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A Novel Algorithm of Mitigating Error Propagation in DEF for DTV Receivers
一种减小DTV接收机DFE误差传播的新算法

Keywords: decision feedback equalizer,error propagation,soft decision
判决反馈均衡器
,误差传播,软判决

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Abstract:

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.

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