期刊论文

A decision-directed channel estimation method with postamble in vehicular OFDM communication system

中文

重庆邮电大学学报(自然科学版)

1673-825X

2017

29

1

1-8

10.3979/j.issn.1673-825X.2017.01.001

国家自然科学基金资助项目（61401193）~~；

本校为第一机构

针对具有较大多普勒扩展和时延扩展的车载通信环境,利用后训练序列信道响应携带的信道变化信息,提出一种结合后训练序列的判决反馈信道估计方法。该方法采用最小二乘算法估计后训练序列的信道响应;对前一个正交频分复用(orthogonal frequency division multiplexing, OFDM)符号和后训练序列的信道响应估计值进行系数加权求和来估计当前OFDM符号的信道响应,并利用其4个导频子载波的信道频率响应关系自动获取加权系数;最后,对获得的信道响应估计值进行判决反馈和低通滤波以降低噪声影响。仿真结果表明,与目前取得较好性能的STA(spectral temporal averaging)方法、CDP(constructing data pilot)方...

This paper proposes a decision-directed channel estimation method based on the information of channel variation carried by the channel response of postamble, catering for vehicular communication environment with both large Doppler spread and large delay spread. We firstly estimate the channel response of postamble by the least squares algorithm. Then, we estimate channel response of the current orthogonal frequency division multiplexing(OFDM) symbol by coefficient weighted summation for the estimated channel response value of the previous OFDM symbol and the postamble, and utilize the channel ...