Decision-feedback equalization with fixed-lag smoothing in nonlinear channels
Date
2006
Authors
Bartel, D.
White, L.
Editors
Advisors
Journal Title
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Volume Title
Type:
Journal article
Citation
Digital Signal Processing: A Review Journal, 2006; 16(5):577-587
Statement of Responsibility
D.W. Bartel and L.B. White
Conference Name
Abstract
Significant error rates are common in nonlinear communication and digital storage channels, due to nonlinear intersymbol interference (ISI). The decision-feedback equalizer (DFE) is often used to combat ISI, by providing nonlinear feedforward and feedback filters to compensate the nonlinear distortion. This paper presents recent work on a DFE that incorporates fixed-lag smoothing, termed the FLS DFE. We derive the FLSDFE estimator over(X, ̂)<inf>t - n | t</inf> for the case of binary-phase-shift keying inputs to a digital communication channel described by a truncated Volterra series. Simulation results are presented, showing the existence of 'resonance' phenomena within a state-space model of filtering-error propagation. The FLSDFE is shown to experience equalization performance that is strongly channel-dependent, highlighting a potential problem with robustness. © 2005.