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http://dx.doi.org/10.7840/KICS.2012.37.6A.450

Non-redundant Precoding Based Blind Channel Estimation Scheme for OFDM Systems  

Seo, Bang-Won (한국전자통신연구원 차세대통신연구부문 이동통신방식연구팀)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37, no.6A, 2012 , pp. 450-457 More about this Journal
Abstract
For orthogonal frequency-division multiplexing (OFDM) systems, we propose a blind channel estimation scheme based on non-redundant precoding. In the proposed scheme, a modified covariance matrix is first obtained by dividing the covariance matrix of the received signal vector by the precoding matrix element-by-element. Then, the channel vector is estimated as an eigenvector corresponding to the largest eigenvalue of the modified covariance matrix. The eigenvector can be obtained by power method with low computational complexity instead of the complicated eigenvalue decomposition. We analytically derive a mean square error (MSE) of the proposed channel estimation scheme and show that the analysis result coincides well with the simulation result. Also, simulation results show that the proposed scheme has better MSE and bit error rate (BER) performance than conventional channel estimation schemes.
Keywords
OFDM; channel estimation; precoding;
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