Patent ID: 8149940

Claim:
A digital broadcasting transmitter comprising: a packet formatter for generating enhanced data packets including enhanced data and a known data sequence; a Reed-Solomon (RS) encoder for RS-coding the enhanced data packets by adding first parity data; a data interleaver for interleaving data of the RS-coded enhanced data packets; a trellis encoding unit for trellis-encoding the interleaved data, wherein memories included in the trellis encoding unit are initialized by initialization data at a start of the known data sequence; a backward-compatibility processor for generating second parity data based on the initialization data and providing the second parity data to the trellis encoding unit; and a first multiplexer for multiplexing the trellis-encoded data with field and segment synchronization signals, wherein the trellis encoding unit comprises: a trellis encoder having at least one memory and trellis-encoding one input bit among symbols corresponding to the interleaved data at a coding rate of ½; and a pre-coder having at least one memory and pre-coding the other input bit among the symbols.