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Hyun-Il Yoo, Young-Jun Kim, Kyung-Soo Woo, Jaekwon Kim, Sangboh Yun, Yong Soo Cho. A Hierarchical Preamble Design Technique for Efficient Handovers in OFDM-Based Multi-Hop Relay Systems. IEICE Transactions, 92-B(12):3907-3910, 2009. [doi]