Patent ID: 9742604
Date: 2017-08-22
CPC Classifications: H04L

Claim:
1. A broadcast signal receiver comprising: a demodulator configured to OFDM demodulate a received broadcast signal; a frame parser configured to parse a signal frame of the broadcast signal; a demapper & decoder configured to convert PLP data of the broadcast signal to the bit domain and to FEC decode the converted PLP data; and an output processor configured to receive the decoded PLP data and to output a data stream, wherein the signal frame comprises a preamble and at least one subframe, wherein the at least one subframe includes at least one subframe boundary symbol, the subframe boundary symbol being a first symbol or a last symbol of the at least one subframe and the subframe boundary symbol has a greater scattered pilot (SP) density than data symbols of the subframe, and wherein at least one of a last symbol of an immediately preceding subframe or a first symbol of an immediately following subframe is the subframe boundary symbol for neighboring subframes when the signal frame comprises a plurality of subframes and the FFT sizes of the neighboring subframes are different to each other.