Apparatus and method for determining combiner weights and...

H - Electricity – 04 – L

Patent

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H04L 1/00 (2006.01) H04L 1/02 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2473233

Methods and apparatus are presented herein for determining log likelihood ratios (LLRs) for code symbols. Pilot and code symbols are transmitted over diversity channels, which can be modeled as a slowly time varying system. A formulation for a multipath gain vector is derived herein based on the slowly time varying model. The multipath gain vector is then solved using iterative procedures (550). Using the solved multipath gain vector, the LLRs for code symbols are computed.

L'invention concerne des procédés et un appareil qui permettent de déterminer des logarithmes de rapports de taux de vraisemblance pour des symboles de codes. Les symboles pilotes et de codes sont transmis sur des voies en diversité qui peuvent être modelées comme des systèmes variant lentement dans le temps. Une formulation pour un vecteur de gain à trajets multiples est dérivée en se fondant sur le modèle variant lentement dans le temps. Ce vecteur est ensuite résolu à l'aide de procédures itératives (550). Les logarithmes de rapports de taux de vraisemblance sont calculés pour les symboles de code à l'aide du vecteur de gain à trajets multiples.

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