An apparatus for transmitting a broadcasting signal, the apparatus comprising: an outer coder for outer encoding signaling data; an outer coder for outer encoding service data; an inner coder for inner encoding the outer encoded signaling data by an LDPC coding scheme; an inner coder for inner encoding the outer encoded service data by an LDPC coding scheme;a first interleaver for bit interleaving the inner encoded signaling data; a second interleaver for bit interleaving the inner encoded service data;a demultiplexer for demultiplexing bits in the interleaved signaling data; a demultiplexer for demultiplexing bits in the interleaved service data;a first symbol mapper for constellation-mapping bits of the signaling data into preamble symbols; a second symbol mapper for constellation-mapping the demultiplexed bits in the interleaved service data into service data symbols; a header inserter for inserting a header in front of the service data symbols and building at least one data slice based on the header and the service data symbols; a third interleaver for interleaving data on the preamble symbols; a fourth interleaver for interleaving the at least one data slice; a frame builder for building a signal frame based on the interleaved data on the preamble symbols and the interleaved at least one data slice; a modulator for modulating the signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, method; and a transmitter for transmitting the modulated signal frame, wherein the preamble symbols are divided in frequency direction into Layer 1, L1, blocks of the same bandwidth and the bandwidth of each L1 block corresponding to a total number of active subcarriers assigned to a single channel, the L1 blocks being repeated in the frequency domain with a repetition rate being the bandwidth of the L1 block. an outer coder for outer encoding signaling data; an outer coder for outer encoding service data; an inner coder for inner encoding the outer encoded signaling data by an LDPC coding scheme; an inner coder for inner encoding the outer encoded service data by an LDPC coding scheme;a first interleaver for bit interleaving the inner encoded signaling data; a second interleaver for bit interleaving the inner encoded service data;a demultiplexer for demultiplexing bits in the interleaved signaling data; a demultiplexer for demultiplexing bits in the interleaved service data;a first symbol mapper for constellation-mapping bits of the signaling data into preamble symbols; a second symbol mapper for constellation-mapping the demultiplexed bits in the interleaved service data into service data symbols; a header inserter for inserting a header in front of the service data symbols and building at least one data slice based on the header and the service data symbols; a third interleaver for interleaving data on the preamble symbols; a fourth interleaver for interleaving the at least one data slice; a frame builder for building a signal frame based on the interleaved data on the preamble symbols and the interleaved at least one data slice; a modulator for modulating the signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, method; and a transmitter for transmitting the modulated signal frame, wherein the preamble symbols are divided in frequency direction into Layer 1, L1, blocks of the same bandwidth and the bandwidth of each L1 block corresponding to a total number of active subcarriers assigned to a single channel, the L1 blocks being repeated in the frequency domain with a repetition rate being the bandwidth of the L1 block.