WO2013140457A1

WO2013140457A1 - Radio communication system, elevator control system, and electric power transformation equipment control system

Info

Publication number: WO2013140457A1
Application number: PCT/JP2012/001999
Authority: WO
Inventors: 武井　健
Original assignee: 株式会社日立製作所
Priority date: 2012-03-23
Filing date: 2012-03-23
Publication date: 2013-09-26
Also published as: CN104094541A; CN104094541B; IN2014DN07000A; JP5868489B2; JPWO2013140457A1

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

Wireless communication system, elevator control system and transformer control system

The present invention relates to a wireless communication system, an elevator control system, and a transformer control system, and in particular, an environment in which a radio set is located has an obstacle that reflects and scatters radio waves, using multiple waves generated by the obstacle. The present invention relates to a technology for realizing a wireless communication system that performs communication.

Radio communication technology that has made remarkable progress in the field of broadcasting and communication is gradually overcoming the problem of the wireless interruption and non-renewable area in sequence, improving the reliability of the communication line, and significantly improving it compared to telephone conversation and audiovisual communication. We are moving into the field of control and observation where high reliability of communication lines is required. In particular, in social infrastructure devices, the reliability of communication means is higher than that of general consumer devices, but in such fields, adoption of wireless technology as a communication means is being considered.

The environment in which social infrastructure wireless devices are installed is overwhelmingly larger in size compared to consumer devices because the main operation purpose of the wireless devices is control or monitoring of social infrastructure devices. The social infrastructure equipment itself is the source of scattering electromagnetic waves used for wireless communication. In such an environment, as in wireless communication to the broadcast and communication fields, since there is virtually no line-of-sight path or a quasi-line-of-sight path due to diffraction, which is not affected by reflection by electromagnetic wave scatterers It will be performed in the environment where the multiple waves which the reflection by electromagnetic wave scatterer causes mutually interfere.

For this reason, it is a technical issue to realize highly reliable wireless communication under the multiwave interference environment. When the difference in distance from the transmission point to the reception point is an odd multiple of a half wavelength, the energy of the plurality of electromagnetic waves is offset by interference and becomes zero and communication becomes impossible. The prior art for solving this problem is space diversity, and by arranging a plurality of antennas spatially apart by half a wavelength, the point where the electromagnetic wave energy becomes zero from the point where the electromagnetic wave energy becomes zero due to interference of multiple waves. The point is to substitute the point where the energy of the electromagnetic wave is zero by utilizing the property that the multiple waves strengthen each other.

In a social infrastructure wireless communication environment, the distance at which the reflection determined by the relative position of the electromagnetic wave scatterer is caused is the antenna distance for realizing space diversity, ie, the half wavelength of the electromagnetic wave used in wireless communication. When the distance is comparable to the corresponding distance, there is a high possibility that the energy of the electromagnetic wave reaching the antenna may be zero due to interference due to another multiple reflection, and it is difficult to ensure the reliability of the wireless communication.

Here, in order to reduce the radio wave interference as described above in wireless communication, it may be considered to use two orthogonal polarizations. That is, there are two independent polarized waves orthogonal to each other in the electromagnetic wave, and when the electromagnetic wave is reflected by a scatterer such as a social infrastructure device, the direction of the polarized wave changes according to the direction of the polarized wave. Specifically, the polarization perpendicular to the tangent plane of the surface of the scatterer maintains the polarization direction, and the horizontal polarization changes the polarization direction by 180 °. If it is used, there is a possibility that the phenomenon that the electromagnetic wave energy generated by the interference becomes zero can be mitigated.

For example, as a technique for performing communication using orthogonal polarization, in the prior art of Patent Document 1, in the case of performing communication using two electromagnetic waves having orthogonal polarizations, the transmitter has the polarization angles thereof. A technique is disclosed in which the receiver detects the same polarization angle and searches for the polarization angle for performing the best communication to perform communication. Further, in the prior art of Patent Document 2, two orthogonal electromagnetic waves are transmitted from the transmitter, and the receiver divides the incoming electromagnetic waves into two orthogonal polarization components, receives them, and receives them most by the signal processing technology. There is described a technique of synthesizing so as to increase.

Japanese Patent Laid-Open No. 6-311135 Japanese Patent Application Laid-Open No. 60-97734

As described above, as a technique using two orthogonal polarizations, specifically, the direction of a certain polarization is fixed and an electromagnetic wave is transmitted, and the energy of the electromagnetic wave becomes zero due to interference of multiple waves at the reception point. It means that the direction of polarization of the transmitted electromagnetic wave has the same direction of rotation of polarization so that the two electromagnetic waves are offset at the reception point, so the polarization of the electromagnetic wave transmitted in this state is If the direction of the wave is changed, the rotation direction of polarization changes due to the reflection of radio waves on the surface of the scatterer that is the source of multiple wave generation, and the rotation angle of polarization also changes. There are times when the phase rotation angles of the electromagnetic waves are not the same, and it is possible to control the energy of the electromagnetic waves not to be zero at the same reception point due to the independence of the polarization of the electromagnetic waves. Further, since there are a plurality of propagation distances of radio waves at the time of multiple reflections determined by the fixture in the multiple reflection environment, the change in phase angle at the time of multiple reflections caused by electromagnetic wave obstacles by fixtures etc. It depends on the rotation speed of the wave and the same distance.

Here, the prior art of Patent Document 1 is to provide means for performing communication using an optimal polarization angle when the wireless transmission space between the transmitter and the receiver is not an ideal free space. Since the direction of polarization of the electromagnetic wave transmitted from the transmitter to the receiver in wireless communication is constant, an incoming electromagnetic wave at the receiver due to the cancellation of a plurality of multiple reflected waves when there are a plurality of fixtures Can not solve the problem of communication quality deterioration due to the phenomenon of

Further, in the prior art of Patent Document 2, the direction of polarization of the electromagnetic wave transmitted from the transmitter to the receiver in wireless communication is constant, so that multiple multiple reflected waves in the presence of multiple fixtures are mutually different. It is not possible to solve the problem of deterioration of communication quality due to the phenomenon of incoming electromagnetic waves at the receiver due to the cancellation.

That is, in the radio wave environment of a social infrastructure type wireless system, there are a plurality of distances at which reflection determined by the relative position of the fixture as the electromagnetic wave scatterer occurs, and the electromagnetic waves reaching the receiver from the transmitter by these distances are Since interference occurs in different phases, there is a problem that the quality of the radio channel from the transmitter to the receiver is degraded due to their mutual offset.

The problem to be solved by the present invention is high reliability in a social infrastructure system in which a plurality of fixtures are arranged, in which the quality deterioration of the radio circuit from the transmitter to the receiver due to the interference of multiple reflected waves generated by the fixtures is reduced. Providing a wireless communication means of

In order to solve the above problems, for example, the configuration described in the claims is adopted.

Although the present application includes a plurality of means for solving the above problems, one example is a transmitter for transmitting a plurality of carrier waves modulated by an information signal by rotating polarization at different speeds. Receiving the plurality of carriers transmitted by the transmitter, separating each of the plurality of carrier waves at each rotational speed of polarization, demodulating the information signal for each of the separated carriers, and demodulating the information signal for each carrier And a receiver for combining the signals.

According to the present invention, in a social infrastructure system in which a plurality of fixtures are arranged, a highly reliable wireless communication means for reducing the quality deterioration of a wireless circuit from a transmitter to a receiver due to interference of multiple reflected waves generated by the fixtures. Can provide

It is an example of the block diagram of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the radio | wireless communications system which consists of this invention. It is an example of the signal processing part of the receiver of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the radio | wireless communications system which consists of this invention. It is an example of the frequency channel structure of the radio | wireless communications system which consists of this invention. It is an example of the frequency channel other structure of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the radio | wireless communications system which consists of this invention. It is an example of the frequency channel other structure of the radio | wireless communications system which consists of this invention. It is an example of the frequency spectrum of the signal processing part of the receiver of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the radio | wireless communications system which consists of this invention. It is an example of the frequency spectrum of the other signal processing part of the receiver of the radio | wireless communications system which consists of this invention. It is an example of the block diagram of the delta sigma circuit of the receiver of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the delta sigma circuit of the other receiver of the radio | wireless communications system which consists of this invention. It is an example of the other block diagram of the delta sigma circuit of the other receiver of the radio | wireless communications system which consists of this invention. It is an example of the hardware constitutions of the receiver of the radio | wireless communications system which consists of this invention. It is an example of the block diagram of the elevator system to which the radio | wireless communications system which consists of this invention is applied. It is an example of the block diagram of the substation installation monitoring system to which the radio | wireless communications system which consists of this invention is applied.

Examples will be described below with reference to the drawings.

In this embodiment, a configuration example of a wireless device for performing wireless communication of the present invention will be described.

FIG. 1 is an example of the block diagram of the transmitter and receiver which comprise the radio | wireless communications system of a present Example. In the transmitter 1011, a signal having a band of frequency f 1 is generated by the information signal generation circuit 3, the carrier wave generated by the carrier generation circuit 1 is modulated by the signal by the modulator 2, and the modulated signal is branched. Sine waves of different rotation frequencies lower than the frequency of the carrier wave generated by the plurality of rotation signal generation circuits 4 are respectively superimposed by the plurality of transmission mixers 5, and the plurality of signals after superposition are respectively branched into two. The other signals are synthesized by the first transmission synthesis circuit 7 as they are, and the other signals are transmitted through the plurality of transmission delay circuits 6 that generate a delay of 1⁄4 wavelength corresponding to the rotation frequency. The two signals synthesized and combined by the second transmission synthesis circuit 8 are input to each of the two orthogonal antennas constituting the orthogonal vertical polarization transmission antenna 880 and polarized at different rotation frequencies. There is radiated into space as a composite wave of a plurality of rotary polarization rotates.

In the receiver 1012, the signals received as orthogonal polarization components by the orthogonal vertical polarization receiving antenna 881 are branched, one of the plural signals after branching is unchanged, and the other plural signals are at the respective rotation frequencies. Through the plurality of reception delay circuits 19 that generate corresponding quarter wavelength delays, they are respectively combined for each pair by the plurality of reception combining circuits 18 as the plurality of pairs, and the plurality of signals after the combination Is generated by superimposing sine waves of the same frequency as the carrier wave generating circuit 1 included in the transmitter generated by the plurality of first local signal generating circuits 16 by the plurality of first receiving mixers 17, and each signal of the superimposed word The frequency components above the carrier wave frequency are removed by the first reception filter 15, and the signals after removal are provided by a plurality of transmitters generated by the plurality of second local signal generation circuits 13. The sine waves of a plurality of different frequencies identical to the rotation signal generation circuit 4 are superimposed by a plurality of second reception mixers 14, and each signal of the superimposed word is a frequency of the plurality of rotation frequencies or more by a second reception filter 12. An information signal transmitted from the transmitter to the receiver is separated and obtained for each rotation frequency by a carrier wave whose component is removed, and as a result, the polarization is rotated at different rotation frequencies, and each information signal after the separation is a plurality of information signals. The digital signal is converted by the analog-to-digital converter 11 and input to the digital signal processing circuit 10 respectively.

In an environment where many electromagnetic wave scatterers such as fixtures exist in the transmission space where wireless communication is performed, there is usually no electromagnetic wave propagating directly from the transmitter to the receiver, and the electromagnetic waves emitted from the transmitter are generated by the fixtures. The plurality of electromagnetic waves subjected to multiple reflections interfere with each other to reach the receiver. Since the multiple reflected waves suffer a specific phase delay due to the relative position of the cabinet, the multiple reflected waves may cause different phase delays and interfere with each other to arrive at the receiver. If it has a phase relationship that cancels out, the energy of the incoming electromagnetic wave at the receiver decreases, resulting in a decrease in reception sensitivity, and the reliability of wireless communication is degraded. Because the relative position of the fixtures is considered to be fixed during communication, the reliability degradation of the wireless communication is sustained.

When an electromagnetic wave is reflected by an electromagnetic wave scatterer such as a cabinet, the phase change which is affected by the incident angle of the polarization of the electromagnetic wave to the scatterer changes between 0 ° and 180 °. Therefore, by using the electromagnetic waves of rotational polarization, it is possible to change the phase relationship of a plurality of multiple reflected waves arriving at the receiver even if the relative position of the fixture is fixed. In addition, the degree of change in the polarization angle of the electromagnetic wave during reflection in multiple reflection can be changed by changing the rotational speed of the rotational polarization.

According to this embodiment, an electromagnetic wave is transmitted from the transmitter to the receiver using a plurality of carrier waves whose polarizations are rotated at a plurality of different rotational frequencies, and a composite wave of multiple reflections having different properties corresponding to the different rotational frequencies. Since the transmitted information signal can be obtained as a digital signal, these can be combined with high likelihood by ordinary digital signal processing, and the reliability of the communication line in a multiple reflection radio wave environment where direct waves can not be expected can be improved. .

In this embodiment, another configuration example of the radio used in the wireless communication system of this embodiment will be described.

FIG. 2 is an example of a block diagram of a transmitter and a receiver that constitute the wireless communication system in the second embodiment. A different point from the embodiment of FIG. 1 is that circular vertical polarization transmitting antenna 882 and orthogonal vertical polarization receiving antenna 883 are used instead of orthogonal vertical polarization transmitting antenna 880 and orthogonal vertical polarization receiving antenna 881 respectively. is there.

That is, in the present embodiment, the circularly polarized waves having different rotational directions by the circularly vertical polarization transmission antenna 882 are the signal synthesized by the first transmission synthesis circuit 7 and the signal synthesized by the second transmission synthesis circuit 8. Transmit to space by waves. The orthogonal vertical polarization receiving antenna 883 receives circularly polarized light in different rotational directions, and branches the signal for each of the circularly polarized waves received.

As described in the first embodiment, by transmitting the polarized waves orthogonal to each other in the wireless space, it is possible to improve the reliability of the wireless communication. It is also possible to use an electromagnetic wave and an electromagnetic wave of left-handed polarized wave, and the same effect as that of the first embodiment becomes possible by this embodiment.

In general, when manufacturing linear polarized orthogonal antennas of two polarized waves, it is required to arrange them physically exactly at 90 °, and a high precision manufacturing technique is required, which increases the manufacturing cost. It connects. In this embodiment, it is not necessary to secure such an accurate arrangement by arranging two circularly polarized antennas having different rotational directions, and the manufacturing cost can be reduced.

In this embodiment, another configuration example of the radio used in the wireless communication system of this embodiment will be described. FIG. 3 is an example of a block diagram of a transmitter and a receiver that constitute the wireless communication system in the third embodiment.

A different point from the embodiment of FIG. 1 is that the receiver 1032 separates the received signal into orthogonal polarization components by the orthogonal vertical polarization reception antenna 881 and receives it, and one of the separated reception signals is the carrier generation circuit 1 And a first high-cut filter 25 to remove frequency components higher than the carrier frequency by a first high-cut filter 25 to generate a first analog signal. A digital converter 23 converts the signal into a digital signal, and a plurality of first digital filters 21 separate and extract an information signal transmitted by carriers of different rotational frequencies from the signal, and the other of the separated signals is subjected to a second local A transmitter 30, a second receiving mixer 28, a second high cut filter 26, a second analog-to-digital converter 24, a plurality of first Similarly, information signals transmitted by carrier waves of different rotational frequencies can be separated and extracted by the digital filter 22 of the second embodiment, and these can be combined with high likelihood by digital signal processing using these, as in the first embodiment. Can increase the effect of

In this embodiment, the operation of digital signal processing of the receiver used in the wireless communication system of this embodiment will be described. FIG. 4 is an example of the digital signal processing operation of the receiver used in the wireless communication system in the fourth embodiment.

The digital signals of the two systems of information signals obtained when the receiver receives orthogonal polarization separately are sequentially delayed by the plurality of first delay units 41, and the phase change for each delay is changed by the first variable. The other is sequentially delayed by the second delay unit 43, and each delay is combined by the plurality of combiners 44. The second variable phase circuit 45 combines the combined output with the delay compensation. The plurality of signals subjected to phase weighting later and combined by the combining circuit 46 are combined. The synthesized signal is decoded by the demodulation circuit 47 and the control circuit 48 shifts the phase to the plurality of first variable phase circuits 42 and the plurality of second variable phase circuits 45 so that the error rate of the information is minimized. Control the quantity. The information signal thus subjected to a high likelihood of offensive is supplied from the demodulation circuit 47 to the baseband circuit 49.

According to the present embodiment, the digital signal processing can combine information signals transmitted by a plurality of rotational polarizations different in rotational speed with high likelihood by the digital signal processing, so the receiver constituting the wireless communication system of the present invention The sensitivity improvement of the wireless communication system is realized, and the communication reliability of the wireless system is improved.

FIG. 5 is an example of a block diagram of a transmitter and a receiver that constitute the wireless communication system in the fifth embodiment. In the transmitter 1041, a plurality of information signal generation circuits 53 generate a signal of a band of frequency f 1, and modulations of a plurality of carriers generated by a plurality of carrier generation circuits 51 of different frequencies are performed by the plurality of modulators 52 by the signals. Each of the carrier waves serving as a reference and each of the other remaining carrier waves is respectively synthesized by the plurality of synthesis circuits 54, and the plurality of signals after synthesis are respectively branched into two, and the plurality of branched signals are One of them is synthesized as it is by the first transmission synthesis circuit 57, and the other signals are transmitted through the second transmission delay circuit 55 which causes a delay of 1⁄4 wavelength corresponding to the rotation frequency. The two signals synthesized and combined by the transmission combining circuit 56 are input to each of the two orthogonal antennas constituting the orthogonal vertical polarization transmitting antenna 880, and the polarization is rotated at different rotation frequencies. It is radiated into space as a composite wave of a plurality of rotational polarizations.

In the receiver 1042, the signals received as orthogonal polarization components orthogonal to each other by the orthogonal vertical polarization reception antenna 881 are branched, one of the plurality of signals after branching being unchanged, and the other signals being the respective rotation frequencies. Through the plurality of reception delay circuits 66 generating the corresponding quarter wavelength delays, they are respectively combined for each pair by the plurality of reception combining circuits 65 as the plurality of pairs, and the plurality of signals after the combination The plurality of receiving mixers 64 superimposes sine waves generated by a plurality of first local signal generating circuits 63 generating sine waves coincident with different carrier frequencies, and each signal of the superimposed word is received by the receiving filter 62. Frequency components above the carrier frequency are removed, and the removed signal is converted into a digital signal by a plurality of analog-to-digital converters 61 and digital signal processing They are respectively inputted to the road 10.

According to this embodiment, by using carrier waves of different frequencies, electromagnetic waves of different rotational polarizations rotating at half the frequency of the difference between the frequencies of the carrier waves are related to the rotation frequency. It can be realized in the wireless space without using a separate local transmission circuit.

Therefore, even when placed in the receiver, a local transmitter corresponding to the rotational frequency is not necessary. Therefore, the hardware configuration of the transmitter and the receiver can be simplified, the number of parts of the device can be reduced, and the manufacturing cost can be reduced.

FIG. 6 is an example of a block diagram of a transmitter and a receiver that constitute the wireless communication system in the sixth embodiment. The transmitter of this embodiment and the transmitter of the embodiment of FIG. 5 are identical. In the receiver 1052, the signals received as orthogonal polarization components received by the orthogonal vertical polarization reception antenna 881 are branched, and they are divided into a plurality of pairs having the same frequency as the average frequency of a plurality of pairs of carrier waves of the transmitter. Sine waves generated by a plurality of local signal generating circuits 86 generating sine waves are superimposed on each of the pairs by a plurality of pairs of reception mixers 85, and each signal of the pair of superimposed words is paired by a pair of reception filters 83. The frequency components above the carrier frequency are removed, and the removed pair of signals are converted into digital signals by a plurality of pairs of analog-to-digital converters 81 and each input to the digital signal processing circuit 10.

According to this embodiment, the reception delay circuit provided in the receiver of the embodiment of FIG. 5 can be eliminated. The reception delay circuit is an analog element, and in the frequency band of 300 MHz to 3 GHz used for wireless communication, an electrical length of several meters to several tens of centimeters is required, which hinders the realization of downsizing of the device. In the present embodiment, such a delay circuit is not necessary, which is effective in downsizing the receiver.

In the present embodiment, the configuration of a radio channel of an electromagnetic wave used in the wireless communication system of the present embodiment will be described.

FIG. 7 is an example of the configuration of a radio channel of an electromagnetic wave used in the radio communication system in the fifth and sixth embodiments. The radio channel is obtained by dividing the frequency range given to the radio system in advance. The radio channels arranged at equal intervals are arranged one by one, and the frequency of rotational polarization of one channel is realized using the frequency interval of two channels based on the frequency of channel 0. The reason why the adjacent channels are not used in the present embodiment is to suppress the interference of the information signal superimposed on the carrier waves of these adjacent frequencies.

According to the present embodiment, it is possible to realize the wireless system of the present invention by using the normal frequency channel configuration of the existing wireless system, and it is effective to facilitate the market introduction of the wireless system.

In the present embodiment, the configuration of a radio channel of an electromagnetic wave used in the wireless communication system of the present embodiment will be described.
FIG. 8 is an example of another configuration of a radio channel of an electromagnetic wave used in the radio communication system in the fifth and sixth embodiments. The radio channel is obtained by dividing the frequency range given to the radio system in advance. The radio channel of FIG. 8 is a configuration example of a radio channel used in the radio communication system of the embodiment of FIGS. 5 and 6. One or more radio channels arranged at equal intervals are spaced apart, and other frequency channels are arranged up and down with the frequency of channel 0 as a reference, and one channel's worth of channel spacing is used Realize the frequency of rotational polarization. The reason why the adjacent channels are not used in the present embodiment is to suppress the interference of the information signal superimposed on the carrier waves of these adjacent frequencies.

In this embodiment, since the average frequency of two carriers corresponding to the frequency of the rotational polarization can be limited to a narrow range as compared with the embodiment of FIG. 7, the configuration of the local signal generation circuit of the receiver can be simplified. It is effective to miniaturize the receiver and reduce the manufacturing cost.

FIG. 9 is an example of a block diagram of a transmitter and a receiver that constitute the wireless communication system in the ninth embodiment. In the transmitter 1061, a plurality of information signal generation circuits 95 generate a signal of a band of frequency f 1, and a plurality of carriers generated by a plurality of pairs of

carrier generation circuits

91 and 92 of different frequencies are converted by a plurality of modulators 93 by a plurality of modulators 93. The carrier waves modulated with the signal and subjected to each pair of modulations are respectively combined by a plurality of combining circuits 96, the plurality of combined signals are respectively branched into two, and one of the plurality of branched signals is A second transmission combining circuit 98 is combined by one transmission combining circuit 99 and a plurality of other signals via a plurality of transmission delay circuits 97 that cause a delay of 1⁄4 wavelength corresponding to the rotation frequency. And the combined two signals are input to each of the two orthogonal antennas that make up the orthogonal vertical polarization transmission antenna 880, and the polarization is rotated at different rotation frequencies in multiple times. It is radiated into space as a synthetic wave polarization. The average frequency of the pair of two carriers is made to be the same.

In the receiver 1062, the signals received as orthogonal polarization components by the orthogonal vertical polarization reception antenna 881 are orthogonalized by the first delta sigma modulator 101 and the second delta sigma modulator 102 operated by the clock circuit 103. The digital signal is converted into a digital signal and input to the digital signal processing circuit 100. Since the delta sigma circuit enables the pair of two carriers to extract half the frequency component of the frequency of the difference between the two carriers by the sampling frequency of half the average frequency, the average of each pair of two carriers is averaged. By making the frequencies the same, it is possible to obtain a plurality of frequencies corresponding to the plurality of rotational polarization frequencies with one sampling frequency.

Furthermore, by making the average frequency of the pair of two carriers corresponding to the rotational frequency the same, the configuration of the receiver can be greatly simplified, which is effective in reducing the manufacturing cost of the receiver.

In the present embodiment, another configuration of a radio channel of an electromagnetic wave used in the wireless communication system of the present embodiment will be described.
FIG. 10 is an example of the configuration of a radio channel of an electromagnetic wave used for the radio communication system in the ninth embodiment. The radio channel is obtained by dividing the frequency range given to the radio system in advance. The radio channel of FIG. 10 is a configuration example of a radio channel used in the radio communication system of the embodiment of FIG. Plural pairs of radio channels are arranged at different intervals to the left and right with reference to the same center frequency fc. The reason why the adjacent channels are not used in the present embodiment is to suppress the interference of the information signal superimposed on the carrier waves of these adjacent frequencies.

In this embodiment, an example of the frequency spectrum of the receiver of the wireless device used in the wireless communication system of this embodiment will be described.
FIG. 11 is an example of a block diagram of a radio of the frequency spectrum of the receiver of the radio used in the radio communication system in the ninth embodiment. In the receiver used in the wireless communication system of FIG. 9, a plurality of carrier frequency pairs having a plurality of average frequencies fc are formed around the sampling frequency fc of the delta sigma circuit, and fc is set to a basic period by sampling operation. A periodic frequency spectrum is generated, resulting in the frequency of the difference between the pair of carriers.

According to this embodiment, since the sampling frequency of the analog signal processing circuit of the receiver can be fixed, there is no need to separately install a complex frequency variable circuit such as a frequency synthesizer in the receiver, and the receiver can be miniaturized. It is effective to reduce the manufacturing cost.

In the present embodiment, another configuration example of a receiver used in the wireless communication system of the present embodiment will be described.

FIG. 12 is an example of another configuration diagram of a receiver configuring the wireless communication system in the ninth embodiment. At the receiver 1072, the signals received as orthogonal polarization components by the orthogonal vertical polarization reception antenna 881 are orthogonalized by the first delta sigma modulator 101 and the second delta sigma modulator 102 operated by the clock circuit 104. The digital signal is converted into a digital signal and input to the digital signal processing circuit 100. The clock circuit 104 is characterized in that it has a lower frequency than the clock circuit 103 of the receiver of the embodiment of FIG. The delta sigma circuit allows the pair of two carriers to extract a half frequency component of the frequency of the difference between the two carriers by a sampling frequency that is an integral number of half of the average frequency. By making the average frequency of the pair of two carriers the same, it is possible to obtain a plurality of frequencies corresponding to the plurality of rotational polarization frequencies at one sampling frequency.

According to this embodiment, since the sampling frequency of the receiver constituting the wireless communication system according to the present invention can be reduced, the miniaturization and cost reduction of the circuit generating the sampling frequency can be realized, and as a result, the configuration of the receiver Can be greatly simplified, which is effective in reducing the manufacturing cost of the receiver.

In this embodiment, an example of the frequency spectrum of the receiver of the wireless device used in the wireless communication system of this embodiment will be described.
FIG. 13 is an example of a block diagram of a radio of the frequency spectrum of the receiver of the radio used in the radio communication system in the twelfth embodiment. In the receiver used in the wireless communication system of FIG. 9, a plurality of carrier frequency pairs are formed, with a plurality of average frequencies M * fc centered on an integer multiple M * fc of the sampling frequency fc of the delta sigma circuit, and sampling The operation produces a periodic frequency spectrum with M * fc as the fundamental period, resulting in the frequency of the difference between the pair of carriers.

According to this embodiment, since the sampling frequency of the analog signal processing circuit of the receiver can be fixed and the sampling frequency can be lowered, the sampling frequency generation circuit can be simplified, and the receiver can be miniaturized and the manufacturing cost can be reduced. There is.

In this embodiment, a configuration example of a delta sigma circuit used in a receiver used in the wireless communication system of this embodiment will be described.

FIG. 14 is an example of the block diagram of the delta sigma circuit of the receiver which comprises the radio | wireless communications system in Example 9 and 12. FIG. In the delta sigma circuit 1101, the signal obtained by the orthogonal vertical polarization receiving antenna 881 is added to the main path of the feedback circuit formed by the combiner 126 by the first analog resonant circuit 121, the analog digital converter 123, and the post comparator A sampling circuit (not shown) to be realized is arranged, a digital-to-analog converter 124 and a second analog resonant circuit 122 are arranged in the feedback path, the input of the first analog resonant circuit 121 being at the output of the combiner 126 Coupled, the output of the second analog resonant circuit 122 and the input of this delta sigma circuit become the input of the synthesizer 126. The clock circuit 125 supplies a clock to the analog-to-digital converter 123, the digital-to-analog converter 124 and the sampling circuit. The analog-to-digital converter 123 and the digital-to-analog converter 124 are 1-bit type. The first analog resonant circuit 121 is designed to resonate in the input signal band to perform noise shaving in the input signal band, and the second analog resonant circuit 124 is a sinc function caused by the zero hold effect of the digital analog conversion circuit. It is designed to compensate for waveform distortion of the feedback signal of the type in the input signal band.

According to this embodiment, the delta sigma circuit can be realized by the analog resonance circuit, the comparator, the 1-bit analog-to-digital converter 123, the 1-bit digital-to-analog converter 124, and the clock circuit 125 which is a fixed frequency transmission circuit. It is effective to reduce the manufacturing cost of the receiver by simplifying the

In this embodiment, another configuration example of the delta sigma circuit used in the receiver used in the wireless communication system of this embodiment will be described. FIG. 15 is an example of the block diagram of the delta sigma circuit of the receiver which comprises the radio | wireless communications system in Example 9 and 12. FIG.

In the delta sigma circuit 1102, the signal obtained by the orthogonal vertical polarization receiving antenna 881 is realized in the main path of the feedback circuit formed by the synthesizer 126 by the analog resonant circuit 121, the analog digital converter 123, and the post comparator. A sampling circuit (not shown) is disposed, a digital interpolation circuit 127 and a digital-to-analog converter 124 are disposed in the feedback path, the input of the analog resonant circuit 121 is coupled to the output of the synthesizer 126, and the digital-to-analog converter 124 is The output and the input of this delta sigma circuit become the input of the synthesizer 126. The clock circuit 125 supplies a clock to the analog-to-digital converter 123, the digital-to-analog converter 126, and the sampling circuit. The analog-to-digital converter 123 and the digital-to-analog converter 124 are 1-bit type. The analog resonant circuit 121 is designed to resonate in the input signal band to perform noise shaving in the input signal band.

According to this embodiment, compared to the embodiment of FIG. 14, the number of analog circuits can be reduced and, instead, digital circuit elements are increased. The actual state of the digital circuit element is the built-in software of the digital signal processing circuit, and does not lead to an increase in the number of part numbers substantially, and as a result, the simplification of the delta sigma circuit is effective in reducing the manufacturing cost of the receiver.

In this embodiment, another configuration example of the delta sigma circuit used in the receiver used in the wireless communication system of this embodiment will be described. FIG. 16 is an example of the block diagram of the delta sigma circuit of the receiver which comprises the radio | wireless communications system in Example 9 and 12. FIG.

In the delta sigma circuit 1103, the signal obtained by the orthogonal vertical polarization receiving antenna 881 is combined with the first analog resonant circuit 221 and the second analog resonance in the main path of the feedforward feedback circuit formed by the

combiners

237, 238 and 239. A sampling circuit (not shown) realized by the circuit 222, an analog digital converter 223 and a post-stage comparator, a digital interpolation circuit 227 and a digital analog converter 224 in the feedback path, and a delta sigma circuit The input signal is branched into three, and the signal after each branch is coupled to the input of the

combiners

237, 238 and 239 via feed forward

multiplier circuits

231, 232 and 233, respectively. First and second analog resonant circuits 226 and 237 are respectively inserted between the output of combiner 237 and the input of combiner 238 and the output of combiner 238 and the input of combiner 239. The output of analog to digital converter 223 coupled to the output of combiner 239 is coupled to the input of digital to analog converter 224 via digital interpolator 227. The output of digital to analog converter 224 is trifurcated, and the signal after each branch is coupled to the input of

combiners

237, 238 and 239, respectively, via

feedback multiplier circuits

234, 235 and 236, respectively. The clock circuit 228 supplies a clock to the analog-to-digital converter 223, the digital-to-analog converter 224 and the sampling circuit. The analog-to-digital converter 223 and the digital-to-analog converter 224 are 1-bit type. The analog

resonant circuits

221 and 222 are designed to resonate in the input signal band to perform noise shaving in the input signal band.

According to this embodiment, the phase and amplitude of each part of the delta sigma circuit can be adjusted by the multiplier values of the

feedback multiplier circuits

234, 235 and 236 and the

feedforward multiplier circuits

231, 232 and 233, as compared with the embodiment of FIG. Design flexibility of the circuit is improved.

In this embodiment, the hardware configuration of a receiver used in the wireless communication system of this embodiment will be described.

FIG. 17 is another example of a hardware configuration of a receiver used for the wireless communication system in the ninth and twelfth embodiments. FIG. 17 is an example of mounting the receiver used in the wireless communication system of FIGS. 9 and 12 on a printed circuit board. The power supply circuit 244, the high frequency connector 241, and the digital signal connector 242 are mounted on the multilayer printed circuit board 243, and the functional element block to which the same symbol as FIG. 16 is given is electrically connected by the analog signal line 245 and the digital signal line 246. Join together. A direct current generated in the power supply circuit is supplied to the active element of the functional element block through a through hole or the like by a power supply line provided in the inner layer of the multilayer printed circuit board 243. A ground plane for the analog signal line 245 and the digital signal line 246 is formed in the inner layer of the multilayer printed circuit board 243, and a strip line is formed by the ground plane and these signal lines to form a signal transmission path.

The receiver 200 of the printed circuit board on which the parts are mounted is provided with a high frequency connector 241 as an input end of the reception wave, and a digital signal connector 242 as an output end of the digital signal, and the delta sigma modulator of the embodiment of FIGS. The output point is realized.

According to the present embodiment, the mass production of the receiver 200 is possible using the printed circuit board process and the automatic surface mounting process of parts, which is effective in reducing the production cost of the wireless device used in the wireless communication system of the present invention. .

In the present embodiment, a configuration example of a wireless communication system of the present invention will be described.

FIG. 18 is an example of a configuration diagram of an elevator system to which the wireless system of this embodiment is applied. In the elevator system 300 of the present embodiment, the elevator car 311 ascends and descends in the building 301 where the elevator is installed. A base station radio 302 having a polarization angle division diversity function and a base station 2 orthogonal polarization integrated antenna 303 are coupled and installed on a floor portion and a ceiling portion inside the building 301. A terminal station 2 orthogonal polarization integrated antenna 312 is installed on the outside ceiling and outside floor surface of the elevator car 311, and is connected to the terminal radio 313 using a high frequency cable 314. Since the base station radio 303 and the terminal station radio 313 use the inside of the building 301 as a wireless transmission medium, the inner wall of the building 301 and the outer wall of the elevator receive multiple reflections to form a multiwave interference environment. Ru.

In this embodiment, high-quality wireless transmission can be realized even in a multiwave interference environment by polarization angle division diversity, so control and monitoring of the elevator 311 can be performed using a wireless connection means using the same wireless device. Since it can be carried out remotely without using wire connection means from 301, the wire connection means such as cables can be eliminated, the same transport capacity can be realized in a smaller building volume, or the elevator size can be increased in the same building volume Transport capacity improvement can be realized.

In this embodiment, another configuration example of the wireless communication system of the present invention will be described.

FIG. 19 is an example of a configuration diagram of a transformation equipment monitoring system to which the wireless communication system of the present embodiment is applied. In the substation monitoring system 400 of this embodiment, a plurality of substations 401 and the same substation 401 are provided with a terminal station radio 403 for performing polarization angle division diversity and a terminal station 2 orthogonal polarization integrated antenna 402 coupled A plurality of base station apparatuses 411 smaller in number than the number of the transformers 401 are installed in the vicinity of the plurality of transformers 401, and the base station apparatus 411 performs the polarization angle division diversity according to the present invention. The unit 413 and the base station 2 orthogonal polarization integrated antenna 412 are coupled and installed. The dimensions of the transformer are on the order of several meters and are overwhelmingly larger than the wavelength corresponding to several hundred MHz to several GHz, which is the frequency of the electromagnetic wave used by the radio. To form a multi-wave interference environment.

In this embodiment, high-quality wireless transmission can be realized even in a multiple wave interference environment by polarization angle division diversity, so control and monitoring of the transformer 401 can be performed using wireless connection means using the same wireless device. As it can be implemented remotely by a plurality of wireless base stations 411 without using a wired connection means, the problem of high voltage inductive power which becomes a problem when using the wired connection means such as a cable can be solved, and the cost for laying the cable is eliminated. As a result, the safety and cost reduction of the control and monitoring system of the transformer 401 can be achieved.

As described above, according to the present invention, deterioration in communication quality due to interference is resolved by utilizing the property that the respective rotation angles of the polarized waves of the electromagnetic waves are determined by the respective incident angles of the electromagnetic waves entering the scatterer. That is, since multiple waves are components of a plurality of waves reflected by the scatterer, the rotation angles of polarization of the multiple waves are different, and by controlling the different rotation angles, interference of these multiple waves is caused by interference It is possible to avoid the phenomenon that the generated electromagnetic wave energy becomes zero.

That is, when the wavelength corresponding to the frequency of polarization rotation is different, the individual phase differences of the multiple reflected waves are also different, and the combined wave of the received multiple waves is different. Therefore, since the receiver can equivalently obtain electromagnetic waves having a plurality of different characteristics for different polarization rotation speeds, the wireless space transmission line from the transmitter to the receiver is multiplexed, and the communication reliability can be obtained. The multiwave interference environment according to the present invention is realized to improve the degree of reliability and to suppress the decrease in the reliability of wireless communication caused by the loss of electromagnetic wave energy at a receiving point caused by multiwave interference in an environment where multiple electromagnetic wave scatterers exist. It is possible to provide a wireless device capable of improving the communication reliability under it, and to realize a wireless communication system using the same system.

1, 51, 71, 91, 92 Carrier wave generation circuit 2, 52, 72, 93 Modulator 3, 53 Information signal generation circuit 4 Transmission mixer 5 Rotation signal generation circuit 6, 55, 75, 97 Transmission delay circuit 7, 8, 46, 56, 57, 76, 77, 98, 99 Synthesizing circuit 10, 100 Digital signal processing circuit 11, 23, 24, 61, 81, 123, 223 Analog-to-digital converter 12 Low-pass filter 13, 16, 27, 30, 63, 86 Local oscillator 14, 17, 64, 85 Reception mixer 15, 25, 26, 62, 83 High cut filter 18, 44, 54, 65, 74, 96, 126, 237, 238, 239 Synthesizer 19 Reception delay circuit 21 and 22 digital filter 28 and 29 mixer 41 and 43 delay device 42 and 45 variable phase circuit 47 demodulation circuit 48 control circuit 49 Subband circuit 66 Reception delay circuit 73, 95 Information signal generation circuit 101, 102 Delta sigma circuit 103, 104, 125, 128, 228 Clock generation circuit 121, 122, 221, 222 Analog resonant circuit 124, 126, 224 Digital to analog converter 127, 227 Digital Interpolation Circuit 231, 232, 233, 234, 235, 236 Multiplier 300 Elevator System 301 Building 302, 412 Base Station 2 Orthogonal Polarization Integrated Antenna 303, 413 Base Station Radio 311 Lifting Basket 312, 402 Terminal Station 2 orthogonal polarization integrated antenna 313, 403 terminal station radio 400 transformation equipment monitoring system 401 substation 411 radio base station 881 orthogonal vertical polarization transmission antenna 882 orthogonal vertical polarization reception antenna 883, 884 orthogonal circular polarization transmission antenna

Claims

A transmitter for transmitting a plurality of carrier waves modulated by an information signal by rotating the polarization at different speeds respectively;
The plurality of carrier waves transmitted by the transmitter are received, separated for each rotational speed of polarization of each of the plurality of carrier waves, the information signal is demodulated for each separated carrier wave, and the information signal demodulated for each carrier wave And a receiver for combining.
The wireless communication system according to claim 1,
The plurality of carriers transmitted by the transmitter include a plurality of carrier pairs having the same average frequency,
The receiver receives the plurality of carriers transmitted by the transmitter, extracts a plurality of frequency components at a sampling frequency that is an integral part of the average frequency, and is superimposed on the plurality of frequency components. A wireless communication system characterized by weighting and combining information signals.
The wireless communication system according to claim 1,
The transmitter branches a carrier wave modulated by an information signal to generate a plurality of carrier waves, superimposes sine waves of different frequencies on each of the plurality of carrier waves, and generates a plurality of carrier waves on which the sine waves are superimposed. While branching, the phase of the frequency of one of the branched carriers is shifted by a predetermined angle, and the other carrier is crossed with the polarization to be transmitted for transmission.
The receiver has an antenna pair consisting of a first antenna and a second antenna provided so as to cross the angle of the received polarization with the first antenna, and transmitted by the transmitter The plurality of carrier waves are received by the antenna pair, the carrier wave received by the first antenna and the carrier wave received by the second antenna are respectively branched, and using the sine wave superimposed on the branched carrier A radio communication system comprising: demodulation for each carrier wave; and weighting and combining the information signals demodulated for each carrier wave.
The wireless communication system according to claim 1,
The receiver demodulates the demodulated signal using the sine wave superimposed on each of the plurality of received carrier waves, converts the demodulated signal to analog-digital, and converts the analog-digital converted signal to the rotation speed by digital signal processing. A wireless communication system comprising: extracting a plurality of corresponding frequency components; and weighting and combining the information signal superimposed on the plurality of frequency components.
The wireless communication system according to claim 1,
The transmitter modulates an information signal to a plurality of carriers of different frequencies, combines one of the modulated carriers with a reference carrier and a plurality of other carriers, and combines the plurality of carriers. Each of the carriers is branched, the phase of the frequency of one of the branched carriers is shifted by a predetermined angle, and the other carrier is crossed with the polarization to be transmitted for transmission.
The receiver has an antenna pair consisting of a first antenna and a second antenna provided so as to cross the angle of the received polarization with the first antenna, and transmitted by the transmitter The plurality of carrier waves are received by the antenna pair, the received signal is branched, and a delay corresponding to the rotation speed is applied to one of the signals, and one delayed signal and the other signal are combined, A wireless communication system characterized by extracting a plurality of frequency components corresponding to a rotational speed, and weighting and combining the information signal superimposed on the plurality of frequency components.
The wireless communication system according to claim 5,
The wireless communication system according to claim 1, wherein the plurality of carriers transmitted by the transmitter are generated using frequency channels obtained by dividing frequency bands.
The wireless communication system according to claim 6, wherein
The wireless communication system according to claim 1, wherein the frequency channel is formed from a fixed channel of reference and a channel of high or low frequency with respect to the fixed channel.
The wireless communication system according to claim 7,
The wireless communication system, wherein the frequency channel alternately selects a high frequency channel and a low frequency channel for the fixed channel to generate a carrier pair.
The wireless communication system according to claim 2,
In the receiver, the receiver has an antenna pair including a first antenna and a second antenna provided by crossing the angle of polarization received with the first antenna, Receive the plurality of carriers transmitted by the antenna by the antenna pair, respectively branch the carrier received by the first antenna and the carrier received by the second antenna, and branch the branched signals at the same sampling frequency A wireless communication system characterized by using a delta sigma circuit to separate information signals superimposed on different frequency components corresponding to a rotational frequency, and combining them.
The wireless communication system according to claim 9,
The wireless communication system according to claim 1, wherein the plurality of carriers transmitted by the transmitter are generated using frequency channels obtained by dividing frequency bands.
The wireless communication system according to claim 9,
A wireless communication system, wherein the delta sigma circuit uses an analog resonator.
The wireless communication system according to claim 9,
A wireless communication system characterized in that a sampling frequency of the delta sigma circuit is lower than a frequency of the carrier.
The wireless communication system according to claim 9,
A wireless communication system, wherein a sampling frequency of the digital-to-analog converter of the delta sigma circuit is an integral multiple of a sampling frequency of the analog-to-digital converter.
The wireless communication system according to claim 9,
A wireless communication system, wherein said delta sigma circuit comprises a feedback loop and a feed forward loop.
The wireless communication system according to claim 1,
The wireless communication system according to claim 1, wherein the transmitter and the receiver each have an antenna pair whose transmission or reception polarization angle is approximately 90 degrees, and the antenna pair is a linearly polarized antenna.
The wireless communication system according to claim 1,
The wireless communication system according to claim 1, wherein the transmitter and the receiver each have an antenna pair whose transmission or reception polarization angle is approximately 90 degrees, and the antenna pair is a circular polarization antenna.
The wireless communication system according to claim 1,
The wireless communication system, wherein the transmitter and the receiver are manufactured on a multilayer printed circuit board on which a digital signal processing chip is mounted.
An elevator control system to which the wireless communication system according to claim 1 is applied.
A transformer control system to which the wireless communication system according to claim 1 is applied.