Patent ID: 7966633

Claim:
A method of transmitting a broadcast signal in a transmitter, the method comprising: encoding mobile data for an additional forward error correction (FEC); forming data groups of the encoded mobile data, each formed data group including the encoded mobile data, signaling information and a plurality of known data sequences, wherein at least two of the known data sequences have different lengths, and wherein placeholders for main data, an MPEG-2 header and non-systematic Reed-Solomon (RS) parity are inserted in each formed data group; forming mobile data packets including data in the formed data groups; multiplexing main data packets including the main data with the formed mobile data packets; performing systematic RS encoding on the main data in the multiplexed data packets and non-systematic RS encoding on the mobile data in the multiplexed data packets; trellis encoding the RS encoded main and mobile data in a trellis encoder, wherein a memory included in the trellis encoder is initialized at a start of each of the plurality of known data sequences; and transmitting data groups including the trellis-encoded data, wherein the data groups are transmitted during slots, the slots being basic time periods for multiplexing of the mobile data and the main data.