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| OFDM系统中一种符号定时和载波频率同步算法 | |
| 引用本文： | 陆震,王勇,葛建华.OFDM系统中一种符号定时和载波频率同步算法[J].华中科技大学学报(自然科学版),2007,35(6):30-33. |
| 作者姓名： | 陆震 王勇 葛建华 |
| 作者单位： | 1. 上海交通大学,电子信息与电气工程学院,上海,200240 2. 西安电子科技大学,综合业务网国家重点实验室,陕西,西安,710071 3. 上海交通大学,电子信息与电气工程学院,上海,200240;西安电子科技大学,综合业务网国家重点实验室,陕西,西安,710071 |
| 摘 要： | 针对正交频分复用(OFDM)系统提出了一种新的符号定时和载波频率同步算法.该算法将整个OFDM符号分成多段,在连续多个OFDM符号中采用相关累加的方法得到对系统同步的估计函数.当分段长度小于相邻OFDM符号间的无符号间干扰(ISI)区长度时,算法可以分辨这一区间,从而得到最优符号定时同步以及载波频偏估计.分析表明最大似然(ML)算法和Karthik算法是它的一种特殊情况,计算机仿真结果表明该算法不仅可以跟踪时变信道而且其均方估计误差(MSE)要远远小于最大似然(ML)估计. |
| 关 键 词： | 正交频分复用 符号定时同步 载波频率同步 OFDM 系统同步 符号间干扰 载波频率 同步算法 systems frequency synchronization timing symbol 估计误差 均方 时变信道 跟踪 仿真结果 计算机 情况 最大似然 分析表 载波频偏估计 定时同步 |
| 文章编号： | 1671-4512（2007）06-0030-04 |
| 修稿时间： | 2006-05-10 |
New algorithm for symbol timing and frequency synchronization in OFDM systems |
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| Lu Zhen,Wang Yong,Ge Jianhua.New algorithm for symbol timing and frequency synchronization in OFDM systems[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2007,35(6):30-33. | |
| Authors: | Lu Zhen Wang Yong Ge Jianhua |
| Abstract: | A new symbol timing and carrier frequency synchronization scheme applicable to orthogonal frequency division multiplexing(OFDM) system was presented.The OFDM symbol was divided into several parts.We used correlation and accumulation in several OFDM symbols to acquire estimation function for synchronization.When the length of part was smaller than that of ISI(Inter-symbol interference) free region,the estimator can distinguish it.Then optimal symbol timing and carrier frequency offset can be acquired.Analysis showed ML and Karthik algorithm were special cases of the presented method.The computer simulation results show that the proposed algorithm can track time varying channel condition and has much smaller MSE(mean square error) than that of ML estimation algorithms. |
| Keywords: | orthogonal frequency division multiplexing symbol timing synchronization carrier frequency synchronization |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |