Orthogonal frequency division multiplex transmission method
AssigneeFujitsu Limited
InventorTakaharu Nakamura
Life of this patent
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Abstract
A communications system includes a first reception device and a transmission device. The transmission device includes a modulator operable to modulate a plurality of subcarriers using a signal series obtained by multiplexing a first signal series to be transmitted to the first reception device and a second signal series to be transmitted to a plurality of reception devices including the first reception device in a communications area of the transmission device and a transmitter operable to transmit the modulation signals. The first reception device includes a demodulator operable to regenerate the first signal series and the second signal series.
Claims14
A communications system comprising:
- a first reception device;
- and
- a transmission device comprising:
- a modulator operable to modulate a plurality of subcarriers using a signal series obtained by multiplexing a first signal series to be transmitted to the first reception device and a second signal series to be transmitted to a plurality of reception devices including the first reception device in a communications area of the transmission device, and
- a transmitter operable to transmit the modulation signals;
- wherein the first reception device comprises:
- a demodulator operable to regenerate the first signal series and the second signal series.
A transmission device comprising:
- a modulator operable to modulate a plurality of subcarriers using a signal series obtained by multiplexing a first signal series to be transmitted to a first reception device and a second signal series to be transmitted to a plurality of reception devices including the first reception device in a communications area of the transmission device;
- and
- a transmitter operable to transmit the modulation signals.
A reception device comprising:
- a demodulator operable to regenerate a first signal series and a second signal series from a received modulation signal formed by a modulator operable to modulate a plurality of subcarriers using a signal series obtained by multiplexing the first signal series to be transmitted to the reception device and a second signal series to be transmitted to a plurality of reception devices including the reception device.
A transmitted signal comprising:
- a modulation signal formed by a modulator operable to modulate a plurality of subcarriers using a signal series obtained by multiplexing the first signal series to be transmitted to the reception device and a second signal series to be transmitted to a plurality of reception devices including the reception device.
A transmission system comprising:
- a transmitter operable to transmit using an orthogonal frequency division multiplexing;
- and
- a plurality of reception devices operable to receive the signal transmitted by the transmitter;
- wherein
- the transmitter includes a power controller to control transmission power for first signals transmitted to the plurality of reception devices in an area formed by the transmitter to be greater than transmission power for second signals transmitted to a specific device in the area, wherein said first signals and said second signals are time division multiplexed.
A transmission system comprising:
- a transmitter operable to transmit signals using an orthogonal frequency division multiplexing, and
- a plurality of reception devices operable to receive the signals transmitted by the transmitter;
- wherein
- the transmitter includes a power controller to control a power control factor for first signals transmitted to the plurality of reception devices in an area formed by the transmitter to be greater than a power control factor for second signals transmitted to a specific device in the are, wherein said first signal and said second signals are time division multiplexed.
A transmitter transmitting signals using an orthogonal frequency division multiplexing, comprising:
- a power controller to control a transmission power of first signals transmitted to a plurality of reception devices in an area formed by the transmitter to be greater than a transmission power of second signals transmitted to a specific device in the area, wherein said first signal and said second signals are time division multiplexed.
A transmitter transmitting signals using an orthogonal frequency division multiplexing, comprising:
- a power controller to control a power control factor for first signals transmitted to a plurality of reception devices in an area formed by the transmitter to be greater than a power control factor for second signals transmitted to a specific device in the area, wherein said first signals and said second signals are time division multiplexed.
A transmitter transmitting signals to a plurality of reception devices using an orthogonal frequency division multiplexing, comprising:
- a transmission unit operable to utilize sub-carriers not only for transmission of data to be received by the plurality of reception devices in an area formed by the transmitter but also for transmission of data to be received by a specific reception device by sharing the sub-carriers in a time divisional manner.
Dependencies are inferred from the claim text.