Patent ID: 7944964
Filing Date: 2011-05-17
Classification: H04L

Abstract:
1. A decision feedback equalizing apparatus comprising: an equalizing device including a feed forward filter (FFF) that corrects a distorted transmission channel by receiving a match-filtered signal and a feedback filter (FBF) that reduces an inter symbol interference (ISI) of the corrected transmission channel, the equalizing device configured to selectively use the FBF to drive only the FFF in a blind mode and to drive both the FFF and the FBF in a decision directed mode; a diverge/converge determining device that determines whether the decision feedback equalizing apparatus is diverged or converged using a means square error (MSE) obtained through a least means square (LMS) algorithm; and a filter controlling device that controls the equalizing device in the blind mode if the decision feedback equalizing apparatus is determined as divergence, and that controls the equalizing device in the decision directed mode if the decision feedback equalizing apparatus is determined as convergence, wherein the equalizing device includes the feed forward filter that receives a match-filtered signal and filters the received signal to correct a distorted transmission channel using the input match-filtered signal and error values differently inputted according to the blind mode and the decision directed mode; and the feedback filter that receives an output signal of a slicer in the decision directed mode, and that filters the output signal to reduce the ISI of the corrected transmission channel.