Data transmission apparatus and method, and data reconstitution apparatus and method
First Claim
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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.
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Abstract
Disclosed are data transmission/reception apparatus and method that may be applied to a case where additional data is to be transmitted in a CE-OFDM modulation/demodulation scheme that satisfies an OFDM feature which is robust against multipath fading and simultaneously has a feature that amplitude is constant. Service channel information, modulation parameter information of a physical layer, and the like, may be transmitted by using an additionally secured information channel. If using this, a service search time may be saved, and power of a receiver may be reduced.
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Citations
17 Claims
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1. A data transmission apparatus for inserting additional data upon data modulation, the data transmission apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A data transmission method for inserting additional data upon data modulation, the data transmission method comprising:
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a first data modulating step comprising a first symbol mapping step for symbol-mapping first input data, wherein the first data modulating step generates first modulated data by digital-modulating the first input data in accordance with a multi-carrier modulation scheme; a second symbol mapping step for generating second mapping data by symbol-mapping second input data inserted after the input of the first input data a second data modulating step for combining the first modulated data with the second mapping data and generating second modulated data by digital-modulating the combined data again in accordance with a predefined modulation scheme; and a data transmitting step for transmitting the second modulated data to the exterior, wherein, when the first modulated data is combined with the second mapping data in the second data modulating step, phase information of symbols related to the second mapping data is inserted into a DC component of a signal containing the first modulated data. - View Dependent Claims (7)
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8. A data reconstitution apparatus, comprising:
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a demodulating unit configured to extract second data from combined data in which first data was combined with the second data to form the second data and the first data from which the second data is extracted, perform digital-demodulation on the extracted second data in accordance with a predefined first demodulation scheme, and perform digital-demodulation on the first data from which the second data is extracted, in accordance with a predefined second demodulation scheme; a second data reconstituting unit configured to reconstitute the second data by symbol-demapping the digital-demodulated second data; and a first data reconstituting unit configured to reconstitute the first data by digital-demodulation of the digital-demodulated first data again in accordance with a multi-carrier demodulation scheme, wherein the data demodulating unit performs the first demodulation scheme, based on phase information of symbols inserted into a DC component of a signal containing the combined data. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A data reconstitution method, comprising:
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a data demodulating step for extracting second data from combined data in which first data was combined with the second data to form the second data and the first data from which the second data is extracted, digital-demodulating the extracted second data in accordance with a predefined first demodulation scheme, and digital-demodulating the first data from which the second data is extracted, in accordance with a predefined second demodulation scheme; a second data reconstituting step for reconstituting the second data by symbol-demapping the digital-demodulated second data; and a first data reconstituting step for reconstituting the first data by digital-demodulating the digital-demodulated first data again in accordance with a multi-carrier demodulation scheme, wherein the data demodulating step performs the first demodulation scheme, based on phase information of symbols inserted into a DC component of a signal containing the combined data. - View Dependent Claims (15, 16, 17)
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Specification