Patent ID: 7738581

Claim:
A digital broadcasting system comprising: a digital broadcasting transmitter encoding a data stream including stuff bytes at a certain location, modulating, RC-converting and transmitting the encoded data stream having known data; and a digital broadcasting receiver receiving the encoded data stream, demodulating the encoded data stream into a baseband signal, and equalizing the demodulated signal using the detected known data, the digital broadcasting transmitter including: a randomizer receiving and randomizing the data stream including stuff bytes at the certain location, a sequence provider generating the known data having a particular sequence to replace the stuff bytes, a stuff byte replacer inserting the known data at the location of the randomized data stream where the stuff bytes are inserted, an encoder encoding the data stream output from the stuff byte replacer for error-correction, and a transmission part modulating, RF-converting and transmitting the encoded data stream, the encoder including: an RS encoder adding a parity of certain bytes to correct errors generated by channels, an interleaver interleaving the data added with the parity in a certain pattern, and a trellis encoder trellis-encoding the interleaved data, wherein the encoder replaces the parity added by the RS encoder with newly generated parity for the know data altered according to an initialization of the trellis encoder.