Viterbi equalizer for radio receiver

Details Viterbi equalizer for radio receiver Viterbi equalizer for radio receiver

H - Electricity

04

L

H04L 27/01 (2006.01) H04B 7/005 (2006.01) H04L 25/03 (2006.01) H04L 27/22 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2097059

A Viterbi equalizer (366) 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 (600) and the Viterbi equalizer (366) 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.

Égaliseur Viterbi (366) permettant le décodage d'un signal modulé DQPSK .pi./4. Comme les valeurs de symboles adjacents d'un signal DQPSK .pi./4 sont déphasées les unes par rapport aux autres, les valeurs des états successifs d'un signal DQPSK .pi./4 sont au nombre de quatre. Les trajets de signal de l'égaliseur Viterbi sont ainsi numériquement limités à quatre états consécutifs admissibles (600) et l'égaliseur Viterbi (366) permet de sélectionner à des intervalles voisins certains des trajets reliant les états en tant que trajets survivants afin de former ainsi des trajets à vraisemblance maximale.

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