中国空间科学技术2011，Vol.31Issue(6)：58-64,72,8.DOI:10.3780/j.issn.1000-758X.2011.06.009
正交频分复用系统中一种抗多径衰落的联合时频同步算法
Robust Timing and Frequency Synchronization under Multipath Fading Channel for Orthogonal Frequency Division Multiplexing Systems
刘程贞 1金蓬嘉 1昊学英2
作者信息
- 1. 上海航天电子有限公司,上海201821
- 2. 中国空间技术研究院,北京100094
- 折叠
摘要
Abstract
A synchronization scheme for orthogonal frequency division multiplexing (OFDM) systems based on a novel training sequence was proposed. The training sequence consists of only one centrosymmetric OFDM symbol with two identical parts to achieve reliable timing and frequency accuracy in the time-domain. After coarse timing and fractional frequency synchronization achieved, a successful estimation was declared for both channel path timing and integer frequency offset by IFFT algorithm which can largely reduce the computational load of the algorithm. For fine timing synchronization, a metric called signal-to-interference ratio (SIR) was devised. Based on this metric, a fine timing synchronization method was developed to improve the timing precision. Comparison of the proposed fine adjustment algorithm and conventional synchronization algorithms by using computer simulation illustrates that the method is more robust to multipath and pseudo multipath.关键词
正交频分复用/同步/多径信道/卫星通信Key words
Orthogonal frequency division multiplexing/Synchronization/Multipath channel Satellite communication引用本文复制引用
刘程贞,金蓬嘉,昊学英..正交频分复用系统中一种抗多径衰落的联合时频同步算法[J].中国空间科学技术,2011,31(6):58-64,72,8.
