Open Access

Channel Characterization and Robust Tracking for Diversity Reception over Time-Variant Off-Body Wireless Communication Channels

  • Patrick Van Torre1, 3Email author,
  • Luigi Vallozzi1,
  • Hendrik Rogier1,
  • Marc Moeneclaey2 and
  • Jo Verhaevert3
EURASIP Journal on Advances in Signal Processing20102010:978085

https://doi.org/10.1155/2010/978085

Received: 29 January 2010

Accepted: 5 July 2010

Published: 20 July 2010

Abstract

In the 2.45 GHz band, indoor wireless off-body data communication by a moving person can be problematic due to time-variant signal fading and the consequent variation in channel parameters. Off-body communication specifically suffers from the combined effects of fading, shadowing, and path loss due to time-variant multipath propagation in combination with shadowing by the human body. Measurements are performed to analyze the autocorrelation, coherence time, and power spectral density for a person equipped with a wearable receive system moving at different speeds for different configurations and antenna positions. Diversity reception with multiple textile antennas integrated in the clothing provides a means of improving the reliability of the link. For the dynamic channel estimation, a scheme using hard decision feedback after MRC with adaptive low-pass filtering is demonstrated to be successful in providing robust data detection for long data bursts, in the presence of dramatic channel variation.

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Authors’ Affiliations

(1)
Information Technology Department (INTEC), Ghent University
(2)
Department of Telecommunications and Information Processing (TELIN), Ghent University
(3)
Hogeschool Gent, INWE Department

Copyright

© Patrick Van Torre et al. 2010

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.