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Radio communication system, elevator control system, and electric power transformation equipment control system

A wireless communication system and signal technology, applied in elevator control system, substation equipment control system, and wireless communication system fields, can solve problems such as high possibility and difficulty in ensuring wireless communication reliability, and achieve the effect of reducing quality deterioration

Inactive Publication Date: 2014-10-08
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the wireless communication environment of the social infrastructure system, the distance that causes reflection determined by the relative position of everyday appliances as electromagnetic wave scatterers is the distance from the above-mentioned antenna for realizing space diversity, that is, the distance from the electromagnetic wave used in wireless communication. When the half-wavelength is equivalent to the same distance, the energy of the electromagnetic wave reaching the antenna is likely to be zero due to interference caused by other multiple reflections, and it is difficult to ensure the reliability of wireless communication

Method used

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  • Radio communication system, elevator control system, and electric power transformation equipment control system
  • Radio communication system, elevator control system, and electric power transformation equipment control system
  • Radio communication system, elevator control system, and electric power transformation equipment control system

Examples

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Embodiment 1

[0041] In this embodiment, a configuration example of a wireless device that performs wireless communication according to the present invention will be described.

[0042] figure 1 It is an example of a configuration diagram of a transmitter and a receiver constituting the wireless communication system of this embodiment. In the transmitter 1011, a signal in the frequency band of frequency f1 is generated by the information signal generating circuit 3, and the carrier wave generated by the carrier generating circuit 1 is modulated by the modulator 2 using the signal. After the modulated signal is branched, it passes through a plurality of The transmission mixer 5 superimposes the sine waves of different rotational frequencies lower than the frequency of the carrier generated by the plurality of rotational signal generating circuits 4, and the superimposed signals are respectively divided into two branches, and one side of the divided signals is divided into two branches. Synt...

Embodiment 2

[0048] In this embodiment, another configuration example of a wireless device used in the wireless communication system of this embodiment will be described.

[0049] figure 2 It is an example of a configuration diagram of a transmitter and a receiver constituting the wireless communication system in the second embodiment. and figure 1 The embodiment differs in that a circular vertically polarized wave transmitting antenna 882 and an orthogonal vertically polarized wave receiving antenna 883 are used instead of the orthogonal vertically polarized wave transmitting antenna 880 and the orthogonal vertically polarized wave receiving antenna 881 .

[0050] That is, in this embodiment, the circular vertically polarized wave transmitting antenna 882 uses circularly polarized waves with different rotation directions to transmit to space the signal synthesized by the first transmission combining circuit 7 and the signal synthesized by the second transmitting combining circuit 8. si...

Embodiment 3

[0054] In this embodiment, another configuration example of a wireless device used in the wireless communication system of this embodiment will be described. image 3 It is an example of a configuration diagram of a transmitter and a receiver constituting the wireless communication system in the third embodiment.

[0055] and figure 1 The different points of the embodiments are: through the orthogonal vertically polarized wave receiving antenna 881, the receiver 1032 separates the received signal into different orthogonally polarized wave components for reception, and through the first receiving mixer 29, the One side of the separated received signal is multiplied by the output of the first local oscillator 27, wherein the first local oscillator 27 generates a sine wave of the same frequency as the carrier generation circuit 1, and the carrier frequency is removed by the first high-cut filter 25 The above frequency components are converted into digital signals by the first an...

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Abstract

A plurality of rotation-polarized radio waves, which have been modulated by use of the same information signal and which have different rotation speeds, are transmitted; the plurality of radio waves are received; the frequency components corresponding to the respective rotation speeds are extracted; and the information signal to be superimposed on those components is weighted and combined therewith. In this way, a radio circuit line having high reliability can be achieved. A radio communication means having high reliability is provided in social infrastructure systems having various fixture distributions. Also provided is a communication system using a plurality of carriers to which the same modulation has been implemented and which have different rotation speeds of polarized waves.

Description

technical field [0001] The present invention relates to a wireless communication system, an elevator control system, and a power transformation equipment control system, and particularly relates to a wireless communication in which the environment where the wireless machine is placed has an obstacle that reflects / scatters radio waves, and the multiple waves generated by the obstacle are used for communication. System technology. Background technique [0002] With regard to the wireless communication technology that has been significantly developed in the field of broadcasting / communication, it is gradually overcoming the problems of wireless-specific breaks / unable to update areas, improving the reliability of communication lines, and entering communication that requires a large amount of communication compared to calls / audio-visual High-reliability, control / observation field of lines. In particular, in social infrastructure equipment, communication units are more reliable t...

Claims

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Application Information

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IPC IPC(8): H04J11/00
CPCH04B7/002H04B7/10H04L5/04
Inventor 武井健
Owner HITACHI LTD
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