Patent ID: 8565336
Filing Date: 2013-10-22
Classification: H04L

Abstract:
1. A data transmission apparatus for inserting additional data upon data modulation, the data transmission apparatus comprising: a first data modulating unit comprising a first symbol mapping unit configured to symbol-map first input data, wherein the first data modulating unit is configured to generate first modulated data by digital-modulating the first input data in accordance with a multi-carrier modulation scheme; a second symbol mapping unit configured to generate second mapping data by symbol-mapping second input data inserted after the input of the first input data; a second data modulating unit configured to combine the first modulated data with the second mapping data and generate second modulated data by digital-modulating the combined data again in accordance with a predefined modulation scheme; and a data transmitting unit configured to transmit the second modulated data to the exterior, wherein, when the second data modulating unit combines the first modulated data with the second mapping data, the second data modulating unit inserts phase information of symbols related to the second mapping data to a DC component of a signal containing the first modulated data.