Patent ID: 9456234
Filing Date: 2016-09-27
CPC Classification: H04N

Claim Text:
1. A method of transmitting service data proceeding with input data to output transmission unit data; encoding the transmission unit data; interleaving the encoded transmission unit data; mapping the interleaved transmission unit data; building a signal frame including the mapped transmission unit data; modulating the signal frame by OFDM (Orthogonal Frequency Division Multiplex) scheme; inserting a preamble at a start of the signal frame in a time domain, and transmitting a broadcast signal carrying the modulated signal frame and the preamble, wherein the preamble includes a first preamble symbol and a second preamble symbol, and a sequence of the first preamble symbol are different from a sequence of the second preamble symbol in a time domain, wherein the first preamble symbol includes a suffix in the time domain which is obtained from a part of the first preamble symbol based on a frequency shifting method, and wherein the second preamble symbol includes a prefix in the time domain which is obtained from a part of the second preamble symbol based on a frequency shifting method.