OFDM channel estimation by singular value decomposition

O. Edfors, M. Sandell, J.-J. van de Beek, S.K. Wilson, P.O. Borjesson
1998 IEEE Transactions on Communications  
In this paper we present and analyze low-rank channel estimators for orthogonal frequency-division multiplexing (OFDM) systems using the frequency correlation of the channel. Low-rank approximations based on the discrete Fourier transform (DFT) have been proposed, but these suffer from poor performance when the channel is not sample spaced. We apply the theory of optimal rank-reduction to linear minimum mean-squared error (LMMSE) estimators and show that these estimators, when using a fixed
more » ... n using a fixed design, are robust to changes in channel correlation and signal-to-noise ratio (SNR). The performance is presented in terms of uncoded symbol-error rate (SER) for a system using 16-quadrature amplitude modulation (QAM).
doi:10.1109/26.701321 fatcat:qp3asgh5ojhtzfcg6snlo4prna