MIMO OFDM系统时变信道估计及最优导频分布

应用科学学报 ›› 2006, Vol. 24 ›› Issue (6): 565-568.

MIMO OFDM系统时变信道估计及最优导频分布

胡蝶, 杨绿溪

东南大学信息科学与工程学院, 江苏南京 210096

收稿日期:2005-06-27 修回日期:2005-10-12 出版日期:2006-11-30 发布日期:2006-11-30
作者简介:胡蝶,博士生,研究方向:OFDM系统中的信道估计、跟踪和导频序列的设计,E-mail:hudie@seu.edu.cn;杨绿溪,教授,博导,研究方向:数字信号/图像处理、盲信号处理、神经智能信息处理以及移动通信中的空时信号处理,E-mail:lxyang@seu.edu.cn
基金资助:
国家自然科学基金(60496310);国家自然科学基金(60272046);江苏省自然科学基金(BK2005061)资助项目

Time-Varying Channel Estimation and Pilot Tone Placement for MIMO OFDM Systems

HU Die, YANG LÜ-xi

School of Information Science and Engineering, Southeast University, Nanjing 210096, China

Received:2005-06-27 Revised:2005-10-12 Online:2006-11-30 Published:2006-11-30

摘要/Abstract

摘要： 基于分段线性模型,提出了一种利用导频序列的信道估计算法.该算法首先利用导频序列估计出当前OFDM符号间隔内信道线性变化的斜率和中间时刻信道的冲激响应值,然后根据线性模型利用估计出的参数得到当前符号间隔内所有时刻上的信道冲激响应.此外,还研究了所提算法中的导频分布问题.可以证明,在快时变环境下,分组且每组等间隔分布于频域上的导频序列有着更好的系统性能.仿真结果表明了所提算法在时变环境下的有效性和采用等间隔分组导频序列的优越性.

关键词: 多输入多输出正交频分复用, 分段线性模型, 导频序列, 时变信道估计

Abstract: Time-varying channel estimation for MIMO OFDM systems is challenging.Based on piecewise linear model, this paper proposes an estimation method that first estimates the slope of linear variant and the channel impulse response at the middle time of the current OFDM symbol using pilot sequences, and then estimates the whole channel impulse response through the estimated parameters.Along with the estimation scheme, pilot tone placement is studied.It is better to group pilot tones together into clumps that are equispaced in the frequency domain.Simulation results show effectiveness of the proposed scheme and demonstrate superiority of using the equispaced-grouped pilot sequences.

Key words: pilot sequences, time-varying channel estimation, piecewise linear model, MIMO OFDM

中图分类号:

TN911.23

胡蝶, 杨绿溪. MIMO OFDM系统时变信道估计及最优导频分布[J]. 应用科学学报, 2006, 24(6): 565-568.

HU Die, YANG LÜ-xi. Time-Varying Channel Estimation and Pilot Tone Placement for MIMO OFDM Systems[J]. Journal of Applied Sciences, 2006, 24(6): 565-568.