Conditional ML and MAP techniques for error propagation suppression in multi-path DFE detectors

Abstract

Simple and effective Error Propagation (EP) suppression techniques were reported earlier for decision feedback equalization (DFE) detectors. However, these techniques are not well suited for multi-path DFE detectors because EP suppression and path selection mechanisms interfere with each other. In this paper, we propose novel techniques for improving the EP performance of multi-path DFE schemes, in particular, the (1 7) coded M3DFE (advanced multi-level DFE). The effectiveness of the proposed techniques is quantified by evaluating the sector failure rate (SFR) improvement. Simulation and calculation results show that after applying the proposed EP suppression techniques, M3DFE achieves almost the same SFR as that caused by random errors.Index Terms-Decision feedback equalization, multi-level DFE, error propagation suppression, multi-path detectors.

Techniques for minimizing error propagation in decision feedback detectors for recording channels

“…First, let us examine TT-1. The false-detection probability for TT-1 is given by for (11) For the sake of simplicity, we neglect the term for in (11) since the typical BER is of the order of or less. Thus, we get…”

“…Third, reliability of the resulting 0018-9464/01$10.00 © 2001 IEEE decisions is assessed by evaluating an appropriate energy function. Very recently, Lin et al [11] reported a threshold-based method for minimizing EP in M3DFE, an advanced version of MDFE.…”