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Optimal channel estimation for MIMO/OFDM systems in time-varying wireless channels

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3 Author(s)
Han Zhang ; Depart. of Electronic Engineering, School of Inform. Science and Tech. Sun-Yat sen University, Guangzhou, China ; Xianhua Dai ; Dong Li

We address the problem of time-varying (TV) channel estimation for MIMO/OFDM systems. Firstly, the TV channel is modeled by truncated discrete Fourier bases (DFB) and covers the approximation frames of multiple OFDM symbols. Then, a two-step approach with analytical performance are adopted where in the first step the TV channel is optimally estimated following an minimum mean square error (MMSE) sense in one OFDM symbol. In the second step of the two-step approach, the channel estimates (derived in 1st step) are further enhance over multiple OFDM symbols by using a novel weighted average approach. Simulation confirms that the proposed approach significantly outperforms the conventional TV channel estimators.

Published in:

Communications, Circuits and Systems, 2008. ICCCAS 2008. International Conference on

Date of Conference:

25-27 May 2008