CN109995460A - Shield device, signal shielding method, equipment and medium - Google Patents
Shield device, signal shielding method, equipment and medium Download PDFInfo
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- CN109995460A CN109995460A CN201711494768.9A CN201711494768A CN109995460A CN 109995460 A CN109995460 A CN 109995460A CN 201711494768 A CN201711494768 A CN 201711494768A CN 109995460 A CN109995460 A CN 109995460A
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- signal
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- force ratio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
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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
Abstract
The invention discloses a kind of shielding device, signal shielding method, equipment and media.The shielding device includes: receives link, is converted to digital signal for receiving the downlink signal of base station, and by the downlink signal；Signal processing link, the digital signal for being exported to the receives link parse, and generate shielded signal, and the shielded signal is carried out peak-to-average force ratio reduction and digital pre-distortion processing；Emit link, for the shielded signal that peak-to-average force ratio reduces and digital pre-distortion is handled to be carried out signal modulation, completes the conversion of digital signal to analog signal, and exported.Shielding device in the embodiment of the present invention enables to the spuious of amplified shielded signal largely to reduce.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of shielding device, signal shielding method, calculate equipment and calculating
Machine readable storage medium storing program for executing.
Background technique
Existing mobile phone wireless signal shielding scheme is mainly taken power drawing method to realize signal shielding, is solved at present
Scheme is mainly single standard signal interference Shielding plan and Combined type mobile phone signal interference Shielding plan.Interference shielding scheme by
Interference signal generates, interference signal is amplified, interference signal transmitting composition.
Single standard signal interference Shielding plan, including power supply, interference unit and antenna, interference unit one end and the power supply connect
It connects, the other end is connect with the antenna, inside sets independent signal transmitting module, the frequency of each independent signal transmitting module transmitted wave
Rate is all different and matches corresponding antenna.Independent signal transmitting module includes triangular-wave generator, voltage controlled oscillator and power
Amplifier voltage controlled oscillator one end is connect with triangular-wave generator, and the other end is connect with power amplifier.The triangular wave hair
Contain chip in raw device, the amplification chip of low output power is provided in power amplifier.
Pressing type interference circuit and sweep-frequency Békésy audiometer are interfered electricity by RF switch by the dry Shielding plan of Combined type mobile phone signal
Road generates two different signals and alternately sends, and replaces two paths of signals quickly and is emitted in three-dimensional space to interfere respective tones
The mobile phone signal of section；The white noise signal that wherein signal generates noise signal generator all the way is after filtering, then through power
Amplification, then and local oscillator unit generate local oscillation signal upconverted to it is identical as the mobile phone signal frequency range for needing to interfere；Separately
White noise signal is modulated sawtooth voltage and increases the amplitude of signal after output modulation by interference signal all the way, after then modulating
Sawtooth voltage tuning voltage controlled oscillator obtain signal identical with the mobile phone signal frequency range interfered of needs.Pass through radio frequency high speed
Switch jointly interferes communications band from the interference standard that sweep-frequency Békésy audiometer interferes both different using pressing type.
But inventors have found that existing single standard signal interference device and Combined type mobile phone signal interference device are in the presence of as follows
Disadvantage:
Single standard signal interference device interferes mobile phone signal using swept-frequency signal interference, but due to saw
Tooth wave is mainly to be generated by the charge-discharge circuit of capacitor, and frequency sweep cycle is not achieved sufficiently small, will cause noise spectrum density
Not high enough, there are interference blind spot, interference effect is poor, it is difficult to meet the occasion for having strict supervision requirement to mobile phone.In addition, using
The mode of power compacting realizes function of shielding, and module spuious is unable to control to what base station generated.
Combined type mobile phone signal interference device interferes both different using pressing type by radio frequency high-speed switch from sweep-frequency Békésy audiometer
Interference standard communications band is interfered jointly.The non-linear of power amplifier will form intermodulation and Intermodulation Interference, generate
Unnecessary frequency component causes distortion and the band stray of inband signaling, and the spuious of downstream screens signal is caused to produce base station
Raw uplink interference, seriously affects network quality.
Summary of the invention
The embodiment of the invention provides a kind of shielding device, signal shielding method, calculate equipment and computer-readable storage medium
Matter is able to solve above-mentioned existing single standard signal interference device and Combined type mobile phone signal interference device
At least one of.
In a first aspect, the embodiment of the invention provides a kind of shielding devices, comprising:
Receives link is converted to digital signal for receiving the downlink signal of base station, and by the downlink signal；
Signal processing link, the digital signal for being exported to the receives link parse, and generate shielded signal,
And the shielded signal is subjected to peak-to-average force ratio reduction and digital pre-distortion processing；
Emit link, it is complete for the shielded signal that peak-to-average force ratio reduces and digital pre-distortion is handled to be carried out signal modulation
At the conversion of digital signal to analog signal, and exported.
Preferably, the receives link includes:
Receiving module, for receiving the downlink signal of base station；
Frequency mixer, for by the receiving module the downlink signal of received base station be mixed；
Filter, for the downlink signal of the base station after mixing to be filtered；
Analog-digital converter, for the downlink signal of filtered base station to be converted to digital signal.
Preferably, the signal processing link includes:
Shielded signal generation module, the digital signal parsing for exporting to the receives link, generates shielding letter
Number；
Peak-to-average force ratio reduces module, for reducing the peak-to-average force ratio of the shielded signal；
Digital pre-distortion block, the shielded signal for reducing peak-to-average force ratio carries out pre-distortion, with control pair
Base station generates spuious.
It may further be preferable that the shielded signal generation module includes:
Base station signaling resolution unit, parses for the downlink signal to base station, obtains signaling information；
Shielded signal generation unit, for forming the shielded signal for being directed to signaling according to the signaling information parsed.
It may further be preferable that the peak-to-average force ratio for the shielded signal that the shielded signal generation unit generates is 10dB.
It may further be preferable that the peak-to-average force ratio reduces module, comprising:
The peak value of peak detection unit, the shielded signal for generating to the shielded signal generation module detects,
Obtain peak signal；
Pulsed filter offsets signal for basis and the peak signal carries out pulse and offsets, to reduce the shielding
The peak value of signal；
Delay circuit, for carrying out delay process to the signal for being input to the peak detection block.
It may further be preferable that the peak-to-average force ratio of the shielded signal of the pulsed filter output is 6dB.
It may further be preferable that the digital pre-distortion block includes: digital pre-distortion filter.
It may further be preferable that the transmitting link includes: power amplifier, for will be used for will be after pre-distortion
Shielded signal amplifies.
It may further be preferable that the shielding device further include: computing module, for being reduced according to the peak-to-average force ratio of acquisition
It is pre- to calculate the number by preset algorithm for the shielded signal of module output and the shielded signal of power amplifier output
The filter factor of distortion filter.
It may further be preferable that the preset algorithm is least-squares algorithm.
Due to the signal processing link in the shielding device in the embodiment of the present invention, shielded signal is being input to transmitting link
Before amplifying, peak-to-average force ratio reduction and digital pre-distortion have been carried out to shielded signal, shielded signal is being inputted into transmitting later
Module amplifies, therefore, so that the spuious of amplified shielded signal can be reduced largely.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the structural schematic diagram of the shielding device in one embodiment of the present of invention；
Fig. 2 is the schematic diagram of the receives link of the shielding device in another embodiment of the present invention；
Fig. 3 is the schematic diagram of the signal processing link of the shielding device in another embodiment of the present invention；
Fig. 4 is the knot of the shielded signal generation module of the signal processing link of the shielding device in another embodiment of the present invention
Structure schematic diagram；
Fig. 5 is that the peak-to-average force ratio of the signal processing link of the shielding device in another embodiment of the present invention reduces the structure of module
Schematic diagram；
Fig. 6 is the structure of the digital pre-distortion block of the signal processing link of the shielding device in another embodiment of the present invention
Schematic diagram.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case where not needing some details in these details
It applies.Below the description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
As shown in connection with fig. 1, the embodiment of the invention provides a kind of novel shielding devices of efficient power amplifier technology, comprising: receives
Link, signal processing link, transmitting link.Wherein, receives link is used to receive the downlink signal of base station, and by the downlink signal
Be converted to digital signal；The digital signal that signal processing link is used to export the receives link parses, and generates screen
Signal is covered, and the shielded signal is subjected to peak-to-average force ratio (CFR) reduction and digital pre-distortion (DPD) processing；Emit link to use
In the shielded signal that peak-to-average force ratio reduces and digital pre-distortion is handled is carried out signal modulation (namely signal amplification), number is completed
Word signal and is exported to the conversion of analog signal.
By the signal processing link in shielding device in this present embodiment, carried out shielded signal is input to transmitting link
Before amplification, peak-to-average force ratio reduction and digital pre-distortion are carried out to shielded signal, shielded signal is being inputted into transmitting module later
It amplifies, therefore, so that the spuious of amplified shielded signal can be reduced largely.
In conjunction with shown in Fig. 1-6, the embodiment of the present invention provides a kind of novel shielding device of efficient power amplifier technology, with embodiment 1
It is identical to be, device is shielded in the present embodiment equally to be included: receives link, signal processing link, emit link, and specifically,
Receives link in the present embodiment includes: receiving module, frequency mixer, filter, analog-digital converter；Signal processing link includes:
Shielded signal generation module, peak-to-average force ratio reduce module, digital pre-distortion block；Emitting link includes: power amplifier module.It carries out below
It illustrates.
1, receives link
Specifically, as shown in Fig. 2, receives link includes: receiving module, frequency mixer, filter, analog-digital converter.
Wherein, receiving module is used to receive the downlink signal of base station；Frequency mixer is used for the receiving module institute is received
The downlink signal of base station is mixed；Filter is used to for the downlink signal of the base station after mixing being filtered；Analog-digital converter
Downlink signal for filtered base station is converted to digital signal.
That is, the downlink signal to receive base station of the receives link in the present embodiment, and pass through mixing, filtering
Signal is changed into the digital signal of base band by device and analog-to-digital conversion.
2, signal processing link
Specifically, as shown in figure 3, signal processing link includes: shielded signal generation module, peak-to-average force ratio reduction module, number
Word predistortion module.
Wherein, the digital signal that shielded signal generation module is used to export the receives link parses, and generates screen
Cover signal.
As shown in figure 4, the shielded signal generation module preferably includes: that base station signaling resolution unit and shielded signal generate
Unit.Wherein, signaling resolution unit in base station is used to parse the downlink signal of base station, obtains the uplink and downlink timeslot of TDD radio frames,
The information such as PSS, SSS, PBCH；Shielded signal generation unit, according to the signaling information of parsing, the shielding formed for signaling is believed
Number；The jamming performance of the shielded signal is good, but has higher peak-to-average force ratio, and the peak-to-average force ratio (PAR) of the preferred shielded signal is
10dB。
Wherein, peak-to-average force ratio reduces module and is used to reduce the peak-to-average force ratio of shielded signal.The peak-to-average force ratio reduces what module used
It is the peak-to-average force ratio reduction technology that pulse offsets, by a pulsed filter for offseting, which will meet band simultaneously
Outer rejection ability and inband flatness followed by find the peak fractions of signal, the peak signal be exactly finally generate it is spuious
Signal, with the peak signal, subtract it is designed offset signal, just obtain the signal that a peak value becomes smaller.
Peak-to-average force ratio employed in the present embodiment reduces the basic principle that module uses peak value to offset, in the base for reducing peak-to-average force ratio
On plinth, processed shielded signal quality (EVM) damage is minimum, and after peak-to-average force ratio reduces, the peak-to-average force ratio of shielded signal is
6dB, namely reduce 4dB.
It is preferably included as shown in figure 5, the peak-to-average force ratio reduces module: peak detection unit, pulsed filter, delay circuit.
Wherein, the peak value for the shielded signal that peak detection unit is used to generate the shielded signal generation module is examined
It surveys, obtains peak signal.
Specifically, peak detection unit main function is to find out to need reduced peak value, the signal of input be I/Q (same to phase/
It is orthogonal), it needs first to be converted to amplitude/phase signal, can just compare peak value.The characteristics of peak value be signal value before this all
Smaller than the peak value, signal value after this is also all smaller than the peak value, meets the condition, can be defined as peak value Peak.
Another parameter is threshold value, according to peak-to-average force ratio reduction target to be achieved is thought, corresponding range value is calculated, as reduction
Thresholding Thr, that is to say, that the difference of Peak and Thr as offsets the size Phy of pulse.
Wherein, pulsed filter offsets signal for basis and the peak signal carries out pulse and offsets, described in reducing
The peak value of shielded signal.
Specifically, pulsed filter, which is one, offsets pulsed filter, filter coefficient bilateral symmetry, and by normalizing
Change, namely most intermediate one (odd number term coefficient) is 1, or most intermediate two (even number term coefficient) are respectively 0.5.Offset arteries and veins
Size Phy is rushed to be multiplied with the filter coefficient to get to offseting pulse train.Many times have multiple peak value needs to offset, respectively
It is added from pulse train is offseted, obtains total offseting pulse train.
The spectral shape of the downlink of the coefficient and base station of the pulsed filter has relationship, basic to realize that step is, using pair
Disappear pulsed filter, and passband is determined according to the bandwidth of shielded signal, and stopband is determined according to the bandwidth that do spurious reduction
It is fixed.
Wherein, delay circuit is used to carry out delay process to the signal for being input to the peak detection block.
Why in the present embodiment peak-to-average force ratio reduces module increase delay circuit, is because cancellation process needs to offset arteries and veins
Sequence and peak value close alignment to be offseted are rushed, therefore delay disposal is done to the signal of input, therefore increases delay circuit.
3, digital pre-distortion block
Specifically, pre-distortion technology of the digital pre-distortion block using open loop, is filtered by a digital pre-distortion
Device, shielded signal are fed to power amplifier after the filter.
Wherein, as shown in fig. 6, digital pre-distortion block is a digital predistortion filter.Digital pre-distortion is filtered
It further includes a computing module that the coefficient of wave device, which is set in the present embodiment, defeated for reducing module according to the peak-to-average force ratio of acquisition
The shielded signal of shielded signal and power amplifier output out, calculates the digital pre-distortion by preset algorithm and filters
The filter factor of wave device.Preset algorithm is preferably least-squares algorithm.Such as: the filter coefficient of digital pre-distortion filter is logical
Over-fitting obtains, and samples power amplifier output signal S1, digital pre-distortion filter input signal is S2, according to least square method (LS)
Criterion adjusts filter coefficient, keeps the difference of S1 and S2 minimum.
Wherein, in shielding only one digital pre-distortion filter of device, (power amplifier is not included in number as shown in Figure 6
It is simulation process part in predistortion module), to obtain the coefficient of digital pre-distortion filter, need to use power amplifier
Output signal S1 acquires link sum number word predistorted input signal S2 and acquires link, passes through the MATLAB program in PC machine, operation
It obtains the coefficient C1 of digital pre-distortion filter, and is written in shielding device.
Below to shown in fig. 6, the setting of digital pre-distortion filter is specifically described.
Wherein, digital pre-distortion filter is a kind of special filter.First dimensional representation is non-linear, the shielding device item
It is non-linear for 5 ranks in mesh, for eliminating neighboring trace and every the spuious of road.Second each dimensional representation memory effect, for broadband signal,
Power amplifier has memory effect, to obtain better spuious eradicating efficacy, it is necessary to do respective handling to memory effect.For Novel screen
It covers the cost and volume requirement of device, the calculating of filter coefficient and is updated to processed offline, before equipment factory, store up in equipment
Portion.Therefore, which is a kind of open loop predistortion, has the advantage of low cost and small size.
Whether the output of power amplifier output signal S1 acquisition link observation power amplifier obtains spuious optimization.The novel shielding
Device is acquired using Agilent frequency spectrograph N9030, and the signal of power amplifier output is input to frequency spectrum with feeder line after 40dB attenuator
The measuring mouth of instrument.By being appropriately arranged with frequency spectrograph, 10ms data are acquired, and import the workspace of the matlab simulation software of PC machine
It is interior.
The input signal S2 acquisition link of digital pre-distortion filter is for comparing, by the jtag interface of FPGA,
10ms data are downloaded, and are imported in the workspace of matlab simulation software of PC machine.
The matlab of PC machine is emulated, the digital pre-distortion algorithm that operation optimizes for shielded signal, using least square method
Criterion calculates digital pre-distortion filter coefficient.It is this in order to follow since the characteristic of power amplifier can change with temperature
Variation needs a plurality of sets of filter coefficients, corresponding different environment temperature.
The filter of the present embodiment reduces (CFR) and digital pre-distortion (DPD) by joint peak-to-average force ratio, and uplink is spuious can
Optimize 20dB or more.Solve interference of the interference unit to uplink.
3, emit link
Specifically, transmitting link completes the transformation of digital signal to analog signal by signal modulation.In addition, the efficient function
The novel shielding device transmitting link of discharge technique includes power amplifier module namely power amplifier, has power amplification function, power amplifier
Using Doherty technology, efficiency with higher.
An alternative embodiment of the invention additionally provides a kind of signal shielding method.This method may include: to receive base station
Downlink signal, and the downlink signal is converted into digital signal；The digital signal exported to the receives link solves
Analysis generates shielded signal, and the shielded signal is carried out peak-to-average force ratio reduction and digital pre-distortion processing；Peak-to-average force ratio is dropped
The shielded signal of low and digital pre-distortion processing carries out signal modulation, completes digital signal to the conversion of analog signal, goes forward side by side
Row output.
In the another alternative embodiment of the present invention, a kind of calculating equipment is additionally provided, comprising: at least one processor, extremely
A few memory and computer program instructions stored in memory, when computer program instructions are executed by processor
The signal shielding method provided in above-described embodiment is provided.
In the another alternative embodiment of the present invention, a kind of computer readable storage medium is additionally provided, meter is stored thereon with
Calculation machine program instruction, the signal shielding side provided in above-described embodiment is realized when computer program instructions are executed by processor
Method.
Novel shielding device, method, equipment and Jie of efficient power amplifier technology provided in the above-mentioned each embodiment of the present invention
Matter is completed the shielded signal based on signaling by signal processing link, is completed with lower power to the accurate of each standard signal
Shielding.And use digital solutions, the peak-to-average force ratio reduction technology and open loop digital pre-distortion skill that joint pulse offsets
Art, the power amplifier being used cooperatively efficiently inhibit band stray, successfully solve the problems, such as interference unit to the uplink interference of base station.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (13)
1. a kind of shielding device characterized by comprising
Receives link is converted to digital signal for receiving the downlink signal of base station, and by the downlink signal；
Signal processing link, the digital signal for being exported to the receives link parse, and generate shielded signal, and will
The shielded signal carries out peak-to-average force ratio reduction and digital pre-distortion processing；
Emit link, for the shielded signal that peak-to-average force ratio reduces and digital pre-distortion is handled to be carried out signal modulation, completes number
Word signal and is exported to the conversion of analog signal.
2. shielding device according to claim 1, which is characterized in that the receives link includes:
Receiving module, for receiving the downlink signal of base station；
Frequency mixer, for by the receiving module the downlink signal of received base station be mixed；
Filter, for the downlink signal of the base station after mixing to be filtered；
Analog-digital converter, for the downlink signal of filtered base station to be converted to digital signal.
3. shielding device according to claim 1, which is characterized in that the signal processing link includes:
Shielded signal generation module, the digital signal parsing for exporting to the receives link, generates shielded signal；
Peak-to-average force ratio reduces module, for reducing the peak-to-average force ratio of the shielded signal；
Digital pre-distortion block, the shielded signal for reducing peak-to-average force ratio carry out pre-distortion, to control to base station
What is generated is spuious.
4. shielding device according to claim 3, which is characterized in that the shielded signal generation module includes:
Base station signaling resolution unit, parses for the downlink signal to base station, obtains signaling information；
Shielded signal generation unit, for forming the shielded signal for being directed to signaling according to the signaling information parsed.
5. shielding device according to claim 4, which is characterized in that the shielded signal that the shielded signal generation unit generates
Peak-to-average force ratio be 10dB.
6. shielding device according to claim 3, which is characterized in that the peak-to-average force ratio reduces module, comprising:
The peak value of peak detection unit, the shielded signal for generating to the shielded signal generation module detects, and obtains
Peak signal；
Pulsed filter offsets signal for basis and the peak signal carries out pulse and offsets, to reduce the shielded signal
Peak value；
Delay circuit, for carrying out delay process to the signal for being input to the peak detection block.
7. shielding device according to claim 6, which is characterized in that the peak of the shielded signal of the pulsed filter output is equal
Than for 6dB.
8. shielding device according to claim 7, which is characterized in that the transmitting link includes: power amplifier, and being used for will
Shielded signal after pre-distortion amplifies.
9. shielding device according to claim 8, which is characterized in that further include: computing module, for according to acquisition
Peak-to-average force ratio reduces the shielded signal of module output and the shielded signal of power amplifier output, is calculated by preset algorithm
The filter factor of the digital pre-distortion filter.
10. shielding device according to claim 9, which is characterized in that the preset algorithm is least-squares algorithm.
11. a kind of signal shielding method, which is characterized in that this method comprises:
The downlink signal of base station is received, and the downlink signal is converted into digital signal；
The digital signal exported to the receives link parses, and generates shielded signal, and the shielded signal is carried out
Peak-to-average force ratio reduces and digital pre-distortion processing；
Peak-to-average force ratio is reduced and the shielded signal of digital pre-distortion processing carries out signal modulation, completes digital signal to simulation
The conversion of signal, and exported.
12. a kind of calculating equipment characterized by comprising at least one processor, at least one processor and be stored in institute
The computer program instructions in memory are stated, are realized when the computer program instructions are executed by the processor as right is wanted
Method described in asking 11.
13. a kind of computer readable storage medium, is stored thereon with computer program instructions, which is characterized in that when the calculating
Machine program instruction realizes method as claimed in claim 11 when being executed by processor.
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| CN201711494768.9A CN109995460A (en) | 2017-12-31 | 2017-12-31 | Shield device, signal shielding method, equipment and medium |
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| CN111211861A (en) * | 2020-01-19 | 2020-05-29 | 成都立鑫新技术科技有限公司 | Signal interference method of mobile terminal |
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| US20130279629A1 (en) * | 2012-04-23 | 2013-10-24 | Cambridge Silicon Radio Limited | Transmitter |
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| CN103401513A (en) * | 2013-08-02 | 2013-11-20 | 武汉邮电科学研究院 | Digital pre-distortion processing method and device for power amplifier |
| CN107359957A (en) * | 2017-05-18 | 2017-11-17 | 杭州柏乐尼通信设备有限公司 | Cellular phone signal shielding device |
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| CN111211861A (en) * | 2020-01-19 | 2020-05-29 | 成都立鑫新技术科技有限公司 | Signal interference method of mobile terminal |
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