Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-04-19
2005-04-19
Vo, Don N. (Department: 2631)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
06882690
ABSTRACT:
A soft trellis slicer is provided in a high definition television (HDTV) receiver. The soft trellis slicer calculates a decision value and a confidence value corresponding to a phase angle error of a signal processed by the receiver. The receiver includes an equalizer, a phase tracking loop and a trellis decoder. The equalizer provides an equalized signal to the phase tracking loop; and the phase tracking loop calculates a phase angle error for the equalized signal. The trellis decoder calculates a decision value and a confidence value. The trellis decoder provides the decision value and the confidence value to the phase tracking loop, which calculates the reliability of the phase angle error based upon the phase angle error and the decision value and the confidence value provided by the trellis decoder. The trellis decoder calculates the decision value based upon a best path metric and calculates the confidence value based upon the best path metric and a second best path metric.
REFERENCES:
VSB Modem Subsystem Design fro Grand Alliance Digital TV Receivers, Wayne Bretl et al., IEEE Transactions on Consumer Electronics, Aug. 1995, V. 41, No. 3, pp. 773-786.
A Hardware Efficient Phase/gain Tracking Loop for the Grand Alliance VSB HDTV Receiver, Wonho Lee et al., IEEE Transactions on Consumer Electronics, Aug. 1996, V. 42, No. 3, pp. 632-639.
Design and Implementation of a Grand Alliance HDTV Receiver Prototype, Kwonhue Choi et al., ., IEEE Transactions on Consumer Electronics, Aug. 1997, V. 43, No. 3, pp. 755-759.
VSB Demodulator for ASIC Design and Development for HDTV System, Myeong-Hwan Lee et al., 10th IEEE International ASIC Conference, 1997, pp. 233-237.
The Viterbi Algorithm, M.S. Ryan and G.R. Nudd, Department of Computer Science, University of Warwick, Coventry, England, Feb. 12, 1993, pp. 1-17.
What Exactly is 8-VSB Anyway?, David Sparano, <http://www.broadcast.harris.com/customer-service/8-vsb.html>, downloaded Oct. 14, 1999, pp. 1-12.
Berggren Magnus H.
Florentin Itzhak
Sinha Pranesh
Conexant Systems Inc.
Godwin Gruber LLP
Rourk Christopher J.
Vo Don N.
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