[1]黄毅,胡爱群,成月良,等.一种基于OFDM训练序列的精确时延估计方法[J].东南大学学报(自然科学版),2014,44(1):7-11.[doi:10.3969/j.issn.1001-0505.2014.01.002]
　Huang Yi,Hu Aiqun,Cheng Yueliang,et al.Accurate time delay estimation scheme based on training sequence in OFDM systems[J].Journal of Southeast University (Natural Science Edition),2014,44(1):7-11.[doi:10.3969/j.issn.1001-0505.2014.01.002]
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一种基于OFDM训练序列的精确时延估计方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第1期
页码:
7-11
栏目:
信息与通信工程
出版日期:
2014-01-18

文章信息/Info

Title:
Accurate time delay estimation scheme based on training sequence in OFDM systems
作者:
黄毅1; 胡爱群1; 成月良2; 谢胜东1; 3
1东南大学信息安全研究中心, 南京 210096; 2国电南瑞南京控制系统有限公司, 南京 210003; 3南京信息工程大学计算机与软件学院, 南京 210044
Author(s):
Huang Yi1;  Hu Aiqun1;  Cheng Yueliang2;  Xie Shengdong1; 3
1Research Center of Information Security, Southeast University, Nanjing 210096, China
2NARI-TECH Control Systems Co., Ltd., Nanjing 210003, China
3Computer and Software Institute, Nanjing University of Information Science and Technology, Nanjing 210044, China
关键词:
差分互相关法;  时延估计;  OFDM
Keywords:
differential cross-correlation;  time delay estimation;  orthogonal frequency division multiplexing(OFDM)
分类号:
TN929
DOI:
10.3969/j.issn.1001-0505.2014.01.002
摘要:
提出了一种适用于OFDM系统的基于训练序列的精确时延估计方法.该方法利用频域差分互相关法,精确提取小数时延;在频域补偿小数时延后,再将时域相关法与上升沿法相结合,得到整数时延.由复杂度分析结果可知,当搜索法中获取小数时延的搜索次数大于2时,该方法的小数时延估计计算复杂度与搜索法相比低很多.仿真结果显示,当采样频率为10 MHz、多普勒频移为222.22 Hz、子载波个数为1 024的情况下,根据该方法所实现的时延估计精度能够达到分米级,平均比搜索法高出10 dB;同时,在低信噪比时,该方法比传统的时域相关法具有更健壮的整数时延估计性能.
Abstract:
An accurate time delay estimation scheme based on training sequence in orthogonal frequency division multiplexing(OFDM)systems is proposed. The scheme employs differential cross-correlation technology to extract the fractional delay in the frequency domain. Then, correlation technology and leading edge method are used to obtain the integer delay after compensation for the fractional delay in the frequency domain. The complexity analysis results show that if the number of searches for estimating the fractional delay is greater than two in the searching method, the computational complexity in the fractional delay estimation of the proposed algorithm is much lower than that of the searching method. The simulation results show that the proposed scheme can achieve an accuracy of decimeter level in the sampling frequency of 10 MHz, the Doppler shift of 222.22 Hz and the number of subcarriers of 1 024, which is about 10 dB higher than that of the searching method on average. Moreover, the proposed scheme has a more robust integer delay estimation performance than the traditional correlation technology even at low signal-to-noise ratio(SNR).

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2013-05-31.
作者简介: 黄毅(1984—),男,博士生;胡爱群(联系人),男,博士,教授,博士生导师,aqhu@seu.edu.cn.
基金项目: 国家高技术研究发展计划(863计划)资助项目(2013AA014001)、“十二五”国家科技支撑计划资助项目(2012BAH38B05).
引用本文: 黄毅,胡爱群,成月良,等.一种基于OFDM训练序列的精确时延估计方法[J].东南大学学报:自然科学版,2014,44(1):7-11. [doi:10.3969/j.issn.1001-0505.2014.01.002]
更新日期/Last Update: 2014-01-20