| 正交频分复用在水声通信中频率同步的研究 |
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| 引用本文： | 王明华,桑恩方.正交频分复用在水声通信中频率同步的研究[J].应用声学,2007,26(2):93-99. |
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| 作者姓名： | 王明华 桑恩方 |
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| 作者单位： | 哈尔滨工程大学水声工程学院,哈尔滨,150001 |
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| 摘 要： | 正交频分复用（OFDM）通信系统对频率偏移比较敏感，容易导致系统性能急剧下降。水声通信中存在着严重的多普勒频率偏移，限制了OFDM技术在水下的应用。本文仿真分析了频率偏移对OFDM系统的性能影响，提出了一种适用于水声通信的频率同步方法。本方法不仅可以对固定的频率偏移进行估计，也可以对连续变化的频率偏移进行估计。仿真表明，本方法具有较高的频偏估计精度和大的频偏估计范围。湖试结果也表明，采用这种方法可有效地进行频偏估计。
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| 关 键 词： | 正交频分复用 频率同步 水声通信 |
| 修稿时间： | 2005-12-092006-11-27 |
Frequency synchronization for OFDM underwater acoustic communication |
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| WANG Ming-Hua and SANG En-Fang.Frequency synchronization for OFDM underwater acoustic communication[J].Applied Acoustics,2007,26(2):93-99. |
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| Authors: | WANG Ming-Hua and SANG En-Fang |
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| Institution: | College of Underwater Acoustics Engineering, Harbin Engineering University, Harbin 150001 |
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| Abstract: | OFDM(Orthogonal Frequency Division Multiplexing)systems are sensitive to frequency offset,which will degenerate the system performance.Due to the severe Doppler shift,the application of OFDM in underwater acoustic channel is limited.In this paper,the effect of frequency offset on the performance of OFDM systems is analyzed. We propose a frequency synchronization method that is suitable for underwater acoustic communication.Simulation results have shown that this method has high estimation precision and it could track wide range of frequency offset.The method is also effective when tested in a lake;it can improve the system performance. |
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| Keywords: | Orthogonal frequency division multiplexing Frequency synchronization Underwater acoustic communication |
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