Abstract
Error propagation phenomena is the major drawback for existing hard-decision feedback turbo equalizers. in this paper, we propose a new soft-decision feedback equalizer (SDFE) suitable for multilevel modulation systems employing turbo equalization. the proposed SDFE offers a low computational complexity growing only linearly with the number of equalizer coefficients, as opposed to the quadratic complexity of MMSE-Based linear turbo equalizer with time-varying coefficients (Exact-MMSE-LE). the performance and convergence property of the proposed SDFE are analyzed using extrinsic information transfer (EXIT) chart and verified by simulations in a severe InterSymbol interference channel set by Proakis. Results show that our approach performs close to Exact-MMSE-LE for BPSK/QPSK modulation. and for 8PSK/16QAM modulations, the proposed SDFE performs much better. It exhibits lower SNR threshold (SNR required for 'waterfall' BER) and much faster convergence than Exact-MMSE-LE. © 1991-2012 IEEE.
Recommended Citation
H. Lou and C. Xiao, "Soft-decision Feedback Turbo Equalization for Multilevel Modulations," IEEE Transactions on Signal Processing, vol. 59, no. 1, pp. 186 - 195, article no. 5594651, Institute of Electrical and Electronics Engineers, Dec 2011.
The definitive version is available at https://doi.org/10.1109/TSP.2010.2083656
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Decision feedback equalizer (DFE); extrinsic information chart (EXIT); minimum mean-square error (MMSE); turbo equalizer
International Standard Serial Number (ISSN)
1053-587X
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Dec 2011
Comments
National Science Foundation, Grant 0915846