Abstract: A wireless communication method includes phase shift amount determination processing for determining a random phase shift amount for each of subcarriers of transmission data. The wireless communication method further includes modulation processing for modulating the transmission data and further shifting a phase according to the random phase shift amount for each of the subcarriers. The wireless communication method further includes precoding processing for performing precoding on the transmission data after the modulation processing, and transmission processing for transmitting the transmission data after the precoding processing from the transmission device to the reception device.

Abstract: The wireless transmission device includes a power amplifier that varies transmission power. An SNR degradation amount calculation unit calculates an SNR degradation amount {QAM} caused by QAM and an SNR degradation amount {APSK} caused by APSK on the basis of input/output characteristics of the power amplifier acquired from an input/output characteristic storage unit, a QAM modulated signal acquired from a QAM modulation unit, an APSK modulated signal acquired from an APSK modulation unit, and the transmission power of the power amplifier. A modulation scheme selection unit acquires a required SNR {QAM} of QAM and a required SNR {APSK} of APSK from a required SNR storage unit, compares “required SNR {QAM}+SNR degradation amount {QAM}” with “required SNR {APSK}+SNR degradation amount {APSK}”, and selects the modulation scheme with the smaller value.

Abstract: A wireless transmission device and a wireless receiver that support at least two multi-level modulation schemes are used. The multi-level modulation scheme includes a first modulation scheme (QAM) and a second modulation scheme (APSK) having a shorter minimum Euclidean distance on the constellation and a lower PAPR than the first modulation scheme. A power amplifier has a function of changing transmission power. A transmission power control unit determines transmission power, and the power amplifier changes the transmission power. A modulation scheme selection unit compares the transmission power with a threshold value set on the basis of a boundary point at which a linear region and a nonlinear region of the power amplifier are switched, selects the QAM when the transmission power is not greater than the threshold value, and selects the APSK when the transmission power is greater than the threshold value.

Abstract: A wireless communication method includes phase shift amount determination processing for determining a phase shift amount for each symbol of transmission data, modulation processing for modulating the transmission data and further shifting a phase according to the phase shift amount for each symbol, and precoding processing for performing precoding on the transmission data after the modulation processing. The transmission data after the precoding processing is transmitted from the transmission device to the reception device. A plurality of types of phase shift patterns prepared in advance define different phase shift amounts. The phase shift amount determination processing includes: selecting, from among the plurality of types of phase shift patterns, one that minimizes a PAPR of the transmission data after the precoding processing or one that maximizes a data reception quality in the reception device; and determining the phase shift amount for each symbol according to the selected phase shift pattern.

Abstract: A wireless transmission device and a wireless reception device that support QAM and APSK are used. The wireless transmission device includes a power amplifier that varies transmission power. A constellation calculation unit calculates an estimated constellation {QAM} predicted to occur when a QAM-modulated signal is amplified by the power amplifier at desired transmission power on the basis of input/output characteristics of the power amplifier, and similarly calculates an estimated constellation {APSK} predicted to occur when an APSK-modulated signal is amplified at the desired transmission power. A modulation scheme selection unit compares an estimated minimum Euclidean distance on the estimated constellation {QAM} with an estimated minimum Euclidean distance on the estimated constellation {APSK}, and selects the modulation scheme having the longer distance.

Abstract: A wireless communication method includes phase shift amount determination processing for determining a random phase shift amount for each of streams of transmission data. The wireless communication method further includes modulation processing for modulating the transmission data and further shifting a phase according to the random phase shift amount for each of the streams. The wireless communication method further includes precoding processing for performing precoding on the transmission data after the modulation processing, and transmission processing for transmitting the transmission data after the precoding processing from the transmission device to the reception device.

Abstract: A wireless communication method includes phase shift amount determination processing for determining a phase shift amount for each stream of transmission data, modulation processing for modulating the transmission data and further shifting a phase according to the phase shift amount for each stream, and precoding processing for performing precoding on the transmission data after the modulation processing. The transmission data after the precoding processing is transmitted from the transmission device to the reception device. A plurality of types of phase shift patterns prepared in advance define different phase shift amounts. The phase shift amount determination processing includes: selecting, from among the plurality of types of phase shift patterns, one that minimizes a PAPR of the transmission data after the precoding processing or one that maximizes a data reception quality in the reception device; and determining the phase shift amount for each stream according to the selected phase shift pattern.

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: 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: A radio station selection method includes an acquisition step of acquiring image information indicating an image obtained by capturing a space through which a radio wave is able to propagate in communication between a first radio station and a second radio station, an estimation step of estimating a propagation loss of a radio wave in the communication on the basis of the image information acquired in the acquisition step, and a determination step of determining whether or not to switch a radio station to which the first radio station is connected for communication from the second radio station to a third radio station on the basis of the propagation loss estimated in the estimation step.

Abstract: A transport device and a transport method efficiently increase a thrust to suppress power consumption. The transport device has a first magnetic body on a side of a to-be-transported object, a magnetic circuit with a core consisting of a second magnetic body, and a winding wound around an outside of the core, and a drive circuit supplying a current to the winding of the magnetic circuit. The magnetic circuit has first and second magnetic circuits, and in a case where the first magnetic body is located on a side of the second magnetic circuit relative to a first predetermined position between the first magnetic circuit and the second magnetic circuit, the drive circuit supplies a current to a winding of the first magnetic circuit in such a manner to cause an electromagnetic repulsive force to be generated between the first magnetic body and the first magnetic circuit.

Abstract: A wireless communication method wherein among a signal processing function and a communication function provided by a wireless communication device, a centralized unit having a signal processing function transmits an optical signal having a form corresponding to a downstream radio signal to be a transmission target in the communication function, to a communication target radio unit which communicates with an external communication device among two or more radio units having a communication function connected to the centralized unit via an optical fiber, and performs beam forming control of the communication target radio unit, and the communication target radio unit, according to control of the centralized unit, communicates with the external communication device.

Abstract: A wireless fixed-line phone router to which at least a wireless fixed-line phone is connected includes a first communication unit that performs communication according to a first mobile communication standard, a second communication unit that performs communication according to a second mobile communication standard that is a mobile communication standard different from the first mobile communication standard and is capable of performing communication in a wider range than the first mobile communication standard, and a control unit that causes the second communication unit to perform communication in a case where communication quality deteriorates when the first communication unit performs communication.

Abstract: A beam setting method includes a communication method prediction step of predicting a communication method performed on the basis of whether there is a line-of-sight between a first radio station device and a second radio station device; a first beam number setting step of setting the number of beams transmitted by a beam sweep, in which signals using formable beams are sequentially transmitted in a time-division manner, to a first constant, when the communication method prediction step predicts that communication is performed by the communication method using reflected waves; and a second beam number setting step of setting the number of beams transmitted by the beam sweep to a second constant smaller than the first constant, when the communication method prediction step predicts that communication is performed by the communication method using line-of-sight waves.

Abstract: On two-dimensional map data indicating buildings serving as candidates for installing terminal station devices, locations of base station installation structures serving as candidates for installing base station devices are set as base station candidate locations, and for each of the base station candidate locations, buildings that have other buildings between themselves and the base station candidate location are selected as visibility detection subject buildings. The heights of the buildings are set at an identical length, a higher position than the buildings is set as an installation altitude of the base station devices, and for each selected visibility detection subject building, a visibility range of the visibility detection subject building from the installation altitude of the base station device in the base station candidate location is detected.

Abstract: A radio communication method performed by a radio communication device includes an inverse fast Fourier transform step of performing inverse fast Fourier transform on a digital electric signal associated with a downlink radio signal, a digital-to-analogue conversion step of converting the digital electric signal subjected to the inverse fast Fourier transform into a first analogue electric signal, an electro-optic conversion step of converting the first analogue electric signal into an optical signal, a step of transmitting the optical signal, a photoelectric conversion step of converting the transmitted optical signal into a second analogue electric signal, and a step of transmitting the downlink radio signal corresponding to the second analogue electric signal.

Abstract: Using an array antenna in which a spacing between adjacent antenna elements is constant, each of combinations of two antenna elements in positions symmetrical relative to a center of an array is connected by wire connections in two paths, and a path length between the antenna elements in the combination of two antenna elements is the same in all of the combinations: a phase adjustment amount is calculated for each wire connection aside from a reference wire connection on the basis of an arrival direction of a wireless signal received by one antenna element in the combination of two antenna elements and a re-radiation direction of a wireless signal transmitted as a re-radiated wave by the other antenna element corresponding to the one antenna element, taking into account a phase difference between a signal transmitted by the wire connections connected to the one antenna element and a signal transmitted by the reference wire connection; and phase rotation is applied to the signal transmitted by the wire connect

Abstract: A method of estimating inter-user orthogonality in a distributed antenna system in which a base station includes a plurality of distributed antennas installed at a plurality of locations and which performs simultaneous radio transmissions with a plurality of user stations, the method of estimating inter-user orthogonality including the steps of: estimating a position of each of the user stations on the basis of installation positions of the plurality of distributed antennas, beam directions of the plurality of distributed antennas to each user station being a radio transmission partner, and an antenna height of each of the user stations; estimating an interference radio wave direction on the basis of the position of each of the user stations estimated in the step of estimating a position and installation positions of the plurality of distributed antennas; and calculating an angle difference between the beam direction and the interference radio wave direction to estimate orthogonality between the user stations

Abstract: In two-dimensional map information showing communication equipment installation structures on which communication equipment is installed, roads, and buildings, a narrow region between the buildings is detected based on a distance of an interval of the buildings adjacent to each other and a predetermined length and a connection line connecting the buildings is imparted to an opened portion of the detected narrow region, a line-of-sight detection line is extended with any one of the communication equipment installation structures set as a start point and the line-of-sight detection line is rotated around the start point, intersections of the line-of-sight detection line and a contour line of the building or the connection line is detected and the intersection at a shortest distance from the start point among the detected intersections is detected as a line-of-sight intersection, and, when the line-of-sight intersection and another line-of-sight intersection belong to the same building, a line-of-sight range lin

Abstract: A position measurement method includes a point group data generation step of generating point group data indicating a position of an object around a predetermined route measured by a measurement unit moving along the route, an acquisition step of acquiring a plurality of pieces of point group data generated by being measured at different timings with respect to the same route, and a position identification step of identifying a detection target position indicating a position of a predetermined object present around the route on the basis of a difference in the position for each of the plurality of pieces of point group data.