An Implementation of the Decision Feedback Equalizer Based on Delay-Matched Structure

This paper presents a new equalizer structure named Delay-Matched Decision-Feedback Equalizer (DMDFE) which is an effective solution to the hardware implementation of time domain adaptive Decision-Feedback Equalizer (DFE) in single carrier modulated DTV system. The transposed structure combined with the conventional transversal filter is employed in DMDFE to reduce the ghost estimation delay of feedback filter in DFE. And the DMDFE provides a one-symbol period feedback ghost estimation which enables the new structure to have the same performance with ideal Least Mean Square (LMS) DFE. The DMDFE can cope with faster fading channel and longer post-echo than transposed DFE. Meanwhile the DMDFE saves more hardware resources than the transposed DFE.