Patent ID: 7668264
Filing Date: 2010-02-23
Classification: H03M,H04L,H04N

Abstract:
1. A decision feedback equalizer in a terrestrial digital broadcasting receiver, comprising: a channel estimating unit for estimating a channel of a symbol-based receiving signal based on the receiving signal and a training sequence; a channel-matched filtering unit for changing a channel property of the receiving signal by maximizing a signal-to-noise ratio (SNR) of the estimated channel; an input signal storing unit for storing a receiving symbol of which channel property is changed by the channel-matched filtering unit; a channel equalizing unit for performing a decision feedback equalization by-repeatedly filtering the receiving signal which passed through the channel-matched filtering unit; a trellis decoding unit for detecting a symbol, which is decision data, based on trellis decoding algorithm with decreased complexity, whose trace back depth is 1, from channel equalized receiving symbols, and outputting the symbol in a decision directed mode; a statistical data calculating unit for calculating statistical error data used in a blind mode and outputting the statistical error data; a training sequence storing unit for storing the training sequence; a switching unit for selecting a mode among a training mode, the decision directed mode and the blind mode; an error signal calculating unit coupled downstream of the switching unit for calculating an error signal by comparing an output signal in the mode selected by the switching unit to an output signal of the channel equalizing unit; and a tap coefficient updating unit comprising