Patent ID: 9584261
Date: 2017-02-28
CPC Classifications: H04B,H04H,H04L

Claim:
1. A method for transmitting broadcast signals, the method comprising: encoding service data by an encoder; mapping the encoded service data onto constellations by a mapper; time interleaving the mapped service data by a time interleaver; mapping the time interleaved service data into at least one signal frame by a frame builder; frequency interleaving data in the at least one signal frame by using an interleaving sequence which is generated for an OFDM (Orthogonal Frequency Division Multiplex) symbol pair comprised of two sequential OFDM symbols by a frequency interleaver, wherein the interleaving sequence is generated based on a main sequence, a symbol offset, and a modulo operation, and wherein an address check operation is applied to the generated interleaving sequence; modulating the frequency interleaved data by the OFDM scheme by a modulator; and transmitting the broadcast signals having the modulated data by a transmitter.