One-bit correlator rake receiver

Details One-bit correlator rake receiver One-bit correlator rake receiver

H - Electricity

04

B

H04B 1/707 (2006.01)

Patent

CA 2335020

The present invention relates generally to receivers in DS-CDMA receivers, and more particularly to the need for providing a pulse-matched filter to eliminate interchip interference. A CDMA RAKE receiver is used. Instead of applying a pulse- matched filter to the input signal as in state of the art systems, a one-bit pulse- matched filter is applied to the spreading sequence, preferably a pseudonoise (PN) sequence, which interpolates up to the required oversampling ratio. Since the filter has a one- bit input, the multipliers can be replaced by adders which consume less power. Also, the number of adders does not increase with the oversampling ratio as do the number of multipliers in the prior art.

L'invention concerne des récepteurs DS-CDMA, et plus particulièrement le besoin de fournir un filtre accordé sur l'impulsion permettant d'éliminer les interférences entre puces. On utilise un récepteur RAKE CDMA. Au lieu d'appliquer un filtre accordé sur l'impulsion au signal d'entrée comme c'est le cas dans les systèmes selon l'état de la technique, on applique un filtre accordé sur l'impulsion à un bit à la séquence de dispersion, de préférence, à une séquence de bruit pseudoalétoire (PN) interpolée jusqu'à la fréquence de suréchantillonnage requise. Le filtre ayant une entrée à un bit, on peut remplacer les multiplicateurs par des sommateurs qui consomment moins de courant. Contrairement au nombre de multiplicateurs selon l'état de la technique, le nombre de sommateurs n'augmente pas avec la fréquence de suréchantillonnage.

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