Patent ID: 9258164
Filing Date: 2016-02-09
CPC Classification: H04B,H04H,H04L

Claim Text:
1. A method of transmitting a broadcast signal, the method comprising: encoding Physical Layer Pipe (PLP) data with a code rate for forward error correction (FEC), wherein the PLP data carries service data; interleaving the service data; demultiplexing the interleaved service data in accordance with the code rate and a symbol mapping method; mapping the demultiplexed service data into service symbols in accordance with the symbol mapping method; building a signal frame carrying PLP symbols that carries the service symbols, wherein the PLP symbols are data symbols in which a first layer of PLP data and a second layer of PLP data are combined and wherein the first layer of PLP data has a different power level from the second layer of PLP data; modulating the signal frame according to an orthogonal frequency division multiplexing (OFDM) scheme; and transmitting the broadcast signal carrying the signal frame.