A Novel Algorithm of Mitigating Error Propagation in DEF for DTV Receivers[J]. Journal of Image and Graphics, 2006, 11(11): 1600. DOI: 10.11834/jig.2006011273.
A Novel Algorithm of Mitigating Error Propagation in DEF for DTV Receivers
Decision feedback equalizer(DFE) is an efficient scheme for suppressing intersymbol interference(ISI) in vestigial sideband(VSB) based digital TV(DTV) receivers.However
it suffers from error propagation(EP).This paper considers the use of soft decisions in mitigating EP in a DFE.An optimized soft decision algorithm using the hyperbolic tangent function in the decision device is proposed to improve performance over reducing EP.Furthermore
in order to speed up the EP simulation process
a simple but effective modification is made in the feedback tap weight updating process.Computer simulation results show that the proposed soft decision algorithm nearly meets the EP performance of ideal DFE
which is far better in performance compared to the erasure algorithm.