A blind linear smoothing method for OFDM systems without cyclic prefix

A linear smoothing based blind channel estimation method for orthogonal frequency-division multiplexing (OFDM) systems over time-dispersive channel is proposed. The proposed method does not require a cyclic prefix and thus leading to higher spectral efficiency. By exploiting the block Toeplitz structure of the channel matrix, the proposed blind estimation method performs satisfactorily with very few received OFDM blocks. Therefore, it is attractive for channel estimation under fast changing channel environment. Computer simulations demonstrate the superior performance of the proposed algorithm over methods reported earlier in the literature.

[1]  Jung-Lang Yu.  Channel estimation for SIMO OFDM systems without cyclic prefix , 2007 .

[2]  Hui Liu.  Signal Processing Applications in CDMA Communications , 2000 .

[3]  Georgios B. Giannakis,et al.  Wireless multicarrier communications , 2000, IEEE Signal Process. Mag..

[4]  Jonathan H. Manton,et al.  A SOS subspace method for blind channel identification and equalization in bandwidth efficient OFDM systems based on receive antenna diversity , 2001, Proceedings of the 11th IEEE Signal Processing Workshop on Statistical Signal Processing (Cat. No.01TH8563).

[5]  Gene H. Golub,et al.  Matrix computations , 1983 .

[6]  Song Wang,et al.  Blind Channel Estimation for Non-CP OFDM Systems Using Multiple Receive Antennas , 2009, IEEE Signal Processing Letters.

[7]  H. Luetkepohl.  The Handbook of Matrices , 1996 .

[8]  Eric Moulines,et al.  Subspace methods for the blind identification of multichannel FIR filters , 1994, Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing.

[9]  Sumit Roy,et al.  A subspace blind channel estimation method for OFDM systems without cyclic prefix , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[10]  Ali N. Akansu,et al.  A subspace method for blind channel identification in OFDM systems , 2000, 2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record.

[12]  Bi Houjie,et al.  Blind channel identification and equalization in OFDM system without cyclic prefix , 2003, International Conference on Communication Technology Proceedings, 2003. ICCT 2003..