Radio transmission device and radio reception device
First Claim
1. A radio transmitting apparatus that transmits a layered-modulated OFDM signal, the radio transmitting apparatus comprising:
- a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain;
a second subcarrier modulation section that forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals;
an inverse Fourier transform section that forms an OFDM signal by performing an inverse Fourier transform on the first and second subcarrier modulation signals;
a subcarrier mapping section that is provided ahead of the inverse Fourier transform section and controls allocation of the first and second subcarrier modulation signals to a plurality of subcarriers forming the OFDM signal; and
a section that performs variable control of proportions of the first subcarrier modulation signal and the second subcarrier modulation signal included in the OFDM signal.
2 Assignments
0 Petitions
Accused Products
Abstract
Provided is a radio transmission device (100) which can flexibly cope with a request for assuring an error ratio feature during a high transmission rate, a request for increasing a cell coverage, or the like. The radio transmission device (100) includes a first subcarrier modulation unit (104) which forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals into a frequency region; a second subcarrier modulation unit (105) which forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of signals; an IFFT unit (111) which forms an OFDM signal by performing inverse Fourier transform on the first and the second subcarrier modulation signal; and a subcarrier mapping unit (110) which controls allocation of the first and the second subcarrier modulation signals.
8 Citations
20 Claims
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1. A radio transmitting apparatus that transmits a layered-modulated OFDM signal, the radio transmitting apparatus comprising:
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a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain; a second subcarrier modulation section that forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals; an inverse Fourier transform section that forms an OFDM signal by performing an inverse Fourier transform on the first and second subcarrier modulation signals; a subcarrier mapping section that is provided ahead of the inverse Fourier transform section and controls allocation of the first and second subcarrier modulation signals to a plurality of subcarriers forming the OFDM signal; and a section that performs variable control of proportions of the first subcarrier modulation signal and the second subcarrier modulation signal included in the OFDM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio transmitting apparatus that transmits a layered-modulated OFDM signal, the radio transmitting apparatus comprising:
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a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain; a second subcarrier modulation section that forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals; an inverse Fourier transform section that forms an OFDM signal by performing an inverse Fourier transform on the first and second subcarrier modulation signals; and a subcarrier mapping section that is provided ahead of the inverse Fourier transform section and controls allocation of the first and second subcarrier modulation signals to a plurality of subcarriers forming the OFDM signal, wherein a control signal is modulated using a previously stipulated subcarrier modulation section of the first and second subcarrier modulation sections.
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13. A radio transmitting apparatus that transmits a layered-modulated OFDM signal, the radio transmitting apparatus comprising:
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a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain; a second subcarrier modulation section that forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals; an inverse Fourier transform section that forms an OFDM signal by performing an inverse Fourier transform on the first and second subcarrier modulation signals; a subcarrier mapping section that is provided ahead of the inverse Fourier transform section and controls allocation of the first and second subcarrier modulation signals to a plurality of subcarriers forming the OFDM signal; and a plurality of antennas, wherein the subcarrier mapping section allocates the first and second subcarrier modulation signals to a common subcarrier among antennas.
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14. A radio transmitting apparatus that transmits a layered-modulated OFDM signal, the radio transmitting apparatus comprising:
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a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain; a second subcarrier modulation section that forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals; an inverse Fourier transform section that forms an OFDM signal by performing an inverse Fourier transform on the first and second subcarrier modulation signals; a subcarrier mapping section that is provided ahead of the inverse Fourier transform section and controls allocation of the first and second subcarrier modulation signals to a plurality of subcarriers forming the OFDM signal; an encoder that executes error correction encoding processing on a transmission bit sequence; and a parser section that distributes output of the encoder to the first and second subcarrier modulation sections, wherein the first and second subcarrier modulation sections include a carrier modulation section that modulates a post-error-correction-encoding transmission bit sequence input from the parser section.
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15. A radio transmitting apparatus that transmits a layered-modulated OFDM signal, the radio transmitting apparatus comprising:
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a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain; a second subcarrier modulation section that forms a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals; an inverse Fourier transform section that forms an OFDM signal by performing an inverse Fourier transform on the first and second subcarrier modulation signals; a subcarrier mapping section that is provided ahead of the inverse Fourier transform section and controls allocation of the first and second subcarrier modulation signals to a plurality of subcarriers forming the OFDM signal; an encoder that executes error correction encoding processing on a transmission bit sequence; an interleaver that interleaves output of the encoder; and a parser section that distributes output of the interleaver, wherein the first and second subcarrier modulation sections include a carrier modulation section that modulates a post-error-correction-encoding transmission bit sequence input from the parser section.
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16. A radio transmitting apparatus that transmits a layered-modulated OFDM signal from first and second antennas, the radio transmitting apparatus comprising:
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a first subcarrier modulation section that forms a first subcarrier modulation signal obtained by converting a plurality of modulation signals to a frequency domain; a second subcarrier modulation section that faints a second subcarrier modulation signal obtained by parallel conversion of a plurality of modulation signals; a first inverse Fourier transform section that forms an OFDM signal transmitted from the first antenna by performing an inverse Fourier transform on the first subcarrier modulation signal; a second inverse Fourier transform section that forms an OFDM signal transmitted from the second antenna by performing an inverse Fourier transform on the second subcarrier modulation signal; a first subcarrier mapping section that is provided ahead of the first inverse Fourier transform section and controls allocation of the first subcarrier modulation signal to a plurality of subcarriers forming the OFDM signal; and a second subcarrier mapping section that is provided ahead of the second inverse Fourier transform section and controls allocation of the second subcarrier modulation signal to a plurality of subcarriers forming the OFDM signal. - View Dependent Claims (17, 18, 19, 20)
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Specification