Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-10-17
2006-10-17
Tse, Young T. (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C714S766000, C714S795000, C714S802000
Reexamination Certificate
active
07123668
ABSTRACT:
A simplified Viterbi detector for maximum likelihood detection of nine-bit QPSK symbols, employing a difference metric and two comparators, instead of using two state metrics and four comparators. The detector is used to process the outputs of synchronously sampled matched filters. A multiplexer is employed to select the difference metric from amongst the input sample, the fed back value of the difference metric itself, or the inverses of either, depending on decision signals output from the comparators, which in turn compare the difference metric with the input sample and it's inverse. The even path history then represents the most likely value of the detected symbol.
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Agere Systems Inc.
Tse Young T.
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