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| 基于最大似然算法的OFDM频偏估计研究 | |
| 引用本文： | 赵黎,张燕,石介沛,祝捷. 基于最大似然算法的OFDM频偏估计研究[J]. 电子设计工程, 2011, 19(13): 96-98 |
| 作者姓名： | 赵黎 张燕 石介沛 祝捷 |
| 作者单位： | 1. 西安工业大学电子信息工程学院,陕西西安,710032 2. 陕西工业职业技术学院电气工程系,陕西咸阳,712000 3. 兰州军区68026部队,甘肃兰州,730000 |
| 摘 要： | 由于OFDM的高频谱利用率和传输可靠性均是以子载波间的正交性为基础的,因此对OFDM符号的频率偏差进行有效的估计和补偿具有非常重要的意义。由于多载波系统几乎都采用插入循环前缀的方法来消除符号间干扰,引入循环前缀后,每对间隔为N的样值之间具有相关性,因此利用循环前缀所携带的信息,采用最大似然估计方法进行频率偏差的估计,最后通过Monte Carlo方法对其进行了仿真验证,结果显示估计频偏与实际频偏的偏差很小。 |
| 关 键 词： | 正交频分复用 最大似然算法 频率偏差 循环前缀 符号间干扰 |
Research on the frequency offset estimation for OFDM based on ML algorithm |
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| ZHAO Li,ZHANG Yan,SHI Jie-pei,ZHU Jie. Research on the frequency offset estimation for OFDM based on ML algorithm[J]. Electronic Design Engineering, 2011, 19(13): 96-98 | |
| Authors: | ZHAO Li ZHANG Yan SHI Jie-pei ZHU Jie |
| Affiliation: | 1(1.School of Electronic Information Engineering,Xi’an Technological University,Xi’an 710032,China; 2.School of Electrical Engineering,Shaanxi Vocational of Technlogy,Xianyang 712000,China; 3.68026 Forces,Lanzhou Military Region,Lanzhou 730000,China) |
| Abstract: | Because the high spectrum efficiency and transmission reliability for OFDM are based on the orthogonality between the sub-carriers,it has very important significance to estimate and compensate the frequency deviation for OFDM symbol effectively.Since almost multi-carrier system through inserting the cyclic prefix to eliminate ISI,and the samples of each N interval has the correlation after the introduction of the cyclic prefix,the Maximum Likelihood algorithm was employed to estimate the frequency deviation.At last,the algorithm was confirmed by Monte Carlo approach,the results indicate that the deviation between the estimated frequency deviation and the actual frequency deviation is very small. |
| Keywords: | Orthogonal Frequency Division Multiplexing maximum likelihood algorithm frequency offset cyclic prefix inter-symbol interference |
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