CN207218737U - A kind of OFDM wireless communication signals countermeasure set - Google Patents
A kind of OFDM wireless communication signals countermeasure set Download PDFInfo
- Publication number
- CN207218737U CN207218737U CN201721237016.XU CN201721237016U CN207218737U CN 207218737 U CN207218737 U CN 207218737U CN 201721237016 U CN201721237016 U CN 201721237016U CN 207218737 U CN207218737 U CN 207218737U
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- China
- Prior art keywords
- wireless communication
- communication signals
- mixer
- controller
- ofdm wireless
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a kind of OFDM wireless communication signals countermeasure set, including controller, and controller connects Analogue mixer, digital mixer connection modulator and DAC, DAC connection Analogue mixer by DDS connections digital mixer, by frequency synthesizer.The utility model uses small-sized power amplifier, and cost is low, small volume, and principle is simple, it is easy to accomplish.
Description
Technical field
The utility model belongs to wireless communication field, is related to a kind of countermeasure set for OFDM wireless communication signals.
Background technology
The ofdm signal availability of frequency spectrum is high, and transmission rate is fast, anti-multipath, frequency selective fading and arrowband interference performance
By force, it is widely applied in wireless communication field, many remote controls are using ofdm signal as wireless control signal.In order to
Unidentified and malice wireless remote controller is disturbed, it is necessary to effective OFDM wireless communication signals countermeasure sets.
The anti-arrowband interference performance of ofdm signal is strong；Interference is blocked in broadband needs larger power, interferes equipment cost
Height, volume are big, operation inconvenience；For traditional Multi-tone jamming method in the case of jamming equipment power limited, jamming-to-signal ratio is inadequate, does
It is poor to disturb effect, and multitone number and jamming bandwidth control are complicated.
Utility model content
The utility model provides a kind of countermeasure set for OFDM wireless communication signals, for solving above-mentioned prior art
In technical problem.
The utility model uses following technical scheme：
A kind of OFDM wireless communication signals countermeasure set, including controller, controller by DDS connections digital mixer,
Analogue mixer, digital mixer connection modulator and DAC, DAC connection Analogue mixer are connected by frequency synthesizer.
The DDS, modulator, digital mixer are run on FPGA, and the FPGA and frequency synthesizer pass through bus
Connect controller.
The controller connects display screen by EBI.
Compared with existing countermeasure set, the utility model uses small-sized power amplifier, and cost is low, small volume, and principle is simple,
It is easily achieved.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is the utility model principle schematic diagram.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
The utility model provides a kind of OFDM wireless communication signals countermeasure set, and wideband OFDM signal is done for realizing
Disturb.
The device includes controller, and Direct Digital Synthesizer is connected on controller（That is DDS）, controller passes through control
DDS processed produces a digital local oscillator signal L1, and modulator produces a narrowband baseband signal S0, narrowband baseband signal S0Bandwidth
Less than or equal to the bandwidth of ofdm signal subcarrier, its centre frequency is 0Hz.
Narrowband baseband signal S0With digital local oscillator signal L1It is mixed by digital mixer, the signal after mixing passes through
Digital analog converter（That is DAC）After carrying out digital-to-analogue conversion, intermediate-freuqncy signal S is obtained1。
Meanwhile the simulation local oscillation signal L of controller control frequency synthesizer output one2, above-mentioned intermediate-freuqncy signal S1With simulation originally
Shake signal L2After being mixed commonly through Analogue mixer, Radio Frequency Interfere S is exported2, the Radio Frequency Interfere can be right
Ofdm signal is disturbed.
In above-mentioned device, controller is realized using ARM chips, connects LCD display, modulator, digital mixing above
Device, DDS are run on FPGA, and display screen is connected by dedicated bus interface with ARM, and FPGA, frequency synthesizer pass through general total
Line is connected with ARM, passes through radio frequency line phase between DAC analog signal outputs mouth, frequency synthesizer delivery outlet and Analogue mixer
Even.
Device when in use, can be according to being actually needed, by display screen input parameter, and the parameter that can be inputted includes scanning
Beginning frequency, scanning terminate frequency, scanning stepping, scan period etc..
Specifically used method of the present utility model is as follows：
Digital local oscillator signal L1Frequency be fL1, fL1For the fixed value being previously set, or to be set by display screen
Fixed value；Simulate local oscillation signal L2Frequency be fL2；Radio Frequency Interfere S2Frequency be fc, from prior art：fc=
fL1+fL2.Frequency synthesizer controls parameter is manually entered by display screen：Scan stepping fd, scan period T, scanning initial frequency
fbgn, scanning terminate frequency fendSo that fL2In [fbgn, fend] in the range of scan round, finally cause fcIn [f1, fN] in the range of
Scan round, to cover each subcarrier of ofdm signal, realize signal S2Interference to wideband OFDM signal.[f1, fN] believe for OFDM
The frequency range of number N number of subcarrier.
The utility model produces Radio Frequency Interfere, Neng Gou by modulator, digital mixer and Analogue mixer etc.
Scan round travels through each subcarrier of OFDM wireless communication signals under pattern set in advance, realizes to OFDM wireless communication signals
Effectively interference.The broadband interference device using flexible that the utility model is realized, and narrow band signal is used, interference signal energy more collects
In, jamming-to-signal ratio is higher at the ofdm signal current sub-carrier position that interference signal aims at, and interference effect is more preferable, is easy to interference to set
It is standby to use small-sized power amplifier, cost is reduced, reduces volume.The utility model principle is simple, it is easy to accomplish.
Above-described is only preferred embodiment of the present utility model, it is noted that for those skilled in the art
For, under the premise of the utility model general idea is not departed from, some changes and improvements can also be made, these should also be considered as
The scope of protection of the utility model.
Claims (3)
- A kind of 1. OFDM wireless communication signals countermeasure set, it is characterised in that：Including controller, controller connects number by DDS Word frequency mixer, Analogue mixer is connected by frequency synthesizer, digital mixer connection modulator and DAC, DAC connection simulation are mixed Frequency device.
- A kind of 2. OFDM wireless communication signals countermeasure set according to claim 1, it is characterised in that：The DDS, modulation Device, digital mixer are run on FPGA, and the FPGA connects controller with frequency synthesizer by bus.
- A kind of 3. OFDM wireless communication signals countermeasure set according to claim 1, it is characterised in that：The controller leads to Cross EBI connection display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721237016.XU CN207218737U (en) | 2017-09-26 | 2017-09-26 | A kind of OFDM wireless communication signals countermeasure set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721237016.XU CN207218737U (en) | 2017-09-26 | 2017-09-26 | A kind of OFDM wireless communication signals countermeasure set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218737U true CN207218737U (en) | 2018-04-10 |
Family
ID=61822795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721237016.XU Expired - Fee Related CN207218737U (en) | 2017-09-26 | 2017-09-26 | A kind of OFDM wireless communication signals countermeasure set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207218737U (en) |
-
2017
- 2017-09-26 CN CN201721237016.XU patent/CN207218737U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180410 Termination date: 20190926 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |