基于高次数据拟合OFDM系统快时变信道估计算法  

Channel estimation method for rapidly time-vary channel based on high-order data fitting in OFDM systems

作　　者：段鹏[1] 何明一[1] 薛敏彪[1,2] 党群[2] 

机构地区：[1]西北工业大学电子信息学院,西安710072 [2]西北工业大学365研究所,西安710065

出　　处：《计算机应用研究》2011年第2期681-684,共4页Application Research of Computers

基　　金：国家"863-705"主题资助项目(2004AA752022);陕西省2010 年度工业攻关项目(2010K06-09)

摘　　要：针对快时变信道估计参数多且估计复杂度大的问题,提出了一种基于高次数据拟合的快时变信道估计算法。该方法首先利用导频的周期性,在时域对一个OFDM符号内的信道进行分段估计,以减少时变信道被估参数;并且基于高次数据拟合方法对其进行曲线拟合,实现了对快时变信道的多点拟合;最后通过对拟合系数的残差误差分析,得到最佳拟合系数,从而进一步提高估计准确度。理论分析与仿真结果均验证了该方法在快速时变信道下的有效性。In order to further reduce the calculation complexity and estimated parameter,proposed a novel channel estimation method for rapidly time-vary channel based on data fitting.Utilized the periodic characteristic of PN sequence,separated channel into some blocks in an OFDM symbol in time domain,the number of estimated parameter could be reduced;then used the high-order data fitting method,the more pilot tones could be used in data fitting,finally,calculated the residual error of fitting parameter,got the optimum fitting parameter,and improved the accuracy of channel estimation efficiently.Theory and experiments show that method of validate in rapidly time-vary channel circumstances.

关 键 词：正交频分复用 信道估计 时变信道 高次数据拟合 

分 类 号：TN911.23[电子电信—通信与信息系统]