Abstract: A transmission data controller determines a frequency bandwidth according to a relay apparatus position, the frequency bandwidth being used for a first signal transmitted from a first communication apparatus, on the basis of information regarding the number of first communication apparatuses with which a relay apparatus communicates at the relay apparatus position. The transmission data controller transmits band information indicating a frequency band selected from radio frequency bands that can be used for the first signal on the basis of the determined frequency bandwidth to the first communication apparatus. The first communication apparatus transmits the first signal having a frequency included in the frequency band indicated by the band information. The relay apparatus acquires waveform data of the first signal transmitted by the first communication apparatus, and transmits the acquired waveform data to a second communication apparatus by a second signal.

Abstract: An optical signal emitting direction control method of a present embodiment includes arranging a transparent member to extend over an underwater space and an in-air space, causing an optical signal to enter the transparent member from the underwater space via a surface of an underwater portion of the transparent member immersed in the underwater space, and causing the optical signal entered the transparent member to be emitted into the in-air space via a surface of an in-air portion of the transparent member exposed to the in-air space.

Abstract: A wireless communication device includes: a transmission unit that transmits a signal to another wireless communication device mounted on a moving object; a timing control unit that starts transmission of the signal by the transmission unit at a timing at which communication with the other wireless communication device is possible; a distance calculation unit that acquires orbit information indicating a geocentric orbit of the moving object and self-position information indicating a self-position to calculate a positional relationship between the self-position and a position of the moving object at the timing based on the orbit information and the self-position information; and an output control unit that controls a transmission output of the signal by the transmission unit according to the positional relationship.

Abstract: Provided is a wireless communication system including a plurality of terminal devices, a relay device mounted on a mobile object, and at least one base station device, in which the terminal device includes a terminal device transmission unit that transmits a signal including transmission data to the relay device, and the relay device includes: a relay device reception unit that receives the signal transmitted from the terminal device; a plurality of queues that stores the transmission data included in the signal; a sorting unit that sorts and records the transmission data included in the signal into any one of the plurality of queues on the basis of a preamble pattern included in the signal or a reception timing of the signal; and a relay device transmission unit that transmits signals indicating the transmission data recorded in the plurality of queues to the base station device at a timing at which communication with the base station device is possible, while prioritizing transmission data recorded in a pre

Abstract: A receiving unit receives a signal from a transmission terminal. A capacity specifying unit specifies a channel capacity related to wireless communication with a base station. A data generation unit generates waveform data representing the received signal. A data size of the waveform data increases as the channel capacity increases. A transmission unit transmits the waveform data to the base station.

Abstract: A moving relay apparatus includes a first signal receiver, a second signal transmitter, and a transmission data controller. The first signal receiver receives a wireless first signal transmitted by the first communication apparatus by a reception antenna, and acquires waveform data of the first signal received by the reception antenna. A second signal transmitter transmits the waveform data acquired by the first signal receiver to the second communication apparatus by a second signal. A transmission data controller controls a data amount of the waveform data generated by the first signal receiver on the basis of information regarding communication quality between the relay apparatus and the first communication apparatus at a relay apparatus position where the first signal has been received.

Abstract: A wireless communication system includes a plurality of communication apparatuses and a relay apparatus which is mobile, in which the relay apparatus includes a classification unit that groups the plurality of communication apparatuses by using position information of each of the plurality of communication apparatuses, a set determination unit that determines a set of communication apparatuses belonging to different groups that transmit and receive data within the same period, a transmission timing control unit that determines a transmission period for each determined set, and a plurality of antennas that receive data transmitted from the plurality of communication apparatuses in the determined transmission period for each determined set, and the plurality of communication apparatuses include a communication unit that transmits data to the relay apparatus within the transmission period for each set determined by the relay apparatus.

Abstract: 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.

Abstract: An aspect of the present invention is a wireless communication device including a water flow generator that controls a shape of a partial region on a water surface, and an emission unit that emits a wave carrying information toward the region.

Abstract: The receiving apparatus includes a signal receiver, a second signal reception processor, a first signal reception processor, and a controller. The signal receiver receives the second signal indicating the reception time and the waveform data indicating the waveform of the first signal received from the transmission apparatus by each of the plurality of receiving antennas of the relay apparatus. The second signal reception processor performs reception processing of the second signal to acquire waveform data. The first signal reception processor performs reception processing of the first signal indicated by the waveform data to acquire data set to the first signal by the transmission apparatus. The controller calculates a generation time and a generation position of the interference signal with respect to the first signal on the basis of the observation result of the radio signal in the observation apparatus.

Abstract: A wireless communication system includes: one or more first communication devices located in one or more small areas among a plurality of small areas into which a communication target area is divided; a relay device; and a second communication device, in which the relay device includes: an antenna drive unit that drives one or more antennas to scan the plurality of small areas with one or more beams while emitting the beams to the communication target area, the beams each having an emission range narrower than the communication target area; a reception unit that acquires, from the antennas, a first wireless signal transmitted from the first communication devices located in the emission range; and a transmission unit that transmits a second wireless signal depending on the first wireless signal to the second communication device.

Abstract: A transceiver includes: a plurality of antennas that performs communication with one or more first communication apparatuses serving as reference at the time of forming a communication area and a second communication apparatus located near the one or more first communication apparatuses; a channel estimation unit configured to perform channel estimation for each of the one or more first communication apparatuses based on a known reference signal transmitted from the one or more first communication apparatuses; and an antenna control unit configured to control the plurality of antennas using an estimation value obtained by the channel estimation to form a beam having directivity in a direction in which the one or more first communication apparatuses are located.

Abstract: A wireless communication apparatus includes: a transmission control unit that determines an earlier transmission timing as an elevation angle of a relay apparatus when viewed from the own wireless communication apparatus is larger; and a transmission unit that transmits a wireless signal to the relay apparatus at the transmission timing. The wireless communication apparatus may further include a reception unit that acquires an upper limit value. The transmission control unit may derive a subtraction value, which is a variable value to be used for subtraction, as a larger value as the elevation angle is larger, may subtract the subtraction value from a backoff counter value which is derived based on the upper limit value and is equal to or larger than 0, and may determine, as the transmission timing, a timing at which the backoff counter value becomes equal to or smaller than 0.

Abstract: An acquisition unit acquires a plurality of signals received by a plurality of antennas included in a wireless communication device that moves in a predetermined orbit above a celestial body. A parameter determination unit determines a synthesis parameter of the plurality of signals according to the position of a transmission terminal provided on the celestial body, the orbit, and the reception time of the plurality of signals. A synthesis unit synthesizes a transmission signal of the transmission terminal according to the plurality of signals and the synthesis parameter.

Abstract: A relay device that relays wireless signals transmitted from a plurality of first communication devices to a second communication device while moving includes: a first reception unit configured to receive signals transmitted from the plurality of first communication devices through a reception antenna; and a direction control unit configured to control a reception direction of the reception antenna based on dense district information which is estimated based on the reception of the signals and indicates a district where the first communication devices are located with high density exceeding a predetermined reference.

Abstract: A relay apparatus includes a receiver, a received waveform recorder, a number-of-antennas determiner, and a transmitter. The receiver receives wireless first signals transmitted from the first communication apparatus through a plurality of receiving antennas. The received waveform recorder generates waveform data of the first signals received by the respective plurality of receiving antennas. The number-of-antennas determiner determines the number of receiving antennas according to a relay apparatus position on the basis of information regarding communication quality between the first communication apparatus and the relay apparatus at the relay apparatus position. The transmitter transmits second signals indicating the waveform data of the first signals received by the respective receiving antennas of the number of receiving antennas determined by the number-of-antennas determiner according to the relay apparatus position.

Abstract: A wireless communication system includes one or more communication devices located in a communication target area, and a relay device mountable on a moving body, in which the relay device includes a timing control unit that generates a transmission permission signal that is a signal representing transmission permission of an uplink signal, and a first transmission unit that transmits the transmission permission signal to the communication target area by a beam. The communication device includes a reception unit that obtains the transmission permission signal from the relay device, a transmission control unit that determines an earlier transmission timing as an elevation angle of the relay device viewed from the communication device is larger on a basis of the transmission permission signal, and a second transmission unit that transmits the uplink signal to the relay device at the transmission timing.

Abstract: A wireless communication system includes: a measurement unit that measures a signal level of an analog signal corresponding to a received radio signal; a first output unit that amplifies an amplitude of the analog signal and extracts an analog signal with a desired frequency band from the analog signal with the amplified amplitude; a second output unit that extracts an analog signal with a desired frequency band from the analog signal and amplifies an amplitude of the extracted analog signal; and a switching control unit that inputs the analog signal corresponding to the received radio signal to the first output unit when the signal level of the analog signal other than the desired frequency band is less than a threshold, and inputs the analog signal corresponding to the received radio signal to the second output unit when the signal level of the analog signal other than the desired frequency band is equal to or greater than the threshold.

Abstract: 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.

Abstract: 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