Multiplex communications – Fault recovery
Reexamination Certificate
2011-02-22
2011-02-22
Ferris, Derrick W (Department: 2463)
Multiplex communications
Fault recovery
C375S376000
Reexamination Certificate
active
07894333
ABSTRACT:
A receiver includes a digital phase locked loop (PLL) for performing carrier recovery. The digital PLL further includes a phase error estimator driven by hard decisions and an integrator, which accumulates a phase error signal provided by the phase error estimator. To reduce the acquisition time, the digital PLL is run in an open-loop mode during which an estimate of the carrier frequency offset is determined as a function of the phase error signal. After the estimate of the carrier frequency offset is determined, the integrator is pre-loaded with the determined estimate and the digital PLL is run in a closed-loop mode.
REFERENCES:
patent: 4297650 (1981-10-01), Shinmyo
patent: 4987386 (1991-01-01), Poklemba et al.
patent: 5471508 (1995-11-01), Koslov
patent: 5490176 (1996-02-01), Peltier
patent: 5841323 (1998-11-01), Fujimoto
patent: 6151368 (2000-11-01), Cochran
patent: 6298100 (2001-10-01), Bouillet
patent: 6947497 (2005-09-01), Ahn
patent: 2002/0067778 (2002-06-01), Ahn
patent: 2002/0122511 (2002-09-01), Kwentus et al.
patent: 2003/0137765 (2003-07-01), Yamazaki et al.
patent: 10-107623 (1998-04-01), None
patent: 2001-168931 (2001-06-01), None
patent: 2002-185314 (2002-06-01), None
Matzner et al., “A Digital Transmission System Using Quaternary Partial Response CPM Principle Structure and Measurement Results”, Proceedings of the International Conference on Communicaions (ICC). Geneva, May 23-26, 1993, New York, IEEE, US, vol. vol. 3, May 23, 1993, pp. 732-736.
Search Report dated Dec. 20, 2004.
Matzner R et al.: “A Digital Tranmission System Using Quaternary Partial Response CPM: Principle Structure and Measurement Results” Proceedings of the International Conference on Communications (ICC), Geneva, May 23-26, 1993, New York, IEEE, US, vol. 3, May 23, 1993, pp. 732-736.
Ferris Derrick W
Ghowrwal Omar
Opalach Joseph J.
Shedd Robert D.
Thomson Licensing
LandOfFree
Method and apparatus for use in carrier recovery in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for use in carrier recovery in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for use in carrier recovery in a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2629281