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Improved H-infinity channel estimator based on EM for MIMO-OFDM systems
Alternative TitleImproved H-infinity channel estimator based on EM for MIMO-OFDM systems
Xu Peng1; Wang Jinkuan1; Qi Feng2
2011
Source PublicationJOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS
ISSN1004-4132
Volume22Issue:4Pages:572-578
AbstractH-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.
Other AbstractH-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.
KeywordLINEAR-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
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Bureau of Education of Hebei Province] ; [Funds of Central Colleges Basic Scientific Operating Expense]
CSCD IDCSCD:4308893
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/142731
Collection中国科学院金属研究所
Affiliation1.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
Recommended Citation
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.
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