Patent ID: 9559811
Date: 2017-01-31
CPC Classifications: H03M,H04B,H04L

Claim:
1. A method of transmitting broadcast signals, the method including: encoding, by an encoder, PLP (Physical Layer Pipe) data; time interleaving, by a time interleaver, the encoded PLP data; mapping, by a framing block, the time interleaved PLP data onto at least one signal frames; frequency interleaving, by a frequency interleaver, data in the at least one signal frames, wherein a toggling bit is generated based on a modulo operation, wherein an interleaving sequence for the frequency interleaving is generated based on a symbol offset sequence and the toggling bit, wherein the symbol offset sequence is calculated based on an FFT (Fast Fourier Transform) size, and wherein the symbol offset sequence is generated for every OFDM symbol pair which comprised of two consecutive OFDM symbols, wherein after the interleaving sequence is generated based on the symbol offset sequence and the toggling bit, it is checked whether or not an address of the interleaving sequence is within a range of an OFDM symbol; and modulating, by a waveform generator, the frequency interleaved data in the at least one signal frame and transmitting broadcast signals having the modulated data.