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Authors:
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Hiromi Ozaku
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Communications Research Laboratory, Ministry of Posts and Telecommunications
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Masao Utiyama
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Communications Research Laboratory, Ministry of Posts and Telecommunications
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Masaki Murata
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Communications Research Laboratory, Ministry of Posts and Telecommunications
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Kiyotaka Uchimoto
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Communications Research Laboratory, Ministry of Posts and Telecommunications
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Hitoshi Ishara
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Communications Research Laboratory, Ministry of Posts and Telecommunications
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