Viterbi equalizer for radio receiver
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United States of America Patent
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Nov 16, 1993
Grant Date -
N/A
app pub date -
Sep 30, 1991
filing date -
Sep 30, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A Viterbi equalizer for decoding a .pi./4 DQPSK modulated signal. Because symbol values of adjacent symbols of a .pi./4 DQPSK signal are offset in phase relative to one another, allowable values of succeeding states of a .pi./4 DQPSK signal are four in number. The signal paths of the Viterbi equalizer are thereby limited in number to four allowable next-states, and the Viterbi equalizer is operative to select certain ones of the paths connecting the states at the adjacent time intervals as survivor paths to form maximum likelihood paths thereby.
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