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IEICE Transactions on Communications 2008 E91-B(4):1076-1083; doi:10.1093/ietcom/e91-b.4.1076
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Wireless Communication Technologies

A Low-Complexity Bock Linear Smoothing Channel Estimation for SIMO-OFDM Systems without Cyclic Prefix

Jung-Lang YU1 and Chia-Hao CHEN1

1 The authors are with the Department of Electrical Engineering, Fu Jen Catholic University, Taipei, Taiwan 242. E-mail: yujl{at}ee.fju.edu.tw


  Abstract

Orthogonal frequency-division multiplexing (OFDM) systems often use a cyclic prefix (CP) to simplify the equalization design at the cost of bandwidth efficiency. To increase the bandwidth efficiency, we study the blind equalization with linear smoothing [1] for single-input multiple-output (SIMO) OFDM systems without CP insertion in this paper. Due to the block Toeplitz structure of channel matrix, the block matrix scheme is applied to the linear smoothing channel estimation, which equivalently increases the number of sample vectors and thus reduces the perturbation of sample autocorrelation matrix. Compared with the linear smoothing and subspace methods, the proposed block linear smoothing requires the lowest computational complexity. Computer simulations show that the block linear smoothing yields a channel estimation error smaller than that from linear smoothing, and close to that of the subspace method. Evaluating by the minimum mean-square error (MMSE) equalizer, the block linear smoothing and subspace methods have nearly the same bit-error-rates (BERs).

Key Words: OFDM, cyclic prefix, SIMO, linear smoothing, MMSE equalizer

Manuscript received June 4, 2007. Manuscript revised October 4, 2007.


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