基于多项式拟合的OFDM系统符号盲同步算法

Journal of Systems Engineering and Electronics ›› 2013, Vol. 35 ›› Issue (3): 619-623.

基于多项式拟合的OFDM系统符号盲同步算法

赵军辉^1,2,3，吕宸^1,3

1．北京交通大学轨道交通控制与安全国家重点实验室，北京 100044;
2. 东南大学移动通信国家重点实验室，江苏南京 210096;
3. 北京交通大学电子信息工程学院，北京 100044

出版日期:2013-03-20 发布日期:2010-01-03

Blind symbol synchronization algorithm for OFDM systems based on polynomial fitting

ZHAO Jun-hui^1，2,3， LVChen^1,3

1. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China; 
2. National Mobile Communication Laboratory, Southeast University, Nanjing 210096, China；
3. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China

Online:2013-03-20 Published:2010-01-03

摘要/Abstract

摘要：

提出了一种基于循环前缀的正交频分复用（orthogonal frequency division multiplexing，OFDM）系统定时同步的低复杂度算法。算法利用相关函数的结构性质，可以消除冗余信息，直接针对相关函数的峰值位置进行求解。同时，通过多项式来拟合同步函数，从而在保证得到正确的信道时延估计值的同时有效降低算法时间复杂度。仿真结果证明，本文算法在平坦衰落信道和频率选择性衰落信道下均能保持良好的性能，并且计算所需时间远小于其他基于循环前缀的盲同步算法。

Abstract:

A low complexity blind symbol synchronization algorithm based on cyclic prefix for orthogonal frequency division multiplexing (OFDM) systems is proposed.This algorithm can remove the redundant information of the correlation functions by its inner structural properties and can directly find the peak position. A synchronization function is derived by polynomial fitting. Meanwhile, the time complexity can be reduced effectively and the precision of the estimation of channel delay is guaranteed. Simulation results show that the algorithm can obtain a good performance under the frequency selective fading channels, and the required computing time is shortened significantly compared with other blind synchronization algorithms.

赵军辉，吕宸. 基于多项式拟合的OFDM系统符号盲同步算法[J]. Journal of Systems Engineering and Electronics, 2013, 35(3): 619-623.

ZHAO Jun-hui， LVChen. Blind symbol synchronization algorithm for OFDM systems based on polynomial fitting[J]. Journal of Systems Engineering and Electronics, 2013, 35(3): 619-623.