Blind channel estimation for precoded OFDM system

An orthogonal frequency division multiplex (OFDM) system with block-precoding is studied. It is observed that the correlation matrix of the post-DFT data is equal to the direct-product of the channel vector multiplied, element-by-element, by the product of the precoding matrix and its Hermitian. Therefore, an element-by-element division of the post-DFT correlation matrix by the product of the precoding matrix and its Hermitian gives a rank-one matrix whose only singular vector coincides the channel vector up to a phase ambiguity. The design criteria of the precoding matrix are discussed.

[1]  Athina P. Petropulu,et al.  Blind OFDM channel estimation through simple linear precoding , 2004, IEEE Transactions on Wireless Communications.

[2]  Ruifeng Zhang,et al.  Blind OFDM channel estimation through linear precoding: a subspace approach , 2002, Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002..

[3]  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.

[4]  P. Duhamel,et al.  A subspace based blind and semi-blind channel identification method for OFDM systems , 1999, 1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304).

[5]  Umberto Mengali,et al.  A comparison of pilot-aided channel estimation methods for OFDM systems , 2001, IEEE Trans. Signal Process..

[6]  Zhi Ding,et al.  A statistical subspace method for blind channel identification in OFDM communications , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[7]  Georgios B. Giannakis,et al.  Subspace-based (semi-) blind channel estimation for block precoded space-time OFDM , 2002, IEEE Trans. Signal Process..

[8]  Georgios B. Giannakis,et al.  Linearly precoded or coded OFDM against wireless channel fades? , 2001, 2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471).

[9]  Hao Wang,et al.  Data-efficient blind OFDM channel estimation using receiver diversity , 2003, IEEE Trans. Signal Process..

[10]  Georgios B. Giannakis,et al.  Finite-alphabet based channel estimation for OFDM and related multicarrier systems , 2001, IEEE Trans. Commun..

[11]  Robert W. Heath,et al.  Exploiting input cyclostationarity for blind channel identification in OFDM systems , 1999, IEEE Trans. Signal Process..