[1]吕博,张兴周,刘春玲.基于EM的MIMO-OFDM系统LMMSE信道估计[J].应用科技,2011,38(02):38-41.[doi:10.3969/j.issn.1009-671X.2011.02.09]
 LV Bo,ZHANG Xingzhou,LIU Chunling.EM-based LMMSE channel estimation for MIMOOFDM system[J].Applied science and technology,2011,38(02):38-41.[doi:10.3969/j.issn.1009-671X.2011.02.09]
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基于EM的MIMO-OFDM系统LMMSE信道估计(/HTML)
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《应用科技》[ISSN:1009-671X/CN:23-1191/U]

卷:
第38卷
期数:
2011年02期
页码:
38-41
栏目:
现代电子技术
出版日期:
2011-02-05

文章信息/Info

Title:
EM-based LMMSE channel estimation for MIMOOFDM system
文章编号:
1009-671X (2011) 02-038-05
作者:
吕博 张兴周刘春玲
哈尔滨工程大学 信息与通信工程学院, 黑龙江 哈尔滨 150001
Author(s):
LV BoZHANG XingzhouLIU Chunling
(College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China)
关键词:
多输入多输出正交频分复用信道估计期望最大化线性最小均方误差
Keywords:
multiple input multiple output(MIMO) orthogonal frequency division multiplexing(OFDM) channel estimation expectation maximum(EM) linear minimum mean square error(LMMSE)
分类号:
TN919
DOI:
10.3969/j.issn.1009-671X.2011.02.09
文献标志码:
A
摘要:
最小均方误差( MMSE)信道估计算法应用于MIMOOFDM系统时将带来高计算复杂度且不易实现,根据这个问题,提出了一种基于期望最大化(EM)的线性最小均方误差(LMMSE)信道估计算法,并分析了该算法的性能.EM算法可以把多输入多输出(MIMO)信道估计问题转化为一系列单输入单输出(SISO)信道估计问题,避免了大规模的矩阵运算,简化了算法,提高了系统性能和估计精度,为进一步改善基于EM的LMMSE信道估计算法的性能,通过设计训练序列对EM迭代初值的计算方法进行了,改进,通过实验仿真表明改进后的方法提高了系统的性能.
Abstract:
The channel estimation algorithm of minimum mean square error(MMSE)is of high computational complexity and is not easy to carry out when it is applied to multiple input multiple output with orthogonal frequency division multiplexing(MIMOOFDM)systems. Aiming at these problems, an expectation maximum(EM)based linear minimum square mean(LMMSE )algorithm is proposed and the performance is analyzed. The EM algorithm can change multiple input multiple output(MIMO)channel estimation problem into a series of single input single output(SISO)channel estimation. This transformation can avoid largescale matrix operation so as to simplify the algorithm and improve the performance of the system and the accuracy of the estimation. In order to enhance the performance of the EMbased LMMSE channel estimation, the initial value of the iterative EM algorithm is improved through designing the training sequences. The improved performance of the system is verified by several simulation experiments.

参考文献/References:

[1] FOSCHINI G J, GANS M J. On limits of wireless communications in a fading environment when using multiple antennas[J]. IEEE Trans on Wireless Communication, 1998, 6(3): 311-335.
[2] BARHUMI I, LEUS G, MOONEN M. Optimal training design for MIMO OFDM systems in mobile wireless channels[J]. IEEE Trans on Signal Processing,2003,51(6): 1615-1624.
 [3] FRENKEL L, FEDER M. Recursive expectationmaximization (EM) algorithms for timevarying parameters with applications to multiple target tracking[J]. IEEE Trans Signal Processing,1999,2(47): 306-320.
[4] GAO J, LIU H. Lowcomplexity map channel estimation for mobile MIMOOFDM systems[J]. IEEE Trans on Wireless Communication,2008,7(3): 774-780.
[5] ALRAWI G A, ALNAFFOURI T Y, BAHAI A. Exploiting errorcontrol coding and cyclic prefix in channel estimation for coded OFDM systems[J]. IEEE Commun Lett,2003,7(7): 388-390.
[6] XIE Y , GEORGHIADES C N. EMtype channel estimation algorithms for OFDM with transmitter diversity[J]. IEEE Trans on Wireless Communication, 2008, 7(3): 774-780.
[7] ZAMIRIJAFARIAN H, PASUPATHY S. EMbased recursive estimation of channel parameters[J]. IEEE Communication,1999,47(9): 1297-1302.
[8] LI Y. Simplified. channel estimation for OFDM systems with multiple transmit antennas[J]. IEEE Trans on Wireless Communication,2002,1(1): 67-75.
[9] LU B, WANG X, LI Y G. Iterative receivers for spacetime blockcoded OFDM systems in dispersive fading channels[J]. IEEE Trans on Wireless Communication,2002,1(2): 213-225.

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备注/Memo

备注/Memo:
作者简介:吕博(1986-), 女,硕士研究生,主要研究方向:现代通信系统与通信技术,E-mail:513141288@qq.com.
更新日期/Last Update: 2011-04-12