燕山大学学报2011，Vol.35Issue(5)：455-458,4.DOI:10.3969/j.issn.1007-791X.2011.05.016
基于差分和集相关的OFDM定时同步算法的改进
An improved timing and frequency estimation method for OFDM systems based on energy difference and set correlation
郭欣欣 1吴长奇 1司瑞华 1卢海涛1
作者信息
- 1. 燕山大学信息科学与工程学院,河北秦皇岛066004
- 折叠
摘要
Abstract
Synchronous technology is the key technology for realization of OFDM systems in multi-path fading channels. But the performance of existing tuning synchronization algorithms is not ideal under low SNR. In order to improve the performance of the timing synchronization, an improved timing synchronization method based on energy difference and set correlation is proposed in this paper. By using multiple point in set correlation and choosing appropriate weighting coefficients, the algorithm make use of the two merits selectively under different SNR. The modified method can work with no loss of performance in high SNR environments, and also can get accurate timing in low SNR environments. Simulation results shows that the wrong judgment rate of the improved algorithm is lower in symbol timing, especially when SNR is low. As the algorithm doesn't use the frequency shift estimation, it isn't affected by frequency shift in symbol timing.关键词
符号定时同步/差分相关/集相关/加权组合Key words
symbol timing synchronization/ energy difference correlation/ set correlation/ weighting combination分类
信息技术与安全科学引用本文复制引用
郭欣欣,吴长奇,司瑞华,卢海涛..基于差分和集相关的OFDM定时同步算法的改进[J].燕山大学学报,2011,35(5):455-458,4.
