基于训练序列的OFDM频率同步改进算法
针对现有正交频分复用（OFDM）通信系统中频率同步算法存在的同步精度不高、估计范围较小等问题,设计了一种训练序列结构,并给出了相应的估计函数,提出了基于训练序列的频率同步改进算法。频率同步改进算法是在准确的符号定时之后,根据时域训练序列结构的共轭对称性,利用新的度量函数求出小数倍频偏;根据接收端频域训练序列的循环移位估计整数倍频偏。理论分析和仿真结果表明,改进算法频偏估计的均方误差较低,扩大了小数倍频偏估计范围,提高了整数倍频偏的正确检测概率。...
Saved in:
| Published in: | 电子技术应用 Vol. 43; no. 3; pp. 104 - 107 |
|---|---|
| Main Author: | |
| Format: | Journal Article |
| Language: | Chinese |
| Published: |
天津理工大学计算机与通信工程学院,天津,300384
2017
|
| Subjects: | |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 针对现有正交频分复用（OFDM）通信系统中频率同步算法存在的同步精度不高、估计范围较小等问题,设计了一种训练序列结构,并给出了相应的估计函数,提出了基于训练序列的频率同步改进算法。频率同步改进算法是在准确的符号定时之后,根据时域训练序列结构的共轭对称性,利用新的度量函数求出小数倍频偏;根据接收端频域训练序列的循环移位估计整数倍频偏。理论分析和仿真结果表明,改进算法频偏估计的均方误差较低,扩大了小数倍频偏估计范围,提高了整数倍频偏的正确检测概率。 |
|---|---|
| Bibliography: | In this paper, a new training sequence is designed and an improved frequency synchronization method is proposed for OFDM systems, aim to overcome the low synchronization precision and the small estimation range. The proposed method is based on training sequence to estimate, and the corresponding carrier frequency offset（CFO） estimation function is presented. After accurate timing synchronization, the fractional frequency offset（FFO） can be obtained by using the new metric function, according to the con- jugate characteristic of the training sequence structure in the time domain. And the integer frequency offset （IFO） can be estimated by the cyclic shift of the training sequence of the received signal in the frequency domain. Theoretical analysis and simulation re- sults show that the mean square error（MSE） of the frequency offset estimation is relatively low, and the range of fractional frequen- cy offset estimation is expanded, the correct detection probability of the integer frequency offset is higher than |
| ISSN: | 0258-7998 |
| DOI: | 10.16157/j.issn.0258-7998.2017.03.026 |