CN104463280A - Carrier jamming restraining method of radio frequency identification reader-writer - Google Patents
Carrier jamming restraining method of radio frequency identification reader-writer Download PDFInfo
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- CN104463280A CN104463280A CN201410767507.XA CN201410767507A CN104463280A CN 104463280 A CN104463280 A CN 104463280A CN 201410767507 A CN201410767507 A CN 201410767507A CN 104463280 A CN104463280 A CN 104463280A
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Abstract
The invention relates to a carrier jamming restraining method of a radio frequency identification reader-writer. The carrier jamming restraining method of the radio frequency identification reader-writer comprises the following steps that firstly, received signals are demodulated, filtered and sampled, wherein pre-amplifying, orthogonality demodulating, low-pass filtering and analog-to-digital converting of the received signals are included, and therefore two paths of orthorhombic base band signals SI and SQ are obtained; secondly, the initial phase and amplitude are calculated through the orthorhombic signals, wherein the initial phase and the amplitude are shown in the specification; thirdly, phase correction iterative operation is carried out on the obtained initial phase to obtain a target phase; fourthly, an offset signal is produced, demodulated and overlapped to the received signals. The carrier jamming restraining method of the radio frequency identification reader-writer has the advantages that carrier signals of the reader-writer are eliminated or offset as much as possible, the highest sensitive degree of the reader-writer is achieved, and the effect of eliminating the carrier leakage interference can be achieved through the application of phase correction iterative operation.
Description
Technical field
The present invention relates to the method field that interference falls in radio-frequency identification reader/writer, specifically, is a kind of method of radio-frequency identification reader/writer suppression of intercarrier interference.
Background technology
REID is a kind of recognition technology utilizing spatial electromagnetic wave to carry out exchanges data.Radio-frequency recognition system is primarily of reader and label composition.Reader carrys out obtaining information by identification label.According to the difference of tag class, decipherment distance is also different.
Existing label is divided into active label and passive label two kinds.Wherein passive label is used widely because cost is low and volume is little.But because it leans on the carrier wave of reflection modulation read write line to communicate, thus there is following shortcoming:
Read write line can not send perfect sound, for reception carrier being make an uproar mutually, easily and echo obscure;
The non-tag reflection carrier wave that read write line receives;
The leakage carrier wave of read write line inside.
These are all the same audio-frequency noises with out of phase for read write line.If directly amplified after entering receiving cable, the dynamic range of receiver will be exceeded, receiving cable is got clogged, correctly cannot solve echo information, eliminate or offset read write line own carrier signal capabilities limited, be difficult to reach peak response.
Summary of the invention
The object of the invention is for deficiency of the prior art, a kind of radio-frequency identification reader/writer suppression of intercarrier interference method be provided, comprise the following steps:
A. receiving signal demodulation filtering sampling, comprise carry out pre-amplification to the received signal, quadrature demodulation, low pass filtered involve analog-to-digital process, thus obtain the orthogonal baseband signal of two-way: S
iand S
q;
B. utilize orthogonal signal to calculate initial phase and amplitude, described initial phase is:
described amplitude is:
C. carry out phase only pupil filter interative computation to the initial phase obtained and obtain target phase, described phase only pupil filter interative computation comprises the following steps:
C1. by the initial phase of gained in step b
be defined as iteration initial phase;
C2. offset phase is added and subtracted: for generating two comparative quantities, in described phase place
upper plus-minus θ obtains two paths of signals;
Described two comparative quantities substitute into and offset and calculate corresponding power and 1 and power and 2 by c3 respectively, feed back in Received signal strength by two paths of signals simultaneously, gather power near local frequency and;
C4. described in comparison step c3 power and 1 and power and 2;
C5. produce iterative phase, select iteration direction according to comparative result, determine target phase, carry out next iteration;
D. producing offseting signal and modulating is added on Received signal strength, comprises the following steps:
D1. the orthogonal signal that two comprise target phase and amplitude information are produced
and
D2. described orthogonal signal are carried out orthogonal modulation and are obtained offseting signal after digital to analog converter, and orthogonal modulation formula is:
the offseting signal obtained is:
D3. described offseting signal is fed back in Received signal strength by combiner.
The orthogonal baseband signal of two-way described in step a contains phase information and the amplitude information of carrier wave leakage.
The invention has the advantages that:
1, the inventive method elimination as much as possible or counteracting read write line own carrier signal, make read write line reach peak response.
2, the application of the phase only pupil filter interative computation of the inventive method, can reach the effect eliminating carrier wave leakage interference.
Accompanying drawing explanation
Accompanying drawing 1 is the step schematic diagram of the inventive method.
Accompanying drawing 2 is step schematic diagram of phase only pupil filter interative computation.
Embodiment
Below in conjunction with accompanying drawing, embodiment provided by the invention is elaborated.
As shown in Figure 1: a kind of radio-frequency identification reader/writer suppression of intercarrier interference method, comprises the following steps:
A. receiving signal demodulation filtering sampling, comprise carry out pre-amplification to the received signal, quadrature demodulation, low pass filtered involve analog-to-digital process, thus obtain the orthogonal baseband signal of two-way: S
iand S
q, described baseband signal contains phase information and the amplitude information of carrier wave leakage.
B. utilize orthogonal signal to calculate initial phase and amplitude, the initial phase calculated is:
amplitude is:
C. phase only pupil filter interative computation is carried out to the initial phase obtained and obtain target phase.In order to make target phase neutralization effect stronger, the inventive method uses self-adaptation type iterative algorithm to approach target phase, and described phase only pupil filter interative computation as shown in Figure 2, comprises the following steps:
C1. by the initial phase of gained in step b
be defined as iteration initial phase;
C2. offset phase is added and subtracted: for generating two comparative quantities, in described phase place
upper plus-minus θ obtains two paths of signals;
Described two comparative quantities substitute into and offset and calculate corresponding power and 1 and power and 2 by c3 respectively, feed back in Received signal strength by two paths of signals simultaneously, gather power near local frequency and;
C4. the power described in comparison step c3 and 1 and power and 2;
C5. produce iterative phase, select iteration direction according to comparative result, determine target phase, carry out next iteration;
D. producing offseting signal and modulating is added on Received signal strength, comprises the following steps:
D1. the orthogonal signal that two comprise target phase and amplitude information are produced
and
D2. described orthogonal signal are carried out orthogonal modulation and are obtained offseting signal after digital to analog converter, and orthogonal modulation formula is:
the offseting signal obtained is:
D3. described offseting signal is fed back in Received signal strength by combiner.
Offseting signal described in steps d 2 reveals the identical width of Received signal strength approximate reverse of carrier wave with mixing, therefore it is fed back to receiving cable by combiner, can reach the effect eliminating carrier wave leakage interference.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the inventive method; can also make some improvement and supplement, these improve and supplement and also should be considered as protection scope of the present invention.
Claims (2)
1. a radio-frequency identification reader/writer suppression of intercarrier interference method, is characterized in that, comprises the following steps:
A. receiving signal demodulation filtering sampling, comprise carry out pre-amplification to the received signal, quadrature demodulation, low pass filtered involve analog-to-digital process, thus obtain the orthogonal baseband signal of two-way: S
iand S
q;
B. utilize orthogonal signal to calculate initial phase and amplitude, described initial phase is:
described amplitude is:
C. carry out phase only pupil filter interative computation to the initial phase obtained and obtain target phase, described phase only pupil filter interative computation comprises the following steps:
C1. by the initial phase of gained in step b
be defined as iteration initial phase;
C2. offset phase is added and subtracted: for generating two comparative quantities, in described phase place
upper plus-minus θ obtains two paths of signals;
Described two comparative quantities substitute into and offset and calculate corresponding power and 1 and power and 2 by c3 respectively, feed back in Received signal strength by two paths of signals simultaneously, gather power near local frequency and;
C4. the power described in comparison step c3 and 1 and power and 2;
C5. produce iterative phase, select iteration direction according to comparative result, determine target phase, carry out next iteration;
D. producing offseting signal and modulating is added on Received signal strength, comprises the following steps:
D1. the orthogonal signal that two comprise target phase and amplitude information are produced
and
D2. described orthogonal signal are carried out orthogonal modulation and are obtained offseting signal after digital to analog converter, and orthogonal modulation formula is:
the offseting signal obtained is:
D3. described offseting signal is fed back in Received signal strength by combiner.
2. a kind of radio-frequency identification reader/writer suppression of intercarrier interference method according to claim 1, is characterized in that, the orthogonal baseband signal of the two-way described in step a contains phase information and the amplitude information of carrier wave leakage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410767507.XA CN104463280A (en) | 2014-12-12 | 2014-12-12 | Carrier jamming restraining method of radio frequency identification reader-writer |
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| CN201410767507.XA CN104463280A (en) | 2014-12-12 | 2014-12-12 | Carrier jamming restraining method of radio frequency identification reader-writer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109271817A (en) * | 2018-07-13 | 2019-01-25 | 江苏金中天智能科技有限公司 | A kind of carrier wave cancellation method and electronic label read/write based on wireless radio-frequency |
| CN111614360A (en) * | 2020-04-26 | 2020-09-01 | 四川润泽经伟信息技术有限公司 | Carrier interference device based on satellite communication countermeasure system and corresponding decoding method |
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| CN102222246A (en) * | 2011-06-25 | 2011-10-19 | 深圳市远望谷信息技术股份有限公司 | Carrier inhibiting method for radio frequency identification reader-writer and radio frequency device |
| CN202472702U (en) * | 2012-01-30 | 2012-10-03 | 江苏军一物联网股份有限公司 | Radio frequency front system for ultrahigh frequency RFID reader-writer |
| CN103746713A (en) * | 2013-12-31 | 2014-04-23 | 深圳市远望谷信息技术股份有限公司 | Device and method for suppressing emitting carrier waves in RFID (radio frequency identification) integral reader-writer |
-
2014
- 2014-12-12 CN CN201410767507.XA patent/CN104463280A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222246A (en) * | 2011-06-25 | 2011-10-19 | 深圳市远望谷信息技术股份有限公司 | Carrier inhibiting method for radio frequency identification reader-writer and radio frequency device |
| CN202472702U (en) * | 2012-01-30 | 2012-10-03 | 江苏军一物联网股份有限公司 | Radio frequency front system for ultrahigh frequency RFID reader-writer |
| CN103746713A (en) * | 2013-12-31 | 2014-04-23 | 深圳市远望谷信息技术股份有限公司 | Device and method for suppressing emitting carrier waves in RFID (radio frequency identification) integral reader-writer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109271817A (en) * | 2018-07-13 | 2019-01-25 | 江苏金中天智能科技有限公司 | A kind of carrier wave cancellation method and electronic label read/write based on wireless radio-frequency |
| CN111614360A (en) * | 2020-04-26 | 2020-09-01 | 四川润泽经伟信息技术有限公司 | Carrier interference device based on satellite communication countermeasure system and corresponding decoding method |
| CN111614360B (en) * | 2020-04-26 | 2023-10-27 | 四川润泽经伟信息技术有限公司 | Carrier interference device based on satellite communication countermeasure system and corresponding decoding method |
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Application publication date: 20150325 |
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