Fujitsu Corporation

Ryosuke Kobayashi

Shin Watanabe

Tetsuya Yano

Yoshihiro Kawasaki

Yoshiaki Ohta

A radio station includes, a controller configured to configure a bundled channel which is a channel group obtained by bundling a plurality of channels and first information related to the bundled channel, and perform control to generate a transmission opportunity for a second signal that requests an uplink resource for a first signal, according to an amount of data in the bundled channel and the first information, and a communicator configured to transmit the second signal to another radio station according to the transmission opportunity for the second signal, and receives a radio resource from the other radio station.

Radio station and communication system

A radio communication device includes a transmission unit that performs a radio transmission process on a baseband signal in which transmission data is included and that transmits a signal in which the baseband signal is superimposed on a carrier wave; a feedback unit that feeds back the signal transmitted by the transmission unit; a detecting unit that detects a carrier wave component by removing a component corresponding to the baseband signal from a feedback signal that is fed back by the feedback unit; a counting unit that counts the pulses of the carrier wave component detected by the detecting unit; and a calculating unit that calculates a frequency error of the carrier wave by using a count value obtained by the counting unit.

Radio communication device and frequency error measurement method

A distortion compensation unit compensates distortion in the amplifier by using a distortion compensation coefficient that is in accordance with a power value of a signal before amplification in the amplifier. An updating unit updates, on the basis of the signal before amplification in the amplifier and a signal after amplification in the amplifier, the distortion compensation coefficient. An extracting unit extracts, at a predetermined number of measurement periods, when the power value of the signal before amplification in the amplifier is equal to or greater than a threshold, the distortion compensation coefficient that is in accordance with the power value. A first calculating unit calculates, by using an average value of the extracted distortion compensation coefficients, an amount of variation in the distortion compensation coefficient. A determination unit determines, on the basis of the calculated amount of variation in the distortion compensation coefficient, whether the amplifier is degraded.

Growing community of inventors

Kawasaki, Japan

Ryosuke Kobayashi