A Novel Environment Characterization Metric for Clustered MIMO Channels |
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Authors: | Nicolai Czink Giovanni Del Galdo Xuefeng Yin Ernst Bonek Juha Ylitalo |
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Affiliation: | (1) Telecommunications Research Center Vienna (ftw.), Vienna, Austria;(2) Communications Research Laboratory, Ilmenau University of Technology, Ilmenau, Germany;(3) Department of Electronics Systems, Aalborg University, Aalborg, Denmark;(4) Institute of Communications and Radio-Frequency Engineering, Vienna University of Technology, Vienna, Austria;(5) Elektrobit, Oulu, Finland |
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Abstract: | In this work we introduce a novel metric for characterizing the double-directional propagation environment and use this metric
to assess the performance of a SAGE parameter estimator for MIMO channels. Using the IlmProp, a geometry-based MIMO channel
modeling tool, we construct synthetic channels for three different scenarios showing: (i) well separated clusters containing
dense propagation paths, and single-bounce scattering; (ii) partly overlapping clusters containing widely spread propagation
paths, and single-bounce scattering; (iii) unclustered multipath components (“rich scattering”), and double-bounce-only scattering.
We model the scatterers and the receiver in the environment as fixed, but the transmitter as moving. The Initialization and
Search-Improved SAGE (ISIS) estimation tool is used to extract the propagation paths from the constructed channels. Both true
and estimated paths are fed to the new system-independent metric which genuinely reflects the structure of the channel and
the compactness of the propagation paths. We use this metric to decide on the accuracy of the channel estimator. The results
show a convincing agreement between true and estimated paths. |
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Keywords: | MIMO channel Performance metrics Clustering |
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