基于混合结构导频和FFT低通滤波的OFDM信道估计  

Study on channel estimation based on hybrid type pilot and FFT lowpass filtering for OFDM

作　　者：刘解华[1] 杨东凯[1] 常青[1] 张其善[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083

出　　处：《电路与系统学报》2009年第1期38-41,共4页Journal of Circuits and Systems

基　　金：航空科学基金资助项目(04F51068);北京市科技新星计划(2005B13)

摘　　要：精确的估计精度、良好的跟踪能力,以及实现简单是信道估计的三个基本要求。本文提出一种混合结构导频的信道估计新方法,采用块状导频和基于FFT低通滤波的LS算法捕捉准确的信道频域响应,利用少数梳状导频和改进的LS算法跟踪信道变化和修正相位噪声。通过仿真证明,该方法估计精度高,频谱利用高,信道跟踪能力强,实现简单,满足了慢衰落信道环境下的应用要求。High estimation precision, good tracking performance and easy realization are essential to channel estimation. A novel channel estimation method based on hybrid type pilot is proposed. According to this method, block type pilots and a LS algorithm based on FFT lowpass filtering are adopted to capture accurate channel response in frequency domain; and a few of comb-type pilots and an improved LS algorithm are adopted to track channel change and correct phase noise. Simulation results show that this proposed method meet the demand of slow fading environment communication, due to high estimation precision and bandwidth efficieney, good tracking performance and easy realization.

关 键 词：正交频分复用 混合结构导频 FFT低通滤波 信道估计 

分 类 号：TN914.15[电子电信—通信与信息系统]