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Performance of a hybrid decision feedback equalizer structure for CAP-based DSL systems

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2 Author(s)
Gi-Hong Im ; Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea ; Kyu-Min Kang

We study the performance of a class of derision feedback equalizer (DFE) structures for high-speed digital transmission systems. We first present mathematical formulation of minimum mean-square error (MMSE) and the optimum tap coefficients for various finite-length phase-splitting equalizers over the loop in the presence of colored noise, such as near-end crosstalk (NEXT) and far-end crosstalk (FEXT). The performance of the equalizers is also analyzed in the presence of narrowband interference and the channel reflections introduced by bridged taps. The hybrid-type DFE (H-DFE) is presented as a practical equalizer structure for these applications. The results of analysis show that the H-DFE has advantages in the performance and/or in the implementation complexity as compared with the existing DFE structures. An additional advantage of the H-DFE is in the transmission systems that employ the precoding technique. The precoding for the H-DFE allows the system to track small changes in the channel

Published in:

IEEE Transactions on Signal Processing  (Volume:49 ,  Issue: 8 )