Method and apparatus for decoding an encoded signal

H - Electricity – 04 – L

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H04L 1/00 (2006.01) H04B 1/69 (2006.01) H04L 25/03 (2006.01) H04L 27/10 (2006.01)

Patent

CA 2209083

A decoder (215) implemented in a receiver of a wireless communication system employs an improved method and apparatus for decoding an encoded signal. The receiver sums the energy values (156A, 156B,...156N) from a plurality of fingers within to produce an aggregate energy value (166). From the aggregate energy value (166), a set of log-likelihood values (207) are generated with a non-linear function generator (205) before being deinterleaved by a deinterleaver (210). The deinterleaved values (213) are input to the decoder (215) which estimates the original signal (178) by incorporating path histories of bits in the estimation of subsequent, related bits. Use of the path histories of bits improves the estimates of the original signal (178), which translates into an increase in the sensitivity of the receiver.

L'invention est un décodeur (215) incorporé à un récepteur de système de communication sans fil; ce décodeur utilise une méthode et un dispositif améliorés pour décoder les signaux. Le récepteur somme les énergies (156A, 156B, ...156N) obtenues d'une pluralité de dispositifs de repérage incorporés pour obtenir l'énergie globale (166). A partir de cette énergie globale (166), un générateur de fonctions non linéaires (205) produit un ensemble de logarithmes du rapport de vraisemblance (207) que des désentrelaceurs (210) désentrelacent ensuite. Les valeurs désentrelacées (213) sont transmises au décodeur (215) qui produit une approximation du signal originel (178) en incorporant les historiques de trajet des bits dans la détermination des bits connexes qui suivent. L'utilisateur d'historiques de trajet de bits améliore l'approximation du signal originel (178), ce qui se traduit par un accroissement de la sensibilité du récepteur.

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