CN108734043A - A kind of adaptive feed-through nulling system and method - Google Patents
A kind of adaptive feed-through nulling system and method Download PDFInfo
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- CN108734043A CN108734043A CN201810844882.8A CN201810844882A CN108734043A CN 108734043 A CN108734043 A CN 108734043A CN 201810844882 A CN201810844882 A CN 201810844882A CN 108734043 A CN108734043 A CN 108734043A
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- 230000003044 adaptive effect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009413 insulation Methods 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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Abstract
The present invention provides a kind of adaptive feed-through nulling system and methods, the system comprises transmitting link, transceiver insulation circuit, feed-through nulling circuit, receiving circuit and frequency source circuits, the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link, the feed-through nulling circuit input end is separately connected the output end of frequency source circuit and the receiving terminal S1 of transceiver insulation circuit, the receiving circuit input terminal connects feed-through nulling circuit, and output end connects digital processing element.Advantageous effect of the present invention：By inhibiting the leakage signal of radio-frequency carrier, the sensitivity of ultrahigh-frequency passive radio-frequency identification reader is improved.
Description
Technical field
The invention belongs to technical field of RFID, more particularly, to a kind of adaptive feed-through nulling system and method.
Background technology
In ultra-high-frequency passive radio-frequency recognition system, when label and reader communicate, reader, which needs to send carrier wave always, to be carried
For tag-powered, label sends information to reader by backscatter modulation.Therefore the signal of label is received in reader
When, the radio-frequency carrier that the forward direction of reader is sent can leak into the reversed receiving portion of reader.Since tag backscatter is returned
Signal strength it is very small compared with the carrier signal strength that forward direction is sent, in actual system difference in signal strength reach 90dB with
On.
Ultrahigh frequency readers generally use directional coupler or circulator are come reverse signal isolation before realizing.
In reader, since antenna impedance is influenced to exactly match by environment and production technology, antenna to reading
The device parameters of length of cable variation and reader internal between device can be due to variation of ambient temperature, and production batch is different
And change, directional coupler and circulator can only provide the isolation of 20-30dB under combined influence.
For ultrahigh frequency readers, low isolation can cause high carrier leak, carrier leak height to increase to receiving
The requirement of the antenna efficiency range of linearity, while the noise entrained by carrier signal can reduce the sensitivity that reader receives signal.
Invention content
In view of this, the present invention is directed to propose a kind of adaptive feed-through nulling system and method, with what is solved the above problems
Shortcoming.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of adaptive feed-through nulling system, including transmitting link, transceiver insulation circuit, feed-through nulling circuit, reception electricity
Road and frequency source circuit, the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link, the feed-through nulling
Circuit input end is separately connected the output end of frequency source circuit and the receiving terminal S1 of transceiver insulation circuit, the receiving circuit input
End connection feed-through nulling circuit, output end connect digital processing element.
Further, the transmitting link includes DAC, I/Q modulator and signal amplifier, and the output end of the DAC connects
Connect the input terminal of I/Q modulators, the input terminal of the output termination signal amplifier of the I/Q modulators, the signal amplifier
Output end connection transceiver insulation circuit transmitting input terminal.
Further, the transceiver insulation circuit includes circulator or coupler.
Further, the feed-through nulling circuit includes VGA and combiner, and the input terminal of the VGA is connected by power splitter
The output end of frequency synthesizer is connect, the input terminal of the combiner is separately connected the output end of VGA and connecing for transceiver insulation circuit
Receiving end S1, output end connect the input terminal of receiving circuit；
Further, the frequency source circuit includes frequency synthesizer and power splitter, the input terminal connection of the power splitter
Three output ends of the output end of frequency synthesizer, power splitter are separately connected I/Q modulators, VGA and i/q demodulator；
Further, the receiving circuit includes i/q demodulator and ADC, and the input terminal of ADC connects the defeated of i/q demodulator
Outlet, and output end connects digital processing element.
Present invention also provides another embodiment, a kind of adaptive feed-through nulling method based on above system, including
Following steps：
A. transmitting link is opened so that the output power of antenna opening is A, simultaneously closes off the enabled of VGA, test is under this state
Leakage signal S1；
B. the enabled of transmitting link is closed, VGA is opened, adjusts the output signal S2 of VGA so that ADC under this state is adopted
Sample value I '2+Q′2It is identical as the leakage signal S1 in step A；
C. transmitting link and VGA circuit are opened simultaneously, the output signal of DAC is adjusted, ensures square of the two paths of signals of DAC
With it is consistent, adjust I1, Q1 size, the sampled value of ADC is detected, until meeting preset threshold value；
Further, in step A, the leakage signal S1 is the signal I that ADC is sampled2+Q2。
Compared with the existing technology, adaptive feed-through nulling system and method for the present invention has the advantage that：
(1) adaptive feed-through nulling system and method for the present invention is carried by the leakage signal of inhibition radio-frequency carrier
The high sensitivity of ultrahigh-frequency passive radio-frequency identification reader.
(2) adaptive feed-through nulling system and method for the present invention is adjusted using the I/Q modulators of transmitting link
The phase of leakage signal, amplitude adjustment then only need a VGA to complete；It with simple in structure, offsets efficient, is easy to
The advantages that control；Two parameters of amplitude and phase can adjust separately, and be independent of each other, and be not available for other feed-through nulling methods
's.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the adaptive feed-through nulling system structure diagram described in the embodiment of the present invention.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, a kind of adaptive feed-through nulling system, including transmitting link, transceiver insulation circuit, feed-through nulling electricity
Road, receiving circuit and frequency source circuit, the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link are described
Feed-through nulling circuit input end is separately connected the output end of frequency source circuit and the receiving terminal S1 of transceiver insulation circuit, the reception
Circuit input end connects feed-through nulling circuit, and output end connects digital processing element.
The transmitting link includes DAC, I/Q modulator and signal amplifier, the output end connection I/Q modulation of the DAC
The input terminal of device, the input terminal of the output termination signal amplifier of the I/Q modulators, the output end of the signal amplifier connect
Receive the transmitting input terminal of hair isolation circuit.
The transceiver insulation circuit includes circulator or coupler.
The feed-through nulling circuit includes VGA and combiner, and the input terminal of the VGA is synthesized by power splitter rate of connections
The input terminal of the output end of device, the combiner is separately connected the output end of VGA and the receiving terminal S1 of transceiver insulation circuit, output
The input terminal of end connection receiving circuit.
The frequency source circuit includes frequency synthesizer and power splitter, the input terminal rate of connections synthesizer of the power splitter
Output end, three output ends of power splitter are separately connected I/Q modulators, VGA and i/q demodulator.
The receiving circuit includes i/q demodulator and ADC, and the input terminal of ADC connects the output end of i/q demodulator, and defeated
Outlet connects digital processing element.
Present invention also provides another embodiment, a kind of adaptive feed-through nulling method based on above system, including
Following steps：
A. transmitting link is opened so that the output power of antenna opening is A, simultaneously closes off the enabled of VGA, test is under this state
Leakage signal S1；
B. the enabled of transmitting link is closed, VGA is opened, adjusts the output signal S2 of VGA so that ADC under this state is adopted
Sample value I '2+Q′2It is identical as the leakage signal S1 in step A；
C. transmitting link and VGA circuit are opened simultaneously, the output signal of DAC is adjusted, ensures square of the two paths of signals of DAC
With it is consistent, adjust I1, Q1 size, that is, change transmitting signal phase, detect the sampled value of ADC, it is preset until meeting
Threshold value；
In step A, the leakage signal S1 is the signal I that ADC is sampled2+Q2。
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (8)
1. a kind of adaptive feed-through nulling system, it is characterised in that：Including transmitting link, transceiver insulation circuit, feed-through nulling electricity
Road, receiving circuit and frequency source circuit, the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link are described
Feed-through nulling circuit input end is separately connected the output end of frequency source circuit and the receiving terminal S1 of transceiver insulation circuit, the reception
Circuit input end connects feed-through nulling circuit, and output end connects digital processing element.
2. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that：The transmitting link includes
DAC, I/Q modulator and signal amplifier, the input terminal of the output end connection I/Q modulators of the DAC, the I/Q modulators
Output termination signal amplifier input terminal, the signal amplifier output end connection transceiver insulation circuit transmitting input
End.
3. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that：The transceiver insulation circuit packet
Include circulator or coupler.
4. a kind of adaptive feed-through nulling system according to claim 2, it is characterised in that：The feed-through nulling circuit packet
Include VGA and combiner, the input terminal of the VGA by the output end of power splitter rate of connections synthesizer, the combiner it is defeated
Enter the receiving terminal S1 that end is separately connected the output end and transceiver insulation circuit of VGA, output end connects the input terminal of receiving circuit.
5. a kind of adaptive feed-through nulling system according to claim 4, it is characterised in that：The frequency source circuit includes
Frequency synthesizer and power splitter, the output end of the input terminal rate of connections synthesizer of the power splitter, three outputs of power splitter
End is separately connected I/Q modulators, VGA and i/q demodulator.
6. a kind of adaptive feed-through nulling system according to claim 5, it is characterised in that：The receiving circuit includes I/
Q demodulators and ADC, the output end of the input terminal connection i/q demodulator of ADC, and output end connects digital processing element.
7. a kind of adaptive feed-through nulling system as claimed in claim 6 offsets method, which is characterized in that including following step
Suddenly：
A. transmitting link is opened so that the output power of antenna opening is A, simultaneously closes off the enabled of VGA, tests letting out under this state
Leakage signal S1；
B. the enabled of transmitting link is closed, VGA is opened, adjusts the output signal S2 of VGA so that ADC sampled values under this state
I′2+Q′2It is identical as the leakage signal S1 in step A；
C. transmitting link and VGA circuit are opened simultaneously, the output signal of DAC is adjusted, ensures the quadratic sum one of the two paths of signals of DAC
It causes, adjusts the size of I1, Q1, the sampled value of ADC is detected, until meeting preset threshold value；
8. a kind of adaptive feed-through nulling method according to claim 7, it is characterised in that：In step A, the leakage letter
Number S1 is the signal I that ADC is sampled2+Q2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810844882.8A CN108734043B (en) | 2018-07-27 | 2018-07-27 | Self-adaptive leakage cancellation system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810844882.8A CN108734043B (en) | 2018-07-27 | 2018-07-27 | Self-adaptive leakage cancellation system and method |
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| Publication Number | Publication Date |
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| CN108734043A true CN108734043A (en) | 2018-11-02 |
| CN108734043B CN108734043B (en) | 2024-03-22 |
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| CN201810844882.8A Active CN108734043B (en) | 2018-07-27 | 2018-07-27 | Self-adaptive leakage cancellation system and method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070194886A1 (en) * | 2006-02-06 | 2007-08-23 | Samsung Electronics Co., Ltd. | RFID reader and method for removing a transmission carrier leakage signal |
| KR20090005942A (en) * | 2007-07-10 | 2009-01-14 | 삼성전자주식회사 | Rfid reader cancelling leakaged signal |
| US20090015378A1 (en) * | 2007-07-10 | 2009-01-15 | Samsung Electronics Co., Ltd. | Rfid reader cancelling leakage signal |
| CN205847256U (en) * | 2016-08-03 | 2016-12-28 | 江苏本能科技有限公司 | Radio-frequency carrier offsets process circuit |
| CN106919877A (en) * | 2015-12-25 | 2017-07-04 | 中国科学院上海高等研究院 | A kind of super high frequency radio frequency recognition read-write machine and method |
| CN208622108U (en) * | 2018-07-27 | 2019-03-19 | 天津中兴智联科技有限公司 | A kind of adaptive feed-through nulling system |
-
2018
- 2018-07-27 CN CN201810844882.8A patent/CN108734043B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070194886A1 (en) * | 2006-02-06 | 2007-08-23 | Samsung Electronics Co., Ltd. | RFID reader and method for removing a transmission carrier leakage signal |
| KR20090005942A (en) * | 2007-07-10 | 2009-01-14 | 삼성전자주식회사 | Rfid reader cancelling leakaged signal |
| US20090015378A1 (en) * | 2007-07-10 | 2009-01-15 | Samsung Electronics Co., Ltd. | Rfid reader cancelling leakage signal |
| CN106919877A (en) * | 2015-12-25 | 2017-07-04 | 中国科学院上海高等研究院 | A kind of super high frequency radio frequency recognition read-write machine and method |
| CN205847256U (en) * | 2016-08-03 | 2016-12-28 | 江苏本能科技有限公司 | Radio-frequency carrier offsets process circuit |
| CN208622108U (en) * | 2018-07-27 | 2019-03-19 | 天津中兴智联科技有限公司 | A kind of adaptive feed-through nulling system |
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| CN108734043B (en) | 2024-03-22 |
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Country or region after: China Address after: 300308 Tianjin Binhai New Area Airport Economic Zone Dongqidao No.2 ZTE Industrial Base Applicant after: Zte Intelligent Iot Technology Co.,Ltd. Address before: 300308 Tianjin Binhai New Area Airport Economic Zone Dongqidao No.2 ZTE Industrial Base Applicant before: ZTE INTELLIGENT IOT TECHNOLOGY Co.,Ltd. Country or region before: China |
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