Viterbi equalizer for radio receiver

Details Viterbi equalizer for radio receiver Viterbi equalizer for radio receiver

1991-09-30

1993-11-16

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 56, 375 85, 375 94, 371 43, H04L 512

Patent

active

052630528

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.

REFERENCES:
patent: Re33056 (1989-09-01), Forney, Jr. et al.
patent: 4748626 (1988-05-01), Wong
patent: 4761784 (1988-08-01), Srinivasagopalan et al.
patent: 4763328 (1988-08-01), Shimoda et al.
patent: 4891806 (1990-01-01), Farias et al.
patent: 5023889 (1991-06-01), Divsalar et al.

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