Patent ID: 9628221
Date: 2017-04-18
CPC Classifications: H04B,H04H,H04L

Claim:
1. A method for transmitting broadcast signals, the method comprising: encoding data in each of a plurality of Physical Layer Pipes (PLPs) with Forward Error Correction (FEC); building a frame including the encoded data; Orthogonal Frequency Division Multiplexing (OFDM) modulating data in the built frame; and inserting a first symbol and at least one second symbol into the built frame; and transmitting the broadcast signals including the modulated data, the first symbol and the at least one second symbol, wherein the first symbol includes a first portion, an effective portion and a second portion, wherein one of the first portion and the second portion is generated by frequency shifting a part of the effective portion of the first symbol and the at least one second symbol includes a third portion, an effective portion and a fourth portion, wherein one of the third portion and the fourth portion is generated by frequency shifting a part of the effective portion of the at least one second symbol, wherein the built frame comprises one or more subframes, wherein the built frame further includes signaling information indicating whether each subframe of the one or more subframes is Multi-Input Multi-Output (MIMO) encoded or not.