| 多径衰落信道下OFDM定时同步算法的研究 |
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| 引用本文： | 周恩,陈茅茅,王文博.多径衰落信道下OFDM定时同步算法的研究[J].北京邮电大学学报,2005,28(3):62-64. |
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| 作者姓名： | 周恩 陈茅茅 王文博 |
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| 作者单位： | 北京邮电大学,无线信号处理与网络实验室,北京,100876;北京邮电大学,无线信号处理与网络实验室,北京,100876;北京邮电大学,无线信号处理与网络实验室,北京,100876 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 利用循环前缀（CP）能量差分特性和集相关特性对已有的定时同步算法加以改进，提出了一种新的正交频分复用（OFDM）符号同步算法. 在多径衰落信道环境下，CP的能量差分特性和集相关特性在CP后部均未受到多径的破坏，所提算法优化利用了CP的这2种特性. 仿真结果表明，该算法在多径衰落信道下能获得较好的符号定时同步性能;同时消除了频偏对符号定时的影响，且在一定范围内随多普勒频移的增加，符号定时同步性能得到进一步改善.
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| 关 键 词： | 正交频分复用 循环前缀 符号定时同步 多径衰落信道 |
| 文章编号： | 1007-5321(2005)03-0062-03 |
| 修稿时间： | 2004年5月15日 |
A Novel Timing Estimation Method for OFDM Systems over Multipath Fading Channels |
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| ZHOU En,CHEN Mao-mao,WANG Wen-bo.A Novel Timing Estimation Method for OFDM Systems over Multipath Fading Channels[J].Journal of Beijing University of Posts and Telecommunications,2005,28(3):62-64. |
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| Authors: | ZHOU En CHEN Mao-mao WANG Wen-bo |
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| Affiliation: | Wireless Signal Processing and Network Laboratory , Beijing University of Posts and Telecommunications, Beijing 100876, China |
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| Abstract: | In orthogonal frequency division multiplexing (OFDM) system, the properties of cyclic prefix (CP) energy difference and set correlation are not destroyed at the back of CP in multipath fading channels. Optimum combined with the two merits, a new time synchronization method is proposed in this paper. Simulation results demonstrate that the proposed method has good timing estimation performance over multipath fading channels. And the proposed method is robust to the frequency offset and the performance will be further improved with the increasing of Doppler frequency shift. |
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| Keywords: | orthogonal frequency division multiplexing cyclic prefix symbol timing synchronization multipath fading channels |
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