CN110572235A - Signal shielding device and method - Google Patents
Signal shielding device and method Download PDFInfo
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- CN110572235A CN110572235A CN201910868905.3A CN201910868905A CN110572235A CN 110572235 A CN110572235 A CN 110572235A CN 201910868905 A CN201910868905 A CN 201910868905A CN 110572235 A CN110572235 A CN 110572235A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/68—Jamming involving special techniques using passive jamming, e.g. by shielding or reflection
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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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Abstract
The invention relates to a signal shielding device and a method, wherein the signal shielding device comprises a receiving module, a modulation module and a transmitting module, the receiving module, the modulation module and the transmitting module are connected in sequence, wherein: the receiving module is used for receiving the current network signal; the modulation module is used for receiving the current network signal transmitted by the receiving module and modulating the shielding signal based on the communication system of the current network signal; the communication system modulation shielding signal based on the existing network signal also comprises the steps of identifying the existing network signal system, generating corresponding modulation signals aiming at different existing network signal systems based on the prior knowledge with the optimal sweep frequency interference effect, and generating shielding signals based on the modulation signals; and the transmitting module is used for transmitting the shielding signal. The signal shielding device and the signal shielding method can adjust the shielding signals according to the change of the existing network signals, do not need to set different shielding circuits aiming at the existing network signals of different systems, and have higher shielding efficiency and lower cost.
Description
Technical Field
the present invention relates to the field of mobile communications technologies, and in particular, to a signal shielding apparatus and method.
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.
The traditional shielding device adopts an analog frequency sweeping scheme, generates triangular waves through an NC555 timer, is connected to the input end of a voltage-controlled oscillator, amplifies the triangular waves and finally transmits the triangular waves through an antenna. The shielding method is simple to operate and low in cost, so that the shielding method is widely applied, but the scheme has the problems of fixed scanning frequency, over-bound scanning frequency boundary and the like, generates serious interference on other systems such as an operator base station, satellite communication and the like, and has very poor interference effect on a product. In addition, with the construction and popularization of 3G, 4G and 5G communication networks of operators, the change of existing network signals is larger and larger, multiple communication systems are often contained in the same frequency band, different communication systems have different sensitivity degrees to frequency sweep interference periods, different shielding circuits need to be set for existing network signals of different systems, and therefore shielding efficiency is lower and cost is increased.
Disclosure of Invention
Therefore, it is necessary to provide a signal shielding apparatus and method for solving the problems that the existing network signals change more and more with the construction and popularization of 3G, 4G, and 5G communication networks of operators, and different shielding circuits need to be arranged for the existing network signals of different standards, so that the shielding efficiency is low and the cost is increased.
The utility model provides a signal shielding device, signal shielding device includes receiving module, modulation module and emission module, receiving module, modulation module and emission module link to each other in proper order, wherein:
the receiving module is used for receiving the current network signal;
The modulation module is used for receiving the current network signal transmitted by the receiving module and modulating the shielding signal based on the communication system of the current network signal; the communication system modulation shielding signal based on the existing network signal also comprises the steps of identifying the existing network signal system, generating corresponding modulation signals aiming at different existing network signal systems based on the prior knowledge with the optimal sweep frequency interference effect, and generating shielding signals based on the modulation signals;
and the transmitting module is used for transmitting the shielding signal.
in one embodiment, the modulation module includes a receiving unit, a baseband signal processing unit, and a shielding signal generating unit, where the receiving unit is connected to the receiving module, the receiving unit, the baseband signal processing unit, and the shielding signal generating unit are sequentially connected, the shielding signal generating unit is connected to the transmitting module, the receiving unit is configured to receive a present network signal transmitted by the receiving module and convert the present network signal into a digital signal, the baseband signal processing unit receives the digital signal and generates a modulation signal based on the digital signal, and the shielding signal generating unit is configured to modulate a shielding signal based on the modulation signal and transmit the shielding signal to the transmitting module.
In one embodiment, the baseband signal processing unit is further configured to identify a format, a start frequency, and a cut-off frequency of the existing network signal to adjust a frequency and a boundary of the mask signal.
In one embodiment, the baseband signal processing signal is further configured to adjust a boundary of a mask signal composed of a plurality of discontinuous frequency bands and a start frequency and a cut-off frequency of an intermediate frequency band.
in one embodiment, the shielding signal generating unit includes a digital-to-analog converter, a voltage-controlled oscillator, a modulation filter, and a modulation amplifier, the digital-to-analog converter, the voltage-controlled oscillator, the modulation filter, and the modulation amplifier are sequentially connected, the digital-to-analog converter is connected to the baseband signal processing unit, the modulation amplifier is connected to the transmitting module, and the baseband signal processing unit controls the digital-to-analog converter to generate a corresponding waveform to control the voltage-controlled oscillator to generate a corresponding waveform and boundary based on the system and boundary of the existing network signal, and generates the shielding signal after the waveform is processed by the modulation filter and the modulation amplifier.
In one embodiment, the baseband signal processing unit is further configured to receive a mask signal modulated by the modulation signal, and adjust the modulation signal based on the mask signal to adjust a boundary of the mask signal.
in one embodiment, the baseband signal processing unit compares the boundary of the mask signal with the boundary of the present network signal, and adjusts the output waveform of the digital-to-analog converter according to the error to adjust the boundary of the mask signal and calibrate the error formed by the voltage-controlled oscillator.
In one embodiment, the baseband signal processing unit is further configured to analyze a switch signal of an existing network signal of the tdd scheme, so that the shielding signal is transmitted when the existing network signal of the tdd scheme is downlink.
In one embodiment, the receiving unit includes a receiving amplifier, a mixer, a receiving filter, and an analog-to-digital converter, the receiving amplifier, the mixer, the receiving filter, and the analog-to-digital converter are connected in sequence, the receiving amplifier is connected to the receiving module, the analog-to-digital converter is connected to the baseband signal processing unit, and the mixer includes a phase-locked loop.
in one embodiment, the signal shielding apparatus further includes a filtering module, where the filtering module is disposed between the receiving module and the modulating module, and is configured to filter the present network signals in different frequency bands respectively.
In one embodiment, the filtering module includes a first radio frequency switch, a second radio frequency switch and a filtering structure, the first radio frequency switch, the filtering structure and the second radio frequency switch are sequentially connected, the first radio frequency switch is connected with the receiving module, the second radio frequency switch is connected with the modulating module, and the first radio frequency switch and the second radio frequency switch are switched to the same frequency band when switched.
in one embodiment, the filtering structure comprises at least one filtering unit, and the frequency ranges covered by the filtering units are not overlapped; the filtering structure traverses all frequency bands through time-sharing switching, and acquires and analyzes the existing network signals.
In one embodiment, the first rf switch and the second rf switch are aligned with a frequency band of the pll loop.
In one embodiment, the modulation module further includes a monitoring unit, and the monitoring unit is connected to the baseband signal processing unit and configured to monitor an operating condition of the modulation module.
In one embodiment, the modulation module further includes a clock unit, and the clock unit is connected to the baseband signal processing unit and is configured to synchronize with a frequency of a digital signal in the baseband signal processing unit.
In one embodiment, the baseband signal processing unit is further configured to resolve a frequency error of a time division duplex system, so as to synchronize the clock unit to a base station.
in one embodiment, the modulation module further comprises a variable gain amplifier for adjusting the strength of the masking signal according to the strength of the existing network signal.
A signal shielding method applied to the signal shielding apparatus, the method comprising:
Receiving a present network signal;
Identifying a communication system, an initial frequency and a cut-off frequency of the existing network signal, and generating a modulation signal based on the existing network signal;
Modulating a masking signal based on the modulation signal;
And transmitting the shielding signal.
In one embodiment, the modulating the mask signal based on the modulation signal comprises:
Converting the modulation signal into an analog signal;
Adjusting a voltage of the analog signal;
Filtering the analog signal;
and adjusting the strength of the analog signal to generate a shielding signal.
The signal shielding device and the method comprise a receiving module, a modulating module and a transmitting module, wherein: the receiving module is used for receiving the current network signal modulation module, is connected with the receiving module, and is used for receiving the current network signal transmitted by the receiving module and modulating the shielding signal based on the communication system of the current network signal; the communication system modulation shielding signal based on the existing network signal also comprises the steps of identifying the existing network signal system, generating corresponding modulation signals aiming at different existing network signal systems based on the prior knowledge with the optimal sweep frequency interference effect, and generating shielding signals based on the modulation signals; and the transmitting module is connected with the modulating module and used for receiving and transmitting the shielding signal, so that the shielding signal can be adjusted according to the change of the existing network signal, different shielding circuits do not need to be arranged aiming at the existing network signals of different systems, the shielding efficiency is higher, and the cost is lower.
Drawings
FIG. 1 is a schematic diagram of a signal shielding apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a signal shielding apparatus according to another embodiment of the present invention;
FIG. 3 is a diagram illustrating a filtering module according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a modulation module according to an embodiment of the invention;
FIG. 5 is a diagram of a receiving unit according to an embodiment of the present invention;
FIG. 6 is a diagram of a mask signal generating unit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of frequency sweep control for existing network signals of different communication systems according to an embodiment of the present invention;
FIG. 8 is a block diagram of a signal shielding apparatus according to an embodiment of the present invention;
FIG. 9 is a networking topology diagram of a monitoring unit of one embodiment of the present invention;
Fig. 10 is a schematic diagram of a signal shielding method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a signal shielding device according to an embodiment of the invention.
in this embodiment, the signal shielding apparatus includes a receiving module 1, a modulating module 2, and a transmitting module 3, wherein:
The receiving module 1 is used for receiving the current network signal;
The modulation module 2 is connected with the receiving module 1 and is used for receiving the existing network signal transmitted by the receiving module 1 and modulating the shielding signal based on the communication system of the existing network signal; the communication system modulation shielding signal based on the existing network signal also comprises a modulation signal which is used for identifying the existing network signal system, generating corresponding modulation signals aiming at different existing network signal systems based on the prior knowledge with the optimal sweep frequency interference effect, and generating the shielding signal based on the modulation signal;
and the transmitting module is connected with the modulating module 2 and used for receiving and transmitting the shielding signal.
The signal shielding device can adjust the shielding signal according to the change of the existing network signal, does not need to set different shielding circuits aiming at the existing network signals of different systems, and has higher shielding efficiency and lower cost.
Referring to fig. 2, fig. 2 is a schematic diagram of a signal shielding apparatus according to another embodiment of the present invention.
In this embodiment, the signal shielding device includes a receiving module 1, a filtering module 4, a modulating module 2, and a transmitting module 3, where the receiving module 1, the filtering module 4, the modulating module 2, and the transmitting module 3 are connected in sequence. Wherein the filtering module 4 is used for filtering noise in the existing network signal.
Illustratively, the receiving module 1 includes a receiving antenna, which may be a wideband omni-directional receiving antenna. It can be understood that the receiving module 1 may select other types of antennas, and only needs to achieve the effect of receiving the current network signal.
Referring to fig. 3, fig. 3 is a schematic diagram of a filtering module 4 according to an embodiment of the invention. In this embodiment, the filtering module 4 includes a first rf switch 40, a second rf switch 41, a first filtering unit 42, and a second filtering unit 43, where the first rf switch 40, the first filtering unit 42, the second rf switch 41, and the second filtering unit 43 are sequentially connected, where the first rf switch 40 is connected to the receiving module 1, and the second rf switch 41 is connected to the modulating module 2. The first rf switch 40 and the second rf switch 41 are used to control the current network signals of different frequency bands to be filtered through the first filtering unit 42 or the second filtering unit 43, so that when the first rf switch 40 and the second rf switch 41 are switched, the current network signals must be synchronously switched to one frequency band. Specifically, the present network signal transmitted by the receiving antenna is transmitted to the first filtering unit 42 or the second filtering unit 43 through the first radio frequency switch 40, is transmitted to the second radio frequency switch 41 after being filtered by the first filtering unit 42 or the second filtering unit 43, and is transmitted to the modulation module 2 through the second radio frequency switch 41.
Illustratively, the first filtering unit 42 and the second filtering unit 43 are a set of filtering structures, in this embodiment, the filtering structure includes two filtering units, and in other embodiments, the filtering structure may include a plurality of filtering units, and the frequency ranges covered by the filtering units do not overlap, depending on the frequency band division of different countries or regions. Specifically, the frequency range of the existing network signals in china is 800MHz-2700MHz, and the existing network signals are divided into 8 frequency bands, i.e., 8 frequency bands such as 870MHz-880 MHz, 930MHz-960 MHz, 1805MHz-1880MHz, 1885MHz-1915MHz, 2010MHz-2015MHz, 2110MHz-2170MHz, 2300MHz-2390MHz, and 2555MHz-2655 MHz, at this time, 8 filter units corresponding to the frequency bands need to be set, all the frequency bands are traversed by time-sharing switching, and the existing network signals are collected and analyzed.
It is understood that the foregoing radio frequency switch may be a single-pole multi-throw switch, and the number of the stationary terminals of the single-pole multi-throw switch matches with the number of the filtering units of the filtering structure, and corresponds to one another. Specifically, when the filtering structure includes 8 filtering units, the radio frequency switch is a single-pole eight-throw switch.
Referring to fig. 4, fig. 4 is a schematic diagram of a modulation module 2 according to an embodiment of the invention. In this embodiment, the modulation module 2 includes a receiving unit 20, a baseband signal processing unit 21, and a mask signal generating unit 22, where:
The receiving unit 20 is connected with the receiving module 1, the receiving unit 20, the baseband signal processing unit 21 and the shielding signal generating unit 22 are sequentially connected, and the shielding signal generating unit 22 is connected with the transmitting module; the receiving unit 20 is configured to receive an existing network signal transmitted by the receiving module 1 and convert the existing network signal into a digital signal, the baseband signal processing unit 21 identifies an existing network signal system and generates a corresponding modulation signal based on different existing network signal systems, and the shielding signal generating unit 22 is configured to modulate a shielding signal based on the modulation signal and transmit the shielding signal to the transmitting module.
referring to fig. 5, fig. 5 is a schematic diagram of a receiving unit 20 according to an embodiment of the invention. In this embodiment, the receiving unit 20 includes a receiving amplifier 200, a mixer 201, a receiving filter 202, and an analog-to-digital converter 203, where the receiving amplifier 200, the mixer 201, the receiving filter 202, and the analog-to-digital converter 203 are sequentially connected, the receiving amplifier 200 is connected to the receiving module 1, and the analog-to-digital converter 203 is connected to the baseband signal processing unit 21. It can be understood that the present network signal is filtered by the filtering module 4 and then transmitted to the receiving amplifier 200, amplified by the receiving amplifier 200 and then sent to the mixer 201, mixed and then sent to the receiving filter 202, filtered by the receiving filter 202 and then sent to the analog-to-digital converter 203 to implement analog-to-digital conversion, and then converted into a digital signal and transmitted to the baseband signal processing unit 21. Specifically, the receiving Amplifier 200 is a wideband radio frequency Digital Variable Gain Amplifier 223 (DVGA), and the mixer 201 is integrated with a Phase Locked Loop (PLL).
it is understood that the pll loop is used to integrate the clock signal uniformly to enable the high frequency device to work normally, such as accessing data of the memory. A phase-locked loop is a feedback circuit that functions to synchronize the phase of the clock on the circuit with some external clock. The phase-locked loop circuit realizes synchronization by comparing the phase of an external signal with the phase of a voltage controlled crystal oscillator (VCXO), and in the comparison process, the phase-locked loop circuit can continuously adjust the clock phase of a local crystal oscillator according to the phase of the external signal until the phases of the two signals are synchronized. The phase-locked loop is used for feedback technology in an oscillator. Many electronic devices normally operate by requiring an external input signal to be synchronized with an internal oscillating signal. The general crystal oscillator cannot achieve very high frequency due to the process and cost, and when high frequency application is needed, the corresponding voltage-controlled oscillator 221 realizes conversion into high frequency, but the high frequency is not stable, so that a stable and high-frequency clock signal can be realized by using a phase-locked loop.
It can be understood that the phase-locked loop is used to quickly synchronize to the corresponding receiving frequency band, such as 800MHZ, 900MHZ, 1800MHZ, 1900MHZ, 2100MHZ, 2300MHZ, 2600MHZ, etc., the switching of the phase-locked loop frequency band and the first rf switch 40 and the second rf switch 41 in the filtering module 4 are kept consistent, and the frequency band is switched to the same frequency band when being switched, so that the receiving module 1 can accurately receive the wireless signal of the corresponding frequency band.
In this embodiment, the baseband signal processing unit 21 may be specifically an FPGA, a plurality of shaping filters with different bandwidths and corresponding rate conversion modules are built in a program of the FPGA, the Digital signal passes through a Direct Digital Controller (DDC), and then identifies a communication system through signal characteristics, and transmits triangular waves with different frequencies in corresponding transmission channels according to different system conditions of a current network signal, so as to perform a shielding function. It can be understood that the optimal scanning frequency of the existing network signals of different systems is a priori knowledge, and may be stored in the baseband signal processing unit 21 in advance. In particular, the baseband signal processing unit 21 is further configured to dynamically adjust the starting boundary of the frequency sweep. Due to the fact that network deployment schedules of operators in all regions are inconsistent, the operators have large differences in the same frequency band, for example, old communication systems in economically developed regions are partially re-cultivated, and network deployment is not performed in less developed regions; when the device leaves the factory, the device is designed according to the maximum planned frequency band, therefore, when the baseband signal processing unit 21 works, the amplifier of the receiving unit 20 is coupled to the baseband, and the baseband signal processing unit 21 detects the output power of the channel to adjust the starting boundary of the frequency sweep frequency.
It is understood that the baseband signal processing unit 21 is configured to identify the start frequency and the cut-off frequency of the present network signal to adjust the mask signal boundary. Illustratively, the modulation filter 222 of the shielding signal generating unit 22 filters out spurs and harmonics generated by the frequency sweep of the voltage-controlled oscillator 221, because both the transition band of the board-level acoustic meter or the dielectric filter is wide, frequency sweep interference which cannot be suppressed by about 10MHz is generated on the frequency sweep boundary, and the uplink and downlink intervals between some operators are only 5MHz, such as the downlink frequency bands 869-880 MHz and the uplink frequency bands 885-915MHz, and the downlink frequency bands 1805-1880 MHz and the uplink frequency bands 1885-1920 MHz, so the boundary of the shielding signal needs to be precisely controlled. Specifically, for the existing network signals of Frequency Division Duplex (FDD) system and Time Division Duplex (TDD) system, the baseband signal processing unit 21 controls the digital-to-analog converter 220 to make the digital-to-analog converter 220 output a constant minimum level V1, at this Time, the voltage-controlled oscillator 221 outputs the minimum level of the corresponding Frequency band, and feeds back the minimum level to the baseband, the baseband compares the minimum level fed back by the feedback with the minimum level identified in the existing network signals to perform difference comparison, and adjusts the minimum level of the digital-to-analog converter 220 according to the difference until the fed back minimum level and the minimum level of the existing network signals are within a preset error range, so as to calibrate the low Frequency point boundary. Illustratively, the baseband signal processing unit 21 is further configured to control the digital-to-analog converter 220, so that the digital-to-analog converter 220 outputs a constant highest level V2, at this time, the voltage-controlled oscillator 221 outputs a highest level of a corresponding frequency band, and then feeds back the highest level to the baseband, the baseband compares the highest level fed back by the feedback with the highest level identified in the present network signal to perform a difference comparison, and then adjusts the highest level of the digital-to-analog converter 220 according to the difference until the highest level fed back and the highest level of the present network signal are within a preset error range, so as to calibrate the high frequency point boundary. In particular, if the masking signal is composed of a plurality of discrete bands, the start and end points of the intermediate band are also added to the dynamic calibration range. In addition, the timing cycle calibrates the sweep boundary so that the sweep source is synchronized to the local clock, and the local clock is synchronized to the base station, which is equivalent to the sweep source being indirectly synchronized to the base station. The control method solves the problems that the traditional shielding device is serious in temperature drift and the actual boundary is about 10M larger than the boundary of the frequency band to be shielded, and the frequency sweeping energy utilization rate is high due to intelligent identification of the current network condition, so that the interference efficiency is improved.
Illustratively, the baseband signal processing unit 21 is further configured to receive a mask signal modulated by the modulation signal, and adjust the modulation signal based on the mask signal to adjust the boundary of the mask signal. It is understood that the signal amplifier 224 is connected to the baseband signal processing unit at the same time, and sends the mask signal to the baseband signal processing unit, and the baseband signal processing unit 21 adjusts the modulation signal based on the mask signal to adjust the boundary of the mask signal. Specifically, the baseband signal processing unit 21 compares the actual boundary of the mask signal with the boundary of the base station signal analyzed by the receiving module 20, and the fine tuning dac 220 calibrates the deviation formed by the vco 221 according to the error.
illustratively, the baseband signal processing unit 21 is further configured to analyze a switch signal of an existing network signal of the tdd scheme, so that the shielding signal is sent when the existing network signal of the tdd scheme is downlink, so as to avoid affecting uplink of the base station.
And for the signals of the time division duplex system, a frequency error is obtained through analysis, and the frequency error is used for calibrating a local VCTCXO oscillator so as to synchronize a local clock to the base station.
Specifically, the baseband signal processing unit 21 calculates a direct frequency error between the local VCTCXO clock and the base station by analyzing the wireless signal, and then adjusts the voltage-controlled terminal of the VCTCXO by the internal voltage-adjusting circuit, so as to perform a periodic calibration operation, so that the device frequency and the base station are kept synchronized. Because the VCTCXO is a local reference clock of the equipment, the equipment can realize a precise and high-quality clock signal after being synchronized to the base station.
referring to fig. 6, fig. 6 is a schematic diagram of a mask signal generating unit 22 according to an embodiment of the invention. In this embodiment, the shielding signal generating unit 22 includes a digital-to-analog converter 220, a voltage-controlled oscillator 221, a modulation filter 222, and a modulation amplifier, where the digital-to-analog converter 220, the voltage-controlled oscillator 221, the modulation filter 222, and the modulation amplifier are sequentially connected, the digital-to-analog converter 220 is connected to the baseband signal processing unit 21, and the modulation amplifier is connected to the transmitting module. The digital-to-analog converter 220 converts the digital signal transmitted by the baseband signal processing unit 21 into an analog signal, i.e., a modulation waveform, generates a masking signal after being processed by the voltage-controlled oscillator 221, the modulation filter 222 and the modulation amplifier, and transmits the masking signal to the transmitting unit through the modulation amplifier. Illustratively, the modulation amplifier includes a digital variable gain amplifier 223 and a signal amplifier 224 for adjusting the strength of the masking signal according to the strength of the incumbent network signal. Specifically, the baseband signal processing unit 21 controls the digital-to-analog converter 220 to generate a corresponding waveform to control the voltage-controlled oscillator 221 to generate a corresponding waveform and boundary according to the system identification and the boundary identification.
Specifically, if there are existing network signals of multiple systems in the same frequency band, the digital-to-analog converter 220 outputs a modulation waveform for mixing processing. Referring to fig. 7, fig. 7 is a schematic diagram of frequency sweep control for existing network signals of different communication systems according to an embodiment of the present invention, in which a horizontal axis represents time, and a vertical axis represents amplitude, voltages V1 to V2 represent a frequency sweep process from a low frequency point to a high frequency in one system, voltages V2 to V3 represent a frequency sweep process from a low frequency point to a high frequency in another system, and a vertical axis can see frequency changes before and after the frequency sweep process.
It is understood that the masking signal generating unit 22 may include a plurality of masking channels, each of which includes a digital-to-analog converter 220, a voltage-controlled oscillator 221, a modulation filter 222, and a modulation amplifier, and may generate a masking signal for masking the existing network signals of different frequencies and different formats under the control of the controller.
Illustratively, the transmitting module includes a transmitting antenna array including downlinks of all operator frequency bands.
Referring to fig. 8, fig. 8 is a block diagram of a signal shielding device according to an embodiment of the present invention.
Unlike the previous embodiment, in the present embodiment, the shielding signal generating unit 22 includes two shielding channels, and can generate a shielding signal for shielding the existing network signals with different frequencies and different formats under the control of the controller. In other embodiments, the shielding signal generating unit may include a plurality of shielding channels.
In this embodiment, the modulation module 2 further includes a clock unit, and the clock unit is connected to the baseband signal processing unit and is configured to synchronize with a frequency of a digital signal in the baseband signal processing unit.
In this embodiment, the modulation module 2 further includes a monitoring unit, and the monitoring unit is connected to the receiving unit, the baseband signal processing unit, the shielding signal generating unit, and the clock unit, and is configured to monitor and debug the operation of the modulation module 2. It is understood that the monitoring unit may be an ARM processor, and may also be other processing chips.
Referring to fig. 9, fig. 9 is a networking topology diagram of a monitoring unit according to an embodiment of the present invention. Illustratively, the cloud server is connected with the switch through the internet, the switch is connected with the shielding device through the local area network, and the cloud server monitors the working condition of the shielding device through the switch.
The invention also discloses a signal shielding method which is applied to the signal shielding device.
Referring to fig. 10, fig. 10 is a schematic diagram illustrating a signal shielding method according to an embodiment of the invention.
in this embodiment, the signal shielding method includes:
Step 900, receiving a present network signal.
step 910, identifying a communication system, an initial frequency and a cut-off frequency of the existing network signal, and generating a modulation signal based on the existing network signal.
Specifically, the present network signal transmitted by the receiving module is received, and the communication system, the starting frequency and the cut-off frequency of the present network signal are identified, so as to modulate the shielding signal with the frequency and the boundary adapted to the present network signal.
Step 920, modulate a mask signal based on the modulation signal.
it can be understood that the shielding signal is adapted to the communication system, frequency and boundary of the existing network signal.
specifically, the modulating the mask signal based on the modulation signal includes: converting the modulation signal into an analog signal; adjusting a voltage of the analog signal; filtering the analog signal; and adjusting the strength of the analog signal to generate a shielding signal.
Step 930, transmitting the mask signal.
The signal shielding device and method comprise a receiving module 1, a modulating module 2 and a transmitting module 3, wherein: the receiving module 1 is used for receiving an existing network signal modulation module 2, is connected with the receiving module 1, and is used for receiving an existing network signal transmitted by the receiving module 1 and modulating a shielding signal based on a communication system of the existing network signal; and the transmitting module is connected with the modulating module 2 and used for transmitting the shielding signal, so that the shielding signal can be adjusted according to the change of the existing network signal, different shielding circuits do not need to be arranged aiming at the existing network signals of different systems, the shielding efficiency is higher, and the cost is lower. Meanwhile, the signal shielding device can circularly analyze and refresh the TDD switch, and the analyzed TDD switch is used as an enabling switch signal of the corresponding TDD interference channel so as to switch off the uplink of the corresponding TDD channel in a TDD frequency band and avoid interference with the base station of an operator. And the sweep frequency boundary of the signal shielding device is accurate, the sweep frequency signal can be prevented from falling into an uplink band, the utilization rate of sweep frequency energy is high, and the interference efficiency is improved to a certain extent. In addition, the signal shielding device utilizes a feedback link to calibrate the sweep frequency boundary in the FPGA at regular time, so that the problem of overlarge temperature drift of the voltage-controlled oscillator 221 is solved. Meanwhile, each transmitting channel of the signal shielding device is dynamically adjusted by the DVGA, and the shielding effect boundary can be reasonably controlled according to the signal intensity of the current network and the strength of the current network.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (19)
1. The utility model provides a signal shielding device, its characterized in that, signal shielding device includes receiving module, modulation module and emission module, receiving module, modulation module and emission module link to each other in proper order, wherein:
The receiving module is used for receiving the current network signal;
the modulation module is used for receiving the current network signal transmitted by the receiving module and modulating the shielding signal based on the communication system of the current network signal; the communication system modulation shielding signal based on the existing network signal also comprises the steps of identifying the existing network signal system, generating corresponding modulation signals aiming at different existing network signal systems based on the prior knowledge with the optimal sweep frequency interference effect, and generating shielding signals based on the modulation signals;
And the transmitting module is used for transmitting the shielding signal.
2. The signal shielding device according to claim 1, wherein the modulation module includes a receiving unit, a baseband signal processing unit, and a shielding signal generating unit, wherein the receiving unit is connected to the receiving module, the receiving unit, the baseband signal processing unit, and the shielding signal generating unit are sequentially connected to each other, the shielding signal generating unit is connected to the transmitting module, the receiving unit is configured to receive a present network signal transmitted by the receiving module and convert the present network signal into a digital signal, the baseband signal processing unit receives the digital signal and generates a modulation signal based on the digital signal, and the shielding signal generating unit is configured to modulate a shielding signal based on the modulation signal and transmit the shielding signal to the transmitting module.
3. the signal masking apparatus of claim 2, wherein the baseband signal processing unit is further configured to identify a start frequency and a cut-off frequency of the incumbent signal to adjust the masking signal boundary.
4. The signal masking apparatus as claimed in claim 3, wherein said baseband signal processing signal is further configured to adjust the boundary of said masking signal and the start frequency and the cut-off frequency of the middle frequency band for a masking signal consisting of a plurality of discontinuous frequency bands.
5. The signal shielding apparatus according to claim 3 or 4, wherein the shielding signal generating unit includes a digital-to-analog converter, a voltage-controlled oscillator, a modulation filter, and a modulation amplifier, the digital-to-analog converter, the voltage-controlled oscillator, the modulation filter, and the modulation amplifier are sequentially connected, the digital-to-analog converter is connected to the baseband signal processing unit, the modulation amplifier is connected to the transmitting module, and the baseband signal processing unit controls the digital-to-analog converter to generate a corresponding waveform to control the voltage-controlled oscillator to generate a corresponding waveform and boundary based on the format and boundary of the existing network signal, and generates the shielding signal after the waveform is processed by the modulation filter and the modulation amplifier.
6. The signal masking apparatus of claim 4, wherein the baseband signal processing unit is further configured to receive a masking signal modulated by the modulation signal and adjust the modulation signal based on the masking signal to adjust the boundary of the masking signal.
7. The signal masking apparatus of claim 6, wherein the baseband signal processing unit compares the boundary of the masking signal with the boundary of the present net signal, and adjusts the output waveform of the digital-to-analog converter according to the error to adjust the boundary of the masking signal, thereby calibrating the error formed by the voltage-controlled oscillator.
8. The signal shielding apparatus as claimed in claim 6 or 7, wherein the baseband signal processing unit is further configured to analyze a switching signal of an existing network signal of the time division duplex system, so that the shielding signal is transmitted when the existing network signal of the time division duplex system is downstream.
9. The signal shielding apparatus of claim 2, wherein the receiving unit comprises a receiving amplifier, a mixer, a receiving filter, and an analog-to-digital converter, the receiving amplifier, the mixer, the receiving filter, and the analog-to-digital converter are connected in sequence, the receiving amplifier is connected to the receiving module, the analog-to-digital converter is connected to the baseband signal processing unit, and the mixer comprises a phase-locked loop.
10. The signal shielding apparatus of claim 9, further comprising a filtering module, disposed between the receiving module and the modulating module, for respectively filtering the present network signals in different frequency bands.
11. the signal shielding device according to claim 10, wherein the filtering module comprises a first rf switch, a second rf switch and a filtering structure, the first rf switch, the filtering structure and the second rf switch are sequentially connected, the first rf switch is connected to the receiving module, the second rf switch is connected to the modulating module, and the first rf switch and the second rf switch are synchronously switched to the same frequency band.
12. the signal shielding device of claim 11, wherein the filtering structure comprises at least one filtering unit, and frequency ranges covered by the filtering units are not overlapped; the filtering structure traverses all frequency bands through time-sharing switching, and acquires and analyzes the existing network signals.
13. The signal shielding apparatus of claim 11, wherein the first rf switch and the second rf switch are consistent with switching of the frequency band of the pll loop.
14. the signal shielding apparatus of claim 2, wherein the modulation module further comprises a monitoring unit, and the monitoring unit is connected to the baseband signal processing unit and configured to monitor an operating condition of the modulation module.
15. The signal shielding apparatus of claim 2, wherein the modulation module further comprises a clock unit, and the clock unit is connected to the baseband signal processing unit and is configured to synchronize with a frequency of the digital signal in the baseband signal processing unit.
16. The signal masking apparatus of claim 15, wherein the baseband signal processing unit is further configured to resolve a frequency error of a time division duplex system to synchronize the clock unit to a base station.
17. The signal masking apparatus of claim 1, wherein said modulation module further comprises a digital variable gain amplifier for adjusting the strength of said masking signal based on the strength of said incumbent network signal.
18. A signal shielding method applied to the signal shielding apparatus according to any one of claims 1 to 17, the method comprising:
Receiving a present network signal;
identifying a communication system, an initial frequency and a cut-off frequency of the existing network signal, and generating a modulation signal based on the existing network signal;
modulating a masking signal based on the modulation signal;
And transmitting the shielding signal.
19. The signal masking method of claim 18, wherein said modulating a masking signal based on said modulated signal comprises:
Converting the modulation signal into an analog signal;
Adjusting a voltage of the analog signal;
Filtering the analog signal;
and adjusting the strength of the analog signal to generate a shielding signal.
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| CN201910868905.3A CN110572235B (en) | 2019-09-16 | 2019-09-16 | Signal shielding device and method |
| PCT/CN2020/087957 WO2021051821A1 (en) | 2019-09-16 | 2020-04-30 | Signal shielding device and method |
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| CN116192326A (en) * | 2023-03-22 | 2023-05-30 | 天津安力信通讯科技有限公司 | Method and system for shielding mobile communication signals |
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| WO2021051821A1 (en) | 2021-03-25 |
| CN110572235B (en) | 2022-07-08 |
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