基于反转相移导频的OFDM系统信道估计  

A novel channel estimation method for OFDM system by using inverse phase-shifted pilot sequences

作　　者：刘汉奎[1] 郝希准[1] 王云秀[1] 

机构地区：[1]西华师范大学物理与电子信息学院,南充637009

出　　处：《四川大学学报（自然科学版）》2012年第5期1049-1052,共4页Journal of Sichuan University(Natural Science Edition)

基　　金：四川省教育厅重点项目(11ZA038)

摘　　要：针对两发一收的OFDM系统,引入具有反转相移特性的导频序列,提出了一种新颖的基于离散余弦变换的信道估计方法.该方法有效地降低了不同发送天线上的导频信号之间的相互干扰,大大提高了信道估计精度.利用COST207TU信道模型进行仿真,结果表明,与传统梳状导频和相移导频方法相比,在同样的信噪比下,该方法得到的均方误差更小.A novel DCT-based channel estimation method is proposed for the OFDM system with two transmitter antennas and one receiver antenna, in which some inverse phase-shifted pilot sequences are introduced. It weakens efficiently the interference between the different transmitter antennas＇ pilot sequences, and enhances the estimation accuracy. A simulation is performed by using the model of COST207TU. The simulation results show that the proposed method performs better than the traditional comb-type pilot method and the normal phase-shifted pilot method, since the obtained mean square error by the proposed method is lowest under same signal-to-noise ratio.

关 键 词：正交频分复用 信道估计 反转相移导频 离散余弦变换 

分 类 号：TN929.52[电子电信—通信与信息系统]