Abstract: There is a position estimation method executed by a radio communication system including a radio communication device and another radio communication device, and the position estimation method includes a radio step of performing radio communication between the radio communication device and the other radio communication device using a directional beam, a relative position estimation step of estimating a relative position of the other radio communication device with respect to the radio communication device based on a direction of the directional beam in which a reception power of the directional beam is maximum in the other radio communication device and a distance corresponding to a round-trip-time of a radio signal between the radio communication device and the other radio communication device, and an absolute position estimation step of estimating the absolute position of the other radio communication device based on the absolute position of the radio communication device and the relative position of the o

Abstract: The present invention performs: generating base station positional relationship specification data indicating a positional relationship between travel trajectory and a base station candidate position, and terminal station positional relationship specification data indicating a positional relationship between the travel trajectory and a terminal station candidate position, based on travel trajectory data indicating the travel trajectory of a moving body for measuring an object present in a three-dimensional space within a measurable distance predetermined and acquiring point cloud data indicating a position of the object measured in the three-dimensional space, the measurable distance, base station candidate position data indicating a candidate position for installing a base station apparatus, and terminal station candidate position data indicating a candidate position for installing a terminal station apparatus; and specifying a reliability coefficient indicating a degree of reliability of a processing result

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: According to one aspect of the present invention, there is provided a radio communication device that performs communication with a terminal-side communication device having an antenna using an analog signal for transmitting information by a waveform of an amplitude or a phase of light to receive a signal received by the antenna and transmit a signal radiated by the antenna, the terminal-side communication device and the radio communication device being included in a radio communication system that performs radio communication with a communication target terminal via the antenna using time division duplex (TDD), the radio communication device including: an uplink delay adjustment unit configured to adjust a delay caused by propagation of an uplink signal that is a signal flowing from the terminal to the radio communication device via the antenna; and a downlink delay adjustment unit configured to adjust a delay caused by propagation of a downlink signal that is a signal flowing from the radio communication de

Abstract: Provided is a wireless communication system using a single-carrier multi-value modulation scheme, the wireless communication system aiming at preventing erroneous transmission of data and securing a high data rate while utilizing a non-linear region of an amplifier. A reception apparatus acquires, from a transmission apparatus, a specification related to an input/output characteristic of a transmission signal amplifier and transmission power of data transmission. On the basis of the specification and the transmission power, a constellation of signal points is estimated. A reception point, which is a point in constellation coordinates, of a reception signal is detected, and likelihood calculation for the reception point is performed with respect to the signal points. A symbol intended by the reception point is identified on the basis of a result of the likelihood calculation.

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: One aspect of the present invention is a control method of a communication control device for controlling communication of a plurality of base stations in a distributed antenna system, a control method, comprising: a selection step for selecting a beam for communication with a terminal station at some of a plurality of base stations; and an allocation step of allocating a candidate beam associated in advance with the beam selected by a selection step as the candidate beam in which base stations other than some of base stations perform communication with terminal stations.

Abstract: A wireless communication system according to an embodiment is a wireless communication system, in which a transmission device transmits the training signal to a reception device such that a plurality of signal points having different amplitudes on a constellation is included, and the reception device includes: an estimation unit that estimates the signal points included in the training signal of a case where it is assumed that, an input-output characteristic in a non-linear region of an amplifier is also linear; an equalization unit that performs initial equalization on a received signal; a correction unit that corrects a signal subjected to initial equalization by the equalization unit on the basis of the signal points estimated by the estimation unit; a likelihood calculation unit that calculates, with respect to a constellation before the amplifier amplifies a signal, a likelihood of a signal corrected by the correction unit.

Abstract: One aspect of the present invention is a control method in a wireless communication system including a plurality of distributed antennas that perform wireless communication with a user terminal, and a plurality of signal processing units that are connected to the plurality of distributed antennas and perform signal processing, the control method including: a setting unit that sets reference information for leveling loads of the plurality of signal processing units for each of the plurality of signal processing units; an acquisition step of acquiring load information indicating a load of a signal processing unit; and an assignment step of assigning the signal processing unit as a connection destination of the distributed antenna on the basis of the load information acquired in the acquisition step and the reference information, and leveling the loads of the plurality of signal processing units.

Abstract: One aspect of the present invention is a control method in a wireless communication system including a plurality of distributed antennas that perform wireless communication with a user terminal, and a plurality of signal processing units that are connected to the plurality of distributed antennas and perform signal processing, the control method including: an initial assignment step of assigning a distributed antenna to be connected to a signal processing unit; an acquisition step of acquiring load information indicating loads of the signal processing unit; a determination step of determining whether to reassign the distributed antenna to be connected to the signal processing unit on the basis of the load information acquired in the acquisition step; and a reassignment step of performing reassignment and leveling loads of the plurality of signal processing units when it is determined to reassign in the determination step.

Abstract: A communication method determination apparatus includes a comparison unit and an instruction unit. The comparison unit obtains a bit string of a portion of a physical header for synchronization from a wireless frame that includes the physical header for synchronization in which information for synchronization in a physical layer is set and a physical data portion in which data of a higher-level layer than the physical layer is set, and compares the obtained bit string with a bit string pattern specific to a communication method targeted for determination. The instruction unit performs communication method determination processing for determining whether or not the communication method targeted for determination is used for the wireless frame, based on a result of comparison.

Abstract: A line-of-sight determination method includes: a point cloud data acquisition step of acquiring point cloud data including a first position indicating a position of a first wireless station and a plurality of second positions indicating positions on a structure serving as a candidate in which a second wireless station opposing the first wireless station is to be installed; and a line-of-sight determination step of determining whether or not there is a line of sight between the first position and at least one of the second positions, and determining whether or not there is a line of sight between the first wireless station and the structure based on the determination result.

Abstract: An interference wave arithmetic operation method performed by a wireless communication system including a plurality of antennas, the method including: determining an interferer antenna on the basis of information regarding directivity, a position, and an orientation of each of the plurality of antennas; and calculating interference wave reception intensity of a victim antenna using an interference wave from the determined interferer antenna.

Abstract: A wireless communication apparatus includes a terminal selection unit that selects one or more user terminals, a prediction unit that derives a prediction value of an interference amount of a stream group transmitted from a plurality of antennas for the selected one or more user terminals, a collection unit that, when the prediction value of the interference amount is less than a threshold value, collects reception power values of streams included in the stream group from the selected one or more user terminals, an antenna selection unit that selects the plurality of streams in descending order of reception power values and selecting the plurality of antennas associated with the plurality of selected streams, and a transmission unit that transmits the plurality of selected streams by beam forming using the plurality of selected antennas.

Abstract: A wireless communication system includes: a communication control device; and a plurality of wireless base station devices capable of forming a plurality of beams and transmitting signals, the communication control device including: an estimation unit configured to estimate whether or not a range of a first beam emitted by a first wireless base station device among the plurality of wireless base station devices is correlated with a range of a second beam emitted by a second wireless base station device different from the first wireless base station device; and a use prohibition unit configured to prohibit the first wireless base station device from using the first beam or prohibit the second wireless base station device from using the second beam in a case where the estimation unit estimates that the range of the first beam is correlated with the range of the second beam.

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: A control device of the present invention is for provision in a gateway device that includes multiple communication units that perform wireless communication with terminal devices using different communication methods. Based on communication unit individual information that is acquired from the communication units and includes information indicating at least characteristics of the communication methods of the communication units, operations of the communication units are scheduled so as to prevent the overlapping of periods in which the communication units perform signal transmission/reception with the terminal devices.

Abstract: A wireless communication method includes a reception step of receiving a signal transmitted from a first wireless station, a transmission step of transmitting the signal received in the reception step to a second wireless station, a control signal transmission/reception step of transmitting/receiving a control signal related to switching of a reception beam used in the reception step or a transmission beam used in the transmission step, and a beam control step of controlling switching of the reception beam or the transmission beam on the basis of the control signal.

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: A radio communication method performed by a terminal station device includes: a first radio communication step of establishing connection to a first base station device among a plurality of surrounding base station devices; a control step of recording information regarding the first base station device on a storage unit as first connection destination information; and a second radio communication step of establishing connection to a second base station device different from the first base station device with regard to the first connection destination information among the plurality of base station devices.