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

Authors: Yi-Jen Chiu, Chien-Sheng Chen, Ting-Wei Chang

Addresses: 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

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.

Keywords: ISI; inter-symbol interference; ICI; inter-carrier interference; expectation maximisation; channel estimation; ISI-ICI cancellation; MIMO–OFDM systems; simulation; orthogonal frequency division multiplexing; OFDM; high-speed data transmission; mobile communications.

DOI: 10.1504/IJAHUC.2011.038999

International Journal of Ad Hoc and Ubiquitous Computing, 2011 Vol.7 No.2, pp.137 - 142

Published online: 11 Mar 2011 *

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