Blind SOS subspace channel estimation and equalization techniques exploiting spatial diversity in OFDM systems

Abstract In this paper, we present second-order-statistics (SOS) subspace-based blind channel estimation techniques, which exploit the receive antenna diversity in each of the following situations: cyclic prefix-OFDM (CP-OFDM), zero padded-OFDM (ZP-OFDM), and bandwidth efficient-OFDM (BWE-OFDM) systems. We also propose a number of combinations of pre-FFT equalizer, post-FFT equalizer, zero-forcing (ZF) equalizer, and minimum-mean-square-error (MMSE) equalizer. For any number of receive antennas, the pre-FFT equalizers require only one FFT at the receiver. As a result, a considerable reduction in hardware complexity and power saving may be obtained especially for systems with higher number of sub-carriers. In contrast, post-FFT equalizers result in considerable reduction in processing complexity at the cost of one FFT for each antenna. Adaptive linear-complexity implementations of the proposed receivers are considered, along with some modifications in the presence of null side carriers. The effectiveness of the new techniques is demonstrated through simulations.

[1]  Anna Scaglione,et al.  Redundant filterbank precoders and equalizers. II. Blind channel estimation, synchronization, and direct equalization , 1999, IEEE Trans. Signal Process..

[2]  Yingbo Hua,et al.  Fast subspace tracking and neural network learning by a novel information criterion , 1998, IEEE Trans. Signal Process..

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

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

[5]  Slimane Ben Slimane.  A low complexity antenna diversity receiver for OFDM based systems , 2001, ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).

[6]  S. Roy,et al.  Blind adaptive multiuser detection over ISI channels with channel estimation , 1998, Conference Record of Thirty-Second Asilomar Conference on Signals, Systems and Computers (Cat. No.98CH36284).

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

[8]  B. Floch,et al.  Coded orthogonal frequency division multiplex , 1995 .

[9]  John M. Cioffi,et al.  Estimation of time-varying digital radio channels , 1992 .

[10]  Bin Yang,et al.  Projection approximation subspace tracking , 1995, IEEE Trans. Signal Process..

[11]  Karim Abed-Meraim,et al.  A New Look at the Power Method for Fast Subspace Tracking , 1999, Digit. Signal Process..

[12]  John M. Cioffi,et al.  Discrete multiple tone modulation with coset coding for the spectrally shaped channel , 1992, IEEE Trans. Commun..

[13]  Lang Tong,et al.  Channel equalization for wireless OFDM systems with ICI and ISI , 1999, 1999 IEEE International Conference on Communications (Cat. No. 99CH36311).

[14]  Yu Song,et al.  Blind adaptive reduced-rank detection for DS-CDMA signals in multipath channels , 1999, IEEE J. Sel. Areas Commun..

[15]  Yingbo Hua,et al.  Previously Published Works Uc Riverside Title: Fast Maximum Likelihood for Blind Identification of Multiple Fir Channels Fast Maximum Likelihood for Blind Identification of Multiple Fir Channels , 2022 .

[16]  Fa-Long Luo,et al.  A minor subspace analysis algorithm , 1997, IEEE Trans. Neural Networks.

[17]  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.

[18]  Ender Ayanoglu,et al.  VOFDM broadband wireless transmission and its advantages over single carrier modulation , 2001, ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).

[19]  Chan Kyu Kim,et al.  Adaptive beamforming algorithm for OFDM systems with antenna arrays , 2000, IEEE Trans. Consumer Electron..

[20]  K. Abed-Meraim,et al.  Subspace estimation and tracking using enhanced versions of Oja's algorithm , 2001, 2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471).

[21]  Anna Scaglione,et al.  Redundant filterbank precoders and equalizers. I. Unification and optimal designs , 1999, IEEE Trans. Signal Process..

[22]  Kevin L. Baum,et al.  Adaptive antennas for OFDM , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[23]  John M. Cioffi,et al.  Spatio-temporal coding for wireless communications , 1996, Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference.

[24]  Georgios B. Giannakis,et al.  OFDM with trailing zeros versus OFDM with cyclic prefix: links, comparisons and application to the HiperLAN/2 system , 2000, 2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record.

[25]  Yu Song,et al.  A blind reduced rank CDMA detector for multipath channels , 1999, 1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352).

[26]  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).

[27]  David Hutchison,et al.  The Magic WAND-functional overview , 1998, IEEE J. Sel. Areas Commun..

[28]  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).

[29]  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).

[30]  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).

[31]  Pierre Duhamel,et al.  Subspace-based blind and semi-blind channel estimation for OFDM systems , 2002, IEEE Trans. Signal Process..

[32]  Hui Liu,et al.  Blind carrier synchronization and channel identification for OFDM communications , 1998, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181).

[33]  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.

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

[35]  E. Oja.  Simplified neuron model as a principal component analyzer , 1982, Journal of mathematical biology.

[36]  John M. Cioffi,et al.  Spatial multiuser access OFDM with antenna diversity and power control , 2000, Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152).

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

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

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

[40]  Jae Hong Park,et al.  Performance evaluation of trellis-coded OFDM for digital audio broadcasting , 1999, Proceedings of IEEE. IEEE Region 10 Conference. TENCON 99. 'Multimedia Technology for Asia-Pacific Information Infrastructure' (Cat. No.99CH37030).

[41]  John M. Cioffi,et al.  Spatio-temporal coding for wireless communication , 1998, IEEE Trans. Commun..

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

[43]  Karim Abed-Meraim,et al.  Blind system identification using minimum noise subspace , 1996, Proceedings of 8th Workshop on Statistical Signal and Array Processing.

[44]  Minoru Okada,et al.  A joint frequency and space diversity scheme for OFDM , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[45]  B. R. Saltzberg.  Comparison of single-carrier and multitone digital modulation for ADSL applications , 1998 .

[46]  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).