DIGITAL BROADCAST TRANSMITTER/RECEIVER HAVING AN IMPROVED RECEIVING PERFORMANCE AND SIGNAL PROCESSING METHOD THEREOF

摘要

A digital broadcast transmitting/receiving system, and a signal processing method thereof, includes a randomizer to randomize a transport stream into a specified position of which stuff bytes are inserted, a stuff-byte exchanger to replace the stuff bytes included in the randomized data with specified known data known by a receiver, a Reed-Solomon (RS) encoder to perform an RS-encoding of data output from the stuff-byte exchanger thereby to add a parity to the data, an interleaver to interleave data output from the RS encoder, a trellis encoder to perform a trellis encoding of data output from the interleaver, an RS parity generator to generate a parity for the data changed according to a memory initialization of the trellis encoder, and to output the generated parity to the trellis encoder, and a modulator / RF converter to modulate data output from the trellis encoder and to perform an RF up-converting of the modulated data, wherein the trellis encoder replaces the parity added by the RS encoder with the parity generated by the RS parity generator, and wherein the specified known data has a feature that after the specified known data pass through the trellis encoder, the output specified known data has a spectrum similar to that of pseudo noise and has an average DC (direct current) value close to 0. The digital broadcast receiving performance can be improved even in an inferior multi-path channel by detecting the known data from the received signal and using the known data for synchronization and equalization in a digital broadcast receiver.