Patent ID: 9692558
Date: 2017-06-27
CPC Classifications: H03M,H04L

Claim:
1. A method for transmitting broadcast signals, the method comprising: encoding service data; parity interleaving a part of the encoded service data, wherein the part of the encoded service data is parity bits of the encoded service data and interleaved by a bit unit, and wherein the parity interleaved service data has a number of bit groups which are based on a length of the encoded service data; group-wise interleaving the number of the bit groups by using a permutation order which is based on the number of the bit groups, wherein the number of the bit groups are interleaved by a unit of the bit groups according to the permutation order; block interleaving the group-wise interleaved bit groups with a set including a number of bit groups which are based on a modulation order, wherein the block interleaving further includes: mapping the block interleaved service data onto a constellation based on a modulation order; building at least one signal frame including the mapped block interleaved service data; modulating data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme; and transmitting the broadcast signals having the modulated data.