Improved H-infinity channel estimator based on EM for MIMO-OFDM systems

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	Improved H-infinity channel estimator based on EM for MIMO-OFDM systems
其他题名	Improved H-infinity channel estimator based on EM for MIMO-OFDM systems
	Xu Peng 1; Wang Jinkuan 1; Qi Feng 2
	2011
发表期刊	JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS
ISSN	1004-4132
卷号	22 期号:4 页码:572-578
摘要	H-infinity estimator is generally implemented in time-variant state-space models, but it leads to high complexity when the model is used for multiple input multiple output with orthogonal frequency division multiplexing (MIMO-OFDM) systems. Thus, an H-infinity estimator over time-invariant system models is proposed, which modifies the Krein space accordingly. In order to avoid the large matrix inversion and multiplication required in each OFDM symbol from different transmit antennas, expectation maximization (EM) is developed to reduce the high computational load. Joint estimation over multiple OFDM symbols is used to resist the high pilot overhead generated by the increasing number of transmit antennas. Finally, the performance of the proposed estimator is enhanced via an angle-domain process. Through performance analysis and simulation experiments, it is indicated that the proposed algorithm has a better mean square error (MSE) and bit error rate (BER) performance than the optimal least square (LS) estimator. Joint estimation over multiple OFDM symbols can not only reduce the pilot overhead but also promote the channel performance. What is more, an obvious improvement can be obtained by using the angle-domain filter.
其他摘要	H-infinity estimator is generally implemented in timevariant state-space models,but it leads to high complexity when the model is used for multiple input multiple output with orthogonal frequency division multiplexing (MIMO-OFDM)systems.Thus,an H-infinity estimator over time-invariant system models is proposed,which modifies the Krein space accordingly.In order to avoid the large matrix inversion and multiplication required in each OFDM symbol from different transmit antennas,expectation maximization (EM)is developed to reduce the high computational load.Joint estimation over multiple OFDM symbols is used to resist the high pilot overhead generated by the increasing number of transmit antennas.Finally,the performance of the proposed estimator is enhanced via an angle-domain process.Through performance analysis and simulation experiments,it is indicated that the proposed algorithm has a better mean square error (MSE)and bit error rate (BER)performance than the optimal least square (LS)estimator.Joint estimation over multiple OFDM symbols can not only reduce the pilot overhead but also promote the channel performance.What is more,an obvious improvement can be obtained by using the angle-domain filter.
关键词	LINEAR-ESTIMATION WIRELESS SYSTEMS KREIN SPACES DESIGN multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) channel estimation H-infinity expectation maximization (EM) angle domain
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [Bureau of Education of Hebei Province] ; [Funds of Central Colleges Basic Scientific Operating Expense]
CSCD记录号	CSCD:4308893
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/142734
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Katholieke University Leuven, Elect Engn Dept ESAT Telecommun Microwaves TELEMI, B-3001 Heverlee, Belgium
推荐引用方式 GB/T 7714	Xu Peng,Wang Jinkuan,Qi Feng. Improved H-infinity channel estimator based on EM for MIMO-OFDM systems[J]. JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS,2011,22(4):572-578.
APA	Xu Peng,Wang Jinkuan,&Qi Feng.(2011).Improved H-infinity channel estimator based on EM for MIMO-OFDM systems.JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS,22(4),572-578.
MLA	Xu Peng,et al."Improved H-infinity channel estimator based on EM for MIMO-OFDM systems".JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS 22.4(2011):572-578.