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Channel Tracking Using Particle Filtering in Unresolvable Multipath Environments

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.

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Correspondence to Tanya Bertozzi.

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Bertozzi, T., Le Ruyet, D., Panazio, C. et al. Channel Tracking Using Particle Filtering in Unresolvable Multipath Environments. EURASIP J. Adv. Signal Process. 2004, 705208 (2004). https://doi.org/10.1155/S1110865704409019

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Keywords and phrases

  • sequential Monte Carlo
  • multipath channels
  • importance sampling
  • timing estimation