Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

An apparatus for transmitting broadcast signals, the apparatus comprising:

• an input formatter that formats input packets into Physical Layer Pipe (PLP) data,
• wherein a sync byte of each input packet is deleted, and
• wherein the input formatter further comprises:
• a header compressor that deletes packet headers of successive input packets except for a packet header of a first input packet in the successive input packets, wherein the successive input packets have sequentially increasing continuity counter fields and the other header fields of the successive input packets are the same;
• an encoder that encodes the PLP data;
• an interleaver that interleaves the encoded PLP data;
• a frame builder that builds at least one signal frame including the interleaved PLP data;
• a modulator that modulates data in the at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method;
• and
• a transmitter that transmits the broadcast signals having the modulated data.

An apparatus for receiving broadcast signals, the apparatus comprising:

• a tuner that receives the broadcast signals having at least one signal frame;
• a demodulator that demodulates data in the at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) scheme;
• a deinterleaver that deinterleaves Physical Layer Pipe (PLP) data in the demodulated data;
• a decoder that decodes the deinterleaved PLP data;
• and
• a decapsulation processor that decapsulates data packets carried in the decoded PLP data, the data packets including a first data packet having a packet header and a packet payload and second data packets having packet payloads only, wherein the decapsulation processor further comprises:
• a header decompressor that restores the second packets by inserting packet headers to the second data packets based on the first data packet, wherein the first data packet and the restored second data packets have sequentially increasing continuity counter fields and the other header fields are the same, and
• wherein the decapsulation processor further inserts a sync byte to each data packet.

A method of receiving broadcast signals, the method comprising:

• receiving the broadcast signals having at least one signal frame;
• demodulating data in the at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) scheme;
• deinterleaving Physical Layer Pipe (PLP) data in the demodulated data;
• decoding the deinterleaved PLP data;
• and
• decapsulating data packets carried in the decoded PLP data, the data packets including a first data packet having a packet header and a packet payload and second data packets having packet payloads only, wherein the decapsulating data packets further comprises:
• restoring the second packets by inserting packet headers to the second data packets based on the first data packet, wherein the first data packet and the restored second data packets have sequentially increasing continuity counter fields and the other header fields are the same;
• and
• inserting a sync byte to each data packet.