一种基于OFDM信号周期平稳特性的系统时延和频偏的盲估计算法  

A cyclostationarity-based,blind algorithm for estimating delay and frequency offset in 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,合肥230027

出　　处：《信号处理》2006年第5期620-624,共5页Journal of Signal Processing

基　　金：国家自然科学基金0649314;教育部博士点基金支持

摘　　要：该文首先提出一种基于信号周期平稳特性的OFDM系统时延和频偏的盲估计算法,然后分析算法,获得一种可以估计非整数倍样点周期的时延和扩大频偏估计范围,实现整个OFDM系统带宽范围内的频偏估计的方法,并指出本算法可以在信道未知的情况下获得好的估计性能,最后给出相应的仿真结果。理论分析和仿真结果表明,本算法有很好的抗噪特性、强的变化信道适应性,与同类方法比较,具有更高的估计精度、估计非整数倍样点周期时延和扩大频偏估计范围的能力。A cyclostationarity-based,blind algorithm for estimating delay and frequency offset in the OFDM system is presented in this paper first, then by analyzing this algorithm, a method is got, which can not only estimate a timing offset that 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 盲时延和频偏估计 

分 类 号：TN914.5[电子电信—通信与信息系统]