LTE-V2X标准下基于导频的信道估计方法

A Pilot Based Channel Estimation Method Under LTE-V2X Standard

车车通信的信道环境与传统无线蜂窝网传输环境相比,收发天线的高度较矮,并且多普勒频移较高,使得智能交通系统的通信性能面临巨大的挑战。为此提出了基于导频的信道估计算法,采用LTE-V标准中导频分布的改进方案以抵抗信道环境中较高的多普勒频移,用低阶LMMSE估计方法实现导频处的信道估计,然后对其进行DFT运算以提高导频处的估计精度,最后对导频位置的信道估计结果进行插值运算,实现对V2V信道的准确估计,其误码率性能在城市通信场景下取得了较好的性能表现。基于LTE-V标准搭建了车车Matlab仿真系统,与性能表现较好的STA和CDP方法相比,该方法的通信性能表现较好。

In this paper,a pilot based channel estimation algorithm is proposed.An improved pilot distribution scheme in LTE-V standard is adopted to resist the higher Doppler shift in V2V channel environment.Firstly,the channel estimation at the pilot is realized by the low-order LMMSE estimation method.Secondly,the DFT estimation is carried out to improve the estimation accuracy.Finally,the channel estimation result of the pilot position is interpolated in this paper.