一种基于ZCZ序列的OFDM信道估计

Implicit OFDM channel estimation using ZCZ sequences

提出了一种基于ZCZ序列的OFDM信道估计方法,该方法是基于隐训练序列的信道估计方法的一个特例。与传统的基于训练序列的估计方法不同,隐训练序列不占用单独的时隙,而是周期性地叠加在数据序列上,这虽然引起了一定的发送能量损耗,但大大提高了信息速率。该估计方法利用了接收数据的一阶统计特性,具有实现简单的优点,与传统的基于训练序列的方法相比,提高了频谱利用率。由于ZCZ序列的平衡性,该方法不受直流偏移的影响,这大大改善了传统的基于隐训练序列的信道估计性能。给出了信道估计算法,并对估计误差进行了分析。

A new channel estimation based on ZCZ sequences is presented,which is a special of implicit training based channel estimation.Different from conventional training schemes,implicit training sequences occupy no time slopes.Implicit training sequences are added to information periodically,which brings some sending energy loss,but increases information race greatly.This estimation method exploits the first order statistics in the received data,is easy to realize,and increases the efficiency of spectrum when compared with conventional training schemes.Due to its property of balance,this scheme improves the performance of traditional implicit training based channel estimation on the aspect of dc offset.The channel estimation mathematics based on ZCZ sequences is given,and the estimation error is analyzed.