Joint channel estimation and ISI/ICI cancellation for MIMO OFDM systems

Authors:
Yi-Jen Chiu;Chien-Sheng Chen;Ting-Wei Chang
Affiliations:
Department of Digital Entertainment and Game Design, Taiwan Shoufu University, Tainan, Taiwan.;Department of Information Management, Tainan University of Technology, Tainan, Taiwan.;VIA Technologies Inc., Taipei, Taiwan
Venue:
International Journal of Ad Hoc and Ubiquitous Computing
Year:
2011

Citing 2
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ICI and ISI analysis and mitigation for OFDM systems with insufficient cyclic prefix in time-varying channels

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Abstract

In MIMO OFDM systems, the multipath components whose delays exceed Cyclic Prefix cause Inter-Symbol Interference and Inter-Carrier Interference, which may degrade system performance severely. In this paper, we propose a joint channel estimation and ISI/ICI cancellation scheme in which a limited CP is used in a trade-off against high-rate performance in MIMO OFDM systems. A channel estimation scheme based on the criterion of Expectation-Maximisation (EM) algorithm can be proposed through the use of a training symbol. Simulation results show that the proposed method can significantly enhance the overall MIMO OFDM system performance after only a few iterations.