JP5868489B2 - Wireless communication system, elevator control system, and substation equipment control system - Google Patents

Description

  The present invention relates to a radio communication system, an elevator control system, and a substation control system, and in particular, an environment in which a radio is placed has an obstacle that reflects and scatters radio waves, and uses multiple waves generated by the obstacle. The present invention relates to a technique for realizing a wireless communication system for performing communication.

  Wireless communication technology, which has made significant progress in the broadcasting and communication fields, is gradually overcoming the problems of wireless fragmentation and non-updatable areas, improving the reliability of communication lines, significantly compared to calling and listening. We are entering the field of control and observation where high reliability of communication lines is required. In particular, in social infrastructure equipment, the reliability of communication means is higher than that of general consumer equipment, but adoption of wireless technology as a communication means is also being considered in such fields.

  In an environment where social infrastructure wireless devices are installed, the main operation purpose of the wireless devices is to control or monitor social infrastructure devices. The social infrastructure equipment itself becomes a source for scattering electromagnetic waves used for wireless communication. In such an environment, there is virtually no line-of-sight path or quasi-line-of-sight path due to diffraction that is not affected by reflections from electromagnetic scattering objects as in wireless communication in the broadcasting / communication field. It is performed in an environment where multiple waves caused by reflection by electromagnetic wave scattering objects interfere with each other.

  For this reason, it is a technical problem to realize highly reliable wireless communication in the multiwave interference environment. When the difference in the 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 canceled by interference and becomes zero, and communication becomes impossible. The conventional technique for solving this problem is space diversity. By installing a plurality of antennas spatially separated by a half wavelength, the electromagnetic wave energy becomes zero due to the interference of multiple waves. The point that the energy of the electromagnetic wave becomes zero is replaced by using the property that the multiple waves strengthen each other.

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

  Here, in order to reduce the above-described radio wave interference in wireless communication, it is conceivable to use two orthogonal polarized waves. That is, the electromagnetic wave has two independent polarized waves, and the direction of the polarization changes depending on the direction of the polarized wave when the electromagnetic wave is reflected by a scatterer such as a social infrastructure device. Specifically, the direction of polarization of polarized waves perpendicular to the tangential plane of the scatterer surface is maintained, and the direction of polarization of horizontal polarized waves changes by 180 °. If used, there is a possibility that the phenomenon that the electromagnetic wave energy generated by interference becomes zero can be alleviated.

  For example, as a technique for performing communication using orthogonal polarized waves, the prior art of Patent Document 1 discloses that when performing communication using two electromagnetic waves having orthogonal polarized waves, the transmitter has their polarization angles. The technique is described in which the receiver detects the same polarization angle, searches for the polarization angle for the best communication, and performs communication. In the prior art of Patent Document 2, two orthogonal electromagnetic waves are transmitted from a transmitter, and the receiver divides the incoming electromagnetic waves into two orthogonal polarization components, receives them, and receives them most by signal processing technology. Describes a technique for synthesizing the composition so as to be high.

JP-A-6-311135 JP-A-60-97734

  As described above, as a technique using two orthogonal polarizations, specifically, the direction of a certain polarization is fixed and electromagnetic waves are transmitted, and the energy of the electromagnetic waves becomes zero due to interference of multiple waves at the reception point. This means that the polarization direction of the transmitted electromagnetic waves has the same rotation direction so that the two electromagnetic waves cancel each other at the receiving point. If the direction of the wave is changed, the rotation direction of the polarization due to the reflection of the radio wave on the surface of the scatterer, which is the source of multiwave generation, and the rotation angle of the polarization also change, so that interference occurs at the reception point. There is a time when the phase rotation angles of the electromagnetic waves do not become the same, and it is possible to control the electromagnetic wave energy so that it does not become zero at the same reception point due to the independence of the polarization of the electromagnetic wave. In addition, since there are a plurality of distances in which the radio wave propagates in the multiple reflection environment determined by the multiple reflections determined by the fixture, the change in the phase angle in the multiple reflections caused by the electromagnetic wave obstruction caused by the fixtures is uneven. It depends on the rotation speed of the wave and the same distance.

  Here, the prior art of Patent Document 1 is providing a 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 electromagnetic waves transmitted from the transmitter to the receiver in wireless communication is constant, the incoming electromagnetic waves at the receiver due to the multiple multiple reflected waves canceling each other when multiple fixtures exist The problem of communication quality degradation due to this phenomenon cannot be solved.

  In the prior art of Patent Document 2, since the polarization direction of electromagnetic waves transmitted from a transmitter to a receiver in wireless communication is constant, a plurality of multiple reflected waves in the presence of a plurality of fixtures are mutually connected. The problem of communication quality degradation due to the phenomenon of incoming electromagnetic waves at the receiver due to cancellation cannot be solved.

  That is, in the radio wave environment of a social infrastructure radio system, there are multiple distances that cause reflection determined by the relative position of the fixture that is the electromagnetic wave scatterer, and the electromagnetic waves that reach the receiver from the transmitter by these distances Since interference occurs at different phases, there is a problem in that the quality of the radio channel from the transmitter to the receiver deteriorates due to the cancellation of each other.

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

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

  The present application includes a plurality of means for solving the above-described problems. For example, a transmitter that transmits a plurality of carrier waves modulated by an information signal while rotating polarizations at different speeds, respectively. , Receiving a plurality of carrier waves transmitted by the transmitter, separating each of the plurality of carrier waves for each rotation speed of polarization, demodulating the information signal for each separated carrier wave, and demodulating the information for each carrier wave A wireless communication system having a receiver for combining signals.

  According to the present invention, in a social infrastructure system in which a plurality of fixtures are arranged, highly reliable radio communication means for reducing quality degradation of a radio channel 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 concerns on 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 concerns on 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 equipment monitoring system to which the radio | wireless communications system which consists of this invention is applied.

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

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

  FIG. 1 is an example of a configuration diagram of a transmitter and a receiver constituting the wireless communication system of the present embodiment. In the transmitter 1011, a signal in the frequency f 1 band is generated by the information signal generation circuit 3, the carrier wave generated by the carrier wave generation circuit 1 is modulated by the modulator 2 using the signal, and the modulated signal is branched. A plurality of transmission mixers 5 superimpose sine waves with different rotational frequencies lower than the frequency of the carrier wave generated by the plurality of rotation signal generation circuits 4, respectively, and the plurality of superimposed signals are each branched into two, One of the signals is synthesized by the first transmission synthesis circuit 7 as it is, and the other plurality of signals are passed through a plurality of transmission delay circuits 6 that produce a delay corresponding to a quarter wavelength corresponding to each rotation frequency. The two signals combined by the second transmission combining circuit 8 are input to each of the two orthogonal antennas constituting the orthogonal vertical polarization transmission antenna 880 and polarized at different rotational frequencies. There is radiated into space as a composite wave of a plurality of rotary polarization rotates.

  In the receiver 1012, the signal received as two orthogonal polarization components by the orthogonal vertical polarization receiving antenna 881 is branched, and one of the plurality of signals after branching is left as it is, and the other signals are set to the respective rotation frequencies. Through a plurality of reception delay circuits 19 that generate delays corresponding to a quarter wavelength, they are synthesized as a plurality of pairs by a plurality of reception synthesis circuits 18 for each pair, and a plurality of combined signals Is a sine wave having the same frequency as that of the carrier wave generation circuit 1 included in the transmitter generated by the plurality of first local signal generation circuits 16 is superimposed by the plurality of first reception mixers 17, and each signal of the superimposed word is The first reception filter 15 removes a frequency component equal to or higher than the carrier frequency, and the signal after the removal includes a plurality of transmitters generated by the plurality of second local signal generation circuits 13. A plurality of different sine waves of the same frequency as the inverted signal generating circuit 4 are superimposed by a plurality of second reception mixers 14, and each signal of the superimposed word is frequency of the plurality of rotation frequencies or more by a second reception filter 12. The information signal transmitted from the transmitter to the receiver by the carrier wave whose polarization is rotated at different rotation frequencies as a result is removed and obtained for each rotation frequency, and each information signal after the separation is a plurality of information signals. It is converted into a digital signal by the analog-digital converter 11 and input to the digital signal processing circuit 10.

  In an environment where there are many electromagnetic scattering objects such as fixtures in a transmission space where wireless communication is performed, there is usually no electromagnetic wave that propagates directly from the transmitter to the receiver, and the electromagnetic waves emitted from the transmitter are generated by the fixture. As a plurality of electromagnetic waves that have received multiple reflections, they interfere with each other and reach the receiver. Since the multiple reflected waves suffer from a specific phase delay due to the relative position of the fixture, the multiple reflected waves have different phase delays and interfere with each other and arrive at the receiver. When the phase relationship cancels out, the energy of the incoming electromagnetic wave at the receiver decreases and the reception sensitivity decreases, and the reliability of wireless communication deteriorates. Since the relative position of the fixture is considered to be fixed during communication, the reliability degradation of the wireless communication is maintained.

  When an electromagnetic wave is reflected by an electromagnetic wave scatterer such as a fixture, the phase change experienced by the incident angle of the polarized wave of the electromagnetic wave on the scatterer varies between 0 ° and 180 °. Therefore, the use of rotationally polarized electromagnetic waves makes it 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 rotation speed of the rotationally polarized wave.

  According to the present embodiment, electromagnetic waves are transmitted from a transmitter to a receiver using a plurality of carrier waves whose polarizations are rotated at a plurality of different rotation frequencies, by a composite wave of multiple reflections having different properties corresponding to the different rotation frequencies. Since transmitted information signals can be obtained as digital signals, they can be combined with high likelihood by ordinary digital signal processing, and the reliability of communication lines in a multiple reflected radio wave environment where direct waves cannot be expected can be improved. .

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

  FIG. 2 is an example of a configuration diagram of a transmitter and a receiver configuring the wireless communication system according to the second embodiment. 1 is different from the embodiment of FIG. 1 in that a circular vertical polarization transmission antenna 882 and an orthogonal vertical polarization reception antenna 883 are used instead of the orthogonal vertical polarization transmission antenna 880 and the orthogonal vertical polarization reception antenna 881, respectively. is there.

  In other words, in the present embodiment, the signals synthesized by the first transmission synthesis circuit 7 and the signals synthesized by the second transmission synthesis circuit 8 are circularly polarized in different rotational directions by the circular vertical polarization transmission antenna 882. Send to space by wave. The orthogonal vertically polarized wave receiving antenna 883 branches the signal for each circularly polarized wave received by receiving circularly polarized waves having different rotation directions.

  As described in the first embodiment, by transmitting polarized waves that are orthogonal to each other in the wireless space, it is possible to improve the reliability of wireless communication. It is possible to use electromagnetic waves and left-handed polarized electromagnetic waves, and this embodiment can achieve the same effects as those of the first embodiment.

  In general, when two orthogonally polarized antennas having linear polarization are manufactured, it is required to physically arrange them at 90 °, which requires a highly accurate manufacturing technique, which increases the manufacturing cost. Connected. In this embodiment, by arranging the two circularly polarized antennas having different rotation directions, it is not necessary to ensure such an accurate arrangement, which is effective in reducing the manufacturing cost.

  In the present embodiment, another configuration example of the wireless device used in the wireless communication system of the present embodiment will be described. FIG. 3 is an example of a configuration diagram of a transmitter and a receiver configuring the wireless communication system according to the third embodiment.

  The receiver 1032 is different from the embodiment of FIG. 1 in that the received signal is separated into orthogonally polarized components by the orthogonal vertical polarization receiving antenna 881 and received, and one of the separated received signals is received by the carrier wave generating circuit 1. The first high-frequency filter 25 multiplies the output of the first local oscillator 27 that generates a sine wave having the same frequency as that of the first reception mixer 29 and removes a frequency component equal to or higher than the carrier frequency. The digital signal is converted into a digital signal by the digital converter 23, and the information signal transmitted by the plurality of first digital filters 21 using the carrier waves having different rotation frequencies is separated and taken out. Transmitter 30, second reception mixer 28, second high-cut filter 26, second analog-digital converter 24, a plurality of second Similarly, the digital filter 22 can separate and extract information signals transmitted by carriers of different rotation frequencies and perform digital signal processing using them to synthesize them with high likelihood. The effect can be improved.

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

  One of the digital signals of the two systems of information signals obtained by the receiver receiving each orthogonal polarization is sequentially delayed by a plurality of first delay devices 41, and the phase change for each delay is the first variable. The other is sequentially delayed by a second delay unit 43, and the other is combined by a plurality of combiners 44 for each delay, and the combined output is delayed by a second variable phase circuit 45. A plurality of signals subjected to phase weighting and synthesized by the synthesis circuit 46 are synthesized. The composite signal is phase-shifted to the plurality of first variable phase circuits 42 and the plurality of second variable phase circuits 45 by the control circuit 48 so that the information is decoded by the demodulation circuit 47 and the error rate of the information is minimized. Control the amount. The information signal that has been attacked with high likelihood is supplied from the demodulation circuit 47 to the baseband circuit 49.

  According to the present embodiment, information signals transmitted by a plurality of rotational polarizations having different rotational speeds can be synthesized with high likelihood by digital signal processing in digital signal processing, so that the receiver constituting the wireless communication system of the present invention The sensitivity is improved, which is effective for improving the communication reliability of the wireless system.

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

  FIG. 5 is an example of a configuration diagram of a transmitter and a receiver configuring the wireless communication system according to the fifth embodiment. In the transmitter 1041, a plurality of information signal generation circuits 53 generate a signal having a frequency f1 band, and a plurality of carrier waves generated by a plurality of carrier wave generation circuits 51 having different frequencies are modulated by the plurality of modulators 52 using the signals. The reference carrier and the other remaining plurality of carriers are respectively combined by the plurality of combining circuits 54, and the combined signals are respectively branched into two, and the plurality of signals after the branching One of the signals is synthesized by the first transmission synthesis circuit 57 as it is, and the other plurality of signals are transmitted through the plurality of transmission delay circuits 55 that generate delays corresponding to the quarter wavelengths corresponding to the respective rotation frequencies. The two signals combined by the transmission combining circuit 56 and combined are input to each of the two orthogonal antennas constituting the orthogonal vertical polarization transmission antenna 880, and the polarization is rotated at different rotational frequencies. It is radiated into space as a composite wave of a plurality of rotational polarizations.

  In the receiver 1042, the signal received as the two orthogonal polarization components by the orthogonal vertical polarization receiving antenna 881 is branched, and one of the plurality of signals after branching is left as it is, and the other signals are set to the respective rotation frequencies. Through a plurality of reception delay circuits 66 that generate a delay corresponding to a quarter wavelength, they are synthesized as a plurality of pairs by a plurality of reception synthesis circuits 65, respectively, and a plurality of signals after synthesis. The sine waves generated by the plurality of first local signal generation circuits 63 that generate sine waves matching the frequencies of different carrier waves are superimposed by a plurality of reception mixers 64, and each signal of the superimposed word is received by a reception filter 62. A frequency component equal to or higher than the carrier frequency is removed, and the signal after the removal is converted into a digital signal by a plurality of analog-digital converters 61 and is subjected to digital signal processing. They are respectively input to the 10.

  According to the present embodiment, a plurality of differently polarized electromagnetic waves rotating at half the frequency difference of the plurality of carrier waves using a plurality of different frequency carriers are related to the rotation frequency. This can be realized in a wireless space without using a separate local transmission circuit.

  This eliminates the need for a local transmitter corresponding to the rotational frequency even when placed in the receiver. 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.

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

  FIG. 6 is an example of a configuration diagram of a transmitter and a receiver configuring the wireless communication system according to the sixth embodiment. The transmitter of this embodiment and the transmitter of the embodiment of FIG. 5 are the same. In the receiver 1052, signals received as two orthogonally polarized components by the orthogonal vertical polarization receiving 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. A sine wave generated by a plurality of local signal generating circuits 86 for generating a sine wave is superimposed on each of the pair by a plurality of pairs of reception mixers 85, and each pair of signals of the superimposed word is paired by a pair of reception filters 83. The frequency components equal to or higher than the carrier frequency are removed, and the pair of signals after the removal are converted into digital signals by a plurality of pairs of analog-digital converters 81 and input to the digital signal processing circuit 10 respectively.

  According to this embodiment, the reception delay circuit provided in the receiver of the embodiment of FIG. 5 can be deleted. 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 device miniaturization. Since this embodiment does not require such a delay circuit, it is effective in reducing the size of the receiver.

  In the present embodiment, the configuration of a radio channel for electromagnetic waves 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 for electromagnetic waves used in the radio communication system in the fifth and sixth embodiments. The radio channel is obtained by dividing a frequency range given to the radio system in advance. The wireless channels arranged at equal intervals are arranged one by one, and the frequency of rotational polarization for one channel is realized using the frequency interval for two channels with reference to the frequency of channel 0. The reason why adjacent channels are not used in this embodiment is to suppress interference of information signals superimposed on these adjacent frequency carriers.

  According to the present embodiment, it is possible to realize the radio system of the present invention by using the normal frequency channel configuration of the existing radio system, and there is an effect of facilitating the market introduction of the radio system.

In the present embodiment, the configuration of a radio channel for electromagnetic waves used in the wireless communication system of the present embodiment will be described.
FIG. 8 is an example of another configuration of an electromagnetic wave radio channel used in the radio communication system according to the fifth and sixth embodiments. The radio channel is obtained by dividing a frequency range given to the radio system in advance. The radio channel in FIG. 8 is an example of the configuration of the radio channel used in the radio communication system of the embodiment in FIGS. One or more radio channels arranged at equal intervals are arranged apart from each other, the other channel is arranged up and down on the basis of the frequency of channel 0, and the frequency interval for two channels is used for one channel. Realize the frequency of rotational polarization. The reason why adjacent channels are not used in this embodiment is to suppress interference of information signals superimposed on these adjacent frequency carriers.

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

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

  FIG. 9 is an example of a configuration diagram of a transmitter and a receiver configuring the wireless communication system according to the ninth embodiment. In the transmitter 1061, a plurality of information signal generation circuits 95 generate a signal in a band of frequency f1, and a plurality of modulators 93 generate a plurality of carriers generated by a plurality of pairs of carrier generation circuits 91 and 92 having different frequencies. The carrier waves modulated by the signals are respectively combined by a plurality of combining circuits 96, and the combined signals are respectively branched into two, and one of the plurality of signals after branching is left as it is. The second transmission synthesis circuit 98 is synthesized through a plurality of transmission delay circuits 97 that are delayed by a quarter wavelength corresponding to each rotation frequency. The combined two signals are input to each of the two orthogonal antennas constituting the orthogonal vertical polarization transmitting antenna 880, and a plurality of times the polarization rotates at different rotational frequencies. It is radiated into space as a synthetic wave polarization. The average frequency of the pair of two carriers is set to be the same.

  In the receiver 1062, signals received as two orthogonal polarization components by the orthogonal vertical polarization receiving antenna 881 are respectively received by the first delta sigma modulator 101 and the second delta sigma modulator 102 operated by the clock circuit 103. It is converted into a digital signal and input to the digital signal processing circuit 100. The delta-sigma circuit can extract a frequency component that is a half of the difference frequency of the two carriers by sampling frequency that is half of the average frequency of the pair of two carriers. By using the same frequency, it is possible to obtain a plurality of frequencies corresponding to a plurality of rotationally polarized frequencies with a single sampling frequency.

  According to the present embodiment, a plurality of differently polarized electromagnetic waves rotating at half the frequency difference of the plurality of carrier waves using a plurality of different frequency carriers are related to the rotation frequency. This can be realized in a wireless space without using a separate local transmission circuit.

  Furthermore, by making the average frequency of a 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 this embodiment, another configuration of a radio channel of electromagnetic waves used in the radio communication system of this embodiment will be described.
FIG. 10 is an example of the configuration of a radio channel for electromagnetic waves used in the radio communication system according to the ninth embodiment. The radio channel is obtained by dividing a frequency range given to the radio system in advance. The radio channel in FIG. 10 is a configuration example of a radio channel used in the radio communication system of the embodiment in FIG. A plurality of pairs of radio channels are arranged at different intervals on the left and right with the same center frequency fc as a reference. The reason why adjacent channels are not used in this embodiment is to suppress interference of information signals superimposed on these adjacent frequency carriers.

  According to the present embodiment, it is possible to realize the radio system of the present invention by using the normal frequency channel configuration of the existing radio system, and there is an effect of facilitating the market introduction of the radio system.

In this embodiment, an example of a frequency spectrum of a radio receiver used in the radio communication system of this embodiment will be described.
FIG. 11 is an example of a configuration diagram of a radio device having a frequency spectrum of a radio receiver used in the radio communication system according to 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 defined as a basic period by the sampling operation. A periodic frequency spectrum is generated, and as a result, a difference frequency between a pair of carrier waves is obtained.

  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 place a complicated frequency variable circuit such as a frequency synthesizer in the receiver, and the receiver can be downsized. Effective in reducing manufacturing costs.

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

  FIG. 12 is an example of another configuration diagram of the receiver configuring the wireless communication system according to the ninth embodiment. In the receiver 1072, signals received as two orthogonal polarization components by the orthogonal vertical polarization receiving antenna 881 are respectively received by the first delta sigma modulator 101 and the second delta sigma modulator 102 operated by the clock circuit 104. It 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 can extract a frequency component that is a half of the difference frequency of the two carrier waves by a sampling frequency that is an integer that is half the average frequency of the pair of two carrier waves. By making the average frequency of a pair of two carrier waves the same, it is possible to obtain a plurality of frequencies corresponding to a plurality of rotationally polarized frequencies with a single sampling frequency.

  According to the present embodiment, the sampling frequency of the receiver constituting the wireless communication system according to the present invention can be reduced, so that the circuit that generates the sampling frequency can be reduced in size and cost. 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 a frequency spectrum of a radio receiver used in the radio communication system of this embodiment will be described.
FIG. 13 is an example of a configuration diagram of a radio device having a frequency spectrum of a radio receiver used in the radio communication system according to the twelfth 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 M * fc are formed around an integer multiple M * fc of the sampling frequency fc of the delta-sigma circuit, and sampling is performed. By operation, a periodic frequency spectrum having a basic period of M * fc is generated, and as a result, a frequency difference between a pair of carriers is obtained.

  According to the present embodiment, the sampling frequency of the analog signal processing circuit of the receiver can be fixed and the sampling frequency can be lowered, so that the sampling frequency generating circuit can be simplified, which is effective for downsizing the receiver and reducing the manufacturing cost. 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 a configuration diagram of a delta-sigma circuit of a receiver configuring the wireless communication system according to the ninth and twelfth embodiments. In the delta sigma circuit 1101, the signal obtained by the orthogonal vertical polarization receiving antenna 881 is sent to the main path of the feedback circuit formed by the synthesizer 126 by the first analog resonance circuit 121, the anacro-digital converter 123, and the rear-end comparator. The realized sampling circuit (not shown) is arranged, the digital-analog converter 124 and the second analog resonance circuit 122 are arranged in the feedback path, and the input of the first analog resonance circuit 121 is used as the output of the synthesizer 126. Then, the output of the second analog resonance circuit 122 and the input of the present delta sigma circuit become the input of the combiner 126. The clock circuit 125 supplies a clock to the analog-digital converter 123, the digital-analog converter 124, and the sampling circuit. The analog-digital converter 123 and the digital-analog converter 124 are 1-bit types. The first analog resonance circuit 121 is designed to resonate in the input signal band in order to perform noise shaving in the input signal band, and the second analog resonance circuit 124 is a sinc function generated by the zero hold effect of the digital-analog conversion circuit. Designed to compensate for the waveform distortion of the type feedback signal in the input signal band.

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

  In the present embodiment, another configuration example of the delta sigma circuit used in the receiver used in the wireless communication system of the present embodiment will be described. FIG. 15 is an example of a configuration diagram of a delta-sigma circuit of a receiver configuring the wireless communication system according to the ninth and twelfth embodiments.

  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 resonance circuit 121, the analog digital converter 123, and the back-end comparator. A sampling circuit (not shown) is arranged, a digital interpolation circuit 127 and a digital / analog converter 124 are arranged in the feedback path, and the input of the analog resonance circuit 121 is coupled to the output of the synthesizer 126, so that the digital / analog converter 124 The output and the input of this delta sigma circuit are the input of the synthesizer 126. The clock circuit 125 supplies a clock to the analog-digital converter 123, the digital-analog converter 126, and the sampling circuit. The analog-digital converter 123 and the digital-analog converter 124 are 1-bit types. The analog resonance circuit 121 is designed to resonate in the input signal band in order to perform noise shaving in the input signal band.

  According to this embodiment, compared with the embodiment of FIG. 14, the analog circuit can be reduced, and the digital circuit elements are increased instead. The actual state of the digital circuit element is software embedded in the digital signal processing circuit, which does not lead to a substantial increase in the number of parts, and as a result, it is effective in reducing the manufacturing cost of the receiver by simplifying the delta-sigma circuit.

  In the present embodiment, another configuration example of the delta sigma circuit used in the receiver used in the wireless communication system of the present embodiment will be described. FIG. 16 is an example of a configuration diagram of a delta-sigma circuit of a receiver that constitutes the wireless communication system according to the ninth and twelfth embodiments.

  In the delta-sigma circuit 1103, the signal obtained by the orthogonal vertical polarization receiving antenna 881 is fed to the main path of the feedforward / feedback circuit formed by the combiners 237, 238 and 239 and the first analog resonance circuit 221 and the second analog resonance. A sampling circuit (not shown) realized by a circuit 222, an analog digital converter 223, and a post-comparison comparator is arranged, a digital interpolation circuit 227 and a digital / analog converter 224 are arranged on the feedback path, and a delta-sigma circuit The input signal is split into three, and the signal after each branch is coupled to the inputs of synthesizers 237, 238, and 239 via feedforward multiplier circuits 231, 232, and 233, respectively. The first and second analog resonance circuits 226 and 237 are inserted between the output of the combiner 237 and the input of the combiner 238 and between the output of the combiner 238 and the input of the combiner 239, respectively. The output of the analog to digital converter 223 coupled to the output of the synthesizer 239 is coupled to the input of the digital to analog converter 224 via the digital interpolator 227. The output of the digital-to-analog converter 224 is branched into three, and the signal after each branch is coupled to the inputs of the synthesizers 237, 238 and 239 via the feedback multiplier circuits 234, 235 and 236, respectively. The clock circuit 228 supplies a clock to the analog-digital converter 223, the digital-analog converter 224, and the sampling circuit. The analog-digital converter 223 and the digital-analog converter 224 are 1-bit types. The analog resonance circuits 221 and 222 are designed to resonate in the input signal band in order 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, compared with the embodiment of FIG. This improves the degree of freedom in circuit design.

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

  FIG. 17 is another example of the hardware configuration of the receiver used in the wireless communication system according to the ninth and twelfth embodiments. FIG. 17 shows an example in which a receiver used in the wireless communication system of FIGS. 9 and 12 is mounted on a printed circuit board. A power supply circuit 244, a high frequency connector 241 and a digital signal connector 242 are mounted on the multilayer printed circuit board 243, and functional element blocks to which the same symbols as those in FIG. 16 are given are electrically connected by analog signal lines 245 and digital signal lines 246. Join. The direct current generated in the power supply circuit is supplied to the active element of the functional element block by using a through hole or the like by a power supply line provided in the inner layer of the multilayer printed 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 printed circuit board receiver 200 on which the components are mounted is provided with a high frequency connector 241 as an input end of a received wave and a digital signal connector 242 as an output end of a digital signal, and the delta sigma modulator of the embodiment of FIGS. An output point is realized.

  According to the present embodiment, the receiver 200 can be mass-produced by using the printed circuit board process and the automatic surface mounting process of components, and it is effective in reducing the production cost of the radio used in the radio communication system of the present invention. .

  In this embodiment, a configuration example of the 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 the present embodiment is applied. In the elevator system 300 according to the present embodiment, the elevator cage 311 moves up and down 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 the floor and ceiling of the building 301. The terminal station 2 orthogonal polarization integrated antenna 312 is installed on the external ceiling and the external floor of the elevator car 311, respectively, and is coupled 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, electromagnetic waves are subjected to multiple reflections by the inner wall of the building 301 and the outer wall of the elevator, and a multiwave interference environment is formed. The

  In this embodiment, the polarization angle division diversity enables high-quality wireless transmission even in a multi-wave interference environment. Therefore, the elevator 311 is controlled and monitored using wireless connection means using the wireless device. Since it can be performed remotely without using wired connection means from 301, the wired connection means such as cables can be deleted, and the same transportation capacity can be realized with a smaller building volume, or the elevator size can be increased with the same building volume. Can improve transportation capacity.

  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 substation equipment monitoring system to which the wireless communication system of the present embodiment is applied. In the substation equipment monitoring system 400 of this embodiment, a plurality of substations 401 and a terminal station radio 403 that performs polarization angle division diversity and a terminal station 2 orthogonal polarization integrated antenna 402 are coupled to the substation 401. A plurality of base station apparatuses 411 smaller than the number of the substations 401 are installed in the vicinity of the plurality of substations 401, and the base station apparatus 411 is a base station radio that performs polarization angle division diversity according to the present invention. Unit 413 and base station 2 orthogonal polarization integrated antenna 412 are connected and installed. The dimensions of the transformer are 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 electromagnetic waves used by the radio. As a result, a multi-wave interference environment is formed.

  In this embodiment, polarization angle division diversity enables high-quality wireless transmission even in a multi-wave interference environment. Therefore, control / monitoring of the substation 401 is performed using wireless connection means using the wireless device. Since a plurality of wireless base stations 411 can be implemented remotely without using wired connection means, it is possible to solve the problem of high-voltage induced power, which is a problem when using the wired connection means such as cables, and eliminate the installation cost of the cables. This is effective in improving the safety and cost of the control / monitoring system of the transformer 401.

  As described above, in the present invention, the deterioration of communication quality due to interference is eliminated by utilizing the property that the rotation angle of the polarization of the electromagnetic wave is determined by the incident angle of the electromagnetic wave incident on the scatterer. In other words, since multiple waves are components of a plurality of waves reflected by a scatterer, the rotation angles of the polarizations of the multiple waves are different from each other. It is possible to avoid the phenomenon that the electromagnetic wave energy generated becomes zero.

  That is, when the wavelength corresponding to the polarization rotation frequency is different, the individual phase differences of the multiple reflected waves are also different, and the composite wave of the received multiplexed waves is different. Therefore, since the receiver can obtain electromagnetic waves having a plurality of different characteristics equivalently for different polarization rotation speeds, the wireless spatial transmission path from the transmitter to the receiver is multiplexed, and communication reliability is improved. The multiwave interference environment that suppresses deterioration in the reliability of wireless communication due to loss of electromagnetic wave energy at the reception point caused by multiwave interference in an environment where a plurality of electromagnetic wave scatterers are present. It is possible to provide a wireless device capable of improving communication reliability under the above, and to realize a wireless communication system using the 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 Synthesizer 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 Receiving 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, 22 Digital filter 28, 29 Mixer 41, 43 Delay device 42, 45 Variable phase circuit 47 Demodulation circuit 48 Control circuit 49 Sband 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 resonance circuit 124, 126, 224 Digital 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 Elevator cage 312, 402 Terminal station Two orthogonally polarized integrated antennas 313 and 403 Terminal station radio 400 Substation equipment monitoring system 401 Substation 411 Radio base station 881 Orthogonal vertically polarized wave transmitting antenna 882 Orthogonal vertically polarized wave receiving antenna 883 and 884 Orthogonal circularly polarized wave transmitting antenna

Claims (16)

A transmitter for transmitting a plurality of carrier waves modulated by an information signal by rotating polarizations at different frequencies ;
The plurality of carrier waves transmitted by the transmitter are received, separated for each rotation frequency of polarization 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 synthesizing
The transmitter modulates the information signal to each of a plurality of carrier pairs having the same average frequency, combines the modulated pair of carriers, branches the plurality of combined carriers, and branches them. Shift the phase of the frequency of one of the carrier waves by a predetermined angle, and transmit the other carrier wave with the polarization to be transmitted,
The receiver receives the plurality of carriers transmitted by the transmitter, extracts a plurality of frequency components at a sampling frequency that is a fraction of the average frequency, and is superimposed on the plurality of frequency components. A wireless communication system characterized by combining information signals by weighting. A transmitter for transmitting a plurality of carrier waves modulated by an information signal by rotating polarizations at different frequencies, and
The plurality of carrier waves transmitted by the transmitter are received, separated for each rotation frequency of polarization 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 synthesizing
The transmitter modulates an information signal into a plurality of carriers having different frequencies, combines a reference carrier and the plurality of other carriers out of the plurality of modulated carriers, and combines the plurality of carriers. Each of the branched carriers is shifted, and the phase of the frequency of one of the branched carriers is shifted by a predetermined angle, and the other carrier and the transmitted polarization are crossed and transmitted,
The receiver has an antenna pair consisting of a first antenna and a second antenna provided so that the angle of the polarization to be received intersects with the first antenna, and is transmitted by the transmitter. Receiving the plurality of carriers by the antenna pair, branching the received signal, applying a delay corresponding to the rotation speed to one signal, combining the delayed one signal and the other signal, A wireless communication system, wherein a plurality of frequency components corresponding to a rotation speed are extracted, and the information signals superimposed on the plurality of frequency components are weighted and synthesized. The wireless communication system according to claim 2 ,
A plurality of carrier waves transmitted by the transmitter are generated using a frequency channel obtained by dividing a frequency band. The wireless communication system according to claim 2 ,
The frequency channel, wireless communication system, characterized in that it is formed from a very high or low frequency of the channel against the standards of the fixed channels and the fixed channels. The wireless communication system according to claim 4 ,
The frequency communication system generates a carrier pair by alternately selecting a high frequency channel and a low frequency channel for the fixed channel. The wireless communication system according to claim 1,
The receiver includes an antenna pair including a first antenna and a second antenna provided so that a polarization angle to be received intersects with the first antenna, and the transmission is performed. The plurality of carrier waves transmitted by the receiver 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 the branched signals are transmitted at the same sampling frequency. A radio communication system characterized in that a delta-sigma circuit is used to separate and weight-synthesize information signals superimposed on different frequency components corresponding to the rotation frequency. The wireless communication system of claim 6 , wherein
A plurality of carrier waves transmitted by the transmitter are generated using a frequency channel obtained by dividing a frequency band. The wireless communication system according to claim 6 ,
A wireless communication system, wherein the delta-sigma circuit uses an analog resonator. The wireless communication system of claim 6 , wherein
A wireless communication system, wherein a sampling frequency of the delta-sigma circuit is lower than a frequency of the carrier wave. The wireless communication system according to claim 6 ,
A wireless communication system, wherein a sampling frequency of the digital-analog converter of the delta-sigma circuit is an integral multiple of a sampling frequency of the analog-digital converter. The wireless communication system according to claim 6 ,
The wireless communication system, wherein the delta-sigma circuit has a feedback loop and a feedforward loop. The wireless communication system according to claim 1,
The wireless communication system, wherein the transmitter and the receiver have an antenna pair whose polarization angle to transmit or receive is approximately 90 °, and the antenna pair is a linearly polarized antenna. The wireless communication system according to claim 1,
The wireless communication system, wherein the transmitter and the receiver have an antenna pair whose polarization angle to transmit or receive is approximately 90 °, and the antenna pair is a circularly polarized antenna. The wireless communication system according to claim 1,
The wireless communication system, wherein the transmitter and the receiver are manufactured by a multilayer printed 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 substation equipment control system to which the wireless communication system according to claim 1 is applied.

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