System and method for calculating a state transition metric...

H - Electricity – 03 – D

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H03D 3/00 (2006.01) H04L 25/03 (2006.01) H04L 27/22 (2006.01)

Patent

CA 2097693

A system and method for calculating survivor metrics in a Viterbi equalizer (424) of a receiver (56), such as a receiver operative to receive a PSK-modulated signal, for example, a .pi./4, differential, phase- shift-keying, modulated signal. The state transition metric, defined as a function of two successive states, is converted into a function defined by pairwise differences between allowable symbols of the PSK-modulated signal. When operative to receive .pi./4 DQPSK-modulated signal, the number of calculations required to calculate state transition metrics is reduced significantly.

On décrit un système et une technique pour calculer, dans un égaliseur Viterbi (424), un métrique survivant d'un récepteur (56), tel qu'un récepteur conçu pour recevoir un signal modulé par MDP, par exemple un signal modulé, par déplacement de phase, différentiel, pi/4. Le métrique de transition d'état, défini en tant que fonction de deux états successifs, est converti en une fonction définie par des différences, se rapportant aux paires, entre des symboles admissibles du signal modulé par MDP. Lorsqu'il est prêt à recevoir le signal modulé par une technique de modulation de phase différentielle pi, le nombre de calculs requis pour calculer le métrique de transition d'état est réduit de manière significative.

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