CN208209942U - A kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient - Google Patents
A kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient Download PDFInfo
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- CN208209942U CN208209942U CN201820912114.7U CN201820912114U CN208209942U CN 208209942 U CN208209942 U CN 208209942U CN 201820912114 U CN201820912114 U CN 201820912114U CN 208209942 U CN208209942 U CN 208209942U
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Abstract
The utility model belongs to field of communication technology, specifically a kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient.The utility model utilizes two-stage radio-frequency Interference Cancellation, guarantee in the signal before LNA module, the reconstruction plate noise introduced by the interference signal reconstructed is minimum, to realize after LNA gain, it is superimposed the smallest reconstruction plate in offseting signal and introduces noise coefficient, improves radio frequency interference neutralization effect.
Description
Technical field
The utility model belongs to field of communication technology, and amplifier introduces in specifically a kind of reduction radio frequency interference counteracting
The device of noise coefficient.
Background technique
In the existing communication technology, radio frequency interference cancellation technology is had been widely used in military and civil systems.It is special
It is not in military communication, radio frequency interference counteracting has extremely important value: realizing adjacent channel duplex, makes full use of frequency resource；
And be able to achieve transmitter and reconnaissance receiver while working normally, guarantee the validity and reliability of military confrontation；It simultaneously can also
Solve the problems, such as electromagnetic interference.
Radio frequency interference offsets the difference according to implementation, and main includes two aspects: direct RF coupling interference cancellation
And it penetrates radio frequency interference indirectly and offsets.Direct RF coupling interference cancellation is mainly the letter by exporting transmitting terminal radio frequency unit
Number after the processing such as be delayed, decay, it is sent by wire link and receives radio frequency unit, offseted.Indirect RF coupling is dry
It disturbs and offsets, be then to possess the radiofrequency signal of same channel decline using an additional radio frequency link generation to be offseted.
The basic principle that radio frequency interference is offset is to reconstruct the interference signal received by amplitude modulation, phase modulation processing, receive
To interference signal offset with the interference signal reconstructed, realize the purpose of interference cancellation.During reconstruction signal, meeting
New noise is introduced, when by rf board LNA, noise can be doubled and redoubled, therefore be effectively reduced in radio frequency interference counteracting by putting
Noise coefficient caused by big device, which seems, to be even more important.The side of noise coefficient is introduced to step-down amplifier in radio frequency interference counteracting at present
Method research is also in blank.
Utility model content
The purpose of this utility model, aiming at when carrying out radio frequency interference counteracting, radio frequency reconstruction plate is rebuild new number and is being passed through
When crossing rf board LNA module, introduce the excessive problem of noise, propose a kind of reductions radio frequency interference offset in amplifier introducing noise
The device of coefficient so that offset after signal in by reconstruction plate introduce noise substantially reduce, improve radio frequency cancelling capabilities.
The technology employed by the present utility model is
A kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient, which is characterized in that including the first coupling
Clutch, the second coupler, LNA, the first Radio Frequency Interfere reconstruction unit, the second Radio Frequency Interfere reconstruction unit and detection
Device；
First coupler, LNA and the second coupler are sequentially connected, and are constituted two-stage type radio frequency interference offset unit, are connect
The collection of letters number first coupler of input；Wherein, the first coupler is used to extract the dry of the first Radio Frequency Interfere reconstruction unit reconstruction
Signal is disturbed, coupling counters interference signal obtains the signal after first order radio frequency interference is offset, by LNA to first order radio frequency interference
Signal after counteracting amplifies；Second coupler is used to extract the interference letter of the second Radio Frequency Interfere reconstruction unit reconstruction
Number, the signal after second level radio frequency interference is offset is obtained after coupling counters interference signal, is restored for receiving end；
The input of the wave detector is the signal after second level radio frequency interference is offset, and the output end of wave detector connects first respectively
Radio Frequency Interfere reconstruction unit and the second Radio Frequency Interfere reconstruction unit.；
Further, the first Radio Frequency Interfere reconstruction unit is adjusted by sequentially connected first amplitude modulation module and first
Phase module is constituted, and the input of the first amplitude modulation module is transmitting signal, and the output of the first phase modulation module connects the first coupler；
The second Radio Frequency Interfere reconstruction unit is rebuild by sequentially connected second amplitude modulation module and the second phase modulation mould
Block is constituted, and the input of the second amplitude modulation module is transmitting signal, and the output of the second phase modulation module connects the second coupler.
The beneficial effects of the utility model are, using two-stage radio-frequency Interference Cancellation, guarantee the signal before LNA module
In, the reconstruction plate noise introduced by the interference signal reconstructed is minimum, to realize after LNA gain, folds in offseting signal
Add the smallest reconstruction plate to introduce noise coefficient, improves radio frequency interference neutralization effect.
Detailed description of the invention
Shown in fig. 1 is two-stage type radio frequency interference cancellation system structure chart；
Fig. 2 shows be that two-stage type radio frequency interference offsets flow chart；
Fig. 3 shows that two-stage type radio frequency interference offsets practical application block diagram.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and examples, more so as to those skilled in the art
Understand the utility model well.
Embodiment
This example radio frequency interference is offset based on co-channel full duplex system simultaneously, and using LTE standard, signal bandwidth 20MHz is penetrated
Again and again point is 2.6GHz, using direct RF coupling interference cancellation mode, carries out two-stage type radio frequency interference and offsets；
The system structure of this example forms: as shown in figure 3, transmitting terminal includes baseband processing unit 7 and radio frequency unit 8, receiving
End includes amplitude modulation module 15,17, phase modulation module 16,18, two-stage type radio frequency interference offset unit 9,10,11, wave detector 12, radio frequency
Unit 13 and baseband processing unit 14；
The workflow of this example are as follows: the first step, transmitting terminal baseband processing unit 7 generate 20MHz bandwidth baseband signal, by
DA mouthfuls of feeding transmitting terminal RF processing units 8；Second step, transmitting terminal RF processing unit 8 carry out radio frequency processing, generate transmitting letter
Number x (t), a routing transmitting antenna are sent, meanwhile, signal gives radiofrequency signal reconstruction unit all the way for coupling, and radiofrequency signal is rebuild single
Member includes two amplitude modulation modules 15,17, two phase modulation modules 16,18；Third step, receiving end antenna receives signal r (t), with tune
Width module 15, phase modulation module 16 are according to α1Range parameter, ω1The first via signal r'(t that phase parameter reconstructs)+Nf, carry out the
Level-one radio frequency interference is offset, and the signal power after offsetting is allowed to pass through LNA module 10；By the amplified signal r of LNAc
(t)+KNf(K is LNA gain, NfFor noise) again with amplitude modulation module 16, phase modulation module 18 according to α2Range parameter, ω2Phase ginseng
Second road signal r " (t)+N that number reconstructsf' carry out second level radio frequency interference offset；4th step is completed two-stage radio-frequency interference and is supported
Signal r after disappearingc'(t)+KNf+Nf' it is sent into wave detector, amplitude modulation, phase modulation parameter are arranged by wave detector；5th step, by two-stage
Radio frequency interference offset after signal, be sent into receiving end radio frequency unit 13, be filtered, be mixed, amplification etc. processing after, sent by AD mouthfuls
Enter Base Band Unit 14；6th step after Base Band Unit 14 pairs of reception signals in receiving end such as synchronize, demodulate, decoding at the processing, is completed
Base-Band Processing obtains originally transmitted signal.
The reconstruction plate noise coefficient introduced by amplifier is effectively reduced when carrying out radio frequency interference counteracting in the utility model,
Radio frequency interference neutralization effect is effectively promoted, and whole process is automatically performed by each circuit module, is not necessarily to manual intervention.
Claims (2)
1. a kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient, which is characterized in that including the first coupling
Device, the second coupler, LNA, the first Radio Frequency Interfere reconstruction unit, the second Radio Frequency Interfere reconstruction unit and wave detector；
First coupler, LNA and the second coupler are sequentially connected, and constitute two-stage type radio frequency interference offset unit, receive letter
Number input the first coupler；Wherein, the first coupler is used to extract the interference letter of the first Radio Frequency Interfere reconstruction unit reconstruction
Number, coupling counters interference signal obtains the signal after first order radio frequency interference is offset, and is offset by LNA to first order radio frequency interference
Signal afterwards amplifies；Second coupler is used to extract the interference signal of the second Radio Frequency Interfere reconstruction unit reconstruction, coupling
It closes and obtains the signal after second level radio frequency interference is offset after offsetting interference signal, restored for receiving end；
The input of the wave detector is the signal after second level radio frequency interference is offset, and the output end of wave detector connects the first radio frequency respectively
Interference signal reconstruction unit and the second Radio Frequency Interfere reconstruction unit.
2. a kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient according to claim 1, special
Sign is that the first Radio Frequency Interfere reconstruction unit is by sequentially connected first amplitude modulation module and the first phase modulation module structure
At the input of the first amplitude modulation module is transmitting signal, and the output of the first phase modulation module connects the first coupler；
The second Radio Frequency Interfere reconstruction unit is rebuild by sequentially connected second amplitude modulation module and the second phase modulation module structure
At the input of the second amplitude modulation module is transmitting signal, and the output of the second phase modulation module connects the second coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820912114.7U CN208209942U (en) | 2018-06-13 | 2018-06-13 | A kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820912114.7U CN208209942U (en) | 2018-06-13 | 2018-06-13 | A kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208209942U true CN208209942U (en) | 2018-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820912114.7U Expired - Fee Related CN208209942U (en) | 2018-06-13 | 2018-06-13 | A kind of device for reducing amplifier in radio frequency interference counteracting and introducing noise coefficient |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208209942U (en) |
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2018
- 2018-06-13 CN CN201820912114.7U patent/CN208209942U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181207 |