Abstract: A transmission device includes: a first frequency converter configured to convert a frequency of a baseband signal into an intermediate frequency according to a desired OAM mode; a delay line configured to generate a delay in a signal of the intermediate frequency; and a second frequency converter configured to convert the signal of the intermediate frequency in which the delay is generated into a constant radio frequency.

Abstract: A capacity estimation unit estimates a channel capacity related to wireless communication between a communication device and a relay device. A scheme determination unit determines a transmission scheme of the data from the communication device to the relay device to be a scheme in which transmission efficiency is lower and transmission quality is higher as the channel capacity is larger, or to be a scheme in which the transmission quality is lower and the transmission efficiency is higher as the channel capacity is smaller.

Abstract: A second communication device transmits notification information related to a communication status between a transmission device and a first communication device to the transmission device. The transmission device determines a transmission method of data to the first communication device on the basis of the notification information received from the second communication device, and transmits the data to the first communication device by the determined transmission method.

Abstract: Each transmitting apparatus transmits the same radio signals a plurality of times. A communication apparatus includes a plurality of antennas, a signal storage unit, a reading unit, an equalization unit, and a demodulation unit. The plurality of antennas receives radio signals transmitted from a plurality of the transmitting apparatuses. The signal storage unit stores reception signals received by each of the plurality of antennas. The reading unit reads, from the signal storage unit, reception signals including radio signals transmitted from a demodulation processing target transmitting apparatus, the reception signals being received by each of the plurality of antennas at different times. The equalization unit equalizes the plurality of reception signals read by the reading unit. The demodulation unit demodulates the equalized reception signals.

Abstract: An acquisition unit acquires environment information indicating an installation environment of a communication apparatus. A scheme specifying unit specifies a transmission scheme of data on the basis of relational data indicating a relationship between the environment information and the transmission scheme and the acquired environment information. A transmission unit transmits the data to a relay device on the basis of the specified transmission scheme.

Abstract: There is provided a wireless communication device in a wireless communication system including one or more communication devices installed on the ground and a moving wireless communication device, the wireless communication device including: an activation signal generation unit that generates an activation signal for activating the one or more communication devices; a distribution unit that distributes the activation signal generated by the activation signal generation unit; one or more frequency change application units that apply a frequency change to the activation signal distributed by the distribution unit; and a transmission unit that transmits an activation signal to which a frequency change is applied to the one or more frequency change application units.

Abstract: A wireless communication system includes a transmission apparatus and a communication apparatus that moves. Further, the wireless communication system includes a statistics calculation unit, an information generation unit, and a notification unit. The statistics calculation unit acquires a transmission condition used for a first radio signal transmitted from the transmission apparatus in an area and normally received by a reception unit of the communication apparatus, and generates statistical information of the acquired transmission condition. The information generation unit extracts a transmission condition having a high probability that a radio signal is normally received on the basis of the statistical information, and generates transmission control information indicating the extracted transmission condition. The notification unit notifies the transmission apparatus in the area of the transmission control information.

Abstract: In a wireless communication system including a first communication device, one or more second communication devices disposed around the first communication device, and a relay device that moves, the second communication device includes a second reception unit that attempts to receive a radio wave in a predetermined band and measures reception strength, and a second transmission unit that transmits, to the first communication device, reception result information indicating a peripheral radio wave condition based on the reception strength measured by the second reception unit, and the first communication device includes a first reception unit that attempts to receive a radio wave in the predetermined band and measures reception strength, a determination unit that determines a band to be used for transmission of data to the relay device on a basis of a peripheral radio wave condition based on the reception strength measured by the first reception unit and the peripheral radio wave condition based on the receptio

Abstract: A wireless communication system includes a first communication apparatus that moves, a second communication apparatus that moves, and a reception apparatus. A first control unit of the first communication apparatus, when an own apparatus can communicate with any of the reception apparatuses, transmits transmission data acquired by the own apparatus from a first communication unit to the reception apparatus, and, when the own apparatus cannot communicate with any of the reception apparatuses, transmits the transmission data from a second communication unit to the second communication apparatus capable of communicating with the own apparatus. A second control unit of the second communication apparatus transmits the transmission data received by a third communication unit from the first communication apparatus from a fourth communication unit to a reception apparatus capable of communicating with the own apparatus.

Abstract: In a wireless communication system including a communication device and a plurality of relay devices that moves, the relay device includes: a signal reception unit that receives a signal transmitted from the communication device; a reception status information generation unit that generates reception status information indicating a reception status of the signal by the signal reception unit; a reception status information transmission unit that transmits the reception status information generated by the reception status information generation unit to another relay device; a reception status information reception unit that receives reception status information transmitted from another relay device; a calculation unit that calculates a communication parameter value suitable for retransmission of a signal from the communication device to the local device on a basis of the reception status information received by the reception status information reception unit; and a setting information transmission unit that tra

Abstract: A wireless communication system includes a transmission apparatus and a reception apparatus, in which the transmission apparatus includes a plurality of UCAs having a first UCA and a second UCA, the reception apparatus includes a third UCA, a transmission axis of the first UCA and a transmission axis of the second UCA are directed in different directions, and the first UCA faces the third UCA.

Abstract: A transmission apparatus includes: a grid point array antenna including a plurality of antenna elements on a polyhedron; and a control unit that selects a plurality of antenna elements present on any circle from among the plurality of antenna elements of the grid point array antenna as a UCA, and causes the selected UCA to perform OAM transmission.

Abstract: A transmission apparatus includes: a spherical array antenna including a plurality of antenna elements on a spherical surface; and a control unit that selects a plurality of antenna elements present on any circle from among the plurality of antenna elements of the spherical array antenna as a UCA and causes the selected UCA to perform OAM transmission.

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.