OFDM系统中一种有效的定时和频偏估计方法

为了在没有任何导频信息的条件下,实现OFDM(orthogonal frequency division)系统中的符号定时和频偏估计算法.提出了一种重复训练后缀的OFDM信号结构,并给出了一种有效的符号定时和频偏估计方法.该方法对ZP(zero padding)-OFDM信号形式进行适当的改进,在不需要任何附加训练和导频信息的条件下,实现了符号定时和频偏的有效估计,与基于循环前缀的估计方法相比,该估计方法扩大了可估计的频率偏差范围,同时降低了运算量.

Efficient timing and frequency offset estimation method for OFDM systems

To achieve the symbol timing and frequency offset estimation of orthogonal frequency division multiplexing(OFDM) systems without any pilot information,a signal structure called reqeat-training-postfix was proposed,and based on the signal structure an efficient timing and frequency offset estimation method was presented.The method improved on the signal form of zero padding OFDM (ZP-OFDM) and achieved efficient timing and frequency offset estimation without any additional training and pilot information.Compared with the method based on cyclic prefix,the presented method extends the frequency offset estimation range and reduces the complexity.