, and wireless communication system.
  39. Koc, Ut-Va, Optical quadrature-amplitude modulation receiver.
  40. Feldman, Arnold R.; Mossawir, Benjamin Joseph, Phase shifter chip radio frequency self-test.
  41. Brunner, Eberhard, Quadrature demodulation with phase shift.
  42. Chen, Dung-Yun; Hsu, Chin-Fa; Fu, Hung-Shiun; Huang, Chung-Shine, Radio frequency control for communication systems.
  43. Koc, Ut-Va, Recursive phase estimation for a phase-shift-keying receiver.
  44. Ayana, Elias; Peterson, Mitchell E.; Marlenee, Alyssa, Shore power transfer switch.
  45. Iida, Yasuhiro; Oguchi, Kazuhiro, Signal processing device, method of processing signal, and recording medium.
  46. Narasimhan, Ravi, Systems and methods for compensating a channel estimate for phase and sampling phase jitter.
  47. Sutioso, Henri; Wu, Lei, Systems and methods for compensating a phase of a local clock of a storage device.
  48. Yang, Xueshi; Erden, Mehmet F.; Kurtas, Erozan M., Timing recovery in a parallel channel communication system.
  49. Murray, Jerry; Carney, Allen B.; Bax, Randall L.; Ayana, Elias; Pautzke, Roger; McCarthy, John, Transfer switch assembly.
  50. Murray, Jerry; Carney, Allen B.; Bax, Randall L.; Ayana, Elias; Pautzke, Roger; McCarthy, John, Transfer switch assembly and method.
  51. Heinz, John E.; Haupt, Brian G., Zero crossing detection for an electric power generation system.
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