| 基于ML和导频联合的OFDM同步研究 |
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| 引用本文： | 许家富,张应慧,王华奎.基于ML和导频联合的OFDM同步研究[J].电脑开发与应用,2007,20(11):26-28. |
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| 作者姓名： | 许家富 张应慧 王华奎 |
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| 作者单位： | 太原理工大学,太原,030024;太原理工大学,太原,030024;太原理工大学,太原,030024 |
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| 摘 要： | 研究了如何将最大似然算法(ML)应用于OFDM系统,并且对该算法进行了改进。ML算法是利用相邻符号中循环前缀的相关性进行时频同步估计,但是其在进行频偏估计时只能进行小数倍频偏估计。当采用最大似然算法联合插入导频做系统同步时,就能同时进行小数和整数倍频偏估计。采用联合算法后,系统的误码率有了明显的下降,接近于理想同步的效果。仿真结果验证了该联合算法的有效性和实用性。
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| 关 键 词： | OFDM 符号同步 载波同步 最大似然算法 导频 |
| 文章编号： | 1003-5850（2007）11-0026-03 |
| 收稿时间： | 2007-07-29 |
| 修稿时间： | 2007-09-15 |
Research of Synchronization of OFDM based on ML and Pilots |
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| Xu Jiafu et al.Research of Synchronization of OFDM based on ML and Pilots[J].Computer Development & Applications,2007,20(11):26-28. |
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| Authors: | Xu Jiafu |
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| Affiliation: | Xu Jiafu et al |
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| Abstract: | In this paper,we do the research how to use the maximum likelihood(ML) algorithm to resolve on the synchronization of OFDM system.Besides,we improve the algorithm.The algorithm exploits the correlation of cyclic prefixes in adjacent symbols to perform time and frequency synchronization,but it only acquires fractional frequency offsets.We can acquire fractional and integral frequency offsets when joint ML algorithm and pilots.After adopting the joint algorithm,BER of the system will acquire evident decreases,close to ideal synchronization.Simulation results verify its validity and practicability. |
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| Keywords: | OFDM symbol synchronization frequency synchronization maximum likelihood(ML) algorithm pilot |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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