混沌序列OFDM系统同步方法及性能比较  

Synchronization scheme using chaotic signal for OFDM systems and performance comparison

作　　者：罗仁泽[1] 邓洪敏[2] 朱维乐[1] 王汝言[3] 

机构地区：[1]电子科技大学电子工程学院,四川成都610054 [2]四川大学,四川成都610064 [3]重庆邮电学院通信与信息工程学院,重庆400065

出　　处：《系统工程与电子技术》2005年第1期31-32,162,共3页Systems Engineering and Electronics

摘　　要：提出了Logstic的一种利用改进映射产生的混沌序列进行OFDM系统时间同步和频率同步的方法,并与用训练序列在Rayleigh衰落信道下进行的同步作了性能比较。仿真表明,在进行OFDM系统同步时,采用混沌序列或训练序列具有近似的同步性能。理论分析表明:混沌序列具有低截获率、长度任意、数量多、相关性优良等优势。对于混沌序列在无线OFDM移动通信系统中的应用具有重要意义。Even though it is used in an FH spread spectrum system (FH/SS), chaotic sequence has almost not been published to be employed in the OFDM systems. A novel timing synchronization and frequency-offset estimation scheme based on chaotic sequence is proposed and compared with the scheme employing the training sequence in multi-path Rayleigh fading channels. Simulation shows that the proposed scheme has similar synchronization performance to that of the scheme based on the training sequences in OFDM systems. Compared with the training sequence, the chaotic sequence has advantages of lower probability of intercept (LPI), non-restricted length, larger aggregate, and better correlation properties, so it is useful and significant to take advantages of the chaotic sequences in OFDM systems.

关 键 词：OFDM系统 同步 混沌序列 低截获率 

分 类 号：TN919.3[电子电信—通信与信息系统]