车载OFDM通信系统中结合后训练序列的判决反馈信道估计方法

发布时间：2018-02-12 16:22

本文关键词： 车载通信后训练序列信道估计正交频分复用(OFDM) 判决反馈　出处：《重庆邮电大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：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)方法和结合平滑滤波的判决反馈信道估计方法相比,所提方法具有更优的误包率性能。
[Abstract]:For the vehicle communication environment with large Doppler spread and delay spread, the channel change information carried by the post-training sequence channel response is used. A decision feedback channel estimation method combined with post-training sequence is proposed. The least square algorithm is used to estimate the channel response of post-training sequence. The channel response estimates of the previous orthogonal frequency division multiplexing OFDM symbols and the post-training sequences are weighted by the coefficients to estimate the channel responses of the current OFDM symbols. The weighted coefficients are obtained automatically by using the channel frequency response relation of its four pilot subcarriers. Finally, the channel response estimation obtained is determined by feedback and low-pass filtering to reduce the noise effect. The simulation results show that, Compared with the current STA(spectral temporal constructing data pilot method and the decision feedback channel estimation method combined with smooth filtering, the proposed method has better packet error rate performance.
【作者单位】：南华大学电气工程学院;
【基金】：国家自然科学基金资助项目(61401193)~~
【分类号】：TN929.53;U495

【相似文献】