Ntt Corporation

Yosuke Fujino

Daisuke Goto

Kiyohiko Itokawa

Yasuyoshi Kojima

Kazumitsu Sakamoto

Tomoya Kageyama

A signal acquisition unit acquires a reception signal received by a reception device from a transmission device that moves relative to the reception device. A compensation unit compensates for a Doppler shift of the reception signal on the basis of a possibility of a change amount of the Doppler shift. A search unit changes a value of a possibility of the change amount of the Doppler shift in a case where a bandwidth having a power equal to or greater than a predetermined threshold in frequency components of the reception signal after the compensation is larger than a predetermined value.

Doppler shift compensation apparatus and doppler shift compensation method

There is provided a control device of a wireless communication system including the control device that is installed on a moving object and moves, a first communication device that transmits a desired signal to the control device by a first wireless method, a second communication device that transmits an interference signal interfering with the desired signal by a second wireless method, and one or more third communication devices, the control device including: a reception unit that acquires a wireless signal including a reference signal transmitted from the third communication device in the vicinity of the second communication device by a third wireless method and a desired signal transmitted from the first communication device by the first wireless method; an extraction unit that extracts the reference signal from the wireless signal based on the third wireless method; an estimation unit that estimates a propagation channel between the third communication device and the control device based on the reference signal; and a beam control unit that directs a null of a reception beam in an arrival direction of the reference signal based on the propagation channel.

Control apparatus and control method

A signal acquisition unit acquires a reception signal received by a reception device from a transmission device that moves relative to the reception device. A bandwidth specifying unit specifies a reception bandwidth that is a bandwidth of the reception signal. A shift specifying unit specifies a change amount of a Doppler shift per time on the basis of a difference between a bandwidth of a transmission signal in the transmission device and the reception bandwidth. A compensation unit compensates for a change of the Doppler shift of the reception signal on the basis of the change amount specified.

A communication device includes an antenna, a support portion, an actuator, a floating body, a sensor, and a control device. The antenna has a rod-shaped element. The instruction unit supports the antenna rotatably about a rotation axis orthogonal to an extending direction of the element. The actuator rotates the antenna about the rotation axis. The floating body supports the support portion and floats on water. The sensor measures a physical quantity related to inclination of the support portion. The control device includes a measurement value acquisition unit and a rotation control unit. The measurement value acquisition unit acquires a measurement value of the sensor. The rotation control unit drives the actuator on the basis of the measurement value to match a direction in which a change in the inclination is smallest with an extending direction of the antenna.

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Musashino, Japan

Yosuke Fujino