摘要
针对高速移动正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统,文中提出了一种基于位置信息的广义复指数基扩展模型(Generalized Complex Exponential Basis Expansion Model,GCE-BEM)时变信道估计方法。首先采用GCE-BEM方法对信道进行建模,将对信道的估计转换成对基系数的估计,一方面降低了计算复杂度,另一方面降低了载波间干扰,提高了信道估计精度;其次根据信道的稀疏性,利用列车的位置信息确定主要基系数,通过对主要基系数进行估计获取OFDM符号上所有载波的信道信息,进一步降低了相邻子信道的干扰与计算复杂度,提高了信道估计精度。理论分析与仿真结果表明,本文方法可以显著地提高信道估计精度,且具有低的计算复杂度。
Location information based GCE-BEM timevarying channel estimation method is proposed for the orthogonal frequency division multiplexing(OFDM)system in the high speed mobile scenario.In the proposed method,the GCE-BEM method is firstly used to model the time-varying channel for convering the channel estimation into the estimation of the base coefficient.By using the GCE-BEM in the proposed method,the computational complexity is reduced,and the estimation accuracy is improved by reducing the inter-carrier interference.According to the sparsity of the channel,the main base coefficient is then determined by using the position information of the train,and the channel information of all carriers on one OFDM symbol is obtained by estimating the main basis coefficients,thus reducing the interference and the computational complexity,and improving the estimation accuracy.Theoretical analysis and simulation results show that the method can improve the channel estimation accuracy and has low computational complexity.
作者
程露
杨丽花
王增浩
梁彦
CHENG Lu;YANG Lihua;WANG Zenghao;LIANG Yan(Jiangsu Key Laboratory of Wireless Communication,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
出处
《南京邮电大学学报（自然科学版）》
北大核心
2020年第1期29-34,共6页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
江苏省高等学校自然科学研究项目(18KJ13510034)
中国博士后科学基金(2018T110530)
国家自然科学基金(61401232,61671251,61771255)资助项目。
关键词
高速移动
正交频分复用
时变信道估计
GCE-BEM
位置信息
high-speed mobility
orthogonal frequency division multiplexing(OFDM)
time-varying channel estimation
generalized complex exponential basis expansion model(GCE-BEM)
location information
