| OFDM快速频偏估计方法 |
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| 引用本文： | 丁铭,罗汉文,吴赟,徐余法.OFDM快速频偏估计方法[J].哈尔滨工业大学学报,2009(9):91-95. |
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| 作者姓名： | 丁铭 罗汉文 吴赟 徐余法 |
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| 作者单位： | 上海交通大学电子工程系;上海电机学院 |
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| 基金项目： | 国家自然科学基金资助项目(60572157) |
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| 摘 要： | 提出一种基于前导符号为L等分结构的OFDM快速频偏估计的新方法,该方法只需一个OFDM符号作为前导符号,数据开销较小.接收端先用相关求相角的方法完成细频偏估计,再对经过细频偏补偿后的前导数据进行符号重构,然后对重构符号采用L点FFT运算,通过寻找频域信号峰值,对剩余频偏进行估计,从而完成粗频偏估计.为进一步降低系统的计算开销,采用了多级判决方式.计算机仿真表明,该方案具有计算复杂度低,估计性能较高的优点.
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| 关 键 词： | 正交频分复用 频偏 估计 符号重构 前导符号 |
Fast frequency offset estimation method for OFDM |
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| DING Ming,LUO Han-wen,WU Yun,XU Yu-fa.Fast frequency offset estimation method for OFDM[J].Journal of Harbin Institute of Technology,2009(9):91-95. |
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| Authors: | DING Ming LUO Han-wen WU Yun XU Yu-fa |
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| Affiliation: | 1.Dept.of Electronic Engineering,Shanghai Jiaotong University,Shanghai 200240,China; 2.Shanghai Dianji University,Shanghai 200110,China) |
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| Abstract: | A low-overhead oriented method for fast frequency offset estimation of OFDM is proposed,which uses only one OFDM symbol with L identical parts as preamble.By extracting the phase from correlation between two identical halves of the preamble,the fine estimation of frequency offset is obtained and then compensated.After reshaping the compensated preamble into many sub-symbols,L-point FFT algorithm is applied to these sub-symbols.Then,the coarse estimation of frequency offset is achieved by finding the maximum magnitude of resulting frequency domain signals.To further reduce the computational load of the system,the scheme is carried out by means of multistage estimation.Computer simulations show that the proposed method exhibits good estimation performance with low computational complexity. |
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| Keywords: | OFDM frequency offset estimation symbol reshaping preamble |
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