OFDM系统中利用PN序列实现符号同步的3种算法  

Three Symbol Synchronization Algorithms Based on PN Sequence for OFDM Systems

作　　者：陈丽[1] 

机构地区：[1]中国人民解放军昆明陆军学院,昆明650207

出　　处：《重庆工学院学报（自然科学版）》2009年第1期113-116,共4页Journal of Chongqing Institute of Technology

基　　金：国家自然科学基金资助项目(30570473);重庆市自然科学基金资助项目(2005BB2195)

摘　　要：研究了基于重复PN训练序列符号的延迟相关算法、基于已知PN训练序列的符号定时同步算法、基于共轭对称结构的PN训练序列符号对称算法在高速运行多径衰落环境下的性能.通过对3种算法的性能比较,得出结论:基于共轭对称结构的PN训练序列符号对称算法不仅在高速运行多径衰落情况下可以得到很好的估计性能,而且不易受载波频偏的影响,是一种适用于高速运行多径快衰落环境的符号同步算法.Symbol synchronization is a key problem of orthogonal frequency-division multiplexing （OFDM） system. This paper compares and analyses the performance of three kinds of symbol synchronization algo- rithms based on PN sequence in high speed multi-path fading environment： the synchronization algorithm based on repeated training sequence, the synchronization algorithm based on known PN training sequence, and the symmetric algorithm of PN training sequence based on conjugate symmetric structure. Through the comparison, the conclusion is reached that： the symmetric algorithm of PN training sequence based on conjugate symmetric structure can not only get very good estimating performance in the high speed multi-path fading environment channel, but also be less influenced by frequency offset. Thus the arithmetic is more suitable to be used in symbol synchronization in high speed multi-path fading environment.

关 键 词：正交频分复用 符号同步 PN序列 

分 类 号：TN911[电子电信—通信与信息系统]