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M. Hayakawa
The University of Electro-Communications.
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I. Tomizawa
The University of Electro-Communications.
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K. Ohta
Department of Electronic Engineering, Chubu University.
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S. Shimakura
Department of Electrical and Electronic Engineering, Chiba University.
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Y. Fujinawa
National Research Institute of Earth Science and Disaster Prevention.
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K. Takahashi
Communications Research Laboratory.
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T. Yoshino
The University of Electro-Communications.
