Data recovery technique for asynchronous cdma systems

Details Data recovery technique for asynchronous cdma systems Data recovery technique for asynchronous cdma systems

H - Electricity

04

J

H04J 13/00 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2102081

To recover the bits from various users in an asynchronous CDMA communications system, samples of the received signal are processed using blocksof code coefficients. Each code coefficient block includes the sequence of code coefficients for each user which formed the received signal samples. Each sequence has the same number of code coefficients and this number is equal to the product of a predetermined number of bit intervals and the number of code coefficients per bit interval. Processing of the received signal samples using this block formation completely eliminates interference including the so-called leading and lagging edge effects and can be implemented with blocks that include the code coefficients in one or more bit intervals.

Pour récupérer les bits transmis par divers utilisateurs dans un système de communication AMRC asynchrone, des échantillons du signal reçu sont traités au moyen de blocs de coefficients de codage. Chaque coefficient de codage comprend pour chaque utilisateur la séquence de coefficients de codage qui constitue les échantillons de signal reçu. Chaque séquence comporte le même nombre de coefficients et ce nombre est égal au produit d'un nombre prédéterminé d'intervalles de bits et du nombre de coefficients de codage par intervalle de bits. Le traitement des échantillons de signal reçu au moyen de cette formation de blocs élimine complètement le brouillage, y compris les effets dits de front avant et de flanc arrière et peut être appliqué avec des blocs comprenant les coefficients de codage d'un ou de plusieurs intervalles de bits.

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