WO2017119285A1

WO2017119285A1 - Wireless communication system, wireless machine, wireless communication method, elavator control system and substation control system

Info

Publication number: WO2017119285A1
Application number: PCT/JP2016/088011
Authority: WO
Inventors: 武井　健
Original assignee: 株式会社日立製作所
Priority date: 2016-01-05
Filing date: 2016-12-21
Publication date: 2017-07-13
Also published as: JP2019062246A

Abstract

The purpose of the present invention is to implement a wireless system having a high tolerance for artificial or natural disturbance and interference in a specified propagation path. Simultaneously in a pair of wireless machines 201, 401 having a transmission/reception function, transmitters transmit information using a radio wave the polarization of which rotates at a frequency different from the frequency of a carrier wave, and receivers three-dimensionally receive incoming waves of all polarizations using a plurality of antennas, extract the trajectory of an elliptical rotational polarization having an arbitrarily defined rotational plane vector obtained by three-dimensional synthesis of the incoming waves, obtain, by calculation, rotational polarizations showing circular trajectories having a finite plurality of unique rotational plane vectors capable of reproducing the trajectory, and perform communication selectively using transmission paths corresponding to the obtained plurality of rotational polarizations.

Description

Wireless communication system, wireless device, wireless communication method, elevator control system, and substation control system

The present invention relates to a wireless communication system, a wireless device, a wireless communication method, an elevator control system, and a substation control system, and in particular, a transmitter transmits using time-sequentially different polarized waves, and receivers are simultaneously different. The present invention relates to a radio communication system for controlling polarization, a radio, a radio communication method for operating the radio communication system, an elevator control system and a substation control system using the radio communication system.

High-efficiency operation of social infrastructure systems that produce and distribute energy, water, gas, oil, etc. is important for the realization of a sustainable society. High-efficiency operation of a social infrastructure system is realized by, for example, high-efficiency operation of devices constituting the system, and requires a device monitoring / control network that enables the operation. In order to perform high-efficiency operation of the device, a technology that places a large number of sensors on the device and estimates and predicts the operation status of the device from a lot of obtained data is promising. In this way, the network for collecting and analyzing data from many sensors, estimating operating conditions, and transmitting control information to the same equipment has a large number of transmission paths, so wireless technology replaces conventional wired technology. A network configuration is desired. Social infrastructure systems provide a lifeline to society, so when a network is artificially or naturally affected by a specific transmission line that is damaged or obstructed, communication is performed without using the damaged or obstructed transmission line. The function that can provide a lifeline is extremely important. In general, in wireless communication, since the transmission path is an open space, a plurality of transmission paths are automatically formed between transmission and reception points. It is assumed that the communication quality of the network deteriorates due to a transmission path failure and interference, and the network may be down. In wired communication, an outsider can specify a transmission path, so if an outsider discovers or intervenes in a transmission path, the possibility of seriously affecting the supply of the lifeline cannot be completely denied. That is, in the wireless communication and the wired communication according to the prior art, it is assumed that a network having strong resistance to a specific and artificial failure or disturbance of a transmission path cannot always be realized.

Sensors and actuators that control the devices that make up the social infrastructure system are themselves electromagnetic wave scatterers. Therefore, in wireless networks that use electromagnetic waves as communication media, the wireless devices that make up the networks are expected. It is not expected to communicate in a state, and is operated in a special situation in which communication is performed in a non-line-of-sight state using multiple reflected waves reflected by the device. Since electromagnetic waves are vector waves and the physical reality called polarization perpendicular to the traveling direction due to reflection changes inherently, radio waves of the same polarization that are automatically emitted from a transmitter in multiple directions Inherent reflection is performed by the device, and arrives at the receiver as a plurality of radio waves that have undergone a specific polarization change through a plurality of propagation paths. Therefore, the receiver uses an unpredictable polarization direction generated by vector combination of the plurality of incoming radio waves. Due to transmission / reception symmetry of wireless communication using electromagnetic waves, unpredictable changes in polarization direction between transmission and reception are inherent to a specific pair of transmitters and receivers, and are irregular every moment as the radio wave environment changes. Make a change.

As a prior art, there is a communication system in which a transmitter and a receiver aim to improve communication quality by using an optimal set of polarized waves corresponding to a change in radio wave environment, as disclosed in Japanese Patent Application Laid-Open No. 2003-520545. Has been proposed.

JP 2003-520545 A

In the prior art as described above, in order to perform communication using a specific set of polarized waves between transmission and reception, a single transmission line is used between transmission and reception. There was a problem that the communication quality greatly fluctuated due to road disturbance and disturbance.

In view of the above, an object of the present invention is to realize a network that has strong resistance to transmission path failures and disturbances.

According to the first solution of the present invention,
A wireless communication system,
The transmitter transmits information using a radio wave whose polarization is different from the frequency of the carrier wave and whose polarization is lower than that of the carrier wave.
The receiver
Using three antennas to receive an incoming wave of polarization from multiple directions in three dimensions, obtain three signals of polarization parallel to three axes orthogonal to each other,
Extract the elliptical trajectory including the direction of arrival of the ellipse rotation polarization obtained by three-dimensional synthesis of the incoming wave, the inclination of the major axis, and the ratio of the major axis to the minor axis,
With reference to a table that stores in advance the outputs obtained from the three antennas for the combination of the arrival direction of the circularly polarized waves coming from a plurality of directions in three dimensions and the elliptical trajectory, a finite plurality of the reproducible elliptical trajectories can be reproduced. Find one or more circularly polarized waves that exhibit a unique circular trajectory,
There is provided a wireless communication system that performs communication using a transmission path corresponding to one or a plurality of obtained rotationally polarized waves.

According to the second solution of the present invention,
A radio,
The transmitter receives information transmitted by using a radio wave whose polarization is different from that of the carrier wave and whose polarization is lower than that of the carrier wave.
Using three antennas to receive an incoming wave of polarization from multiple directions in three dimensions, obtain three signals of polarization parallel to three axes orthogonal to each other,
Extract the elliptical trajectory including the direction of arrival of the ellipse rotation polarization obtained by three-dimensional synthesis of the incoming wave, the inclination of the major axis, and the ratio of the major axis to the minor axis,
With reference to a table that stores in advance the outputs obtained from the three antennas for the combination of the arrival direction of the circularly polarized waves coming from a plurality of directions in three dimensions and the elliptical trajectory, a finite plurality of the reproducible elliptical trajectories can be reproduced. Find one or more circularly polarized waves that exhibit a unique circular trajectory,
Communicate using a transmission line corresponding to the obtained one or more rotational polarizations,
A radio is provided.

According to the third solution of the present invention,
A wireless communication method in a wireless communication system, comprising:
The transmitter transmits information using a radio wave whose polarization is different from the frequency of the carrier wave and whose polarization is lower than that of the carrier wave.
The receiver
Using three antennas to receive an incoming wave of polarization from multiple directions in three dimensions, obtain three signals of polarization parallel to three axes orthogonal to each other,
Extract the elliptical trajectory including the direction of arrival of the ellipse rotation polarization obtained by three-dimensional synthesis of the incoming wave, the inclination of the major axis, and the ratio of the major axis to the minor axis,
With reference to a table that stores in advance the outputs obtained from the three antennas for the combination of the arrival direction of the circularly polarized waves coming from a plurality of directions in three dimensions and the elliptical trajectory, a finite plurality of the reproducible elliptical trajectories can be reproduced. Find one or more circularly polarized waves that exhibit a unique circular trajectory,
Communicate using a transmission line corresponding to the obtained one or more rotational polarizations,
A wireless communication method is provided.

According to the fourth solution of the present invention,
An elevator control system to which the wireless communication system as described above is applied is provided.
According to the fifth solution of the present invention,
A substation control system to which the wireless communication system as described above is applied is provided.

According to the present invention, it is possible to realize a network having strong resistance to transmission path failures and disturbances.

It is an example of the block diagram of the radio | wireless communications system of a present Example. It is an example of the other block diagram of the radio | wireless communications system of a present Example. It is an example of the other block diagram of the radio | wireless communications system of a present Example. It is an example of the other block diagram of the radio | wireless communications system of a present Example. It is an example of the other block diagram of the radio | wireless communications system of a present Example. It is an example of the other block diagram of the radio | wireless communications system of a present Example. It is an example of the other block diagram of the radio | wireless communications system of a present Example. It is an example of the structure figure of the radio | wireless machine of the radio | wireless communications system of a present Example. It is an example of the structure figure of the other radio | wireless machine of the radio | wireless communications system of a present Example. It is an example of the structure figure of the other radio | wireless machine of the radio | wireless communications system of a present Example. It is an example of the block diagram of the elevator system to which the radio | wireless communications system of a present Example is applied. It is an example of the block diagram of the substation system to which the radio | wireless communications system of a present Example is applied. It is a figure explaining operation | movement of the radio | wireless communications system of a present Example. It is explanatory drawing of the table about the combination and output of a rotational polarization of a present Example. It is a flowchart of the digital signal processing of a present Example.

Hereinafter, examples will be described with reference to the drawings.

A. Overview
In this embodiment, a transmitter and a receiver communicate using a plurality of polarizations, and a plurality of different received waves are formed by different combinations of a plurality of transmission paths corresponding to the plurality of polarizations. When a specific transmission line is manually or naturally disturbed and interfered with a specific transmission line by using the received wave, the transmission line that has suffered the disturbance or disturbance Communication without using.

The present embodiment includes a plurality of means for solving the above-mentioned problems. For example, a pair of radios having a transmission / reception function simultaneously transmits information at a frequency different from the frequency of the carrier wave. Transmits using a rotating radio wave, the receiver receives incoming waves of any polarization in three dimensions using multiple antennas, and has an arbitrary rotation plane vector obtained by three-dimensional synthesis of the incoming waves Ellipsoidal rotation polarization trajectory is extracted, and a circular polarization with a finite number of unique rotation plane vectors that can reproduce the trajectory is obtained by calculation. It is possible to perform communication by selectively using a transmission path to be performed.

In this embodiment, when the transmitter performs transmission using a radio wave whose polarization rotates at a frequency sufficiently lower than the frequency of the carrier wave, the receiver uses a three-dimensional vector of incoming waves that have passed through a plurality of propagation paths. Receive the sum. Since the incoming wave passing through each propagation path is still a rotationally polarized wave at the receiving point, the three-dimensional vector sum becomes an elliptical rotationally polarized wave having an arbitrary rotational plane vector. This elliptical circularly polarized trajectory can be reproduced three-dimensionally by a finite number of circularly polarized waves, and therefore a finite number of rotationally polarized waves that can be identified by a specific rotation plane vector and a specific polarization angle shift. A rotational transmission path can be obtained. The intensity of a rotationally polarized wave having an arbitrary rotation plane vector can be made extremely strong (for example, 1/100 or less) by a linearly polarized antenna whose direction coincides with the rotation plane vector. Furthermore, by associating a cycle code with a low sidelobe with one cycle corresponding to a sufficiently low polarization frequency, a rotation polarization whose direction of the rotation plane vector does not match that of the antenna has a high code gain. The signal carried in all rotational polarizations is reproduced. Using these characteristics, it is possible to select a transmission path that propagates a plurality of individual rotational polarizations that reproduce the received three-dimensional polarization trajectory. As a result, it is possible to realize a network that is highly resistant to a specific transmission line failure and disturbance.

B. Radio and radio communication system

In the present embodiment, a configuration example of a wireless system in which a transceiver (radio device) uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIGS. 1 and 13.

FIG. 1 is an example of a configuration diagram of a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization.

The transmitter of the first wireless device 301 is configured to superimpose the output of the cyclic code generation circuit 11 on one of the two branches of the output of the information signal generator 1 by the first transmission multiplier 2 and then the second transmission multiplier. 4 multiplies the output of the cosine rotation polarization frequency generation circuit 3 and branches the output into three branches. The first branch output is multiplied by a constant by the cosine X-axis weighting circuit 5 and becomes the first input of the first transmission synthesis circuit 7, and the second branch output is multiplied by a constant by the cosine Y-axis weighting circuit 15 to be the second input. This becomes the first input of the transmission synthesis circuit 17, and the third branch output is multiplied by a constant by the cosine Z-axis weighting circuit 25 and becomes the first input of the third transmission synthesis circuit 27. The output of the cyclic code generation circuit 11 is superposed by the fourth transmission multiplier 12 on the other of the two branches of the output of the information signal generator 1, and then the sine rotation polarization frequency generation circuit by the fifth transmission multiplier 14. 13 outputs are multiplied and the output is divided into three branches. The first branch output is multiplied by a constant by the sine X-axis weighting circuit 6 and becomes the second input of the first transmission synthesis circuit 7, and the second branch output is multiplied by a constant by the sine Y-axis weighting circuit 16 and the second input This becomes the second input of the transmission synthesis circuit 17, and the third branch output is multiplied by a constant by the sine Z-axis weighting circuit 26 and becomes the second input of the third transmission synthesis circuit 27. The output of the first transmission synthesis circuit 7 is multiplied by the output of the carrier frequency generation circuit 39 by the fifth transmission multiplier 8, and radio waves are radiated from the first transmission antenna 10 to the space via the first power amplifier 9. Then, the output of the second transmission synthesis circuit 17 is multiplied by the output of the carrier frequency generation circuit 39 by the sixth transmission multiplier 18, and the radio wave is transmitted from the second transmission antenna 20 to the space via the second power amplifier 19. The output of the third transmission synthesis circuit 27 is multiplied by the output of the carrier frequency generation circuit 39 by the seventh transmission multiplier 28, and the radio wave is transmitted from the third transmission antenna 30 to the space via the third power amplifier 29. Radiate. The

transmission antennas

10, 20, and 30 are spatially orthogonal to each other.

The receiver of the first wireless device 301 obtains a reception electric field simultaneously using the first reception antenna 140, the second reception antenna 150, and the third reception antenna 160 that are spatially orthogonal. The output of the first receiving antenna 140 is amplified by the first low noise amplifier 141 and then multiplied by the output of the local transmission circuit 149 that generates a signal having the same frequency as the carrier frequency by the first receiving multiplier 142. The output is input to the first buffer amplifier 144 via the first band pass filter 143, and the output is sequentially delayed by the plurality of first delay units 145 and input to the digital signal processing circuit 148. The output of the second receiving antenna 150 is amplified by the second low noise amplifier 151, and then multiplied by the output of the local transmission circuit 149 that generates a signal having the same frequency as the carrier frequency by the second receiving multiplier 152. The output is input to the second buffer amplifier 154 via the second band pass filter 153, and the output is sequentially delayed by the plurality of second delay units 155 and input to the digital signal processing circuit 148. The output of the third receiving antenna 160 is amplified by the third low noise amplifier 161 and then multiplied by the output of the local transmission circuit 149 that generates a signal having the same frequency as the carrier frequency by the third receiving multiplier 162. The output is input to the third buffer amplifier 164 via the third band pass filter 163, and the output is sequentially delayed by the plurality of third delay units 165 and input to the digital signal processing circuit 148. Information signal generator 1, cyclic code generation circuit 11, first transmission multiplier 2, second transmission multiplier 4, cosine rotation polarization frequency generation circuit 3, cosine X-axis weighting circuit 5, first transmission synthesis circuit 7, cosine Y-axis weighting circuit 15, second transmission synthesis circuit 17, cosine Z-axis weighting circuit 25, third transmission synthesis circuit 27, fourth transmission multiplier 12, fifth transmission multiplier 14, sinusoidal rotation Polarization frequency generation circuit 13, sine X-axis weighting circuit 6, sine Y-axis weighting circuit 16, sine Z-axis weighting circuit 26, first delay unit 145, signal processing circuit 148, second delay unit 155, third The delay unit 165 is formed in the digital module 201.

Since the second radio 401 has the same configuration and operation as the first radio 301, the description thereof is omitted. The number of each part of the transmitter of the first radio 301 and the number in the 100s of each part of the transmitter of the second radio 401 are shown correspondingly, and the number of the receiver of the second radio 401 is also shown. The numbers of the respective units and the numbers in the 100s of the respective units of the receiver of the first wireless device 301 are shown correspondingly.

The radio 301 includes three transmitting

antennas

10 and 20 and 30 that are spatially orthogonal to each other. These antennas have an amplitude weight by a cosine X-axis weighting circuit 5, a cosine Y-axis weighting circuit 15, a cosine Z-axis weighting circuit 25 and a sine X-axis weighting circuit 6, a sine Y-axis weighting circuit 16, and a sine Z-axis weighting circuit 26. Attached. The common input of the three cosine weighting circuits and the common input of the three sine weighting circuits are inputs to two antennas that are spatially orthogonal to each other. In order to rotate the radio waves from the two antennas orthogonal to each other in a three-dimensional manner, the same spatial rotation weight may be given to the two antennas. There are an infinite number of ways to give this spatial weight. For example, if Euler angles θ and φ are used as parameters, cosine X-axis weighting circuit 5 and sine X-axis weighting circuit 6 have sin θ cos φ, cosine Y-axis weighting circuit 15 and sine. The Y-axis weighting circuit 16 is sin θsinφ, and the cosine Z-axis weighting circuit 25 and the sine Z-axis weighting circuit 26 are cos θ. These parameters are controlled by the digital signal processing circuit 148. As a result, the radio 301 has a circularly polarized wave whose propagation direction coincides with any one direction and has a circular locus, and a circularly polarized wave that rotates at a frequency ω and a polarized wave that has any (multidirectional) propagation direction is a circle. A rotating polarized wave rotating at a frequency ω with a locus of Strictly speaking, a fixed polarization whose magnitude changes at a frequency ω is radiated in a direction in which the polarization is fixed in a direction orthogonal to the propagation direction of the rotational polarization whose rotation rotates at a frequency ω with a circular locus. However, in a broad sense, this can be called a rotationally polarized wave whose polarization rotates with a frequency ω with a locus of an ellipse. The same operation is performed for the transmission of the wireless device 401.

The radio 401 includes three receiving

antennas

40 and 50 and 60 that are spatially orthogonal to each other. One polarization radiated from the transmitter rotates at a frequency ω with a circular trajectory, and one with an infinite number of circular rotations at a frequency ω with a circular trajectory. It is reflected on the surface of a plurality of radio wave scatterers that generally surround the two radios that perform. During this reflection, the polarization angle of the rotational polarization is shifted by a value specific to the incident angle of the rotational polarization with respect to the surface and the normal direction of the surface. Of the rotational polarization transmitted from the transmitter, the rotational polarization reflected by the surface of the wave scatterer that reaches the receiver is limited to that satisfying Snell's law between the transmission point, the reflection point, and the reception point. It is done. Therefore, the number of rotational polarizations reaching the receiver out of the rotational polarizations transmitted from the transmitter is finite. The receiver is preliminarily provided with a table storing three outputs obtained by three antennas for a large number of combinations of rotationally polarized waves coming from a plurality of directions three-dimensionally. There are innumerable methods for creating the table, but it can be created as shown in FIG. 14, for example.

FIG. 14 is an explanatory diagram of a table for the combination and output of the rotational polarization of the present embodiment. The table of FIG. 14 is created as follows. In the synthesis of rotationally polarized waves having a finite number of arrival directions, polarized waves arriving from a specific direction become rotationally polarized waves rotating at a frequency ω with a locus of an ellipse. The signal output by the combination of two antennas out of the antennas has an ellipse locus in which the major axis of the polarization coming from one specific direction is tilted (rotated at an angle in virtual two-dimensional coordinates) The locus of the rotationally polarized wave rotating at the frequency ω is shown. Since the number of waves arriving at the receiver is known to be finite, this number is determined with an integer N as an upper limit. Since there is a practical limit to the accuracy of the arrival direction of one incoming wave that can be identified by three antennas spatially orthogonal to each other provided in the receiver, the resolution is represented by ΔΘ and ΔΦ. ΔΘ is the resolution of the elevation angle Θ that varies from 0 ° to 180 °, and ΔΦ is the resolution of the azimuth angle Φ that varies from 0 ° to 360 °. Rotating polarized waves with a circular trajectory rotating at a frequency ω are considered to be a special case of rotating polarized waves having a circular trajectory rotating at a frequency ω. The inclination is ψ, and the ratio of the major axis to the minor axis is ρ. Since there is a limit to the calculation accuracy of ψ and ρ of the receiver, their resolutions are assumed to be Δψ and Δρ. Δψ is the resolution of ψ that changes the value from 0 ° to 180 °, and Δρ is the resolution of ρ that changes the value from 1 to R. Here, R is determined with an integer as an upper limit. Using each resolution, the candidate values of Θ, Φ, ψ, and ρ can be expressed as iΔΘ, jΔΦ, kΔψ, and lΔρ, which are denoted as Θ _i , Φ _j , ψ _k , and ρ _l . However, i, j, and k are non-negative integers, and l is a positive integer. The slope of the major axis and the ratio of the major axis to the minor axis of the elliptical locus of the polarization of the output of each combination of the two orthogonal antennas of the three receiving antennas by the incoming wave having a plurality of Θ _i , Φ _j , ψ _k , ρ _l Are Ψ ^m and Ρ ^m , respectively. m is a variable that identifies each combination of two orthogonal antennas of 1 to 3 receiving 3 antennas. If the number of i, j, k, l is I, J, K, L, the number of columns in the table of FIG. 14 is I × J × K × L + 3, and the number of rows below the second row is _{I *.} is a _{J * K *} L _{C N.}

FIG. 15 is a flowchart of the digital signal processing of this embodiment.
The outline of the processing of the digital

signal processing circuits

48 and 148 will be described below with reference to the flowchart of FIG.
First, the digital

signal processing circuits

48 and 148 perform variable initialization by setting ΔΨ ^m = 0 and Δ ＝ ^m = 0 (S101). Next, the digital

signal processing circuits

48 and 148 individually accumulate the outputs of the three antennas spatially orthogonal to each other on the time axis (S103). As described above, the cosine X-axis weighting circuit 5 and the sine X-axis weighting circuit 6 are sin θ cos φ, the cosine Y-axis weighting circuit 15 and the sine Y-axis weighting circuit 16 are sin θ sin φ, the cosine Z-axis weighting circuit 25, and the sine Z-axis weighting circuit 26. Is cos θ, E1 (t) = rsinθcosφ, E2 (t) = rsinθsinφ), and E3 (t) = rcosθ (where r represents amplitude). Next, the digital

signal processing circuits

48 and 148 calculate the temporal change of the signal strength over one period of the rotational polarization for the three combinations of the two, and the polarization of the rotational polarization input to each orthogonal two antenna. It obtains the trajectory of the waves, obtained by calculating the ratio [rho ^m of inclination [psi ^m and major axis and a minor axis of the major axis of the ellipse trajectory of rotation polarized wave input to each of two orthogonal antenna from the trajectory [(Ψ ^{^1,} Ρ ¹ ), ([Psi] ² , [Phi] ² ), ([Psi] ³ , [Phi] ³ )] (S105). Next, the digital

signal processing circuits

48 and 148 find a set of rotational polarizations ψ ′ ^m and Ρ ′ ^m indicating the closest values from the obtained Ψ ^m and Ρ ^m using the table of FIG. 14 [(Ψ ^{′ 1} , Ρ ′ ¹ ), (ψ ′ ² , Ρ ′ ² ), (ψ ′ ³ , Ρ ′ ³ )] (S107). Here, at first, the digital

signal processing circuits

48 and 148 are Yes in step S109 due to the initialized variable in step S101, and the process proceeds to step S111. The digital

signal processing circuits

48 and 148 include the inclination of the major axis and the ratio of the major axis to the minor axis (Ψ ′ ^m , ′ ′ ^m ) with respect to the set of orthogonal two antennas indicated by the set of rotational polarization obtained by the table, The difference between the values Ψ ^m and Ρ ^m obtained from the received wave is stored as ΔΨ ^m and ΔΡ ^{m in} an appropriate memory such as an internal memory (S111).

Next, the digital

signal processing circuits

48 and 148 refer to the table, set θ and φ by Θ and Φ corresponding to Ψ ′ ^m and Ρ ′ ^m , and set the direction in which the rotational polarization of the transmitter is radiated. The parameters of the cosine X-axis weighting circuit 5, the cosine Y-axis weighting circuit 15, the cosine Z-axis weighting circuit 25, the sine X-axis weighting circuit 6, the sine Y-axis weighting circuit 16, and the sine Z-axis weighting circuit 26 are changed (S113).

The digital

signal processing circuits

48 and 148 can radiate a rotationally polarized wave in one specific direction of the space by setting the angles θ and φ using three spatially orthogonal transmitting antennas. The necessity to control the direction of rotation of the rotational polarization arises because the trajectory of the rotational polarization of one elliptical trajectory reproduced by the set of rotational polarizations obtained by the table is the rotational deviation of the actually received elliptical trajectory. This is a case where the difference from the wave trajectory is large. Since the number of rotational polarization pairs that can be stored in the table is limited, ideally, the candidate values for Θ, Φ, ψ, and ρ must be continuous values. Represented by a finite number of discrete values. This resolution determines how the candidate values of Θ, Φ, ψ, and ρ faithfully simulate the rotational polarization constituting the rotational polarization of the elliptical locus that is actually received. Since the capacity of the table is practically limited, by changing the direction of the rotational polarization to be transmitted slightly, the rotational polarization trajectory of one elliptical trajectory reproduced by the set of rotational polarization obtained by the table The difference between the actually received elliptical trajectory and the rotational polarization trajectory is reduced. The digital

signal processing circuits

48 and 148 change the values of the common inputs of the three cosine weighting circuits coupled to the three transmitting antennas and the values of the three sine weighting circuits with an appropriate algorithm (for example, a random change or a minute change of the parameter). Then, control is performed so that the locus of rotational polarization of the elliptical trajectory reproduced by the obtained candidate values of Θ, Φ, ψ, and ρ and the same trajectory actually obtained from the received signal are as close as possible.

Further, it will be described in detail as follows. Ψ and ρ described in the table are those of the rotationally polarized wave of the elliptical polarization locus arriving at the receiver. The transmitter transmits the obtained Θ and Φ (if there are a plurality of pairs of Θ and Φ, a specific one of them) as new θ and φ. Then, the above operation is repeated. Thereby, the difference between θ and φ used by the transmitter and θ and φ obtained by calculation (table comparison) by the receiver converges to a constant value (not necessarily zero). The case where there are a plurality of pairs of Θ and Φ will be described in detail as follows. For example, it is assumed that the set of Θ and Φ is (Θ1, Φ1), (Θ2, Φ2), and (Θ3, Φ3). From this, Θ1 and Φ1 are selected to be θ and φ used by the transmitter. Next, from the set of Θ and Φ obtained, the one close to the original Θ1 and Φ1 is selected and set as θ and φ used by the next transmitter. If any of the multiple pairs of Θ, Φ that the receiver obtains in the calculation (table comparison) is significantly different from the previously selected pair of Θ, Φ, One set is randomly selected from the set, and θ and φ are used by the next transmitter. Such a process is repeated. As a result, the rotational polarization of the circularly polarized trajectory in the propagation direction determined by θ and φ finally transmitted by the transmitter is subjected to a plurality of reflections by a plurality of radio wave reflectors existing between the transmitter and the receiver. A plurality of elliptical polarization trajectories having a set of Θ, Φ, ψ, and ρ are converted into rotationally polarized waves.

Also, the digital

signal processing circuits

48 and 148 set the parameters of the transmitter of the local radio device, and also transmit the information to the radio device of the counterpart side to thereby set the parameters of the transmitter of the counterpart radio device. Are set by the digital

signal processing circuits

148 and 48 of the other radio. A method for transmitting information on these parameters to the radio device on the other side may be implemented by an appropriate method. After changing the parameters, the digital

signal processing circuits

48 and 148 return to step S103 and perform the same operation on the received wave.

The digital

signal processing circuits

48 and 148 repeat the same operation while the difference ΔΨ ^m and ΔΡ ^m is decreased, for example, by comparing the newly calculated difference (for example, by comparing with a predetermined threshold value). When the decrease in the difference reaches a peak (S109), a set of a plurality of rotational polarizations shown in the table is determined as a finite number of rotational polarizations used for communication (used for communication) (S115). The digital

signal processing circuits

48 and 148 may store parameter information (information including Θ and Φ) in an internal memory. Various methods have been known so far to change the direction of the rotationally polarized wave radiated by the transmitter, the representative of which is to change the direction at random, and the minimum of the objective function by changing the direction slightly. There is something that aims to be. In the latter case, the operation shown in the flowchart of FIG. 15 changes the direction of the rotationally polarized wave radiated by the transmitter to a specific direction, and maintains that direction while the objective functions ΔΨ ^m and ΔΡ ^m decrease. ^{When m 1} and ΔΡ ^m increase, the direction is changed, and when it is determined that the objective functions ΔΨ ^m and ΔΡ ^m converge regardless of the change in direction, the operation is terminated.

After the finite rotational polarization arriving at the received wave is determined, the propagation direction of each finite number of rotational polarizations and the polarization direction at each time are known, so the outputs of the three antennas that are spatially orthogonal to each other Are weighted and added to a digital signal processing circuit to realize an antenna having a specific polarization direction virtually realized in space by the three antennas, and a specific propagation direction and a specific polarization. It becomes possible not to receive radio waves. The technique relating to the weighting and the direction of the virtual antenna is the same as the technique used in the transmission antenna. With this principle, in this embodiment, it is possible to select an incoming wave in a specific propagation direction, that is, a specific propagation path formed between transmission and reception points.

Since the first wireless device 301 and the second wireless device 401 are communicating by changing the polarization periodically at the rotational polarization frequency at the same time, the first wireless device 301 and the second wireless device 401 can reduce the first by making the rotational polarization frequency sufficiently low. The transmission / reception timing of the wireless device 301 and the transmission / reception timing of the second wireless device 401 can be made substantially the same. For example, when the communication service area is several hundred meters, if the rotational polarization frequency is 100 kHz, the wavelength corresponding to the same frequency is 3 km. In general, when the phase difference of radio waves is 1/10 wavelength or less, there is little possibility that the phase affects communication. This is because the interference at which the amplitude of the radio wave is attenuated is maximum at 1/2 wavelength, and the effect of attenuation is practically negligible at 1/10 wavelength. In addition, phase modulation used in general communication is BPSK and QPSK, and is based on phase change corresponding to 1/2 wavelength and 1/4 wavelength. Therefore, phase change corresponding to 1/10 wavelength corresponds to phase modulation. The effect can be ignored in practice. When performing multilevel phase modulation to transmit very high-speed data, a phase change corresponding to 1/16 wavelength or a phase change corresponding to 1/64 wavelength is used. In this case, 1/10 The change in phase corresponding to the wavelength cannot be ignored. The background of the present invention and / or the present embodiment is the monitoring and control of a device that provides a lifeline, and the amount of information transmission suitable for the current application is on the order of several hundred kbps or less, and the phase corresponding to 1/10 wavelength. There is no need for high-speed data transmission in which changes in the data become a problem.

FIG. 13 is a diagram for explaining the operation of the wireless communication system of the present embodiment.
In general, it is desirable that the frequency of the rotationally polarized wave be sufficiently long (5 times or more) for the same frequency as compared to the arrangement interval of the fixtures serving as a plurality of electromagnetic wave scatterers existing between the transceivers. In this case, a plurality of incoming waves arriving at the second wireless device 401 via a plurality of propagation paths from the first wireless device 301 may be regarded as being in phase with respect to the polarization rotation. Therefore, a single rotational polarization having the same rotational plane vector and the same rotational polarization frequency having a transmission polarization and an inherent polarization angle difference is obtained. The second radio 401 removes the carrier wave component from the outputs of the first receiving antenna 40, the second receiving antenna 50, and the third receiving antenna 60 that are spatially orthogonal to each other, and outputs signals of three systems of rotational polarization frequencies. Sampling in a time sufficiently shorter than the period of the rotational polarization by digital signal processing (preferably less than one quarter and preferably less than one eighth), and using it as a baseband signal, The trajectory of the polarization can be calculated and obtained three-dimensionally. The three-dimensional trajectory obtained by this calculation becomes a single elliptical rotational polarization having an arbitrary rotation plane vector as shown in FIG. The rotational frequency is equal to the transmitted rotational polarization. As described above, a single elliptical rotational polarization having an arbitrary rotation plane vector can be reconstructed by calculation using a finite rotation polarization having a unique rotation plane vector.

This elliptical circularly polarized trajectory can be reproduced three-dimensionally by a finite number of circularly polarized waves, and therefore a finite number of rotationally polarized waves that can be identified by a specific rotation plane vector and a specific polarization angle shift. A rotational transmission path can be obtained. The intensity of a rotationally polarized wave having an arbitrary rotation plane vector can be made extremely strong (1/100 or less) by a linearly polarized antenna whose direction coincides with that of the rotation plane vector. Furthermore, a cyclic code having a low sidelobe in one cycle corresponding to a sufficiently low polarization rotation frequency is generated by the cyclic code generation circuit and is associated with one cycle of the rotation polarization. Rotation polarized waves whose directions do not coincide with each other are reproduced by a high code gain of the same cyclic code. In this embodiment, it is possible to select a transmission path that propagates a plurality of individual rotational polarizations that reproduce the received three-dimensional polarization trajectory using these characteristics, and a transmission path that has been damaged or disturbed. Therefore, it is possible to realize a network having a strong resistance against an artificial or natural failure or disturbance of a specific transmission line.

Since the first radio 301 and the second radio 401 can transmit and receive at the same time, it may be considered that the information on the polarization angle is automatically shared simultaneously at the rotational polarization frequency due to the symmetry of the radio communication. The baseband circuit can know the timing when the reception sensitivity of the radio receiver becomes maximum, and can also know the initial phase and three-dimensional weighting of the cyclic code at that time. In this embodiment, the baseband circuit converts the initial phase data and the stereoscopic weighting data into a cyclic code generation circuit, a cosine X-axis weighting circuit, a cosine Y-axis weighting circuit, a cosine Z-axis weighting circuit, a sine X-axis weighting circuit, and a sine Y. By supplying to the axis weighting circuit and the sine Z-axis weighting circuit, there is an effect of maintaining good communication quality between transmission and reception following the change in the radio wave environment in which the wireless system is operating.

In the present embodiment, another configuration example of a wireless system in which a transceiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIG.

FIG. 2 is an example of another configuration diagram of a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization. 1 is different from the embodiment of FIG. 1 in that the first radio 302 and the second radio 402 have cosine X-axis weighting circuits 5 and 105, cosine Y-

axis weighting circuits

15 and 115, cosine Z-

axis weighting circuit

25 and 125, sine X-axis weighting circuits 6 and 106, sine Y-

axis weighting circuits

16 and 116, sine Z-axis weighting circuits 26 and 126, first transmission synthesis circuits 7 and 107, second transmission synthesis circuits 17 and 117, The third transmission combining circuits 27 and 127, the sixth transmission multipliers 18 and 118, the second power amplifiers 19 and 119, and the second transmission antennas 20 and 120 are not provided, and the

composite control lines

31 and 131 are single. It is a point that has been replaced by the control line. As illustrated, each unit is formed in the digital module 202 and the digital module 202a.

According to the present embodiment, the transmitters of the

radios

302 and 402 cannot radiate rotational polarization in any direction, and radiate rotational polarization only in one fixed direction. It is assumed that the radiation direction of a large rotational polarization cannot be used. However, in an environment where there are many fixtures between the transmitter and the receiver, and the radio waves radiated from the transmitter have a lot of reflected waves that reach the receiver through a plurality of different paths, they are formed by their reflection. Since the number of rotational polarizations that can be selectively used by the receiver is large, functions other than the function related to the direction of the rotational polarization transmitted in the embodiment of FIG. 1 can be realized with fewer components. Manufacturing cost can be reduced.

In the present embodiment, another configuration example of a wireless system in which a transceiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIG.
FIG. 3 is an example of another configuration diagram of a radio system in which a transceiver uses a rotational polarization and selectively uses a plurality of rotational polarization propagation paths. 2 is different from the embodiment of FIG. 2 in that the first radio 303 and the second radio 403 have the second

low noise amplifiers

51 and 151, the third low noise amplifiers 61 and 161, and the second reception multiplication. Multipliers 52 and 152, third reception multipliers 62 and 162, second bandpass filters 53 and 153, third bandpass filters 63 and 163, second buffer amplifiers 54 and 154, and third buffer amplifier 64. 164, the second delay device 55, and the third second delay device 65 are not present, and the first delay device 45 is replaced by the delay device 35, and the

second reception antennas

50 and 150 and the third reception device are replaced. The receiving antenna changeover switch 46 for switching between the

antennas

60 and 160 is provided, and these antennas and the first low noise amplifier 41 are coupled. As illustrated, each unit is formed in the digital module 203 and the digital module 203a.

The reception antenna changeover switch 46 is sequentially switched by a control signal from the baseband circuit 48, and the output of the first buffer amplifier 44 is three times as many delays as the delay amount of one third of the first delay unit 45. To the subordinate combination of the device 35. According to the present embodiment, when the period of the rotational polarization is sufficiently larger than the shortest processing time of the baseband circuit, the interval obtained by equally dividing the period of the rotational polarization is further divided into three parts that are spatially orthogonal to each other. By switching the two receiving antennas, the same effect as that of the embodiment of FIG. 2 can be realized with a small number of components, so that the manufacturing cost of the radio can be reduced.

In the present embodiment, another configuration example of a wireless system in which a transceiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIG.
FIG. 4 is an example of another configuration diagram of a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization. The difference from the embodiment of FIG. 2 is that composite

code control circuits

21 and 121 and code changeover switches 36 and 136 are newly provided, and the code changeover switches 36 and 136 and the cyclic

code generation circuits

11 and 111 are controlled. Having

lines

32 and 132. As illustrated, each unit is formed in the digital module 204 and the digital module 204a.

The

baseband circuits

48 and 148 generate timing for superimposing the synchronization code on the rotational polarization by the code changeover switches 36 and 136, and the transmitter and receiver synchronize with each other by the synchronization code having a large correlation gain by the cyclic code. According to the present embodiment, it is possible to improve the accuracy of signal processing over the transmission and reception of the wireless system, so that there is an effect of improving the communication quality of the propagation path due to the plurality of rotational polarizations used by the receiver. As in the present embodiment, the embodiment of FIG. 1 includes synchronous

code generation circuits

21 and 121 and code changeover switches 36 and 136, and controls the code changeover switches 36 and 136 and the cyclic

code generation circuits

11 and 111. By introducing new

composite control lines

32 and 132, the effect of the embodiment can be given to the embodiment of FIG.

In the present embodiment, another configuration example of a radio system in which a transceiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIG.
FIG. 5 is an example of another configuration diagram of a wireless system in which the transceiver uses the rotational polarization and selectively uses a plurality of rotational polarization propagation paths. 4 differs from the embodiment of FIG. 4 in that it includes cyclic code generation circuit arrays 22 and 122 instead of the cyclic

code generation circuits

11 and 111, code selection switches 56 and 156 instead of the code changeover switches 36 and 136, The

composite control lines

33 and 133 for controlling the code selection switches 56 and 156 and the cyclic code generation circuit arrays 22 and 122 are provided. As illustrated, each unit is formed in a digital module 205 and a digital module 205a.

The cyclic code generation circuit arrays 22 and 122 generate different cyclic codes having a weak cross-correlation with each other, and the code selection switches 56 and 156 select the different codes and superimpose them on the outputs of the

signal generation circuits

1 and 101. Due to the weak cross-correlation characteristics of the different codes, the first wireless device 305 and the second wireless device 405 can identify a plurality of wireless devices other than themselves. With this identification function, the wireless device of this embodiment can communicate with a plurality of wireless devices by switching the cyclic code generation circuit, so that the area on the time axis in which the wireless devices accommodated in the wireless system can simultaneously communicate increases. Therefore, there is an effect of improving the throughput of the wireless system.

FIG. 6 is an example of another configuration diagram of a radio system in which a transceiver uses a rotational polarization and selectively uses a plurality of rotational polarization propagation paths. The difference from the embodiment of FIG. 2 is that the first and second radios are newly provided with

time generation circuits

47 and 147. As illustrated, each unit is formed in the digital module 206 and the digital module 206a.

In the wireless system of the present embodiment, the digital

signal processing circuits

48 and 148 indicate the rotation plane vector of the elliptically rotationally polarized wave calculated by the receivers of the first and second wireless devices and the change timing of the elliptical shape. It is obtained by the same method as in the first embodiment and stored in the

time generation circuits

47 and 147.
Once the values are stored in the

time generation circuits

47 and 147, the digital

signal processing circuits

48 and 148 use the outputs of the

time generation circuits

47 and 147 to generate signs of the cyclic

code generation circuits

111 and 11 for a certain period of time. Determine timing. After the predetermined period has passed, the digital

signal processing circuits

48 and 148 indicate the rotation plane vector of the elliptically polarized wave and the change timing of the elliptical shape calculated by the receivers of the first and second radio units from the digital

signal processing circuits

48 and 148. Obtained in the same manner as in the embodiment of FIG. According to the present embodiment, since the operation of the digital signal processing circuit included in the wireless device can be simplified, the power consumption of the wireless device can be reduced, which is effective in reducing the power consumption of the entire wireless system.

FIG. 7 is an example of another configuration diagram of a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization. The difference from the embodiment of FIG. 6 is that communication

state storage devices

57 and 157 and

data buses

67 and 167 are newly provided. As illustrated, each unit is formed in the digital module 207 and the digital module 207a.

The communication

state storage devices

57 and 157 are coupled to the digital

signal processing circuits

48 and 148, respectively, and the plane-of-rotation polarization plane vector calculated by the receiver of the first radio unit 307 and the second radio unit 407 is obtained. The elliptical information can be stored in time series, and the information can be transmitted to the outside of the first wireless device 307 and the second wireless device 407 using the

data buses

67 and 167. The wireless system of the present embodiment is a time-series change in the environment that affects the propagation of radio waves surrounding the wireless system by examining changes in the plane of rotation and elliptical shape of the elliptically rotating polarization obtained by calculation by the receiver. Can be detected, and a maintenance function for stably operating the wireless system can be obtained, so that the operation of the wireless system of this embodiment can be stabilized and the time required to restore the system in response to an unexpected situation can be shortened. It becomes possible.

In this embodiment, another configuration example of a transmitter used in a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization will be described with reference to FIG.

FIG. 8 is an example of another configuration diagram of a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization. 1 differs from the wireless device of the embodiment of FIG. 1 in that the first transmitting antenna 10, the second transmitting antenna 20, the third transmitting antenna 30, the first receiving antenna 40, the second receiving antenna 50, the third Instead of the first receiving antenna 60, a first transmitting / receiving antenna 70, a second transmitting / receiving antenna 80, and a third transmitting / receiving antenna 90 are provided, and a first circulator 71, a second circulator 81, and a second circulator 81 are newly provided. 3 circulators 91 are provided. The first transmitting / receiving antenna 70 is connected to the first terminal of the first circulator 71, the second transmitting / receiving antenna 80 is connected to the first terminal of the second circulator 81, and the third transmitting / receiving is connected to the first terminal of the third circulator 91. Each shared antenna 90 is coupled. The output of the first power amplifier 9 is connected to the second terminal of the first circulator 71, the output of the second power amplifier 19 is connected to the second terminal of the second circulator 81, and the third terminal is connected to the second terminal of the third circulator 91. The outputs of the power amplifiers 29 are combined. The input of the first low noise amplifier 141 is input to the third terminal of the first circulator 71, the input of the second low noise amplifier 19 is input to the third terminal of the second circulator 81, and the third terminal of the third circulator 91 is connected. The inputs of the third low noise amplifier 29 are respectively coupled. As illustrated, each unit is formed in the digital module 208.

Since the first circulator 71, the second circulator 81, and the third circulator 91 transmit signals in the circulation order of the terminals, the first transmitting / receiving antenna 70, the second transmitting / receiving antenna 80, and the third transmitting / receiving are used. The antenna 90 radiates the outputs of the first power amplifier 9, the second power amplifier 19, and the third power amplifier 29 to the space, and converts the power of the electromagnetic wave arriving at the radio unit 308 to the first low noise amplifier 141 and the first power amplifier. The signals are input to the second low noise amplifier 151 and the third low noise amplifier 161. According to the present embodiment, the same function as that of the wireless device of the embodiment of FIG. 1 can be realized with three antennas, which is effective in reducing the size of the wireless device and reducing the manufacturing cost of the wireless device.

In the present embodiment, another configuration example of a transmitter used in a wireless system in which a transmitter / receiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIG.

FIG. 9 is an example of another configuration diagram of a radio system in which a transceiver uses a rotational polarization and selectively uses a plurality of rotational polarization propagation paths. The difference from the wireless device of the embodiment of FIG.
The wireless device 309 includes a first antenna switch 72, a second antenna switch 82, and a third antenna switch 92 instead of the first circulator 71, the second circulator 81, and the third circulator 91. . As illustrated, each unit is formed in the digital module 209.

The first transmitting / receiving antenna 70 is connected to the common terminal of the first antenna switch 72, the second transmitting / receiving antenna 80 is connected to the common terminal of the second antenna switch 82, and the third transmitting / receiving terminal is connected to the common terminal of the third antenna switch 92. Each shared antenna 90 is coupled. The output of the first power amplifier 9 is connected to the first terminal of the first antenna switch 72, the output of the second power amplifier 19 is connected to the first terminal of the second antenna switch 82, and the first terminal of the third antenna switch 92. Are coupled to the outputs of the third power amplifier 29, respectively. The input of the first low noise amplifier 141 is input to the second terminal of the first antenna switch 72, the input of the second low noise amplifier 19 is input to the second terminal of the second antenna switch 82, and the The inputs of the third low noise amplifier 29 are coupled to the two terminals, respectively.

According to the present embodiment, functions similar to those of the wireless device of the embodiment of FIG. 1 can be realized without using three antennas and a large and heavy circulator, so that the size and weight of the wireless device can be reduced and the wireless device can be manufactured. Effective for cost reduction.

FIG. 10 is an example of another configuration diagram of a radio system in which a transceiver uses a rotational polarization and selectively uses a plurality of rotational polarization propagation paths. The wireless device 210 includes two shared antennas, one receiving antenna, and two circulators, and the configuration of the receiving circuit is the same as that of the wireless device 301 in FIG. The transmitter of the radio device 310 divides the output of the information signal generator 1 into two branches, and the output of the first cosine wave carrier generation circuit 78 and the output of the second cosine wave carrier generation circuit 79 by the cosine transmission multiplier 76. The output is multiplied by a beat-like carrier wave formed by adding the adder 77, the output of the cyclic code generation circuit 11 is superimposed by the first transmission multiplier 2, and subsequently multiplied by the first delta-sigma circuit 97. Then, the signal is amplified by the first power amplifier 9 through the cosine bandpass filter 95 and input to the first terminal of the first circulator 71. A difference between the output of the first sine wave carrier wave generation circuit 89 and the output of the second sine wave carrier wave generation circuit 89 is obtained by a subtractor 87 by the sine transmission multiplier 86 on the other side of the output of the information signal generator 1 in two branches. The beat-shaped carrier waves formed by the signals are multiplied and the output of the cyclic code generation circuit 11 is superposed by the second transmission multiplier 12 and then multiplied by the second delta-sigma circuit 98 to obtain a sine band-pass filter. Amplified by the second power amplifier 19 via 96 and input to the first terminal of the third circulator 91. The first delta sigma circuit 97 and the second delta sigma circuit 98 are supplied with an operation clock by a clock generation circuit 99.

In the receiver of the radio 310, the output of the third terminal of the first circulator 71 is amplified by the first low noise amplifier 141, and then a signal having the same frequency as the carrier frequency is output by the first reception multiplier 142. The generated local oscillator 149 output is multiplied, and the output is input to the first buffer amplifier 144 via the first band-pass filter 143, and the output is sequentially delayed by the plurality of first delay devices 145. Each is input to the digital signal processing circuit 148. The output of the third terminal of the third circulator 91 is amplified by the third low noise amplifier 161, and then output from the local oscillator circuit 149 that generates a signal having the same frequency as the carrier frequency by the third reception multiplier 162. And the output is input to the third buffer amplifier 164 via the third band-pass filter 163, and the output is sequentially delayed by the plurality of third delay units 165 and input to the digital signal processing circuit 148, respectively. Is done. The second terminals of the first circulator 71 and the third circulator 91 are coupled to the first transmitting / receiving antenna 70 and the third transmitting / receiving antenna 90, respectively. The output of the second receiving antenna 150 is amplified by the second low noise amplifier 151, and then multiplied by the output of the local transmission circuit 149 that generates a signal having the same frequency as the carrier frequency by the second receiving multiplier 152. The output is input to the second buffer amplifier 154 via the second band pass filter 153, and the output is sequentially delayed by the plurality of second delay units 155 and input to the digital signal processing circuit 148. As shown in the figure, each unit is formed in the digital rotational polarization transmitting / receiving module 210. According to the present embodiment, the same function as the radio of the embodiment of FIG. 1 can be realized by three antennas, and the generation of the input signal to the power amplifier and the processing of the output signal of the low noise amplifier are all realized by a digital circuit. As a result, the size of the wireless device can be reduced, the manufacturing cost of the wireless device can be reduced, and the life of the wireless device can be increased.

D. Application to other systems

In the present embodiment, another configuration example of a wireless system in which a transceiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths will be described with reference to FIG.
FIG. 11 is an example of a configuration diagram of an elevator system to which a wireless system in which a transmitter / receiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths is applied. In the elevator system 1100 of the present embodiment, the elevator cage 1111 moves up and down in the building 1101 where the elevator is installed. A base station radio 1102 and a base station 2 orthogonal polarization integrated antenna 1103 are coupled and installed on the floor and ceiling of the building 1101. A terminal radio 1113 is installed on the external ceiling and the external floor of the elevator 1111, and an orthogonal polarization integrated antenna 1112 is coupled using a high frequency cable 1114. The base station radio 1102 and the terminal radio 1113 each detect a channel modification act from an external party and compensate for the degradation in communication quality between transmission and reception for the modification as in the first to tenth embodiments. And a receiver. Since the base station radio 1103 and the terminal station radio 1113 use the inside of the building 1101 as a radio transmission medium, electromagnetic waves are subjected to multiple reflections by the inner wall of the building 1101 and the outer wall of the elevator, and a multiwave interference environment is formed. The In the present embodiment, it is possible to realize high-quality wireless transmission that detects a channel modification act from an external party in a multiwave interference environment and compensates for a decrease in communication quality between transmission and reception for the modification. Since the elevator 1111 can be controlled and monitored remotely from the building 1101 without using the wired connection means using the wireless connection means using the same wireless device, the wired connection means such as a cable can be deleted. In the present embodiment, the same transportation capacity can be realized with a smaller building volume, or the transportation capacity can be improved by increasing the elevator size with the same building volume.

In the present embodiment, another configuration example of a wireless system in which a transmitter / receiver selectively uses a plurality of rotational polarization propagation paths using rotational polarization will be described with reference to FIG.
FIG. 12 is an example of a configuration diagram of a substation equipment monitoring system to which a wireless system in which a transceiver uses rotational polarization and selectively uses a plurality of rotational polarization propagation paths is applied. In the substation equipment monitoring system 1200 of the present embodiment, a plurality of substations 1201 and a substation 1201 are connected to a terminal station radio 1203 and a terminal station polarization antenna 1202. As in the first to tenth embodiments, the terminal station radio 1203 includes a transmitter and a receiver of a radio communication system that uses an electromagnetic wave having a rotationally polarized wave that includes an antenna capable of transmitting and receiving the rotationally polarized wave. In the vicinity of the plurality of substations 1201, a plurality of base station apparatuses 1211 having a number smaller than the number of substations 1201 are installed.
In the base station apparatus 1211, as in the first to tenth embodiments, a base station radio 1213 using a rotationally polarized electromagnetic wave having an antenna capable of transmitting and receiving rotationally polarized waves and a base station rotationally polarized antenna 1212 are coupled. Installed. The dimensions of the transformer are, for example, on the order of several meters and are overwhelmingly larger than the wavelengths corresponding to several hundred MHz to several GHz, which are the frequencies of the electromagnetic waves used by the radio equipment. A multiple wave interference environment is formed due to multiple reflections. In this embodiment, it is possible to realize high-quality wireless transmission that compensates for deterioration in communication quality between transmission and reception using a plurality of reflected waves in a multi-wave interference environment. Then, using the wireless connection means using the same wireless device, the control and monitoring of the transformer 1201 can be performed remotely by the plurality of wireless base stations 1211 without using the wired connection means. Further, in this embodiment, the influence of the high-voltage induced power that becomes a problem when the wired connection means such as a cable is used can be solved, and the installation cost of the cable can be eliminated. It is effective in improving the performance and reducing the cost.

D. Configuration example
This invention and / or a present Example can be provided like the following structural examples, for example.

(Configuration example 1)
A transmitter superimposes a signal obtained by multiplying an electromagnetic wave whose polarization is rotated at a frequency lower than that of a carrier wave by a cyclic code having the same period as the rotation period, and a receiver transmits a cyclic code used by the transmitter. A wireless communication system, wherein the same code is used to know the direction of polarization used by the transmitter, and the transmission information is reproduced using a received signal at a specific time using information in the same direction.
(Configuration example 2)
The wireless communication system according to Configuration Example 1, wherein the wireless devices share a plurality of different cyclic codes and use different cyclic codes at different timings.
(Configuration example 3)
In the wireless communication system according to Configuration Example 1 or 2, the wireless devices share a synchronization code, transmit the synchronization code as a signal at a timing different from the timing using the cyclic code, and synchronize with a plurality of wireless devices A wireless communication system.
(Configuration example 4)
The wireless communication system according to any one of Configuration Examples 1 to 3, wherein the wireless device includes a log memory, and the receiver is parallel to three axes orthogonal to each other using antennas having sensitivity in all directions in the three-dimensional space. Obtain three polarization signals individually, extract the spatial vector sum of the three signals, store the information of the spatial vector sum in the log memory in time series, and use the information in the log memory A wireless communication system characterized by recognizing a change in a wireless environment surrounding a machine.

(Configuration example 5)
The wireless communication system according to any one of the configuration examples 1 to 4, wherein the transmitter uses a total of four types of circuits, ie, a cosine generating circuit and a sine wave generating circuit having two different frequencies, and is half the difference between the two frequencies. A radio communication system characterized by generating a radio wave whose polarization is rotated.
(Configuration example 6)
The wireless communication system according to any one of Configuration Examples 1 to 5, wherein the wireless device includes three spatially orthogonal antennas having sensitivity to an electric field, and the receiver individually processes outputs from the three antennas. A wireless communication system comprising a circuit group and a digital signal processing unit that integrally processes outputs of the circuit group.
(Configuration example 7)
The wireless communication system according to any one of Configuration Examples 1 to 6, wherein the wireless device includes a third antenna having sensitivity to a magnetic field in a plane stretched by the same antenna and two spatially orthogonal antennas having sensitivity to an electric field. The receiver includes three circuit groups that individually process outputs from the three antennas, and a digital signal processing unit that integrally processes the outputs of the circuit groups. Wireless communication system.

(Configuration example 8)
An elevator control system to which the wireless communication system according to any one of Configuration Examples 1 to 7 is applied.
(Configuration example 9)
A substation control system to which any one of the configuration examples 1 to 7 is applied.

E. Appendix
In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 1 ... Information signal generator 3 ... Cosine rotation frequency generation circuit 5 ... Cosine X-axis weighting circuit 6 ... Sine X-axis weighting circuit 10 ... First transmission antenna 11 ... Cyclic code generation circuit 13 ... Sine rotation frequency generation circuit 15 ... Cosine Y-axis weighting circuit 16 ... sine Y-axis weighting circuit 20 ... second transmitting antenna 25 ... cosine Z-axis weighting circuit 26 ... sine Z-axis weighting circuit 30 ... third receiving antenna 39 ... carrier frequency generating circuit

Claims

A wireless communication system,
The transmitter transmits information using a radio wave whose polarization is different from the frequency of the carrier wave and whose polarization is lower than that of the carrier wave.
The receiver
Using three antennas to receive an incoming wave of polarization from multiple directions in three dimensions, obtain three signals of polarization parallel to three axes orthogonal to each other,
Extract the elliptical trajectory including the direction of arrival of the ellipse rotation polarization obtained by three-dimensional synthesis of the incoming wave, the inclination of the major axis, and the ratio of the major axis to the minor axis,
With reference to a table that stores in advance the outputs obtained from the three antennas for the combination of the arrival direction of the circularly polarized waves coming from a plurality of directions in three dimensions and the elliptical trajectory, a finite plurality of the reproducible elliptical trajectories can be reproduced. Find one or more circularly polarized waves that exhibit a unique circular trajectory,
Communicate using a transmission line corresponding to the obtained one or more rotational polarizations,
Wireless communication system.
The wireless communication system according to claim 1, wherein
The receiver
With digital signal processing circuit,
The table includes an arrival direction including an elevation angle Θ and an azimuth angle Φ, an elliptical trajectory including a major axis tilt ψ and a major axis / minor axis ratio ρ, and two antennas orthogonal to each other that receive an incoming wave. The relationship between the long axis inclination Ψ m of the elliptical trajectory of the elliptical polarization and the ratio of the major axis to the minor axis m is stored in advance.
The digital signal processing circuit individually accumulates outputs of three antennas that are spatially orthogonal to each other on a time axis,
The digital signal processing circuit calculates a temporal change in signal strength over one period of rotational polarization for three types of combinations of two orthogonal antennas among the three antennas, and applies each orthogonal two antennas. Calculate the major axis tilt Ψ m and the major axis to minor axis ratio ｍ m (m = 1 to 3) of the elliptical locus of the input rotational polarization,
The digital signal processing circuit calculates, from Ψ m and Ρ m , the inclination ψ ′ m of the major axis of the elliptical locus of the rotational polarization showing the closest value using the table and the ratio Ρ ′ m between the major axis and the minor axis. Seeking
The digital signal processing circuit refers to the table and changes the direction of emitting the rotational polarization of the transmitter on its own side according to Θ and Φ corresponding to Ψ ′ m and Ρ ′ m , and further, Transmits information including Θ and Φ to the radio, and changes the direction of radiating the rotational polarization of the transmitter on the other side by Θ and Φ.
The digital signal processing circuit is configured to obtain Ψ ′ m and Ρ ′ m of the rotational polarization obtained from the table and Ψ m of the rotational polarization obtained from the reception wave with respect to the reception wave in which the direction of radiating the rotational polarization is changed. , [rho when the reduction of the difference is equal to or less than a predetermined threshold value of m, stored theta indicated in the table, the Φ in the internal memory, theta, that communicates with rotating polarization set by Φ A wireless communication system.
The wireless communication system according to claim 2,
The digital signal processing circuit includes:
Set cosine X-axis weighting circuit and sine X-axis weighting circuit to sin ΘcosΦ, cosine Y-axis weighting circuit and sine Y-axis weighting circuit to sin ΘsinΦ, and cosine Z-axis weighting circuit and sine Z-axis weighting circuit to cos Θ, respectively. ,
The transmitter has a circularly polarized wave whose propagation direction coincides with any one direction and has a circular trajectory that rotates at a frequency w, and a polarized wave that has any propagation direction has a circular locus at a frequency w. Radiates rotating rotating polarization into space,
A wireless communication system.
The wireless communication system according to claim 1, wherein
The transmitter of one radio and the receiver of the other radio share the same cyclic code,
The transmitter of one radio transmits a signal obtained by superimposing a signal obtained by multiplying an electromagnetic wave whose polarization is rotated at a frequency lower than that of a carrier wave by a cyclic code having the same period as the rotation period,
The wireless communication system, wherein the receiver of the other wireless device reproduces transmission information using the same code as the cyclic code used by the transmitter.
The wireless communication system according to claim 4, wherein
A wireless communication system, wherein a transmitter of one wireless device and a receiver of the other wireless device share a plurality of different cyclic codes and use different cyclic codes at different timings.
The wireless communication system according to claim 1, wherein
The transmitter of one radio and the receiver of the other radio share the synchronization code, and transmit the synchronization code as a signal at a timing different from the timing using the cyclic code, A radio communication system characterized in that synchronization is achieved with a receiver of the other radio.
The wireless communication system according to claim 1, wherein
The receiver includes a timer, and refers to the table at regular intervals determined by the timer and displays one or more rotational biases that exhibit a finite number of unique circular trajectories that can reproduce the extracted elliptical trajectory. A wireless communication system characterized by calculating a wave.
The wireless communication system according to claim 1, wherein
The receiver includes a log memory, stores information including the arrival direction and elliptic trajectory of the received elliptical rotational polarization in time series in the log memory, and / or the arrival direction and elliptic trajectory from the log memory. A wireless communication system, characterized in that information including: is output to an external device.
The wireless communication system according to claim 1, wherein
A reception antenna changeover switch for switching between the first reception antenna, the second reception antenna, and the third reception antenna;
Or
Comprising first to third circulators or first to third antenna switches respectively connected to the first to third shared antennas;
A wireless communication system.
The wireless communication system according to claim 1, wherein
Two shared antennas and one receiving antenna,
Comprising two circulators connected to the two antennas for transmission and reception;
The transmitter superimposes signals on information using a total of four types of circuits, a cosine generation circuit and a sine wave generation circuit of two different frequencies, and generates a radio wave whose polarization rotates at a frequency half the difference between the two frequencies. A wireless communication system.
The wireless communication system according to claim 1, wherein
Two spatially orthogonal antennas sensitive to the electric field;
A third in-plane antenna having sensitivity to a magnetic field in the plane spanned by the two antennas;
The receiver has three circuit groups that individually process outputs from three antennas, and a digital signal processing unit that processes the outputs of the circuit groups.
A radio,
The transmitter receives information transmitted by using a radio wave whose polarization is different from that of the carrier wave and whose polarization is lower than that of the carrier wave.
Using three antennas to receive an incoming wave of polarization from multiple directions in three dimensions, obtain three signals of polarization parallel to three axes orthogonal to each other,
Extract the elliptical trajectory including the direction of arrival of the ellipse rotation polarization obtained by three-dimensional synthesis of the incoming wave, the inclination of the major axis, and the ratio of the major axis to the minor axis,
With reference to a table that stores in advance the outputs obtained from the three antennas for the combination of the arrival direction of the circularly polarized waves coming from a plurality of directions in three dimensions and the elliptical trajectory, a finite plurality of the reproducible elliptical trajectories can be reproduced. Find one or more circularly polarized waves that exhibit a unique circular trajectory,
Communicate using a transmission line corresponding to the obtained one or more rotational polarizations,
transceiver.
A wireless communication method in a wireless communication system, comprising:
The transmitter transmits information using a radio wave whose polarization is different from the frequency of the carrier wave and whose polarization is lower than that of the carrier wave.
The receiver
Using three antennas to receive an incoming wave of polarization from multiple directions in three dimensions, obtain three signals of polarization parallel to three axes orthogonal to each other,
Extract the elliptical trajectory including the direction of arrival of the ellipse rotation polarization obtained by three-dimensional synthesis of the incoming wave, the inclination of the major axis, and the ratio of the major axis to the minor axis,
With reference to a table that stores in advance the outputs obtained from the three antennas for the combination of the arrival direction of the circularly polarized waves coming from a plurality of directions in three dimensions and the elliptical trajectory, a finite plurality of the reproducible elliptical trajectories can be reproduced. Find one or more circularly polarized waves that exhibit a unique circular trajectory,
Communicate using a transmission line corresponding to the obtained one or more rotational polarizations,
Wireless communication method.
An elevator control system to which the wireless communication system according to claim 1 is applied.
A substation control system to which the wireless communication system according to claim 1 is applied.