Reduced rank equalization for precoded OFDM systems

In precoded OFDM systems, zero-forcing (ZF) equalizers suffer from noise enhancement and error spreading problems. A minimum mean square error (MMSE) equalizer can mitigate the problems and improve system performance, however, it has relatively higher complexity and is sensitive to the estimation accuracy of noise variance. In this paper, based on the principle of reduced-rank signal processing, we propose reduced-rank equalizers for precoded OFDM systems. These equalizers can achieve performance close to MMSE equalizers while with complexity similar to ZF equalizers.

[1]  A. Swindlehurst,et al.  Subspace-based signal analysis using singular value decomposition , 1993, Proc. IEEE.

[2]  Xiaohu You,et al.  Subspace-based noise variance and SNR estimation for OFDM systems [mobile radio applications] , 2005, IEEE Wireless Communications and Networking Conference, 2005.

[3]  Cihan Tepedelenlioglu,et al.  Maximum multipath diversity with linear equalization in precoded OFDM systems , 2004, IEEE Transactions on Information Theory.

[4]  Chintha Tellambura,et al.  Power delay profile and noise variance estimation for OFDM , 2006, IEEE Communications Letters.

[5]  Richard J. Vaccaro,et al.  A perturbation theory for the analysis of SVD-based algorithms , 1987, ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[6]  Petre Stoica,et al.  Optimal reduced-rank estimation and filtering , 2001, IEEE Trans. Signal Process..

[7]  J. Scott Goldstein,et al.  Reduced-rank adaptive filtering , 1997, IEEE Trans. Signal Process..

[8]  Louis L. Scharf,et al.  The SVD and reduced rank signal processing , 1991, Signal Process..

[9]  D. Athanasios,et al.  SNR estimation in frequency selective Rayleigh channel for HIPERLAN/2 transceiver , 2005, Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005..

[10]  Wolfgang Utschick,et al.  Pilot-assisted channel estimation based on second-order statistics , 2005, IEEE Transactions on Signal Processing.

[11]  X. You,et al.  Subspace-based noise variance and SNR estimation for MIMO OFDM systems , 2006 .

[12]  David Falconer,et al.  Frequency domain equalization for single-carrier broadband wireless systems , 2002, IEEE Commun. Mag..