Device and method for data encoding and frequency diversity...

Details Device and method for data encoding and frequency diversity... Device and method for data encoding and frequency diversity...

H - Electricity

03

M

H03M 7/00 (2006.01) H04L 1/00 (2006.01) H04L 1/04 (2006.01)

Patent

CA 2302175

A code set generating method in a mobile communications system having Nf frequency channels and Np phase channels. In the method, a code length Nc is obtained by NfxNp, a minimum distance Nd between codewords in a code set and frequency diversity Nfd are determined, code sets are detected according to Nc, Nd, and Nfd, a code set is selected, which shows such a Hamming distance distribution among code words that minimizes demodulation errors from the detected code sets, and the code set is stored in a mapping table of a demodulator.

Cette invention concerne un procédé de génération d'ensembles de codes pour un systèmes de communications mobile qui possède un nombre Nf de canaux de fréquence et un nombre Np de canaux de phase. D'après ce procédé, une longueur de code Nc est obtenue par l'opération Nf x Np, après quoi on détermine la distance minimale Nd entre les mots de code d'un ensemble de codes, ainsi que la diversité de fréquence Nfd. Des ensembles de codes sont détectés en fonction de Nc, Nd et Ndf, après quoi on choisit un ensemble de codes présentant une répartition de distance Hamming parmi des mots de codes qui permet de minimiser les erreurs de démodulation depuis les ensembles de codes détectés. L'ensemble de code est finalement stocké dans la table de mappage d'un démodulateur.

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