CN113794665B - System and method for reducing tunnel communication interference - Google Patents
System and method for reducing tunnel communication interference Download PDFInfo
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- CN113794665B CN113794665B CN202111072926.8A CN202111072926A CN113794665B CN 113794665 B CN113794665 B CN 113794665B CN 202111072926 A CN202111072926 A CN 202111072926A CN 113794665 B CN113794665 B CN 113794665B
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- 230000006854 communication Effects 0.000 title claims abstract description 42
- 238000004891 communication Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000007175 bidirectional communication Effects 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 2
- 238000005562 fading Methods 0.000 abstract description 4
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The application provides a system and a method for reducing tunnel communication interference, wherein the system comprises: the antenna system comprises a duplexer, a receiving antenna, a first directional coupler, a second directional coupler, a base station, a signal distributor, a signal combiner, a near-end machine, a first OFDM frequency modulator, a second OFDM frequency modulator, a first OFDM demodulator, a second OFDM demodulator, a plurality of far-end machines, a plurality of transmitting antennas, a main control machine and a power supply, wherein the receiving signal and the transmitting signal can be effectively isolated by arranging the duplexer, the first directional coupler and the second directional coupler, so that mutual interference is prevented; the first OFDM modulator, the first OFDM demodulator, the second OFDM modulator and the second OFDM demodulator can ensure high-speed transmission of signals and reduce interference of multipath fading; and the receiving antenna and the transmitting antenna are also set as directional antennas, so that the signal strength is increased, and the anti-interference capability of the signals is further improved.
Description
Technical Field
The present disclosure relates to the field of tunnel communications technologies, and in particular, to a system and method for reducing interference of tunnel communications.
Background
Along with the development needs of the country, the traffic convenience of people is improved, in some remote mountain areas, tunnel excavation is a necessary choice, and due to the development of networks, the communication technology in the tunnel is also continuously developed and improved, so that people can smoothly communicate with the outside in the tunnel.
However, tunnel communication is limited by its special environment, and communication in the tunnel is often subject to various kinds of interference, such as magnetic field interference, wireless Local Area Network (WLAN) interference, interference caused by antenna distribution on signals of a wireless communication system, and so on.
Accordingly, the present application contemplates a system and method for reducing interference in tunnel communications from various aspects.
Disclosure of Invention
An objective of the embodiments of the present application is to provide a system and a method for reducing interference of tunnel communication, so as to solve the technical problem of interference of tunnel communication. The specific technical scheme is as follows:
in a first aspect, a system for reducing interference in tunnel communications is provided, the system comprising:
the system comprises a duplexer, a receiving antenna, a first directional coupler, a second directional coupler, a base station, a signal distributor, a signal combiner, a near-end machine, a first OFDM modulator, a second OFDM modulator, a first OFDM demodulator, a second OFDM demodulator, a plurality of far-end machines, a plurality of transmitting antennas, a main control machine and a power supply,
the base station is connected with the duplexer in a bidirectional communication way, the duplexer is connected with the receiving antenna, a first directional coupler is connected in series on a downlink channel of the base station and the duplexer, a second directional coupler is connected in series on a downlink channel of the base station and the duplexer, the first directional coupler is connected with the signal distributor, the signal distributor is connected with a signal receiving port of the near-end machine through a downlink communication line, the second directional coupler is connected with the signal combiner, the signal distributor is connected with a signal transmitting port of the near-end machine through an uplink communication line, the near-end machine is connected with the first OFDM modulator and the second OFDM demodulator through optical fibers, the first OFDM modulator is connected with the first OFDM demodulator, the second OFDM modulator is connected with the second OFDM demodulator, the first OFDM demodulator and the second OFDM frequency modulators are connected with a plurality of far-end machines which are uniformly arranged in a tunnel at intervals, each far-end machine is connected with a platy transmitting antenna, the main control machine is respectively connected with the duplexer, the first directional coupler, the second directional coupler, the signal distributor, the signal combiner, the near-end machine, the first OFDM frequency modulator, the first OFDM demodulator, the second OFDM frequency modulator, the second OFDM demodulator and the plurality of far-end machines through control lines, and the power supply is respectively connected with the duplexer, the first directional coupler, the second directional coupler, the signal distributor, the signal combiner, the near-end machines, the first OFDM frequency modulator, the first OFDM demodulator, the second OFDM frequency modulator, the second OFDM demodulator and the plurality of far-end machines through control lines.
Optionally, the system further comprises: an isolation current loop mounted at a communication port of each device.
Optionally, the system further comprises: the interference source detection devices are installed on the inner wall of the tunnel at uniform intervals and are connected with the main control computer.
Optionally, the receiving antenna and the transmitting antenna are directional antennas.
Optionally, a separator is disposed between the control line, the communication line, and the power line.
In a second aspect, the present application provides a method for reducing interference of tunnel communication, the method comprising:
transmitting the base station signal to a signal distributor through a first directional coupler;
the signal distributor distributes the base station signal to a plurality of near-end machines;
each near-end machine transmits the base station signal to a first OFDM modulator through an optical fiber;
the first OFDM frequency modulator converts the base station signals into multiple paths of low-speed carrier signals for transmission, transmits the multiple paths of low-speed carrier signals to a plurality of remote terminals in a tunnel, synthesizes one path of high-speed signals through the first OFDM demodulator and then transmits the one path of high-speed signals to the remote terminals;
the remote machine sends the signal to the corresponding target receiving device.
Optionally, the method further comprises:
transmitting signals of equipment in the tunnel to a second OFDM modulator through a remote terminal;
the second OFDM modulator converts the signals into multipath low-speed carrier signals and transmits the multipath low-speed carrier signals to the second OFDM demodulator at the tunnel portal;
the second OFDM demodulator synthesizes the signals into a high-speed signal and then sends the high-speed signal to the signal combiner through the near-end machine;
the signal combiner transmits the signals in the tunnel to the base station through the second directional coupler.
Optionally, the method further comprises:
detecting an interference signal by an interference source detection device;
transmitting the interference signal to a main control computer, and judging the source of the interference signal by the main control computer;
if the source is from a WLAN signal, the interfering signal is adjusted to the idle channel.
Optionally, the method further comprises:
an isolation current loop is added at the communication port of each device.
The beneficial effects of the embodiment of the application are that:
the embodiment of the application provides a system and a method for reducing tunnel communication interference, which can effectively isolate a received signal and a transmitted signal by arranging a duplexer, a first directional coupler and a second directional coupler so as to prevent mutual interference; the first OFDM modulator, the first OFDM demodulator, the second OFDM modulator and the second OFDM demodulator can ensure high-speed transmission of signals and reduce interference of multipath fading; and the receiving antenna and the transmitting antenna are also set as directional antennas, so that the signal strength is increased, and the anti-interference capability of the signals is further improved.
Of course, not all of the above-described advantages need be achieved simultaneously in practicing any one of the products or methods of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a system for reducing interference of tunnel communication according to an embodiment of the present application.
101, a base station; 102. a first directional coupler; 103. a second directional coupler; 104. a diplexer; 105. a receiving antenna; 106. a signal distributor; 107. a signal combiner; 108. a near-end machine; 109. a first OFDM modulator; 110. a second OFDM modulator; 111. a first OFDM demodulator; 112. a second OFDM demodulator; 113. a remote machine; 114. and a transmitting antenna.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the present application provides a system for reducing interference of tunnel communication, and in the following, with reference to a specific implementation manner, a system for reducing interference of tunnel communication provided in the embodiment of the present application will be described in detail, as shown in fig. 1, where the system includes: a diplexer 104, a receive antenna 105, a first directional coupler 102, a second directional coupler 103, a base station 101, a signal splitter 106, a signal combiner 107, a near-end machine 108, a first OFDM frequency modulator 109, a second OFDM frequency modulator 110, a first OFDM demodulator 111, a second OFDM demodulator 112, a plurality of far-end machines 113, a plurality of transmit antennas 114, a main control machine, and a power supply, wherein,
the base station 101 is connected with the duplexer 104 in a bidirectional communication manner, the duplexer 104 is connected with the receiving antenna 105, a first directional coupler 102 is connected in series on a downlink channel between the base station 101 and the duplexer 104, a second directional coupler 103 is connected in series on a downlink channel between the base station 101 and the duplexer 104, the first directional coupler 102 is connected with the signal distributor 106, the signal distributor 106 is connected with a signal receiving port of the near-end machine 108 through a downlink communication line, the second directional coupler 103 is connected with the signal combiner 107, the signal distributor 106 is connected with a signal transmitting port of the near-end machine 108 through an uplink communication line, the near-end machine 108 is connected with the first OFDM modulator 109 and the second OFDM modulator 112 through optical fibers, the first OFDM modulator 109 is connected with the first OFDM demodulator 111, the second OFDM frequency modulator 110 is connected to the second OFDM demodulator 112, the first OFDM demodulator 111 and the second OFDM frequency modulator 110 are connected to a plurality of remote units 113 uniformly spaced in the tunnel, each remote unit 113 is connected to a plate-shaped transmitting antenna 114, the main control unit is connected to the diplexer 104, the first directional coupler 102, the second directional coupler 103, the signal distributor 106, the signal combiner 107, the near-end unit 108, the first OFDM frequency modulator 109, the first OFDM demodulator 111, the second OFDM frequency modulator 110, the second OFDM demodulator 112, and the plurality of remote units 113 through control lines, and the power supply is connected to the diplexer 104, the first directional coupler 102, the second directional coupler 103, the signal distributor 106, the signal combiner 107, the near-end unit 108, the first OFDM frequency modulator 109, the first OFDM demodulator 111, the second OFDM frequency modulator 110, the second OFDM demodulator 112 through power lines respectively, A plurality of remote machines 113 are connected by control lines.
Optionally, the system further comprises: an isolation current loop mounted at a communication port of each device.
Optionally, the system further comprises: the interference source detection devices are installed on the inner wall of the tunnel at uniform intervals and are connected with the main control computer. In one example, the interferer detection device may employ a spectrometer.
Optionally, the receiving antenna 105 and the transmitting antenna 114 each employ a directional antenna.
Optionally, a separator is disposed between the control line, the communication line, and the power line.
In a second aspect, based on the same inventive concept, the present application provides a method of reducing interference of tunnel communication, the method comprising:
transmitting the base station 101 signal to the signal splitter 106 through the first directional coupler 102;
signal distributor 106 distributes the base station 101 signal to a plurality of near end machines 108;
each near-end machine 108 sends the base station 101 signal to the first OFDM modulator 109 via an optical fiber;
the first OFDM modulator 109 converts the signal of the base station 101 into multiple low-speed carrier signals for transmission, and transmits the multiple low-speed carrier signals to a plurality of remote units 113 in the tunnel, and synthesizes a high-speed signal through the first OFDM demodulator 111 and then sends the high-speed signal to the remote units 113;
in this embodiment of the present application, the first OFDM modulator 109 converts the signal of the base station 101 into multiple low-speed carrier signals for transmission, so that the bandwidth of the signal can be reduced, and if the signal bandwidth is smaller than the coherence bandwidth, the signal transmission process can be considered as no frequency selective fading, that is, multipath fading can be effectively resisted. Meanwhile, in order to transmit data at high speed, a path of high-speed signal is synthesized by the first OFDM demodulator 111 and transmitted to the remote terminal 113.
The remote machine 113 transmits the signal to the corresponding target receiving device.
Optionally, the method further comprises:
transmitting the signal of the device in the tunnel to the second OFDM modulator 110 through the remote terminal 113;
the second OFDM modulator 110 converts the signal into a multi-path low-speed carrier signal and transmits the multi-path low-speed carrier signal to the second OFDM demodulator 112 at the tunnel portal;
the second OFDM demodulator 112 synthesizes the signals into a high-speed signal and sends the high-speed signal to the signal combiner 107 through the near-end machine 108;
the signal combiner 107 transmits the signals in the tunnel to the base station 101 via the second directional coupler 103.
Optionally, the method further comprises:
detecting an interference signal by an interference source detection device;
transmitting the interference signal to a main control computer, and judging the source of the interference signal by the main control computer;
if the source is from a WLAN signal, the interfering signal is adjusted to the idle channel.
In the example of the present application, the WLAN signal may come from a wireless communication device such as a cell phone, tablet, etc. carried by a person in a vehicle in a tunnel.
Optionally, the method further comprises:
an isolation current loop is added at the communication port of each device.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A system for reducing interference in tunnel communications, the system comprising:
the system comprises a duplexer, a receiving antenna, a first directional coupler, a second directional coupler, a base station, a signal distributor, a signal combiner, a near-end machine, a first OFDM modulator, a second OFDM modulator, a first OFDM demodulator, a second OFDM demodulator, a plurality of far-end machines, a plurality of transmitting antennas, a main control machine and a power supply,
the base station is connected with the duplexer in a bidirectional communication way, the duplexer is connected with the receiving antenna, a first directional coupler is connected in series on a downlink channel of the base station and the duplexer, a second directional coupler is connected in series on a downlink channel of the base station and the duplexer, the first directional coupler is connected with the signal distributor, the signal distributor is connected with a signal receiving port of the near-end machine through a downlink communication line, the second directional coupler is connected with the signal combiner, the signal distributor is connected with a signal transmitting port of the near-end machine through an uplink communication line, the near-end machine is connected with the first OFDM modulator and the second OFDM demodulator through optical fibers, the first OFDM modulator is connected with the first OFDM demodulator, the second OFDM modulator is connected with the second OFDM demodulator, the first OFDM demodulator and the second OFDM frequency modulators are connected with a plurality of far-end machines which are uniformly arranged in a tunnel at intervals, each far-end machine is connected with a platy transmitting antenna, the main control machine is respectively connected with the duplexer, the first directional coupler, the second directional coupler, the signal distributor, the signal combiner, the near-end machine, the first OFDM frequency modulator, the first OFDM demodulator, the second OFDM frequency modulator, the second OFDM demodulator and the plurality of far-end machines through control lines, and the power supply is respectively connected with the duplexer, the first directional coupler, the second directional coupler, the signal distributor, the signal combiner, the near-end machines, the first OFDM frequency modulator, the first OFDM demodulator, the second OFDM frequency modulator, the second OFDM demodulator and the plurality of far-end machines through control lines.
2. The system for reducing interference to tunnel communications of claim 1, further comprising: an isolation current loop mounted at a communication port of each device.
3. The system for reducing interference to tunnel communications of claim 1, further comprising: the interference source detection devices are installed on the inner wall of the tunnel at uniform intervals and are connected with the main control computer.
4. The system for reducing interference to tunnel communications according to claim 1, wherein the receive antenna and the transmit antenna each employ a directional antenna.
5. The system for reducing interference to tunnel communication according to claim 1, wherein a separator is provided between the control line, the communication line, and the power line.
6. A method for reducing interference of tunnel communication, which is based on the system for reducing interference of tunnel communication according to any one of claims 1-5, and specifically comprises:
transmitting the base station signal to a signal distributor through a first directional coupler;
the signal distributor distributes the base station signal to a plurality of near-end machines;
each near-end machine transmits the base station signal to a first OFDM modulator through an optical fiber;
the first OFDM frequency modulator converts the base station signals into multiple paths of low-speed carrier signals for transmission, transmits the multiple paths of low-speed carrier signals to a plurality of remote terminals in a tunnel, synthesizes one path of high-speed signals through the first OFDM demodulator and then transmits the one path of high-speed signals to the remote terminals;
the remote machine sends the signal to the corresponding target receiving device.
7. The method of claim 6, wherein the method further comprises:
transmitting signals of equipment in the tunnel to a second OFDM modulator through a remote terminal;
the second OFDM modulator converts the signals into multipath low-speed carrier signals and transmits the multipath low-speed carrier signals to the second OFDM demodulator at the tunnel portal;
the second OFDM demodulator synthesizes the signals into a high-speed signal and then sends the high-speed signal to the signal combiner through the near-end machine;
the signal combiner transmits the signals in the tunnel to the base station through the second directional coupler.
8. The method of claim 6, wherein the method further comprises:
detecting an interference signal by an interference source detection device;
transmitting the interference signal to a main control computer, and judging the source of the interference signal by the main control computer;
if the source is from a WLAN signal, the interfering signal is adjusted to the idle channel.
9. The method of claim 6, wherein the method further comprises:
an isolation current loop is added at the communication port of each device.
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| CN202111072926.8A CN113794665B (en) | 2021-09-14 | 2021-09-14 | System and method for reducing tunnel communication interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111072926.8A CN113794665B (en) | 2021-09-14 | 2021-09-14 | System and method for reducing tunnel communication interference |
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| CN112333739A (en) * | 2014-06-05 | 2021-02-05 | 奥卡多创新有限公司 | Communication system and method |
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Patent Citations (4)
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| CN202587393U (en) * | 2012-03-30 | 2012-12-05 | 京信通信系统（中国）有限公司 | Device for realizing multi-frequency broadband high-speed digital distributed antenna system (DAS) |
| CN112333739A (en) * | 2014-06-05 | 2021-02-05 | 奥卡多创新有限公司 | Communication system and method |
| CN104092498A (en) * | 2014-06-23 | 2014-10-08 | 广东科学技术职业学院 | Co-site mixed signal remote optical fiber radio frequency covering system and method |
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