Method and system for computing log-likelihood ratios for...

H - Electricity – 04 – L

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H04L 27/34 (2006.01) H03M 13/45 (2006.01)

Patent

CA 2586091

According to an embodiment of the invention, a method and system is disclosed for determining log-likelihood ratios for a coded set of individual bits (40) of a quadrature amplitude modulation (QAM) codeword. In the method at most two constant values (33,35) may be determined to perform a set of predetermined functions, the output of each of function is based on the constant values and at least one received component corresponding to the code word, to determine log-likelihood ratios (37) for each individual bit of the set of individual bits of the codeword. The QAM codeword may correspond to at least a portion of a signal of a wireless device, such as a mobile third-generation device operating according to a Wideband Code-Division Multiple Access (WCDMA) standard.

Selon un mode de réalisation, l'invention concerne un procédé et un système permettant de déterminer des taux de probabilité pour un jeu codé de bits individuels (40) d'un mot de code à modulation d'amplitude en quadrature (QAM). Selon le procédé, tout au plus deux valeurs constantes (33, 35) peuvent être déterminées pour effectuer un ensemble de fonctions prédéterminées. Le résultat de chaque fonction repose sur les valeurs constantes et sur au moins une composante reçue correspondant au mot de code, afin de déterminer les taux de probabilité (37) de chaque bit individuel du jeu de bits individuels du mot de code. Le mot de code QAM peut correspondre à au moins une partie d'un signal d'un dispositif sans fil, comme un système mobile de troisième génération fonctionnant selon une norme d'accès multiple par code à répartition à bande large (WCDMA).

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