Subspace based blind channel estimation for OFDM by exploiting virtual carrier

In this paper, a new subspace based blind channel estimation method is proposed for OFDM systems over a time-dispersive channel. The proposed algorithm exploits the presence of virtual carriers and eliminates the cyclic prefix; thereby leading to higher channel utilization than most previously reported cyclic prefix based estimators. A sufficient condition on the channel identifiability is developed. Comparison with two other cyclic prefix based subspace methods is presented via computer simulations to support the effectiveness of the proposed method.

[1]  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).

[2]  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.

[3]  Subhasish Subhasish,et al.  Joint blind estimation of channel and data symbols in OFDM , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

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

[5]  Geoffrey Ye Li,et al.  Robust channel estimation for OFDM systems with rapid dispersive fading channels , 1998, IEEE Trans. Commun..

[6]  Peter Adam Hoeher,et al.  A statistical discrete-time model for the WSSUS multipath channel , 1992 .

[7]  A. M. Abdullah,et al.  Wireless lan medium access control (mac) and physical layer (phy) specifications , 1997 .

[8]  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).

[9]  Luc Vandendorpe,et al.  A Fractionally Spaced Decision Feedback Joint Detection Proposal for Multi Carrier CDMA , 1999, Eur. Trans. Telecommun..

[10]  M. de Courville,et al.  Blind equalization of OFDM systems based on the minimization of a quadratic criterion , 1996, Proceedings of ICC/SUPERCOMM '96 - International Conference on Communications.

[11]  Eric Moulines,et al.  Subspace methods for the blind identification of multichannel FIR filters , 1995, IEEE Trans. Signal Process..

[12]  Hui Liu,et al.  A high efficiency carrier estimator for OFDM communications , 1998, Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136).

[13]  Marc de Courville,et al.  Blind and semi-blind channel identification methods using second order statistics for OFDM systems , 1999, 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258).

[14]  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).

[15]  Per Ola Börjesson,et al.  OFDM channel estimation by singular value decomposition , 1996, Proceedings of Vehicular Technology Conference - VTC.

[16]  Hikmet Sari,et al.  Transmission techniques for digital terrestrial TV broadcasting , 1995, IEEE Commun. Mag..

[17]  Yiyan Wu,et al.  COFDM: an overview , 1995, IEEE Trans. Broadcast..

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

[19]  Luc Vandendorpe,et al.  Equalization for DMT based broadband modems , 2000 .

[20]  J.A.C. Bingham,et al.  Multicarrier modulation for data transmission: an idea whose time has come , 1990, IEEE Communications Magazine.

[21]  Xiaowen Wang,et al.  Adaptive channel estimation using cyclic prefix in multicarrier modulation system , 1999, IEEE Communications Letters.