Channel tracking using particle filtering in unresolvable multipath environments

Authors:
Tanya Bertozzi;Didier Le Ruyet;Cristiano Panazio;Han Vu Thien
Affiliations:
Diginext, Impasse de la Draille, Aix-en-Provence Cedex, France and Conservatoire National des Arts et Métiers (CNAM), rue Saint-Martin, Paris Cedex, France;Conservatoire National des Arts et Métiers (CNAM), Paris Cedex, France;Conservatoire National des Arts et Métiers (CNAM), Paris Cedex, France;Conservatoire National des Arts et Métiers (CNAM), Paris Cedex, France
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2004

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Abstract

We propose a new timing error detector for timing tracking loops inside the Rake receiver in spread spectrum systems. Based on a particle filter, this timing error detector jointly tracks the delays of each path of the frequency-selective channels. Instead of using a conventional channel estimator, we have introduced a joint time delay and channel estimator with almost no additional computational complexity. The proposed scheme avoids the drawback of the classical early-late gate detector which is not able to separate closely spaced paths. Simulation results show that the proposed detectors outperform the conventional early-late gate detector in indoor scenarios.