Patent ID: 9246635
Filing Date: 2016-01-26
CPC Classification: H03M,H04L

Claim Text:
1. A method for transmitting broadcast signals, the method comprising: encoding service data; mapping the encoded service data into symbols to build at least one signal frame; frequency interleaving data in the at least one signal frame by using different interleaving sequences, wherein the frequency interleaving includes: generating an interleaving address for one of the interleaving sequences based on a main-sequence and a symbol offset; modulating the frequency interleaved data by an OFDM (Orthogonal Frequency Division Multiplex) scheme; and transmitting the broadcast signals having the modulated data, wherein the interleaving sequences are variable based on FFT sizes of the OFDM scheme, wherein when an FFT size is 32K, the main-sequence is defined based on a 14 bits binary sequence and the symbol offset is defined as a 15 bits binary sequence, wherein when an FFT size is 8K, the main-sequence is defined based on a 12 bits binary sequence and the symbol offset is defined as a 13 bits binary sequence, wherein when an FFT size is 16K, the main-sequence is defined based on a 13 bits binary sequence and the symbol offset is defined as a 14 bits binary sequence.