Adaptive BLAST decision-feedback equalizer for MIMO-FBMC/OQAM systems

Filter bank-based multicarrier modulation (FBMC) using offset quadrature amplitude modulation (OQAM), known as FBMC/OQAM, provides an attractive alternative to the conventional cyclic prefix-based orthogonal frequency division multiplexing (CP-OFDM), especially in terms of increased robustness to frequency offset and Doppler spread, and high bandwidth efficiency. However, channel equalization in FBMC/OQAM is a nontrivial task, mainly because of the fact that the subchannels are no longer flat, in general. In multiple-antenna (MIMO) time-varying systems, equalizing the channel becomes even more challenging. This paper presents an adaptive T/2-spaced decision-feedback equalization (DFE) algorithm for MIMO-FBMC/OQAM systems, that is both computationally efficient and numerically stable. Its structure follows the V-BLAST idea and the algorithm is applied in a per subcarrier fashion. Simulation results are reported that demonstrate its effectiveness in time-varying MIMO channels with high frequency selectivity.

[1]  Geoffrey Ye Li,et al.  Broadband MIMO-OFDM wireless communications , 2004, Proceedings of the IEEE.

[2]  J. C. Tu.  Optimum MMSE equalization for staggered modulation , 1993, Proceedings of 27th Asilomar Conference on Signals, Systems and Computers.

[3]  Jeffrey G. Andrews,et al.  Fundamentals of WiMAX: Understanding Broadband Wireless Networking (Prentice Hall Communications Engineering and Emerging Technologies Series) , 2007 .

[4]  Ramjee Prasad,et al.  OFDM for Wireless Multimedia Communications , 1999 .

[5]  S. Nedic,et al.  Per-bin DFE for advanced OQAM-based multi-carrier wireless data transmission systems , 2002, 2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599).

[6]  Pierre Siohan,et al.  A new transceiver system for the OFDM/OQAM modulation with Cyclic Prefix , 2008, 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications.

[7]  Takaya Yamazato,et al.  WLC01-6: MIMO Zero-forcing Equalizer for BFDM/OQAM Systems in the Highly Mobile Environments , 2006, IEEE Globecom 2006.

[8]  P. Amini,et al.  A COMPARISON OF ALTERNATIVE FILTERBANK MULTICARRIER METHODS FOR COGNITIVE RADIO SYSTEMS , 2006 .

[9]  John M. Cioffi,et al.  On the relation between V-BLAST and the GDFE , 2001, IEEE Communications Letters.

[10]  Kostas Berberidis,et al.  Cholesky Factorization-Based Adaptive BLAST DFE for Wideband MIMO Channels , 2007, EURASIP J. Adv. Signal Process..

[11]  Jean-Philippe Javaudin,et al.  Pilot-aided channel estimation for OFDM/OQAM , 2003, The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring..

[12]  Reinaldo A. Valenzuela,et al.  Simplified processing for high spectral efficiency wireless communication employing multi-element arrays , 1999, IEEE J. Sel. Areas Commun..

[13]  Kostas Berberidis,et al.  A square-root adaptive V-BLAST algorithm for fast time-varying MIMO channels , 2006, IEEE Signal Processing Letters.

[14]  Maryline Hélard,et al.  Spatial Data Multiplexing Over OFDM/OQAM Modulations , 2007, 2007 IEEE International Conference on Communications.

[15]  Maurice G. Bellanger,et al.  Specification and design of a prototype filter for filter bank based multicarrier transmission , 2001, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221).

[16]  Pierre Siohan,et al.  Analysis and design of OFDM/OQAM systems based on filterbank theory , 2002, IEEE Trans. Signal Process..

[17]  Jeffrey G. Andrews,et al.  Fundamentals of WiMAX: Understanding Broadband Wireless Networking , 2007 .

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

[19]  Lorenzo Vangelista,et al.  Analysis of channel noise in orthogonally multiplexed QAM systems , 1993, Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference.

[20]  Claude Berrou,et al.  Coded orthogonal frequency division multiplex [TV broadcasting] , 1995, Proc. IEEE.

[21]  Jerome Louveaux,et al.  Per subchannel equalization for MIMO FBMC/OQAM systems , 2009, 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing.

[22]  Josef A. Nossek,et al.  Adaptive decision feedback equalization for filter bank based multicarrier systems , 2009, 2009 IEEE International Symposium on Circuits and Systems.

[23]  Giovanni Garbo,et al.  Wireless OFDM-OQAM with a Small Number of Subcarriers , 2008, 2008 IEEE Wireless Communications and Networking Conference.