Soft decision method and receiver

H - Electricity – 04 – L

Patent

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Details

H04L 1/00 (2006.01) H04L 25/06 (2006.01) H04L 27/32 (2006.01) H04L 27/38 (2006.01) H04N 7/64 (2006.01)

Patent

CA 2219731

When the received symbol is located within one of regions G, H, I, L, M, N, Q, R, and S, 2 bits are decided to be most reliable to obtain their soft decision values = 0 or 7. As for the remaining 2 bits, a soft decision value = 0 to 7 is decided by soft decision in the I- or Q-axis direction. When the received symbol is located within one of regions A, E, U, and Y, all the 4 bits are decided to obtain their soft decision values = 0 or 7. When the received symbol is located with one of regions B, C, D, F, J, K, O, P, T, V, W, and X, 3 bits are decided to be most reliable to obtain their soft decision values = 0 or 7. As for the remaining 1 bit, a soft decision value = 0 to 7 is obtained by soft decision in the I- or Q-axis direction. A soft decision method that can implement soft decision in multilevel (amplitude and/or phase) modulation and can fully exhibit the correction performance of maximum likelihood coding can be provided.

Quand un symbole reçu se trouve dans l'une des régions G, H, I, L, M, N, Q, R et S, les 2 bits les plus fiables pour obtenir leurs valeurs de décision pondérée 0 et 7 sont sélectionnés. Pour les 2 bits résiduels, une valeur comprise entre 0 et 7 est sélectionnée par décision pondérée sur l'axe des I ou l'axe des Q. Quand le symbole reçu se trouve dans l'une des régions A, E, U et Y, les 4 bits sont sélectionnés pour obtenir leurs valeurs de décision pondérée 0 ou 7. Quand le symbole reçu se trouve dans l'une des régions B, C, D, F, J, K, O, P, T, V, W et X, les 3 bits les plus fiables pour obtenir leurs valeurs de décision pondérée 0 et 7 sont sélectionnés. Pour l'unique bit résiduel, une valeur comprise entre 0 et 7 est obtenue par décision pondérée sur l'axe des I ou l'axe des Q. L'invention permet d'obtenir une méthode de décision pondérée en modulation multiniveau (amplitude et/ou phase) qui a la performance de correction du codage à maximum de vraisemblance.

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