Patent ID: 7555080
Filing Date: 2009-06-30
Classification: H04L

Abstract:
1. A digital broadcasting receiving system comprising: a demodulator for receiving and demodulating a RF (Radio Frequency) television signal into a digital television (DTV) base band signal through A/D (Analog-to-Digital) conversion and carrier and timing restoration; an equalizer for compensating channel distortion included in the digital base band signal, through a coefficient updating depending on a fed-back error value; a MLSE unit for estimating a transmission signal by using a MLSE (Maximum Likelihood Sequence Estimation) method using a correlation of past symbols of an output of the equalizer, and outputting an estimated MLSE decision signal; and an error generating unit for generating an error value from a difference between an equalized signal of the equalizer and the estimated MLSE decision signal of the MLSE unit, to feedback the error value to the equalizer, wherein the error generating unit comprises: a first error calculator for obtaining the difference between the equalized signal and the MLSE decision signal fed-back, to generate a first error signal; a second error calculator for comparing whether or not the equalized signal is more than zero and obtaining a difference between a first constant selected depending on a compared result and the equalized signal, to generate a second error signal; a third error calculator for outputting the first error signal as a third error signal if the first and second error signals have the same signs as each other, and outputting zero as the third error signal if the first and second error signals have different signs from each other; a fourth error calculator for squaring the equalized signal and multiplying the equalized signal by a difference between a squared value and a second constant, to generate a fourth error signal; and a final error calculator for combining the first to fourth error signals to generate a final error signal.