计算机工程2012，Vol.38Issue(21)：89-92,4.DOI:10.3969/j.issn.1000-3428.2012.21.024
基于PN序列的OFDM时频同步改进算法
Improved OFDM Timing and Frequency Synchronization Algorithm Based on PN Sequence
摘要
Abstract
The correlation peak located in the initial position of Cyclic Prefix(CP) in training symbol has the similar intensity with the one at the correct timing position, which causes the timing error in Orthogonal Frequency-Division Multiplexing(OFDM) preamble-aided synchronization algorithms. To overcome the problem, a new synchronization training symbol is formed with the conjugated symmetrical training symbol by multiplying Pseudo-Noise(PN) weighted factor, this paper proposes a new timing metric as well as the corresponding algorithm of improved timing synchronization and frequency offset estimation based on the new structure of training symbol. The proposed algorithm eliminates cyclic prefix correlation peak effectively so as to overcome the inaccurate timing and improve the accuracy of frequency offset estimation by utilizing autocorrelation of the pseudo-random weighted factor. Simulation results show that the proposed algorithm not only improves the synchronization performance, but also reduces the computational complexity.关键词
正交频分复用/伪随机加权因子/定时同步/频偏估计/循环前缀Key words
Orthogonal Frequency-Division Multiplexing(OFDM)/ Pseudo-Noise(PN) weighted factor/ timing synchronization/ frequency offset estimation/ Cyclic Prefix(CP)分类
信息技术与安全科学引用本文复制引用
王振朝,孙博,王芳..基于PN序列的OFDM时频同步改进算法[J].计算机工程,2012,38(21):89-92,4.基金项目
河北省自然科学基金资助项目(F2009000224) （F2009000224）
河北省科技攻关计划基金资助项目(072135190) （072135190）
