Title :
Blind Channel Estimation for Improper OFDM Systems with Linear Precoding
Author :
Seo, Bangwon ; Chung, Hyun Kyu
Author_Institution :
Mobile Telecommun. Res. Div., Electron. & Telecommun. Res. Inst., Daejeon
Abstract :
In this paper, we propose a non-redundant preceding-assisted blind channel estimation scheme for the improper orthogonal frequency-division multiplexing (OFDM) systems. In the proposed scheme, a modified cross-correlation matrix of the augmented received signal is obtained by dividing the cross- correlation matrix of the even-indexed and odd-indexed OFDM received signal by the precoding matrix element-wise. The channel coefficient vector is estimated as a principal eigenvector of the modified cross-correlation matrix, and it is obtained by the computationally simple power method without the need of the complicate eigenvalue decomposition. Simulation results show that the channel estimation and bit error rate (BER) performance of the proposed scheme is superior to that of the conventional preceding-assisted blind channel estimation scheme.
Keywords :
OFDM modulation; channel estimation; correlation theory; eigenvalues and eigenfunctions; error statistics; linear codes; matrix algebra; precoding; bit error rate; blind channel estimation; channel coefficient vector; cross-correlation matrix; linear precoding; orthogonal frequency-division multiplexing systems; precoding matrix; principal eigenvector; Bit error rate; Blind equalizers; Computational modeling; DSL; Digital video broadcasting; Eigenvalues and eigenfunctions; Frequency division multiplexing; Matrix decomposition; OFDM; Radio transmitters;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.472