Fujitsu Corporation

Hisato Kawano

Satoshi Matsubara

Yasuhito Funyu

Hiroaki Abe

Hideyuki Kannari

Shigeru Sekine

Masaki Kira

Takashi Tabu

Yusuke Tobisu

Akihiko Komatsuzaki

Masayuki Watabe

Kohei Ohta

A wireless communication device that implements beamforming includes: a storage, a processor, and a radio circuit. The storage stores directivity information that indicates a directivity of a radio intensity obtained when beams are formed in a plurality of main lobe directions designated in advance. The processor calculates, based on the directivity information, an interference to a first beam from a second beam when an instruction to form the first beam and the second beam is given. The first beam is configured to transmit a first signal in a first main lobe direction. The second beam is configured to transmit a second signal in a second main lobe direction. The processor generates, based on the calculated interference, a cancellation signal for canceling the second signal in the first main lobe direction. The radio circuit transmits the first signal and the cancellation signal.

Wireless communication device that implements beamforming

In a network employing code division multiplex access, a distortion compensation amplifying apparatus is provided which is capable of making quick response to carry out the distortion compensation with high accuracy even if the signal power to be inputted thereto varies rapidly. In this distortion compensation amplifying apparatus, the renewal of a distortion compensation coefficient in a renewing unit is complemented on the basis of a result of amplification in an amplifier with respect to a signal code-division-multiplexed in a pseudo-signal multiplexing unit.

Distortion compensation amplifying apparatus and base station

In the present invention, input data are extracted by a clock and compared with the previous input data. A cyclic counter is provided for cyclically counting clock signals in each noise erasure time period (the maximum retaining time of a signal referred to as noise). When a change is detected in input data, the counter value is stored. When the input data indicate no changes, the counter value and the stored counter value are compared. If a non-coincident result is outputted, it indicates that the noise erasure time has not passed since the input data indicated a change. Therefore, the input data are not outputted. If a coincident result is outputted, it indicates that the cyclic counter counted one cycle. That is, the noise erasure time has passed. Therefore, the input data are outputted since the input data are not recognized as noise.

Circuit for providing digital data having high clarity in a digital

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Kawasaki, Japan

Hisato Kawano