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IEICE Transactions on Communications 2008 E91-B(4):1203-1206; doi:10.1093/ietcom/e91-b.4.1203
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Wireless Communication Technologies

Channel Estimation and ICI Cancellation for OFDM Systems in Fast Time-Varying Environments

Likun ZOU1, Qing CHANG1, Chundi XIU1 and Qishan ZHANG1

1 The authors are with the Faculty 202 in School of Electronic and Information Engineering of Beihang University, Beijing, China. E-mail: changq.wjl{at}gmail.com


  Abstract

In order to estimate fast time-varying channels exactly, the Inter-Carrier Interference (ICI) caused by time-varying fading channels in Orthogonal Frequency Division Multiplexing (OFDM) systems is analyzed based on the Basis Expansion Model (BEM). A channel estimation and ICI cancellation algorithm with low complexity is proposed. A special pilot sequence is designed to minimize the cost of computing the channel state information in the proposed algorithm. Based on the property of channel frequency impulse matrix, the ICI can be canceled iteratively in frequency domain. The complexity of the algorithm is analyzed theoretically. Through simulation, the algorithm is shown to be effective in estimating channel state information and in cancelling ICI.

Key Words: OFDM, fast time-varying channel, channel estimation, ICI cancellation

Manuscript received September 25, 2007. Manuscript revised December 4, 2007.


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