Experimental spatial correlation characteristics of propagation channels in indoor environments
ABSTRACT Spatial auto- and cross-correlation characteristics of propagation channels are investigated for four indoor scenarios using measurement data. In addition to the well-known spatial auto-correlation effect, significant cross-correlation between channels is also observed. We found that non-zero spatial cross-correlation among channels may occur in three scenarios with possibly different mechanisms. These results should be considered when establishing realistic models for the spatial cross-correlation behavior of channels.
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- "Furthermore, the modeling of SSF, which is closely related to the correlation of two components in different channels, has never been seriously considered, mostly because the uncorrelated scattering assumption is usually considered valid, and is therefore adopted in most cases. Recent studies addressed in , , and  have demonstrated that, for indoor propagation, the correlation of channels with the same location for the TX and different RXs can be significantly high. This is observable in indoor environments with corridor structures. "
ABSTRACT: In this paper, stochastic models for the cross-correlation of multiple channels are established based on measurement data collected using a wideband multiple-input multiple-output relay Band Exploration and Channel Sounder system at 3.7 GHz. We propose models for the cross-correlation characteristics of large-scale parameters (LSPs) between two links, that is, the base station and mobile station (MS) link and the relay station and MS link. The LSPs include shadow fading, Rician K-factor, delay spread, angle spread of arrival, and angle spread of departure. Furthermore, models are established for the cross-correlation of the small-scale fading in the impulse responses of two links. The statistics of these model parameters are investigated as functions of geometrical features of the multilink. They are extracted from a large amount of cross-correlation observations, which are obtained in three measurement sites along more than one hundred measurement routes. These models can be used together with the standard single-link channel models for the generation of correlated components, for example, path clusters, in two separate channels.Etri Journal 12/2012; 34(6). DOI:10.4218/etrij.12.1812.0039 · 0.77 Impact Factor
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ABSTRACT: In this paper, stochastic modeling of the cross-correlation of small-scale fading (SSF) is performed for co-existing propagation channels based on measurement data collected using the relay-Band-Exploration-and-Channel-Sounder (rBECS) systems in urban areas, Korea. We define six geometrical parameters which are considered as variables in the cross-correlation models proposed. These parameters characterize the geographic properties of a three-node co-operative relay system that consists of a base station, a relay station and a mobile station. The sensitivity of the distribution of SSF cross-correlation coefficients with respect to the proposed variables is assessed. Three of them are identified as sensible variables for modeling.Communications (APCC), 2012 18th Asia-Pacific Conference on; 01/2012
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ABSTRACT: In this contribution, stochastic models are established for the cross-correlation of the small-scale fading (SSF) in the impulse responses of two co-existing channels in cooperative relay scenarios based on measurement data collected using the wideband multiple-input multiple-output (MIMO) relay-Band-Exploration-and-Channel-Sounder (rBECS). The models extracted describe the variation of SSF cross-correlation coefficients with respect to geometrical variables in a three-node relay system, i.e. the angle between the direct link from the mobile station to the base station and that from the mobile station to the relay station, the average length of these two links, and the ratio between the length of the two links. It is observed that the parameters describing the distribution of the SSF cross-correlation coefficients can be modeled as analytical functions with respect to the aforementioned variables. These results are of importance for understanding the joint characteristics of co-existing wideband propagation channels in reality.Antennas and Propagation (EUCAP), 2012 6th European Conference on; 01/2012