Communication device and communication method
OwnerWataru Matsumotoinventor
Life of this patent
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Abstract
A transmitter section converts a transmission symbol to a half symbol and conducts communication in such a state that a predetermined power difference is given between even-numbered subcarriers and odd-numbered subcarriers. A receiver section conducts Fourier transform on a received symbol, demodulates data assigned to the subcarriers, on the other hand, conducts inverse Fourier transform on the demodulated data, generates a first symbol corresponding to even-numbered subcarriers, removes the first symbol component from the received symbol, generates a second symbol corresponding to odd-numbered subcarriers, conducts Fourier transform on the second symbol, and demodulates data assigned to the subcarriers.
Claims11
A communication apparatus which adopts a multicarrier modulation and demodulation technique, said communication apparatus comprising:
- a transmitter unit which converts a transmission symbol to a half symbol and conducts communication in such a state that a predetermined power difference is given between even-numbered subcarriers and odd-numbered subcarriers which is interference components at time of demodulation, and
- a receiver unit which conducts predetermined Fourier transform to extract even-numbered subcarriers on a received symbol converted to the half symbol, and demodulates data assigned to the subcarriers,
- which, on the other hand, conducts inverse Fourier transform on the data assigned to the even-numbered subcarriers, and generates a first symbol formed of temporal waveforms of the even-numbered subcarriers,
- which subsequently removes the first symbol component from the received symbol, generates a second symbol formed of temporal waveforms of odd-numbered subcarriers, and generates a third symbol by adding a symbol obtained by copying and inverting the second symbol, after the second symbol, and
- which finally conducts predetermined Fourier transform to extract odd-numbered subcarriers on the third symbol, and demodulates data assigned to the subcarriers.
A communication apparatus functioning as a transmitter which adopts a multicarrier modulation and demodulation technique, said communication apparatus comprising:
- a transmitter unit which converts a transmission symbol to a half symbol and conducts communication in such a state that a predetermined power difference is given between even-numbered subcarriers and odd-numbered subcarriers which is interference components at time of demodulation.
A communication apparatus functioning as a receiver which adopts a multicarrier modulation and demodulation technique, said communication apparatus comprising:
- a first demodulation unit which conducts predetermined Fourier transform to extract even-numbered subcarriers on a received symbol converted to the half symbol, and demodulates data assigned to the subcarriers,
- a first symbol generation unit which conducts inverse Fourier transform on the data assigned to the even-numbered subcarriers, and generates a first symbol formed of temporal waveforms of the even-numbered subcarriers,
- a second symbol generation unit which removes the first symbol component from the received symbol, and generates a second symbol formed of temporal waveforms of odd-numbered subcarriers,
- a third symbol generation unit which generates a third symbol by adding a symbol obtained by copying and inverting the second symbol, after the second symbol, and
- a second demodulation unit which conducts predetermined Fourier transform to extract odd-numbered subcarriers on the third symbol, and demodulates data assigned to the subcarriers.
A communication method which adopts a multicarrier modulation and demodulation technique, the communication method comprising:
- a transmission step which converts a transmission symbol to a half symbol and conducts communication in such a state that a predetermined power difference is given between even-numbered subcarriers and odd-numbered subcarriers which is interference components at time of demodulation,
- a first demodulation step which conducts predetermined Fourier transform to extract even-numbered subcarriers on a received symbol converted to the half symbol, and demodulates data assigned to the subcarriers,
- a first symbol generation step which conducts inverse Fourier transform on the data assigned to the even-numbered subcarriers, and generates a first symbol formed of temporal waveforms of the even-numbered subcarriers,
- a second symbol generation step which removes the first symbol component from the received symbol, and generates
- a second symbol formed of temporal waveforms of odd-numbered subcarriers,
- a third symbol generation step which generates a third symbol by adding a symbol obtained by copying and inverting the second symbol, after the second symbol, and
- a second demodulation unit which conducts predetermined Fourier transform to extract odd-numbered subcarriers on the third symbol, and demodulates data assigned to the subcarriers.
Dependencies are inferred from the claim text.