Abstract: A measurement device configured to move along a movement path and measure the position of an object in surroundings of the movement path includes: a measurement unit configured to measure the position of the object with a plurality of surfaces as measurement targets, the plurality of surfaces facing in directions different from each other; and a point group data generation unit configured to generate point group data of the object in surroundings of the movement path by using positional data representing the position of the object measured by the measurement unit.

Abstract: A master station device is connected to a slave station device that emits a transmission signal received by light via an optical transmission path from a plurality of antenna elements.

Abstract: A wireless transmitter/receiver generates a first signal which notifies timing of a time slot allocated to each wireless station device, a conversion unit converts the first signal into an optical signal, and each of a plurality of antenna units converts the first signal from the optical signal into an electrical signal and transmits the electrical signal wirelessly. The wireless station device transmits a second signal at the timing reported by the first signal. Each of the plurality of antenna units converts the second signal wirelessly received from each wireless station device into an optical signal, and the conversion unit converts the second signal from the optical signal into an electrical signal.

Abstract: To n antenna elements of the base station, n wavelengths set at predetermined intervals in a range in which chromatic dispersion in an optical fiber between accommodation and base stations can be regarded as constant are assigned. The accommodation station adjusts the phases of optical signals of the wavelengths or modulated signals that modulate the optical signals such that the amounts of phase shift of their RF signals are at predetermined intervals. The accommodation station transmits beacon signals multiple times while varying a transmission phase shift interval ?1 and the terminal transmits beacon number information of a beacon signal selected based on received power multiple times. The accommodation station varies a reception phase shift interval ?2 for each piece of beacon number information to determine a reception phase shift interval ?2 which maximizes the received power and determines the transmission phase shift interval ?1 based on the beacon number information received from the terminal.

Abstract: An AP 3 and STAs 5 acquire time information from an external device, and synchronize time. The AP 3 sets, in a first signal, a transmission start time of the first signal, and transmits the first signal to the STA 5. The STAs 5 transmit, to the AP 3, a second signal in which a delay time is set, the delay time being calculated from a difference between the transmission start time acquired from the first signal and a reception start time of the first signal at the own station. The AP 3 acquires delay time from the second signal of each STA 5, decides a timing for permitting transmission by each of the STAs 5 by time division, on the basis of the acquired delay time, and notifies the STAs 5 thereof. The STAs 5 each effect control to start transmission of signals to the AP 3 at the timing notified from the AP 3.

Abstract: There is provided an allocation method for allocating individual downlink data signals to positions on a time axis when a base station transmits the individual downlink data signals to a plurality of terminal stations.

Abstract: A derivation method includes: a transmission step of transmitting, to a wireless terminal, a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time and information on a second reception time; a transmission time period derivation step of deriving a first round trip time and deriving a second round trip time; and an optical fiber length derivation step of deriving an optical fiber length, based on the first round trip time, the second round trip time, a group velocity or a group delay time of the optical signal with the first wavelength, and a group velocity or a group delay time of the optical signal with the second wavelength.

Abstract: To n antenna elements of the base station, n wavelengths set at predetermined intervals in a range in which chromatic dispersion in an optical fiber between accommodation and base stations can be regarded as constant are assigned. The accommodation station adjusts the phases of optical signals of the wavelengths or modulated signals that modulate the optical signals such that the amounts of phase shift of their RF signals are at predetermined intervals. The accommodation station transmits beacon signals multiple times while varying a transmission phase shift interval ?1 and the terminal transmits beacon number information of a beacon signal selected based on received power multiple times. The accommodation station varies a reception phase shift interval ?2 for each piece of beacon number information to determine a reception phase shift interval ?2 which maximizes the received power and determines the transmission phase shift interval ?1 based on the beacon number information received from the terminal.

Abstract: A master station device is connected to a slave station device that emits a transmission signal received by light via an optical transmission path from a plurality of antenna elements.

Abstract: A derivation method is a derivation method performed by a communication system, including: a transmission step of transmitting a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time that is a reception time related to the first radio-wave signal, and information on a second reception time that is a reception time related to the second radio-wave signal; and an optical fiber length derivation step of deriving a length of the optical fiber, based on the first communication start time, the first reception time, the second communication start time, the second reception time, a group velocity or a group delay time of the optical signal wit

Abstract: A wireless transmitter/receiver generates a first signal which notifies timing of a time slot allocated to each wireless station device, a conversion unit converts the first signal into an optical signal, and each of a plurality of antenna units converts the first signal from the optical signal into an electrical signal and transmits the electrical signal wirelessly. The wireless station device transmits a second signal at the timing reported by the first signal. Each of the plurality of antenna units converts the second signal wirelessly received from each wireless station device into an optical signal, and the conversion unit converts the second signal from the optical signal into an electrical signal.