Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Patent
1994-10-13
1998-06-16
Chin, Stephen
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
375344, 375345, H04L 700
Patent
active
057683239
ABSTRACT:
A method and apparatus for synchronizing symbol timing for a QPSK demodulator. A matched filter pair outputs respective "early-punctual-late" signals. The early and late signals are input to a symbol synchronizing estimator that produces an interpolation control signal used by the filters to synchronize the symbol timing to the sample timing. The punctual signal is output as an information bearing signal representing the received inphase and quadrature signals. The matched filters are interpolating matched filters. The symbol synchronizing estimator normalizes the early and late signals in a manner that allow the demodulator to "flywheel" over signals having a low signal to noise ratio below a predetermined threshold.
REFERENCES:
patent: 4143322 (1979-03-01), Shimamura
patent: 4318049 (1982-03-01), Mogenson
patent: 4466108 (1984-08-01), Rhodes
patent: 4787096 (1988-11-01), Wong
patent: 4879728 (1989-11-01), Tarallo
patent: 5390207 (1995-02-01), Fenton et al.
patent: 5517535 (1996-05-01), Kroeger et al.
patent: 5566214 (1996-10-01), Kroeger et al.
patent: 5579345 (1996-11-01), Kroeger et al.
Thompson, et al., "High-Speed Integrated Receiver Demod and Tracking ASIC,". Military Communications In A Changing World Milcom 91, IEEE Conference Record (CAT No. 91CH2981-9), McLean, VA, USA, vol. 1 pp. 42-46.
Connelly, "Design of the Westinghouse Series 1000 Mobile Phone," IEEE, pp. 347-350, May 18, 1993.
Connelly, "The Westinghouse Series 1000 Mobile Phone: Technology and Applications," IEEE, pp. 375-379, May 18, 1993.
Baird Jeffrey S.
Bronder Joseph B.
Kroeger Brian W.
Oblak Tod A.
Chin Stephen
Webster Bryan
Westinghouse Electric Corporation
LandOfFree
Symbol synchronizer using modified early/punctual/late gate tech does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Symbol synchronizer using modified early/punctual/late gate tech, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Symbol synchronizer using modified early/punctual/late gate tech will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1735252