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    題名: Using Hierarchical Carrier Modulations in the Detection of Carrier Frequency Offset for OFDM Communications
    作者: Lee, Yang-Han;Tseng, Hsien-Wei;Lee, Wei-Chen;Yen, Liang-Yu;Hsiao, Yu-Lin;Wu, Jing-Shown;Tsao, Hen-Wai
    貢獻者: 淡江大學電機工程學系
    關鍵詞: Carrier Frequency Offset (CFO);Hierarchical Modulation;Doppler Shift;OFDM
    日期: 2013-09-01
    上傳時間: 2014-01-21 23:20:59 (UTC+8)
    出版者: 新北市:淡江大學
    摘要: In this study, we use hierarchical modulation technology to estimate the carrier frequency of fset (CFO) caused by the Doppler effect; and hierarchical modulation has been implemented in the orthogonal frequency-division multiplexing (OFDM) system. Different threshold levels have been used to demodulate various bits of the hierarchical modulated symbols and it has the characteristic that the bit error rate (BER) of each set decision levels depends on the CFO extent. Consequently when a receiver signal suffers a CFO effect; this CFO extent can be estimated from its resulting BER curves. Pilot signals have been hierarchically modulated and used as the test signal in the simulation of OFDM system to estimate the CFO effect resulting from the movement of the mobile stations. The simulation result shows that the actual BER is higher than the mathematically analyzed BER for each decision level, which results in the overestimation of the CFO extent.
    關聯: 淡江理工學刊=Journal of Applied Science and Engineering 16(3), pp.287-294
    DOI: 10.6180/jase.2013.16.3.08
    顯示於類別:[電機工程學系暨研究所] 期刊論文

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