Patent ID: 7859596

Claim:
A method of processing broadcast data in a broadcast transmitter, the method comprising: performing, by a Reed Solomon (RS) encoder, RS encoding and Cyclic Redundancy Check (CRC) encoding on mobile service data, thereby packaging the mobile service data into an RS frame; mapping, by a group formatter, the RS frame into a plurality of groups, wherein each of the plurality of groups includes a portion of the mobile service data in the RS frame, a first known data sequence, a plurality of second known data sequences, and a transmission parameter, wherein the first known data sequence has a first pattern and the plurality of second known data sequences have a second pattern other than the first pattern, wherein the transmission parameter is positioned between the first known data sequence and one of the plurality of second known data sequences, and wherein the first known data sequence and the one of the plurality of second known data sequences differ from each other in length; and modulating, by a modulator, a broadcast signal including the plurality of groups.