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: 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 radio power transmission apparatus comprises a transmitter 20 having a power transmitting antenna 9 for transmitting electromagnetic waves and a power transmitting circuit and a receiver 40 having a power receiving antenna 29 for receiving electromagnetic waves and a power receiving circuit. In the radio power transmission apparatus, on the basis of power reflected to the power transmitting antenna 9, the power transmitting circuit executes control to change the circuit reactance of the power transmitting circuit in order to control the imaginary part of power of the electromagnetic waves to be transmitted.

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

Abstract: [Object] A wireless communication system capable of detecting propagation path modification from the outside and compensating for degradation of quality of communication between transmission and reception with respect to the propagation path modification is provided. A wireless communication system includes a transmitter that transmits electromagnetic waves in which a polarization direction rotates according to a signal in which data is loaded on a carrier, and a receiver that receives the electromagnetic waves and demodulates the data, in which the transmitter imparts angle information indicating a polarization direction for transferring the data to the signal, and sets a rotation frequency of the polarization direction to a frequency lower than a frequency of the carrier, and the receiver changes a polarization direction of the received electromagnetic waves, based on the angle information transferred by the electromagnetic waves.

Abstract: A wireless transmitter has a modulator modulating an information signal of a frequency f1 by a carrier wave of a frequency f2 to output a first modulated signal, a transmitting antenna transmitting the first modulated signal using a linearly polarized wave, and a motor rotating the transmitting antenna at a frequency f3 to rotate the outgoing linearly polarized wave at the frequency f3 thereby multiplexing the first modulated signal with a linearly polarized wave component and a horizontally polarized wave component, the two components being independent of each other. A wireless receiver has diversity receiving antennas receiving the signal on a plurality of polarization planes to obtain a plurality of input signals; a path difference phase shifter compensating each of the input signals for the phase shift stemming from path differences, and a composer composing the corrected received signals.

Abstract: A wireless communication system is provided that is capable of enabling more wireless devices to perform concurrent communication using a polarized wave technology.

Abstract: A radio apparatus includes a baseband signal generator to generate a baseband signal; a sine wave substituting device to substitute a transition part of the baseband signal in which a logic level switches from “0” to “1” or “1” to “0” with a sine wave represented with multi-values; and a delta sigma modulator to modulate the signal represented in the multi-values into a binary signal.

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: A radio apparatus includes a baseband signal generator to generate a baseband signal; a sine wave substituting device to substitute a transition part of the baseband signal in which a logic level switches from “0” to “1” or “1” to “0” with a sine wave represented with multi-values; and a delta sigma modulator to modulate the signal represented in the multi-values into a binary signal.

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: The radio communication system includes a radio transmitter which performs up-sampling on an information signal, and performs modulation on a carrier wave using the sampled information signal to transmit the modulated carrier wave, and a radio receiver which receives transmission waves transmitted from the radio transmitter, and demodulates the information signal. The radio transmitter includes a transmission processing unit that generates the transmission waves, and a transmission unit that rotates polarized waves of the transmission waves with a predetermined rotation frequency, and wirelessly transmits the transmission waves, and the transmission processing unit copies the sampled information signal, multiplies the copied information signals by predetermined weighting factors, and generates the transmission waves by assigning the information signals on a time axis such that the copied information signals are respectively transmitted with different polarization angles.

Abstract: A wireless communication system is provided that is capable of enabling more wireless devices to perform concurrent communication using a polarized wave technology.

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: A wireless transmitter has a modulator modulating an information signal of a frequency f1 by a carrier wave of a frequency f2 to output a first modulated signal, a transmitting antenna transmitting the first modulated signal using a linearly polarized wave, and a motor rotating the transmitting antenna at a frequency f3 to rotate the outgoing linearly polarized wave at the frequency f3 thereby multiplexing the first modulated signal with a linearly polarized wave component and a horizontally polarized wave component, the two components being independent of each other. A wireless receiver has diversity receiving antennas receiving the signal on a plurality of polarization planes to obtain a plurality of input signals; a path difference phase shifter compensating each of the input signals for the phase shift stemming from path differences, and a composer composing the corrected received signals.

Abstract: A wireless transmitter has a modulator modulating an information signal of a frequency f1 by a carrier wave of a frequency f2 to output a first modulated signal, a transmitting antenna transmitting the first modulated signal using a linearly polarized wave, and a motor rotating the transmitting antenna at a frequency f3 to rotate the outgoing linearly polarized wave at the frequency f3 thereby multiplexing the first modulated signal with a linearly polarized wave component and a horizontally polarized wave component, the two components being independent of each other. A wireless receiver has diversity receiving antennas receiving the signal on a plurality of polarization planes to obtain a plurality of input signals; a path difference phase shifter compensating each of the input signals for the phase shift stemming from path differences, and a composer composing the corrected received signals.

Abstract: [Object] A wireless communication system capable of detecting propagation path modification from the outside and compensating for degradation of quality of communication between transmission and reception with respect to the propagation path modification is provided. A wireless communication system includes a transmitter that transmits electromagnetic waves in which a polarization direction rotates according to a signal in which data is loaded on a carrier, and a receiver that receives the electromagnetic waves and demodulates the data, in which the transmitter imparts angle information indicating a polarization direction for transferring the data to the signal, and sets a rotation frequency of the polarization direction to a frequency lower than a frequency of the carrier, and the receiver changes a polarization direction of the received electromagnetic waves, based on the angle information transferred by the electromagnetic waves.

Abstract: The radio communication system includes a radio transmitter which performs up-sampling on an information signal, and performs modulation on a carrier wave using the sampled information signal to transmit the modulated carrier wave, and a radio receiver which receives transmission waves transmitted from the radio transmitter, and demodulates the information signal. The radio transmitter includes a transmission processing unit that generates the transmission waves, and a transmission unit that rotates polarized waves of the transmission waves with a predetermined rotation frequency, and wirelessly transmits the transmission waves, and the transmission processing unit copies the sampled information signal, multiplies the copied information signals by predetermined weighting factors, and generates the transmission waves by assigning the information signals on a time axis such that the copied information signals are respectively transmitted with different polarization angles.

Abstract: A wireless transmitter transmits a first transmission wave having a first carrier frequency (f0+?f), modulated by a modulator with an information signal having a frequency band f1 which is predetermined, from a transmitting antenna, and transmits a second transmission wave having a second carrier frequency (f0??f), modulated by a modulator with such information signal. An average frequency f0 between the first carrier frequency (f0+?f) and the second carrier frequency (f0??f) is kept constant, whereas the first carrier frequency (f0+?f) and the second carrier frequency (f0??f) are varied by controlling a frequency difference ?f to vary.

Abstract: It is an object to provide signal processing device and method by use of wireless communication, which is capable of analyzing status of the wireless communication in detail at a later date, compressing a wireless signal such that it can be reproduced, and reproducing the compressed signal to perform its re-reception. The signal processing device includes a reception processing unit that performs reception processing of a received signal wirelessly, a signal recording unit that records the signal, a signal compression unit that compresses an information amount of the received signal, and a signal output unit that stores the received signal that has been compressed or outputs the same to an external device.