2×1-D OFDM信道估计算法及其在IEEE 802.16e系统中的应用  

2×1-D OFDM Channel Estimation Algorithm and Its Application to IEEE 802.16e Systems

作　　者：朱琦[1] 陆浩[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电学院学报（自然科学版）》2005年第6期7-11,共5页Journal of Nanjing University of Posts and Telecommunications

基　　金：国家高科技'八六三'计划(2002AA123046);江苏省高校自然科学研究计划(05KJB510090);南京邮电大学'攀登计划'(NY2005013)资助项目

摘　　要：信道估计是实现OFDM(正交频分复用)系统的关键技术,导频辅助的信道估计方法是OFDM系统中应用最为广泛的一类信道估计方法,其中的二维(2-D)维纳滤波是最小均方误差意义下的最佳线性估计器,但是由于其计算量非常大,因而在实际中很难得到很好的应用。两个级联的一维滤波器(2×1-D)与二维滤波器在性能上非常相近,而计算复杂度却大为降低。主要研究了OFDM系统中信道估计方法及其在宽带无线接入(BWA)系统IEEE802.16 e中的应用,实现了802.16 eOFDM环境下2×1-D信道估计算法的仿真,对维纳滤波器的抽头数、导频分布、导频能量及多普勒频移对估计性能的影响进行了分析。Channel estimation is the key technique for OFDM systems. Pilot-assisted channel estimation methods are widely used in OFDM systems. 2-D Wiener filter is the optimal linear estimator in the sense of minimizing MSE, but its complexity prevents its use in practice. The estimation performance of 2×1-D Wiener filter is close to that of 2-D Wiener filter and the computational complexity of 2×1-D Wiener filter is reduced greatly. In this paper, we study the channel estimation methods of OFDM system and its application to IEEE standard 802.16e OFDM systems. The simulation of 2×1-D method under the Vehicular Test A mobile channel proposed in ITU-R M.1225 is realized. We discuss the selection and arrangement of pilots and analyze the effects of tap numbers and Doppler frequency shift on channel estimation performance.

关 键 词：信道估计 正交频分复用 维纳滤波器 

分 类 号：TN911.7[电子电信—通信与信息系统] TN915.04[电子电信—信息与通信工程]