Pre-equalization Method to Minimize Time Delay of Equalization Digital On-Channel Repeater in ATSC System

This paper presents a novel pre-equalization method to minimize the signal processing time delay of the equalization digital on-channel repeater (EDOCR) for the ATSC terrestrial digital TV system. The proposed pre-equalization method is to calculate pre-equalizer filter coefficients by using a baseband signal as a reference signal and a demodulated repeater output signal, then to create new VSB pulse shaping filter coefficients by the convolution of the equi-ripple (ER) filter and the pre-equalizer filter coefficients. The new VSB pulse shaping filter minimizes the time delay of the EDOCR by adjusting the number of its pre-taps and also compensates the linear distortions due to the use of the ER filter and mask filter.