Artículo
Near the Cramér-Rao bound precoding algorithms for OFDM blind channel estimation
Autor/es | Simois Tirado, Francisco José
Murillo Fuentes, Juan José Boloix Tortosa, Rafael Salamanca, Luis |
Departamento | Universidad de Sevilla. Departamento de Teoría de la Señal y Comunicaciones |
Fecha de publicación | 2012-02 |
Fecha de depósito | 2024-09-27 |
Publicado en |
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Resumen | The authors present a blind channel estimation of cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) systems with nonredundant precoding based on secondorder statistics. The study analyzes first the mean ... The authors present a blind channel estimation of cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) systems with nonredundant precoding based on secondorder statistics. The study analyzes first the mean square error for the estimation of the covariance matrix of the received symbols. We prove that, for high and medium signal-to-noise ratios (SNRs), the estimation error in the diagonal entries of the covariance matrix exhibits a lower error than that in the off-diagonal elements. This behavior holds for SNR values in digital communication. Contrary to general belief, we prove that the diagonal of this matrix can be used for channel estimation. Hence, we develop a novel algorithm that utilizes this result. We also develop a low-complexity version that provides acceptable results with reduced computational requirements. Finally, we analyze the covariance matrix and propose another new algorithm with noise suppression capabilities. Some experimental results for Rayleigh channels are included to support these conclusions. In addition, they illustrate better performance of the new methods, compared with previous proposals and with the Cramér-Rao bound (CRB). |
Agencias financiadoras | Ministerio de Educación y Ciencia (MEC). España Ministerio de Educación y Ciencia (MEC). España |
Identificador del proyecto | TEC2009-14504-C02-02
2010 CSD2008-00010 |
Cita | Simois Tirado, F.J., Murillo Fuentes, J.J., Boloix Tortosa, R. y Salamanca, L. (2012). Near the Cramér-Rao bound precoding algorithms for OFDM blind channel estimation. IEEE Transactions on Vehicular Technology, 61 (2), 651-661. https://doi.org/10.1109/TVT.2011.2177872. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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Near the Cramer´ −Rao.pdf | 1.307Mb | [PDF] | Ver/ | Versión aceptada |