Patent ID: 9712357
Date: 2017-07-18
CPC Classifications: H03M,H04H,H04L,H04N

Claim:
1. A method of transmitting a broadcast signal, the method comprising: LDPC (Low Density Parity Check) encoding data of at least one of Physical Layer Pipes (PLPs) according to a code rate; bit interleaving the LDPC encoded data; mapping the bit interleaved data into a constellation, wherein the constellation includes a Non-Uniform Constellation (NUC), and wherein a real component and an imaginary component for the mapping are independently divided and separately mapped into at least two sub-constellations and the at least two sub-constellations form the NUC in which constellation points are non-uniformly spread; building at least one signal frame by mapping the mapped data of PLPs; modulating data of the built at least one signal frame by OFDM (Orthogonal Frequency Division Multiplexing); and transmitting the modulated data of the at least one signal frame.