文献类型：期刊文献

中文题名：一种新的基于导频簇的OFDM系统信道估计

英文题名：OFDM Channel Estimation Based on Novel Grouped Pilot Tones

作者：夏灵明[1];袁伟娜[1];朱煜[1]

机构：[1]华东理工大学信息科学与工程学院,上海200237

年份：2014

卷号：36

期号：10

起止页码：48

中文期刊名：铁道学报

外文期刊名：Journal of the China Railway Society

收录：CSTPCD;;EI(收录号：20144600199998);Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：中央高校基本科研业务费专项资金

语种：中文

中文关键词：正交频分复用;多普勒频移;导频;时变信道;OFDM

外文关键词：Doppler frequency shift;pilot;time-varying channel

摘要：本文对快速移动环境下的正交频分复用系统信道估计及导频设计进行了研究。基于时变信道的线性分段模型假设,通过研究分析得出,频域信道矩阵在大子载波数下可近似为带状矩阵,且对角线元素的左右两边可近似为相反数,基于此特点提出一种新的导频簇图案,以消除子载波间干扰。理论分析和仿真实验表明,本文提出的导频图案能够在大子载波数和高多普勒频移的环境下,获取比传统方案更好的性能。
Channel estimation and pilot design for OFDM systems were investigated . On the assumption that channel time-variations could be approximated with a piece-wise linear model ,when the number of subcarriers was large , the frequency-domain channel matrix could be approximated to a banded matrix and the elements of the left-diagonal of channel matrix were approximately the negatives of the corresponding elements of the right-diagonals . Making use of this characteristic , the novel grouped pilot tones were proposed to cancellintercarri-er-interference .Both the analytical and simulation results demonstrate that the proposed pilot tones can obtain preferable performance to conventional pilot tones at high Doppler frequencies and with large numbers of sub-carriers .