一种OFDM系统同步参数盲估计方法  

Approach to blind synchronization parameters estimation for OFDM systems

作　　者：郭里婷[1] 朱近康[1] 

机构地区：[1]中国科学技术大学个人通信与扩频实验室

出　　处：《通信学报》2005年第9期35-40,45,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(60241003);教育部博士点基金项目

摘　　要：首先提出一种扩大周期平稳信号循环周期的方法,然后在此基础上提出一种基于信号周期平稳特性的盲同步参数快速估计算法,最后通过分析算法获得一种可以估计非整数倍样点周期时延和扩大频偏估计范围的方法,从而实现整个OFDM基带带宽范围内的频偏估计。理论分析和仿真结果表明,该算法仅用很少的OFDM符号就可以实现同步参数的估计、有好的抗噪特性、衰落信道适应性和高的估计精度。A method for increasing the cyclic period of a cyclostationary signal was first proposed. Then based on it, a cyclostationarity-based, blind algorithm for estimating synchronization parameters in the OFDM system was presented. Finally through analyzing this algorithm, a method was got, which can not only estimate a timing offset which is not an integer multiple of one OFDM sample duration, but also enlarge the frequency offset estimation range, thus, a frequency offset estimation over the entire bandwidth of the OFDM system is possible. Theory analysis and simulation results are provided to show that the proposed algorithm can get more accurate synchronization parameters estimation with few OFDM symbols, meanwhile it is immune to the noise and adapts to the fading channel.

关 键 词：OFDM 周期平稳特性 盲同步参数估计 

分 类 号：TN91[电子电信—通信与信息系统]