Patent ID: 6724844
Filing Date: 2004-04-20
Classification: H04L

Abstract:
A receiver based decision feedback equalizer (DFE)and trellis decoder, comprising:an input which receives an input signal comprising a transmitted symbol stream from a transmission system, noise and multipath intersymbol interference; a DFE output which provides a DFE output signal; a forward filter which filters the input signal; a decision feedback loop comprising a subtractor, a slicer, and a feedback filter, wherein the subtractor is coupled to both an output of the forward filter and an output of the feedback filter and subtracts the output of the feedback filter from the output of the forward filter to provide the DFE output signal which is applied to an input of the slicer; an adaptive filter, having an input coupled to the output of the subcontractor to adaptively filter the DFE output, and whiten an error in the DFE output signal which causes ISI; and a trellis decoder, coupled to the output of the adaptive filter which compensates for the ISI introduced by the adaptive filter.