Abstract: The position of a movable body is estimated without requiring the movable body to recognize and report its own position, and the position is reflected in a structural model constructed in a computer for the purpose of wireless communication environment evaluation.

Abstract: An objective of the present invention is to use a calculation model to calculate, with good accuracy, behavior of electromagnetic waves within an actual service area. Provided is a radio environment evaluation method that includes constructing, within a computer resource, a structural model for an electromagnetic wave scatterer, and when calculating a characteristic of an electromagnetic field by using the structural model and a ray that simulates a radio wave traveling straight through real space, correcting, in accordance with electromagnetic wave vector measurement data for real space, a state of a polygon included in the structural model.

Abstract: A problem to solve is ensuring communication stability in a service area. One example of a preferable embodiment of the invention is a radio communications method adapted to control physical characteristics of electromagnetic waves that are transmitted by radio units. The radio communications method comprises the following: creating an electromagnetic field model for presuming a communication environment in a service area where the radio units exist by using information on positions and dimensions of objects in the service area; presuming communication characteristics of the radio units through the electromagnetic field model; and modifying the physical characteristics based on the communication characteristics and carrying out communication.

Abstract: A controller of a transmitter outputs cyclically different digital data to equivalent transmission circuits, that is, RF circuits to generate a rotation polarized wave.

Abstract: A wireless communication system that communicates by an electromagnetic wave includes a first wireless device that includes a transmission rotationally polarized wave frequency generator for giving a rotation period to a polarized wave of the electromagnetic wave to be transmitted, transmits a synchronization code by the electromagnetic wave of the polarized wave rotated using the transmission rotationally polarized wave frequency generator, and transmits data by the electromagnetic wave, and a second wireless device that includes a reception rotationally polarized wave frequency generator for giving a rotation period to the polarized wave received in a reception of the electromagnetic wave, calculates transmission timing of the synchronization code included in the received electromagnetic wave of the polarized wave rotated using the reception rotationally polarized wave frequency generator, and sets a signal included in the received electromagnetic wave, as data based on the calculated transmission timing.

Abstract: A transmitter includes: a first transmission block that generates a first radio wave having an information signal modulated thereon and having a plane of polarization that rotates; and a second transmission block that generates a second radio wave having the information signal modulated thereon and having a plane of polarization that is fixed. A receiver includes: a first receive section that demodulates a first radio wave having an information signal modulated thereon and having a plane of polarization that rotates; and a second receive section that demodulates a second radio wave having the information signal modulated thereon and having a plane of polarization that is fixed. The receiver restores the information signal on the basis of the result of reception by the first receive section and the second receive section.

Abstract: A controller of a transmitter outputs cyclically different digital data to equivalent transmission circuits, that is, RF circuits to generate a rotation polarized wave.

Abstract: There is provided a radio communication system configured to communicate with the electromagnetic wave. The radio communication system includes a plurality of slave stations, each configured to transmit and receive the electromagnetic wave using the fixed polarized wave, and a master station including an antenna and a base band circuit, the master station configured to identify a polarization direction of the electromagnetic wave reaching the antenna and a slave station transmitting the electromagnetic wave and notify the identified slave station of a communication timing based on an identified polarized direction. The plurality of slave stations include a plurality of slave stations arranged such that electromagnetic waves transmitted from a plurality of slave stations among the plurality of slave stations reach the antenna of the master station in a plurality of different fixed polarization directions.

Abstract: A highly-secure wireless communication system has a transmitter for transmitting the same information at predetermined polarized wave angles having different rotation-polarized waves for rotating the polarized waves of a carrier wave, and a receiver for restoring the reception information at the aforementioned predetermined polarization wave angles and for comparing the restoration results of the predetermined polarization wave angles with one another.

Abstract: In a thin rotationally polarized antenna which performs highly reliable and highly secure wireless communication, in the case where a feeding point is provided in an integrated plate conductor including a plurality of minute conductor segments and is excited at a first frequency and a second frequency different from the first frequency, matching with a feeding circuit is achieved in both a frequency band including the first frequency and a frequency band including the second frequency. Current distribution formed in orthogonal directions on the plate at the first frequency has the same amplitude and has a phase difference of 90 degrees. Current distribution formed in the same orthogonal directions on the plate at the second frequency has the same amplitude and has a phase difference of 90 degrees, and a phase of the current distribution at the first frequency and a phase of the current distribution at the second frequency have opposite directions.

Abstract: According to one embodiment, a wireless communication system that communicates by an electromagnetic wave includes a first wireless device that includes a transmission rotationally polarized wave frequency generator for giving a rotation period to a polarized wave of the electromagnetic wave to be transmitted, transmits a synchronization code by the electromagnetic wave of the polarized wave rotated using the transmission rotationally polarized wave frequency generator, and transmits data by the electromagnetic wave of the polarized wave rotated using the transmission rotationally polarized wave frequency generator, and a second wireless device that includes a reception rotationally polarized wave frequency generator for giving a rotation period to the polarized wave received in a reception of the electromagnetic wave, calculates transmission timing of the synchronization code included in the received electromagnetic wave of the polarized wave rotated using the reception rotationally polarized wave frequency

Abstract: A wireless communication system includes a plurality of wireless devices that communicate with each other. Each of the wireless devices includes a transmission unit configured to transmit a carrier of a fixed strength with polarization waves thereof rotated to a different one of the wireless devices using two antennae spatially orthogonal to each other, a reception unit configured to receive a carrier transmitted from the transmission unit of the different wireless device, and a timing detection unit configured to detect a timing at which the polarization waves of the carrier received by the reception unit within a period of rotation indicates a maximum strength. The transmission unit performs transmission or reception of a specific information signal using the carrier based on the timing detected by the timing detection unit.

Abstract: There is provided a radio communication system configured to communicate with the electromagnetic wave. The radio communication system includes a plurality of slave stations, each configured to transmit and receive the electromagnetic wave using the fixed polarized wave, and a master station including an antenna and a base band circuit, the master station configured to identify a polarization direction of the electromagnetic wave reaching the antenna and a slave station transmitting the electromagnetic wave and notify the identified slave station of a communication timing based on an identified polarized direction. The plurality of slave stations include a plurality of slave stations arranged such that electromagnetic waves transmitted from a plurality of slave stations among the plurality of slave stations reach the antenna of the master station in a plurality of different fixed polarization directions.

Abstract: In a wireless communication system, wireless communication devices are disposed, each including two orthogonal antennas, a transmitter, and a receiver using rotating polarized wave having a changeable transmission frequency. Specific codes are assigned to the devices, respectively and are shared. In a first of the devices, information and a first code are superimposed on a first carrier wave. In a second of the devices, the transmitted wave is received to reproduce the information with the codes assigned to the second device and the shared code assigned to the first device. The second device transmits second information through modulation using the code thereof. Each of the first and second devices adjusts the propagation frequency for a maximum ratio in intensity of a signal reproduced with the code assigned to another device to an intensity of a signal reproduced with the code assigned to the own device.

Abstract: A wireless system allows for selectively using, and communicating through, wireless propagation paths between radio devices in an over-the-horizen communication environment. Also an elevator control system and a substation monitoring system using the same are provided.

Abstract: Provided is a wireless communication system that achieves high-reliability communication between a transmitter and a receiver.

Abstract: A wireless communication system is disclosed by which, in communication that uses rotationally polarized waves, the information transmission amount is increased to perform communication. A transmitter 101 transmits a signal using polarized waves that are different at different timings using a rotationally polarized wave. In a receiver 201, a reception baseband circuit 20 detects different polarized waves received at timings corresponding to the polarized waves used by the transmitter 101 on a time axis using a plurality of signals equivalent to the received signals to obtain a wireless propagation characteristic between the transmitter 101 and the receiver 201. Then, the transmitter 101 propagates different signals in the form of a plurality of polarized waves at the same time using a plurality of rotationally polarized waves having initial polarization rotation phases different from each other. The transmission capacity can be increased by an amount corresponding to the number of different signals.

Abstract: A radio device includes a transmitter and a receiver. The transmitter transmits rotationally polarized radio waves in a plurality of transmission propagation directions using a plurality of antennas. The receiver receives rotationally polarized radio waves in a plurality of reception propagation directions using a plurality of antennas. The receiver measures changes in rotational loci of polarizations of the radio waves received in the plurality of reception propagation directions corresponding to radio waves transmitted in a plurality of transmission propagation directions. The transmitter performs transmission using a reception propagation direction at which the changes measured by the receiver in the rotational loci of the polarizations of the received radio waves stop.

Abstract: A transmitter includes: a first transmission block that generates a first radio wave having an information signal modulated thereon and having a plane of polarization that rotates; and a second transmission block that generates a second radio wave having the information signal modulated thereon and having a plane of polarization that is fixed. A receiver includes: a first receive section that demodulates a first radio wave having an information signal modulated thereon and having a plane of polarization that rotates; and a second receive section that demodulates a second radio wave having the information signal modulated thereon and having a plane of polarization that is fixed. The receiver restores the information signal on the basis of the result of reception by the first receive section and the second receive section.

Abstract: A radio device includes a transmitter and a receiver. The transmitter transmits rotationally polarized radio waves in a plurality of transmission propagation directions using a plurality of antennas. The receiver receives rotationally polarized radio waves in a plurality of reception propagation directions using a plurality of antennas. The receiver measures changes in rotational loci of polarizations of the radio waves received in the plurality of reception propagation directions corresponding to radio waves transmitted in a plurality of transmission propagation directions. The transmitter performs transmission using a reception propagation direction at which the changes measured by the receiver in the rotational loci of the polarizations of the received radio waves stop.