| 一种基于短时傅里叶变换的OFDM时间同步方法 |
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| 引用本文： | 邝育军, 乐光新. 一种基于短时傅里叶变换的OFDM时间同步方法[J]. 电子与信息学报, 2004, 26(3): 453-458. |
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| 作者姓名： | 邝育军 乐光新 |
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| 作者单位： | 北京邮电大学电信工程学院,北京,100876;北京邮电大学电信工程学院,北京,100876 |
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| 基金项目： | 国家自然科学基金(60172052,90104018)，863国家重大项目(2001AA123016)资助课题 |
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| 摘 要： | 该文提出了一种基于短时傅里叶变换的OFDM符号同步方法。该方法通过短时傅里叶变换得到OFDM信号的二维幅度谱,并提取其中的周期平稳时频结构信息,估计出OFDM符号的无ISI时间区间,并选取该区间的最佳位置作为OFDM符号起始位置估计。仿真结果表明:该方法相对于常规的时间相关算法能有效地对抗低信噪比环境。
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| 关 键 词： | 正交频分复用 时间同步 循环前缀 短时傅里叶变换 |
| 文章编号： | 1009-5896(2004)03-0453-06 |
| 收稿时间： | 2002-09-24 |
| 修稿时间： | 2002-09-24 |
A Short-Time Fourier Transform Based Symbol Timing Atpproach for OFDM Systems |
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| Kuang Yu-jun, Yue Guang-xin. A Short-Time Fourier Transform Based Symbol Timing Atpproach for OFDM Systems[J]. Journal of Electronics & Information Technology, 2004, 26(3): 453-458. |
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| Authors: | Kuang Yu-jun Yue Guang-xin |
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| Affiliation: | Telecom. Eng. School Beijing Univ. of Posts and Telecomm.,Beijing 100876 China |
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| Abstract: | A blind short-time Fourier transform based approach for symbol timing in OFDM systems is proposed. The key of the described algorithm leans upon the periodic 2-D time-frequency spectrum structure. By searching the flat regions in the time direction of time-frequency spectrum of the received signal, ISI-free intervals are estimated, where optimum symbol start can be easily located. Simulation results show that the proposed algorithm is quite robust against low SNR environment, and outperforms time-domain correlation based algorithms. |
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| Keywords: | OFDM Time synchronization Cyclic prefix Short-time Fourier transform (STFT) |
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