Rake receiver and finger management method for spread...

H - Electricity – 04 – B

Patent

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Details

H04B 1/16 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04B 7/005 (2006.01)

Patent

CA 2244602

A RAKE receiver (112) includes a plurality of fingers (122,124,126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.

Récepteur RAKE (112) comprenant plusieurs doigts (122, 124, 126, 128). Chacun de ces doigts comprend un démodulateur (402) servant à démoduler un rayon d'un signal à trajets multiples ainsi qu'un circuit de poursuite dans le temps (404), afin de vérifier la position dans le temps du doigt conformément à la position dans le temps du rayon. Une condition d'étalement du temps de propagation faible est détectée, et la position de deux doigts adjacents est vérifiée afin d'éviter la convergence de deux doigts ou plus dans une position commune dans le temps. En maintenant une séparation au niveau de la synchronisation des doigts, le récepteur RAKE peut exploiter divers trajets, même dans un contexte de condition d'étalement du temps de propagation faible, afin d'améliorer la performance du récepteur.

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