| 多径衰落信道下OFDM系统定时同步优化 |
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| 引用本文： | 赵军辉,吕宸.多径衰落信道下OFDM系统定时同步优化[J].北方交通大学学报,2011(3):91-93,98. |
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| 作者姓名： | 赵军辉 吕宸 |
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| 作者单位： | 北京交通大学电子信息工程学院,北京100044 |
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| 基金项目： | 北京邮电大学泛网无线通信教育部重点实验室开放课题（2009101）; 东南大学移动通信国家重点实验室开放研究基金资助课题（W200906）; 中央高校基本科研业务费专项资金资助项目（2009JBM012） |
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| 摘 要： | 在多径环境下,正交频分复用（OFDM）系统对第1径的寻找是解决定时同步的关键,多数算法将最强径当作第1径,使得定时同步向后延迟,造成严重的ISI.本文在PN训练定时同步的基础上,通过寻找滑动求和值的第1个下降沿来确定第1径的位置.仿真结果证明了本算法的优越性,同时在第1径不为最强径的情况下算法也能得到较好效果.
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| 关 键 词： | 正交频分复用 符号定时同步 多径衰落信道 |
An optimized estimation method for OFDM system under multipath fading channels |
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| Institution: | ZHAO Junhui,LU Chen(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | In the multipath channels,determining the first path is one of the key steps of OFDM system,but most previous methods assumed the strongest path as the first path,this makes the timing delay and introduces serious ISI.In the paper a new algorithm based on the timing synchronization algorithm using PN sequence is proposed.The timing of the first path is determined by detecting the first falling edge of the moving summation of the correlation results.Simulation results show that the performance of the new scheme is much better than the conventional synchronization algorithms in multipath environment. |
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| Keywords: | orthogonal frequency division multiplexing symbol timing synchronization multipath fading channels |
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