CN212012644U - Signal shielding system - Google Patents

Abstract

The utility model relates to a signal shielding system, which comprises a transceiver module, a first switch, an optical fiber delay assembly and a radio frequency amplification module; the first switch is provided with a first port, a second port and a third port, the first port is connected with the transceiver module, the second port is connected with the input end of the optical fiber delay assembly, and the third port is connected with the output end of the optical fiber delay assembly; the first switch is used for selectively communicating the second port with the first port or the third port; the input end of the radio frequency amplification module is connected with the output end of the optical fiber delay assembly, and the output end of the radio frequency amplification module is connected with the transceiver module. The utility model discloses a signal shielding system has solved the problem that signal shielding ware is with high costs among the correlation technique, has reduced signal shielding system cost.

Description

Signal shielding system

Technical Field

The utility model relates to a mobile communication field especially relates to a signal shielding system.

Background

When the mobile phone works, the mobile phone and the base station are connected through radio waves in a certain frequency range, and data and sound transmission is completed in a certain baud rate and modulation mode. In response to this communication principle, the handset signal masker scans from the low-end frequency to the high-end frequency of the forward channel at a certain speed during operation. The scanning speed can form code disorder interference in message signals received by the mobile phone, and the mobile phone can not detect normal data sent from the base station, so that the mobile phone can not be connected with the base station. The mobile phone shows the phenomena of network searching, no signal, no service system and the like.

Common shielding devices include a swept-frequency type shielding device, a white noise interference type shielding device, a swept-frequency type shielding device, or a combined fixed-frequency type interference device formed by combining the white noise interference type shielding device and the fixed-frequency type interference device, and a storage-forwarding base station shielding system.

Existing store-and-forward base station screening systems interfere with communications by detecting base station signals and then simulating the base station signals. The storage forwarding type base station shielding system is realized by adopting a digitization technology through an A/D device, a D/A device, an FPGA controller, a high-speed memory and a high-speed PCB. The storage forwarding type base station shielding system realized by adopting the digitization technology has the defects of high cost of the digitization device, technical barriers of an FPGA controller and the like.

Meanwhile, the existing sweep frequency type shielding device, white noise interference type shielding device and combined fixed frequency type interference device have the defects of fixed scanning frequency, easy border crossing of scanning, low interference efficiency and large interference on other systems such as operator base stations, satellite communication and the like.

At present, no effective solution is provided for the problems of high cost, unstable interference performance and easy spread of frequency spectrum of a signal shielding device in the related technology.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a signal shielding system, which uses an optical fiber to cooperate with a switch to implement delay forwarding of a radio frequency signal to generate an interference signal, and has high interference efficiency and low cost.

The utility model provides a signal shielding system, which comprises a transceiver module, a first switch, an optical fiber delay assembly and a radio frequency amplification module; the optical fiber time delay assembly comprises an optical fiber with a preset length; the first switch is provided with a first port, a second port and a third port, the first port is connected with the transceiver module, the second port is connected with the input end of the optical fiber delay assembly, and the third port is connected with the output end of the optical fiber delay assembly; the first switch is used for selectively communicating the second port with the first port or the third port; the input end of the radio frequency amplification module is connected with the output end of the optical fiber delay assembly, and the output end of the radio frequency amplification module is connected with the transceiver module.

Above-mentioned signal shielding system adopts optic fibre time delay subassembly to make the time delay carrier, carries out the time delay through the radio frequency signal of optic fibre transmission to the basic station earlier, later makes optic fibre circulate the radio frequency signal through first switch and forwards, and the radio frequency signal of time delay and the radio frequency signal that the circulation was forwardded constitute the interference signal who disturbs communication network, the utility model discloses a signal shielding system has solved the problem that signal shield ware is with high costs among the correlation technique, has reduced signal shielding system cost.

In order to improve the performance of the signal shielding system and synchronize the TDD system, in an embodiment of the present invention, the signal shielding system further includes a second switch, and the second switch is connected in series between the transceiver module and the first switch.

According to the arrangement, the second switch is used for gating or switching off the communication between the transceiver module and the first switch, so that the transceiver module is switched off at the uplink time slot of the base station in the TDD communication mode to be connected with the optical fiber delay assembly, and the uplink signal of the mobile phone is prevented from entering the optical fiber delay assembly, so that the uplink signal of the mobile phone is prevented from passing through the shielding system, and the receiving link of the base station is prevented from being influenced.

In order to realize the broadband radio frequency signal modulation of receiving on the light signal and based on the time delay of light signal acquisition radio frequency signal the utility model discloses an among the embodiment, optic fibre time delay subassembly is including the optic fibre of predetermineeing length, wavelength division multiplexer and wavelength division multiplexer, wavelength division multiplexer's input is connected with the laser modulator of at least the same kind, wavelength division multiplexer's output with wavelength division multiplexer's input passes through optical fiber connection, wavelength division multiplexer's output is connected with the light module of receiving all the way at least, the output of receiving the light module is connected the input of radio frequency amplification module with the third port of first switch.

According to the arrangement, the radio frequency signal is subjected to amplitude modulation into an optical signal through the laser modulator, the optical signals with various wavelengths are coupled into a composite optical signal through the wavelength division multiplexer, then the composite optical signal is subjected to unified time delay through the optical fiber, the delayed composite optical signal is separated into the delayed optical signal with the corresponding single wavelength through the wavelength division multiplexer, the conversion from the optical signal to the radio frequency signal is realized through the receiving optical module, the received broadband radio frequency signal is modulated into the optical signal, and the time delay of the radio frequency signal is obtained based on the time delay of the optical signal. Meanwhile, the wavelength division multiplexer and the wavelength division multiplexer are adopted, so that the optical fiber delay assembly can delay multiple radio frequency signals at the same time, and the application range of the signal shielding system is expanded.

In order to realize the time delay of the radio frequency signal and save the cost, the utility model discloses an embodiment, optic fibre is single mode bare fiber.

In order to further delay the rf signals of multiple frequencies/frequency bands, in an embodiment of the present invention, the laser modulator includes one of the following: a laser modulator with a wavelength of 1310nm and a laser modulator with a wavelength of 1550 nm.

In order to realize the restoration of the optical signal separated by the de-wavelength division, in an embodiment of the present invention, the receiving optical module is a photoelectric receiver.

In order to satisfy the requirement that the transceiver module can transmit and receive the radio frequency signal, in an embodiment of the present invention, the transceiver module includes a third switch, a first band filter, and a first antenna; the third switch is provided with a fourth port, a fifth port and a sixth port, the fourth port is connected with the first frequency band filter, the fifth port is connected with the first port, the sixth port is connected with the output end of the radio frequency amplification module, and the third switch is used for selectively communicating the fourth port with the fifth port or the sixth port.

According to the arrangement, the first frequency band filter is gated to be communicated with the optical fiber delay assembly or the radio frequency amplification module through the third switch, so that the receiving of radio frequency signals and the sending of interference signals are achieved. The third switch selectively enables the first frequency band filter to be communicated with the optical fiber delay assembly or the radio frequency amplification module, and the receiving and transmitting work of the signal shielding system can be completed by adopting the receiving and transmitting integrated antenna.

In order to meet the requirement of engineering installation, in an embodiment of the present invention, the transceiver module further includes a second antenna, a second frequency band filter, and a fourth switch, wherein the second antenna is connected to one end of the second frequency band filter; the fourth switch is provided with a seventh port, an eighth port and a ninth port, the seventh port is connected with the other end of the second frequency band filter, the eighth port is connected with the fifth port, the ninth port is connected with the first port, and the fourth switch is used for selectively communicating the ninth port with the seventh port or the eighth port.

So set up, when the fourth switch selects to communicate ninth port and seventh port, transceiver module selects to use the second antenna as receiving antenna, and transceiver module selects to use first antenna as transmitting antenna, through first antenna and the cooperation of second antenna, can realize transceiver module and use separately the antenna to receive and dispatch radio frequency signal.

In order to realize the control of the signal shielding system and realize the receiving link without affecting the base station, in an embodiment of the present invention, the shielding system further comprises a power module, a control unit and a clock unit, the power module is electrically connected with the control unit, the clock unit, the transceiver module, the second switch, the first switch, the optical fiber delay assembly and the radio frequency amplification module and supplies power, the control unit is electrically connected with the clock unit, the transceiver module, the second switch, the first switch, the optical fiber delay assembly and the radio frequency amplification module, wherein the control unit can control the clock unit to provide a synchronous clock signal synchronous with the base station clock for the signal shielding system and control the number of times of the optical fiber delay assembly circularly delaying the radio frequency signal, the control unit can control the second switch to be disconnected at the uplink time of the base station, and the transceiver module is disconnected from the optical fiber delay assembly, and the control unit also closes the radio frequency amplification module at the uplink moment of the base station.

In order to realize the turn-off and turn-on functions of the switch, in an embodiment of the present invention, the first switch, the third switch and the fourth switch are all single-pole double-throw radio frequency microwave electronic switches; and/or the second switch is a single-pole single-throw radio frequency microwave electronic switch.

Drawings

FIG. 1 is a structural view of a signal shielding system according to an embodiment of the present application;

FIG. 2 is a structural view of a signal shielding system according to a preferred embodiment of the present application;

fig. 3 is a structural view of a signal shielding system for a time division duplex system according to an embodiment of the present application;

FIG. 4 is a block diagram of a signal shielding system for shielding multiple RF signals according to an embodiment of the present application;

FIG. 5 is a structural view of the fiber optic delay assembly of the present application;

fig. 6 is a block diagram of a signal masking system according to the present application.

Description of reference numerals:

100. a transceiver module;

11. a third switch;

12. a first band filter;

13. a first antenna;

14. a second antenna;

15. a fourth switch;

16. a second band filter;

111. a fourth port;

112. a fifth port;

113. a sixth port;

151. a seventh port;

152. an eighth port;

153. a ninth port;

200. a first switch;

201. a first port;

202. a second port;

203. a third port;

300. a fiber optic delay assembly;

31. an optical fiber;

32. a wavelength division multiplexer;

33. a wavelength division multiplexer;

34. a laser modulator;

35. receiving an optical module;

400. a radio frequency amplification module;

500. a second switch;

600. a power supply module;

700. a control unit;

800. a clock unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Fig. 1 is a structural view of a signal shielding system according to an embodiment of the present application. The illustrated signal shielding system uses the optical fiber delay component 300 to cooperate with the first switch 200 to implement delay and cyclic forwarding of the radio frequency signal to generate an interference signal, and has high interference efficiency and low construction cost of the signal shielding system.

Referring to fig. 1, a signal shielding system according to an embodiment of the present invention includes a transceiver module 100, a first switch 200, an optical fiber delay assembly 300, and a radio frequency amplification module 400; the first switch 200 is provided with a first port 201, a second port 202 and a third port 203, the first port 201 is connected with the transceiver module 100, the second port 202 is connected with the input end of the optical fiber delay assembly 300, and the third port 203 is connected with the output end of the optical fiber delay assembly 300; the first switch 200 is used for selectively communicating the second port 202 with the first port 201 or the third port 203; the input end of the rf amplification module 400 is connected to the output end of the optical fiber delay assembly 300, and the output end of the rf amplification module 400 is connected to the transceiver module 100.

The signal shielding system adopts the optical fiber delay component 300 as a delay carrier, firstly, the radio frequency signal of the base station is delayed through optical fiber transmission, then, the optical fiber delay component 300 circularly forwards the radio frequency signal through the first switch 200, the delayed radio frequency signal and the circularly forwarded radio frequency signal form an interference signal which interferes a communication network, the optical fiber delay component 300 and the first switch 200 are used for completing the delay of the radio frequency signal and forming the interference signal, the problem of high cost of a signal shielding device in the related technology is solved, the cost of the signal shielding system is reduced, and meanwhile, the signal shielding system has high interference efficiency.

It should be noted that, in the embodiment of the present application, the transceiver module 100 is used for receiving a radio frequency signal from a base station or for transmitting an interference signal; the first switch 200, which may also be a loopback switch or a gating switch, is used to connect the fiber delay assembly 300 to the transceiver module 100 and receive the radio frequency signal (the first switch 200 gates the transceiver module 100 to connect with the fiber delay assembly 300), or tangentially loop back the fiber delay assembly 300 (the first switch 200 disconnects the transceiver module 100 from the fiber delay assembly 300); the optical fiber delay component 300 is used for delaying the received or circularly looped back radio frequency signal; the rf amplifying module 400 is configured to amplify the rf signal that is delayed and/or looped back and forwarded by the optical fiber delay component 300 to form an interference signal. It should be further noted that the tangential loopback refers to turning off the connection of the transceiver module 100 of the optical fiber delay assembly 300 to connect the input end and the output end of the optical fiber delay assembly 300, so that the signal output by the output end of the optical fiber delay assembly 300 can be looped back to the input end of the optical fiber delay assembly 300 and transmitted to obtain the delay.

In order to satisfy the requirement that the transceiver module can transceive radio frequency signals, referring to fig. 1, in one embodiment, the transceiver module 100 includes a third switch 11, a first band filter 12, and a first antenna 13; wherein, the first antenna 13 is connected with one end of the first frequency band filter 12; the third switch 11 is provided with a fourth port 111, a fifth port 112, and a sixth port 113, the fourth port 111 is connected to the other end of the first band filter 12, the fifth port 112 is connected to the first port 201, the sixth port 113 is connected to the output end of the radio frequency amplification module 400, and the third switch 11 is configured to selectively communicate the fourth port 111 with the fifth port 112 or the sixth port 113.

It can be understood that, with this arrangement, the third switch 11 gates the first band filter 12 to communicate with the optical fiber delay assembly 300 or the rf amplifying module 400, so as to implement receiving of the rf signal and transmitting of the interference signal. It should be understood that, the third switch 11 selectively connects the first band filter 12 to the optical fiber delay assembly 300 (the fourth port 111 is communicated with the fifth port 112) or the radio frequency amplification module 400 (the fourth port 111 is communicated with the fifth port 112), so that the transceiver of the signal shielding system (corresponding to a working mode of the signal shielding system) can be completed by using the transceiver-integrated antenna. In the embodiment of the present application, the first antenna 13 is a transceiver antenna.

It is understood that, in order to meet the requirement of engineering installation, referring to fig. 2, in one embodiment, the transceiver module 100 further includes a second antenna 14, a second band filter 16, and a fourth switch 15, wherein the second antenna 14 is connected to one end of the second band filter 16, the fourth switch 15 is provided with a seventh port 151, an eighth port 152, and a ninth port 153, the seventh port 151 is connected to the other end of the second band filter 16, the eighth port 152 is connected to the fifth port 112, the ninth port 153 is connected to the first port 201, and the fourth switch 15 is configured to selectively communicate the ninth port 153 with the seventh port 151 or the eighth port 152.

With such a configuration, when the fourth switch 15 selects to connect the ninth port 153 and the seventh port 151, the transceiver module 100 selects the second antenna 14 as the receiving antenna, and the transceiver module 100 selects the first antenna 13 as the transmitting antenna, so that the transceiver module 100 can transmit and receive the radio frequency signal by using the separate antennas through the cooperation of the first antenna 13 and the second antenna 14. This corresponds to another mode of operation of the signal shielding system (split antenna transmit and receive).

It should be noted that, in practice, for all signal systems, the components in the system have operating bandwidths, in the embodiment of the present application, the operating principle and process of shielding signals corresponding to a certain frequency band are only exemplified, and for shielding signals of multiple frequency bands and combined frequency bands, the components and their connection relationships in the present application may be integrated, for example; the construction of a signal shielding system is realized by adopting a broadband antenna, a broadband amplifier, a broadband power amplifier and a multifrequency filter.

In an alternative embodiment, the third switch 11 and the fourth switch 15 are both single-pole double-throw rf microwave electronic switches.

In the embodiment of the present application, the signal shielding system shown in fig. 1 and fig. 2 is suitable for an FDD system, and the process of implementing signal shielding by the signal shielding system is as follows: the transceiver module 100 receives a radio frequency signal from a base station, enters the optical fiber delay assembly 300 through the first switch 200, and under the clock control of the signal shielding system, when the delay time of the optical fiber delay assembly 300 is reached, the third switch 11 is gated to the output end of the radio frequency amplification module 400 to be connected with the first frequency band filter 12, so that the radio frequency amplification module 400 is connected with the first antenna 13, and the transmission is started to allow the radio frequency signal delayed and circularly forwarded to be amplified and then transmitted to the air to interfere with the base station signal. Meanwhile, the first switch 200 loops back tangentially (the first switch 200 connects the second port 202 with the third port 203, so that the transceiver module 100 is disconnected from the optical fiber delay assembly 300) until N times of loops (system clock control) are reached, and the next round of reception is restarted after the loop is ended.

In one alternative embodiment, the first switch 200 is a single pole double throw rf microwave electronic switch.

Fig. 3 is a structural view of a signal shielding system for a time division duplex system according to an embodiment of the present application. As shown in fig. 3, in order to improve the performance of the signal shielding system and synchronize the TDD system, in one embodiment, the signal shielding system further includes a second switch 500, and the second switch 500 is connected in series between the transceiver module 100 and the first switch 200.

It should be understood that, with such an arrangement, the second switch 500 is used to gate or turn off the connection between the transceiver module 100 and the first switch 200, so that the transceiver module 100 is turned off in the uplink timeslot of the base station in the TDD communication mode to connect the optical fiber delay assembly 300, thereby preventing the uplink signal of the mobile phone from entering the optical fiber delay assembly 300, and thus ensuring that the uplink signal of the mobile phone does not pass through the shielding system, and avoiding affecting the receiving link of the TDD base station.

In the embodiment of the present application, the signal masking system shown in fig. 3 is suitable for a TDD system, and the signal masking system implements signal masking as follows: the transceiver module 100 receives a radio frequency signal from a base station, enters the optical fiber delay assembly 300 through the first switch 200, and under the clock control of the signal shielding system, when the delay time of the optical fiber delay assembly 300 is reached, the third switch 11 is gated to the output end of the radio frequency amplification module 400 to be connected with the first frequency band filter 12, so that the radio frequency amplification module 400 is connected with the first antenna 13, and the transmission is started to allow the radio frequency signal delayed and circularly forwarded to be amplified and then transmitted to the air to interfere with the base station signal. Meanwhile, the first switch 200 loops back tangentially (the first switch 200 connects the second port 202 with the third port 203, so that the transceiver module 100 is disconnected from the optical fiber delay assembly 300) until N times of loops (system clock control) are reached, and the next round of reception is restarted after the loop is ended; meanwhile, the second switch 500 is turned off at the uplink time of the TDD base station (the uplink timeslot of the base station signal in the TDD mode), and the rf amplifying module 400 is turned off at the same time, so that the uplink communication of the base station is not interfered.

In one alternative embodiment, the second switch 500 is a single pole single throw rf microwave electronic switch.

Fig. 4 is a structural diagram of a signal shielding system for shielding multiple rf signals on optical paths with multiple wavelengths according to an embodiment of the present application. As shown in fig. 4, when delay processing is required to be performed on radio frequency signals with multiple wavelengths, a signal shielding system may be formed by multiple sets of transceiver modules 100, multiple first switches 200, one or more optical fiber delay assemblies 300, and multiple radio frequency amplification modules 400. The actual system may have multiple sets of antennas, multiple sets of optical fiber delay assemblies 300, and multiple sets of rf amplification modules 400. The integration of the above-mentioned multiple sets of parts can reduce the cost and optimize the system performance.

FIG. 5 is a structural view of the fiber optic delay assembly of the present application. As shown in fig. 5, in order to modulate a received broadband radio frequency signal on an optical signal and obtain a time delay of the radio frequency signal based on the time delay of the optical signal, in one embodiment, the optical fiber time delay assembly 300 includes an optical fiber 31 with a preset length, a wavelength division multiplexer 32 and a wavelength division multiplexer 33, an input end of the wavelength division multiplexer 32 is connected to at least one laser modulator 34, an output end of the wavelength division multiplexer 32 is connected to an input end of the wavelength division multiplexer 33 through the optical fiber 31, an output end of the wavelength division multiplexer 32 is connected to at least one receiving optical module 35, and an output end of the receiving optical module 35 is connected to an input end of the radio frequency amplification module 400 and the third port 203.

It should be understood that, with such an arrangement, the radio frequency signal is amplitude (RF) modulated into an optical signal by the laser modulator 34, the optical signals with multiple wavelengths are coupled into a composite optical signal by the wavelength division multiplexer 32, then the composite optical signal is uniformly delayed by the optical fiber 31, the delayed composite optical signal is demultiplexed by the wavelength division demultiplexer 33 into delayed optical signals with corresponding single wavelengths, and then the optical signal is converted into the radio frequency signal by the receiving optical module 35, so that the received broadband radio frequency signal is modulated into the optical signal, and the time delay of the radio frequency signal is obtained based on the optical signal time delay. Meanwhile, the wavelength division multiplexer 32 and the wavelength division demultiplexer 33 are adopted, so that the optical fiber delay assembly 300 can simultaneously delay multiple radio frequency signals, and the application range of the signal shielding system is expanded.

It should be noted that the wavelength division multiplexer 32 is configured to couple the optical signal (carrying the corresponding radio frequency signal) with at least one wavelength, which is amplitude (RF) modulated by the laser modulator 34, into a composite optical signal, and the optical fiber 31 is configured to delay the composite optical signal; the demultiplexer 33 is configured to separate the delayed composite optical signal into a corresponding delayed optical signal with a single wavelength; the receiving optical module 35 is used for recovering the delayed rf signal of a single wavelength.

Referring to fig. 5, the process of delaying the rf signal by the optical fiber delay assembly 300 in the embodiment of the present application is as follows: the radio frequency signal enters the laser modulator 34 from the input, the light coming out through the laser modulator 34 passes through the optical fiber 31 after passing through the wavelength division multiplexer 32, and is accessed to the input port of the receiving optical module 35 after passing through the wavelength division multiplexer 33 at the outlet of the optical fiber 31, and the delayed radio frequency signal is output through the receiving optical module 35.

It should be noted that, by increasing the number of wavelengths of the wavelength division multiplexing, the number of paths of the laser modulator, and the number of paths of the receiving optical module, the number of delay channels can be increased.

In order to achieve time delay and cost savings for the radio frequency signal, in one embodiment, the optical fiber 31 is a single mode bare fiber. Meanwhile, the optical fiber 31 that satisfies the requirement of transmitting the optical signal is suitable for the optical fiber delay assembly 300 of the present application. For example: OTDR test extended fiber and bare fiber in box can be selected. In order to meet the time delay requirement for obtaining the set time of the signal shielding system, the length of the optical fiber 31 is selected according to the time delay duration of the optical fiber 31 with unit length, and in practice, the time delay of the optical fiber with 1 km length is about 5 microseconds. At the same time, the length of the optical fiber 31 is determined according to the cost of the signal shielding system and the degree of optimizing the shielding effect of the signal shielding system. For example: when the signal shielding system requires a long time delay, the corresponding optical fiber 31 is also long, but the longer the optical fiber 31 is, the higher the cost is, at this time, the first switch 200 may be adopted to perform cyclic forwarding, so as to shorten the length of the optical fiber 31 and reduce the cost of the signal shielding system. Another example is: the degree of optimization of the shielding effect of the signal shielding system determines the length of the optical fiber 31, and in this case, the length of the optical fiber 31 is selected according to the degree of optimization of the shielding effect of the signal shielding system.

To further delay the rf signals of multiple frequencies/bands, in one embodiment, the laser modulator 34 includes one of: a laser modulator with a wavelength of 1310nm and a laser modulator with a wavelength of 1550 nm. It should be noted that the laser modulator 34 that modulates the radio frequency signal into the optical signal in the present application is suitable for the laser modulator 34 in the present application.

In order to recover the optical signal obtained by demultiplexing, in one embodiment, the receiving optical module 35 is an optical receiver.

Fig. 6 is a block diagram of a signal masking system according to the present application. As shown in fig. 6, in order to implement the control of the signal shielding system and implement the receiving link without affecting the base station, in one embodiment, the shielding system further includes a power module 600, a control unit 700 and a clock unit 800, the power module 600 is electrically connected to and supplies power to the control unit 700, the clock unit 800, the transceiver module 100, the second switch 500, the first switch 200, the optical fiber delay assembly 300 and the rf amplification module 400, the control unit 700 is electrically connected to and supplies power to the clock unit 800, the transceiver module 100, the second switch 500, the first switch 200, the optical fiber delay assembly 300 and the rf amplification module 400, wherein the control unit 700 can control the clock unit 800 to provide a synchronous clock signal synchronized with the clock of the base station (the base station system in TDD mode) for the signal shielding system and control the number of times that the optical fiber delay assembly 300 cyclically delays the rf signal, the control unit 700 can control the second switch 500 to be turned off at the uplink, the transceiver module 100 is disconnected from the optical fiber delay module 300, and the control unit 700 further turns off the rf amplifying module 400 at the uplink time of the base station (uplink timeslot of base station signal in TDD mode).

It should be noted that, the control unit 700 controls the number of times that the optical fiber delay assembly 300 cyclically delays the radio frequency signal to be provided by the clock unit 800, and controls the second switch 500 to connect the transceiver module 100 with the optical fiber delay assembly 300 within the set receiving time, so as to receive a new radio frequency signal. In the corresponding loopback period, the third port 203 of the first switch 200 is connected to the second port 202 thereof, so that the first transceiver module 100 is connected to the optical fiber delay assembly 300, and the corresponding optical fiber delay assembly 300 performs loopback conversion and cyclic delay. It should be further noted that the power module 600 may be implemented by using a corresponding power adapter in the prior art, and the control unit 700 may be implemented by using a signal masker controller in the prior art, it should be understood that the control unit 700 is in the prior art; the clock unit 800 should be understood as a prior art, and the clock unit 800 may implement clock control based on a clock chip in cooperation with the control unit 700.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims (10)

1. A signal shielding system, comprising a transceiver module (100), a first switch (200), a fiber delay assembly (300) and a radio frequency amplification module (400); wherein the content of the first and second substances,

the first switch (200) is provided with a first port (201), a second port (202) and a third port (203), the first port (201) is connected with the transceiver module (100), the second port (202) is connected with the input end of the optical fiber delay assembly (300), and the third port (203) is connected with the output end of the optical fiber delay assembly (300);

-the first switch (200) is adapted to selectively communicate the second port (202) with the first port (201) or the third port (203);

the input end of the radio frequency amplification module (400) is connected with the output end of the optical fiber delay assembly (300), and the output end of the radio frequency amplification module (400) is connected with the transceiver module (100).

2. The signal shielding system according to claim 1, further comprising a second switch (500), the second switch (500) being connected in series between the transceiver module (100) and the first switch (200).

3. The signal shielding system according to claim 1, wherein the optical fiber delay assembly (300) comprises a preset length of optical fiber (31), a wavelength division multiplexer (32) and a wavelength division multiplexer (33), an input end of the wavelength division multiplexer (32) is connected with at least one laser modulator (34), an output end of the wavelength division multiplexer (32) and an input end of the wavelength division multiplexer (33) are connected through the optical fiber (31), an output end of the wavelength division multiplexer (33) is connected with at least one receiving optical module (35), and an output end of the receiving optical module (35) is connected with an input end of the radio frequency amplification module (400) and the third port (203).

4. The signal shielding system according to claim 3, wherein the optical fiber (31) is a single-mode bare fiber.

5. The signal shielding system of claim 3, wherein the laser modulator (34) comprises one of: a laser modulator with a wavelength of 1310nm and a laser modulator with a wavelength of 1550 nm.

6. Signal screening system according to claim 3, characterized in that said receiving optical module (35) is a photoelectric receiver.

7. The signal shielding system according to claim 1, wherein the transceiver module (100) comprises a third switch (11), a first band filter (12) and a first antenna (13); wherein the content of the first and second substances,

the first antenna (13) is connected with one end of the first frequency band filter (12);

the third switch (11) is provided with a fourth port (111), a fifth port (112) and a sixth port (113), the fourth port (111) is connected with the first band filter (12), the fifth port (112) is connected with the first port (201), the sixth port (113) is connected with the output end of the radio frequency amplification module (400), and the third switch (11) is used for selectively communicating the fourth port (111) with the fifth port (112) or the sixth port (113).

8. Signal shielding system according to claim 7, characterized in that the transceiver module (100) further comprises a second antenna (14), a second band filter (16) and a fourth switch (15), wherein,

the second antenna (14) is connected with one end of the second frequency band filter (16);

the fourth switch (15) is provided with a seventh port (151), an eighth port (152) and a ninth port (153), the seventh port (151) is connected with the other end of the second band filter (16), the eighth port (152) is connected with the fifth port (112), the ninth port (153) is connected with the first port (201), and the fourth switch (15) is used for selectively communicating the ninth port (153) with the seventh port (151) or the eighth port (152).

9. The signal shielding system according to claim 2, further comprising a power module (600), a control unit (700), and a clock unit (800), wherein the power module (600) electrically connects and supplies power to the control unit (700), the clock unit (800), the transceiver module (100), the second switch (500), the first switch (200), the optical fiber delay assembly (300), and the rf amplification module (400), and the control unit (700) electrically connects and supplies power to the clock unit (800), the transceiver module (100), the second switch (500), the first switch (200), the optical fiber delay assembly (300), and the rf amplification module (400), wherein the control unit (700) can control the clock unit (800) to provide a synchronous clock signal synchronized with a base station clock for the signal shielding system and control the optical fiber delay assembly (300) to cyclically delay the rf amplification module (400), and wherein the control unit (700) can control the clock unit (800) to provide a synchronous clock signal synchronized with the base station clock for the signal shielding system and control the optical fiber delay assembly And the control unit (700) can control the second switch (500) to be switched off at the uplink time of the base station to switch off the transceiver module (100) and the optical fiber delay assembly (300), and the control unit (700) also switches off the radio frequency amplification module (400) at the uplink time of the base station.

10. The signal shielding system according to any one of claims 1 to 9, wherein the first switch (200), the third switch (11) and the fourth switch (15) are all single-pole double-throw radio frequency microwave electronic switches; and/or the second switch (500) is a single-pole single-throw radio frequency microwave electronic switch.

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