| 瑞利衰落信道下改进的OFDM符号定时算法 |
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| 引用本文： | 吴赟,罗汉文,宋文涛.瑞利衰落信道下改进的OFDM符号定时算法[J].电波科学学报,2006,21(6):825-829. |
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| 作者姓名： | 吴赟 罗汉文 宋文涛 |
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| 作者单位： | 上海交通大学电子工程系,上海,200240 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家自然科学基金 |
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| 摘 要： | 对相干OFDM系统中结合循环前缀和导频信息的传统符号定时同步算法进行了分析和研究,提出了一种改进的符号定时同步算法.此算法相对于传统算法由于更加有效的利用了观察样本信息,具有更大的定时同步范围.同时考虑时间偏移参数在若干OFDM符号区间内不变,给出了一种利用连续多个OFDM符号的算法,以提高定时同步的准确度.仿真验证了所提出算法在瑞利衰落信道下可以有效地改进传统算法的定时性能.
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| 关 键 词： | 符号定时同步 最大似然函数 循环前缀 |
| 文章编号： | 1005-0388（2006）06-0825-05 |
| 收稿时间： | 2005-06-06 |
| 修稿时间： | 2005年6月6日 |
An improved symbol timing recovery algorithm for OFDM systems in rayleigh fading channels |
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| WU Yun,LUO Han-wen,SONG Wen-tao.An improved symbol timing recovery algorithm for OFDM systems in rayleigh fading channels[J].Chinese Journal of Radio Science,2006,21(6):825-829. |
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| Authors: | WU Yun LUO Han-wen SONG Wen-tao |
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| Affiliation: | Dept. of Electronic Eng. , Shanghai Jiao Tong Univ. , Shanghai 200240, China |
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| Abstract: | The conventional algorithm, which exploits both the redundancy in the cyclic prefix and available pilot symbols for symbol time recovery, is analyzed and an improved symbol time recovery algorithm is proposed. By utilizing the correlation property of the observation samples more efficiently, the proposed algorithm has a larger time offset estimation range. On the other hand, by considering the symbol timing offset as a fixed value over several OFDM symbol blocks, the estimation performance is improved further by using the information of the multiple OFDM symbol blocks. Simulation results demonstrate the proposed symbol timing recovery method in Rayleigh fading channel has an improved performance over the conventional algorithm. |
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| Keywords: | OFDM |
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