CN103595497B - A kind of employing postpones to forward the system and method realizing mobile phone signal shielding - Google Patents
A kind of employing postpones to forward the system and method realizing mobile phone signal shielding Download PDFInfo
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- CN103595497B CN103595497B CN201310596518.1A CN201310596518A CN103595497B CN 103595497 B CN103595497 B CN 103595497B CN 201310596518 A CN201310596518 A CN 201310596518A CN 103595497 B CN103595497 B CN 103595497B
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Abstract
The invention discloses a kind of employing to postpone to forward the system and method realizing mobile phone signal shielding, including reception antenna, transmission antenna, power amplifier, LNA module, frequency mixing module, analog-to-digital conversion module, D/A converter module and on-site programmable gate array FPGA, to signal lag one frame (or the N frame) amplification forwarding afterwards received.Owing to forward signal is that frame aligns, frequency is identical and modulation technique is identical with the normal signal that covers, using self-interference to make for the most inoperative to the link enhancement techniques of jamproof mobile communication cleverly, the signal reaching to repeat to send can realize the purpose effectively shielded more than primary signal.Due to the signal that the most neighbouring mobile phone can receive of the signal at reception antenna, so the present invention can shield all standard aerial signals received, to various standard (GSM, CDMA, WCDMA, TD-SCDMA, TD-LTE, FDD-LTE) present invention can be suitable for.
Description
Technical field
The present invention relates to the mobile phone signal shielding system of moving communicating field, more specifically, it relates to a kind of employing and postpones to forward realization
The system and method for mobile phone signal shielding.
Background technology
Mobile phone signal shielding system is mainly for all kinds of examination halls, school, gas station, church, court, library, conference centre
(room), cinema, hospital, government, finance, prison, public security, place of military importance etc. prohibit the use of the place of mobile phone.Mobile logical
Letter covers signal and there are the complex situations of multi-standard, multiple cell, multicarrier etc., and traditional mobile phone signal shielding technology uses big merit
Rate or employing pseudo-base station reach the purpose of shielding.
For using powerful mode, it is such as 21db for WCDMA system spreading gain, then traditional is high-power
WCDMA mobile phone signal shielding technology needs to send the mesh that can be only achieved effectively shielding more than the shielded signal of normal signal 21db
, not only power consumption is big, and radiation is big, big to human body animal injury, and base station can produce the consequences such as interference.And for adopting
By the mode of pseudo-base station, system complex volume is big, it is achieved relatively costly, it has not been convenient to the use in some place.
Summary of the invention
It is an object of the invention to overcome deficiency of the prior art, it is provided that a kind of employing postpones to forward the system realizing mobile phone signal shielding
And method.
It is an object of the invention to be achieved through the following technical solutions.This employing postpones to forward the system realizing mobile phone signal shielding,
This system includes reception antenna, transmission antenna, power amplifier, LNA module, frequency mixing module, analog-to-digital conversion module, digital-to-analogue conversion
Module and on-site programmable gate array FPGA, receive link: reception antenna receives aerial mobile communication wireless signal, passes through
LNA module is downconverted into analog if signal through frequency mixing module after being amplified signal, becomes numeral through AD sampling
Give after intermediate-freuqncy signal after the DDC module within FPGA, FPGA carries out digital mixing and extraction to signal and become zero intermediate frequency
The digital signal of low rate, be then passed to the ram memory cell within FPGA and carry out signal storage；Send link: FPGA
Internal ram memory cell signal exports to be given DA after carrying out Interpolation of signals and digital mixing to DUC module and is converted into simulation
Intermediate-freuqncy signal, through frequency mixing module become radiofrequency signal through power amplifier to signal amplify after by transmission antenna launch aerial；
FPGA is used for carrying out signal sampling rate conversion and signal lag, is the system of Ams for frame length, to the signal lag received
Send after the time of one frame or N frame.
The frame time length of the communication system of different systems is different, and the time catch cropping of time delay changes accordingly.
This implementation method using delay to forward the system realizing mobile phone signal shielding, utilizes reception antenna to connect aerial signal, prolongs
Time one frame or N frame time after sent by transmission antenna, forward signal with normal cover signal be frame align, frequency phase
With and modulation technique identical.
The invention has the beneficial effects as follows: due to retransmit signal and normally cover signal be frame align, frequency identical and modulation skill
Art is identical, uses self-interference to make cleverly, for the most inoperative to the link enhancement techniques of jamproof mobile communication, to reach
The signal sent can realize the purpose effectively shielded more than primary signal.It is taken from dual-mode antenna, the letter at antenna owing to receiving
The signal that near number the most namely, mobile phone can receive, so the present invention can shield all standard aerial signals received,
Various standards (GSM, CDMA, WCDMA, TD-SCDMA, TD-LTE, the FDD-LTE) present invention can be fitted
With.The realization of native system is simple, and cost is relatively low, and shield effectiveness is good, can use with commercialization large-scale popularization.
Accompanying drawing explanation
Fig. 1 is the system schematic of the present invention；
Fig. 2 is the present invention schematic diagram to forwarding after signal lag one frame；
Detailed description of the invention
With embodiment, the present invention is described further below in conjunction with the accompanying drawings.
Fig. 1 is the schematic diagram that present system realizes.This employing postpones to forward the system realizing mobile phone signal shielding, this system
Including reception antenna, transmission antenna, power amplifier, LNA module, frequency mixing module, analog-to-digital conversion module, D/A converter module and
On-site programmable gate array FPGA, receives link: reception antenna receives aerial mobile communication wireless signal, passes through LNA
Module is downconverted into analog if signal through frequency mixing module after being amplified signal, becomes digital intermediate frequency letter through AD sampling
The low speed becoming zero intermediate frequency after the DDC module within FPGA, FPGA carries out digital mixing and extraction to signal is given after number
The digital signal of rate, is then passed to the ram memory cell within FPGA and carries out signal storage；Send link: inside FPGA
Ram memory cell signal export carry out Interpolation of signals and digital mixing to DUC module after give DA and be converted into analog intermediate frequency
Signal, through frequency mixing module become radiofrequency signal through power amplifier to signal amplify after by transmission antenna launch aerial；FPGA
For carrying out signal sampling rate conversion and signal lag, be the system of Ams for frame length, to signal lag one frame received or
Sending after the time of person's N frame, the frame time length of the communication system of different systems is different, and the time catch cropping of time delay changes accordingly.
As in figure 2 it is shown, be the WCDMA system of 10ms such as frame length, send after the signal lag 10ms received.
Due to identical with the signal frequency that current base station is launched, modulating mode (spread spectrum, spread spectrum code and spread spectrum code phase) phase
With, mobile phone receives after two kinds of signals (shielded signal and base station signal) process simultaneously and is added, if the shielded signal of our transmitting
More than the signal (test for WCDMA system and prove greatly and equal to 3dB) of base station, mobile phone demodulation obtains signal just as shield
The energy covering signal can not correctly demodulate base station signal more than the signal of base station, reaches shield effectiveness.
System identical to multiple communication standard processing method (having only to adjust frame time length), can be with mutli-system integration.For frequency
Division duplex system shields after only forwarding downstream signal time delay, and for TDD system, due to time delay one frame, shielded signal is upper and lower
Row time slot and base station are strictly to it, and shielding after, mobile phone actively cuts out up transmitting thus up will not disturb base station generation.
That all employing equivalents or equivalent transformation are formed, use time delay aerial signal amplification forwarding mobile phone signal shielding scheme and reality
Existing method, all falls within the protection domain of application claims.
Claims (3)
1. one kind uses delay to forward the system realizing mobile phone signal shielding, it is characterised in that: this system includes reception antenna, sends sky
Line, power amplifier, LNA module, frequency mixing module, analog-to-digital conversion module, D/A converter module and field programmable gate array
FPGA, receives link: reception antenna receives aerial mobile communication wireless signal, is carried out signal by LNA module
It is downconverted into analog if signal through frequency mixing module after amplification, gives after AD sampling becomes digital medium-frequency signal
DDC module within FPGA, FPGA becomes the number of the low rate of zero intermediate frequency after signal carries out digital mixing and extraction
Word signal, is then passed to the ram memory cell within FPGA and carries out signal storage；Send link: within FPGA
Ram memory cell signal exports to be given DA after carrying out Interpolation of signals and digital mixing to DUC module and is converted into analog intermediate frequency
Signal, through frequency mixing module become radiofrequency signal through power amplifier to signal amplify after by transmission antenna launch aerial；FPGA
For carrying out signal sampling rate conversion and signal lag, it is the system of Ams for frame length, to the signal lag one received
Send after the time of frame or N frame.
The most according to claim 1 employing postpones to forward the system realizing mobile phone signal shielding, it is characterised in that: different systems
The frame time length of communication system is different, and the time catch cropping of time delay changes accordingly.
3. use the implementation method using and postponing to forward the system realizing mobile phone signal shielding as claimed in claim 1, its feature
It is: utilize reception antenna to connect aerial signal, sent by transmission antenna after the time of time delay one frame or N frame, forwards
Signal is that frame aligns, frequency is identical and modulation technique is identical with the normal signal that covers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310596518.1A CN103595497B (en) | 2013-11-21 | 2013-11-21 | A kind of employing postpones to forward the system and method realizing mobile phone signal shielding |
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| CN201310596518.1A CN103595497B (en) | 2013-11-21 | 2013-11-21 | A kind of employing postpones to forward the system and method realizing mobile phone signal shielding |
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| CN103595497A CN103595497A (en) | 2014-02-19 |
| CN103595497B true CN103595497B (en) | 2016-08-17 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106330383B (en) * | 2015-07-09 | 2019-02-12 | 福建澳瀚信息技术有限公司 | A kind of recording playback type wireless signal blocking-up method |
| CN106411453A (en) * | 2016-06-22 | 2017-02-15 | 福建澳瀚信息技术有限公司 | Destruction-type wireless signal blocking device and method based on code domain channel |
| 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 |
| CN111010251B (en) * | 2019-11-22 | 2023-11-14 | 福建金石电子有限公司 | Information management and control method for radio electronic countermeasure based on communication coding change |
| CN111600675A (en) * | 2020-05-14 | 2020-08-28 | 上海创远仪器技术股份有限公司 | System and method for realizing mobile communication signal shielding function based on frame delay induced self-interference mechanism |
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| US7224941B2 (en) * | 2003-10-20 | 2007-05-29 | Accton Technology Corporation | System and method for multi-path simulation |
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Effective date of registration: 20170712 Address after: Hangzhou City, Zhejiang province Binjiang District Puyan streets 310026 Torch Road No. 581, block A Room 606 Patentee after: Zhejiang Sanwei Communication Technology Co., Ltd. Address before: 310053 Hangzhou City, Binjiang District, Torch Road, No. 581, three-dimensional building (high tech Zone) Patentee before: Sunwave Communication Co., Ltd. |
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