Patent ID: 6671314
Filing Date: 2003-12-30
Classification: H04L

Abstract:
A decision feedback equalizer for use in a digital signal receiving system, comprising:an adder for subtracting an estimated echo from an input symbol to generate a demodulated symbol; a Trellis decoder for applying Trellis decoding onto the demodulated symbol to generate a maximum likelihood transmission symbol sequence; a feedback register for storing estimated transmission symbol values for a feedback filter; a coefficient register for storing coefficient values for the feedback filter; a feedback register updating unit for generating an estimated transmission symbol and the estimated transmission symbol value corresponding to a next time point based on the demodulated symbol, the maximum likelihood transmission symbol sequence and the estimated transmission symbol value corresponding to a current time point, and for updating the values stored in the feedback register by using the estimated transmission symbol value corresponding to the next time point; a coefficient updating unit for updating the values stored in the coefficient register based on the demodulated symbol and the estimated transmission symbol; and an estimated echo calculator for calculating the estimated echo based on the values stored in the feedback register and the values stored in the coefficient register.