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International Journal of Antennas and Propagation
Volume 2010, Article ID 735434, 11 pages
http://dx.doi.org/10.1155/2010/735434
Research Article

Spatial and Temporal Variation of Wideband Indoor Channels

Department of Electronic and Computer Engineering, University of Portsmouth, Portsmouth PO1 3DJ, UK

Received 25 March 2010; Accepted 9 July 2010

Academic Editor: Ananda Sanagavarapu Mohan

Copyright © 2010 David L. Ndzi et al. 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.

Abstract

Extensive studies of the impact of temporal variations induced by people on the characteristics of indoor wideband channels are reported. Singular Value Decomposition Prony algorithm has been used to compute the impulse response from measured channel transfer functions. The high multipath resolution of the algorithm has allowed a detailed assessment of the shapes of individual multipath clusters and their variation in time and space in indoor channels. Large- and small-scale analyses show that there is a significant dependency of the channel response on room size. The presence of people in the channel has been found to induce both signal enhancements and fading with short-term dynamic variations of up to 30 dB, depending on the number of people and their positions within the room. A joint amplitude and time of arrival model has been used to successfully model measured impulse response clusters.