CN101346734B - RFID system - Google Patents
RFID system Download PDFInfo
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- CN101346734B CN101346734B CN2006800487938A CN200680048793A CN101346734B CN 101346734 B CN101346734 B CN 101346734B CN 2006800487938 A CN2006800487938 A CN 2006800487938A CN 200680048793 A CN200680048793 A CN 200680048793A CN 101346734 B CN101346734 B CN 101346734B
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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
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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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
- G06K7/10019—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10029—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
- G06K7/10039—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot interrogator driven, i.e. synchronous
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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
- G06K7/10019—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10069—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the frequency domain, e.g. by hopping from one frequency to the other
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- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
A radio frequency identification tag includes an antenna terminal, a memory, a D/A converter, a clock extractor, a frequency synthesizer, a radio frequency UP converter, and a power unit. An energy pumping signal is received and tag identification information is transmitted through the antenna terminal. The tag identification information is stored in the memory. The D/A converter converts the tag identification information into an analog signal in response to an information request signal included in the energy pumping signal. The clock extractor extracts a clock signal from the energy pumping signal. The frequency synthesizer is operated according to the clock signal of the clock extractor, and generates a frequency. The radio frequency up converter up- converts a signal output from the D/A converter, and allows the up-converted signal to be transmitted through the antenna terminal. The power unit supplies internal power.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (RFID) reader and RFID label.
Background technology
Recently, radio-frequency (RF) identification (RFID) system has obtained using widely.
Rfid system comprises label and reader, and wherein label comprises detailed product information, and is attached on this product, and reader is used for the information of reading tag.
The rfid system of association area is to design in the framework of the standard that is one of " time slot aloha " and " binary tree " based on two kinds of algorithms, is proposed by ISO/IEC and EPCglobal.
Standard based on time slot aloha algorithm has low bit rate, and can not discern a plurality of labels individually with high discrimination.
Standard based on the binary tree algorithm provides the improved performance that allows to discern simultaneously with low bit rate a plurality of labels.In theory, can discern 1000 labels, but in fact based on the standard per second of binary tree algorithm, based on the number of the discernible non-fault label of standard per second of radix-2 algorithm less than 100.
When having defined in response to reader inquiry and from a large amount of label, the binary tree algorithm replys.In this case, reader out of phase (not-in-phase) that receive from a large amount of labels is replied.Therefore, reader has intrinsic received power variation from replying uniting of label reception.This changing value reaches about 40-50dB.Therefore, even do not have noise or interference, also be difficult to receive accurately reply.
In addition, owing to the reciprocal process of tag recognition based on the complexity between reader and the label, therefore the standard based on the binary tree algorithm is showing low reliability aspect the identification group interior label.
In rfid system, reader uses amplitude shift keying (ASK) signal to transmit, and label receives the ASK signal of reader.The label that receives the ASK signal uses this ASK signal as electric energy, simultaneously the ASK signal is carried out demodulation, with emission reader institute information requested.
Usually, passive label is changed the ASK signal by the voltage conversion circuit that comprises a plurality of schottky diodes, and use signal after conversion as electric energy so that reply.Yet, producing electric energy from the ASK signal and can expend preset time, this has interrupted in short time interval the identification to a large amount of labels.
In addition, when existing distance between a large amount of labels and reader and the label long or when surpassing the beam angle of antenna, voltage drop can take place, and may not can carry out tag operational.
Simultaneously the ASK signal is changed with demodulation and may be caused distorted signals.
Summary of the invention
Technical matters
Embodiments of the invention provide a kind of RFID reader and RFID label, and it uses OFDM (OFDM) signal to come executive communication.
Embodiments of the invention provide a kind of RFID reader and RFID label, and it is minimum that it can make the power consumption of label reduce to.
Embodiments of the invention provide a kind of RFID reader and RFID label, and it can improve the reliability of tag recognition.
Embodiments of the invention provide a kind of RFID reader and RFID label, and it has realized high recognition.
Embodiments of the invention provide a kind of RFID reader and RFID label, and it can increase the information capacity of label.
Embodiments of the invention provide a kind of label, and it can be made originally with low one-tenth.
Technical scheme
Embodiments of the invention provide a kind of RFID tag, and it comprises: antenna terminal, come received energy pump signal and emission label identification information by this antenna terminal; Storer stores tag identifier information in this storer; Modulator is used for the information request signal that comprises in response in this energy pump signal, and this tag identifier information is modulated to orthogonal frequency-division multiplex singal; Clock generator is used for producing clock according to the clock sync signal that comprises in this energy pump signal; Frequency synthesizer, its clock according to clock generator is operated, and produces frequency; Radio-frequency-up-converter is used for the signal from modulator output is carried out up-conversion, and allows to launch this signal by antenna terminal; And the power supply unit that is used to provide internal electric energy.
Embodiments of the invention provide a kind of RFID tag, and it comprises: antenna terminal, come received energy pump signal and emission label identification information by this antenna terminal; Storer stores tag identifier information in this storer; D/A converter is used for the information request signal that comprises in response in this energy pump signal, and is simulating signal with this tag identifier information translation; The Clock Extraction device is used for extracting clock signal from this energy pump signal; Frequency synthesizer, its clock signal according to the Clock Extraction device is operated, and produces frequency; Radio-frequency-up-converter is carried out up-conversion to the signal from D/A converter output, and allows to launch signal after up-conversion by antenna terminal; And the power supply unit that is used to provide internal electric energy.
Embodiments of the invention provide a kind of radio-frequency identification reader, and it comprises: transmitter, be used for the produce power pump signal, and this energy pump signal is used for the signal provision of supply of electrical energy and the clock sync signal and the information request signal of RFID tag; Antenna terminal is used for the output of transmitter is launched as high-frequency signal, and receives the orthogonal frequency-division multiplex singal from RFID tag; Receiver is used for the tag identifier information of the orthogonal frequency-division multiplex singal that comes to receive since antenna terminal is carried out demodulation; And microprocessor, be used for controlling transmitter and the signal that receiver demodulates is handled.
Beneficial effect
Rfid system receives the tag identifier information of OFDM forms from label 110 according to an embodiment of the invention, and in reader the information that receives is carried out demodulation, thereby fast and accurately a plurality of labels 110 are discerned.
Rfid system can be realized the simplification of label construction and the low cost manufacturing of label according to an embodiment of the invention.
Rfid system can provide a kind of agreement that contains much information of using short OFDM symbol according to an embodiment of the invention, thereby allows reliable and tag recognition fast.
Rfid system can allow the sufficient information storage in the label according to an embodiment of the invention.
Rfid system can provide the passive label with single chip according to an embodiment of the invention.
Rfid system can overcome the problem that is caused by the different RF ID frequency in the country variant in the world according to an embodiment of the invention.
Description of drawings
Fig. 1 shows the view of rfid system according to an embodiment of the invention;
Fig. 2 shows the view of identification structure at interval;
Fig. 3 shows the diagram with respect to the identification mistake variation of number of labels;
Fig. 4 shows the block diagram of label construction according to an embodiment of the invention;
Fig. 5 shows the block diagram of modulator configuration according to an embodiment of the invention;
Fig. 6 shows the block diagram of label construction according to another embodiment of the present invention;
Fig. 7 shows the view of ofdm signal structure according to an embodiment of the invention; And
Fig. 8 shows the block diagram of the configuration of RFID reader according to an embodiment of the invention.
Embodiment
Now with reference to accompanying drawing rfid system and RFID label are according to an embodiment of the invention described.
Even rfid system according to the present invention has been concentrated in the predetermined space such as container under the situation of a plurality of labels reliable tag recognition also is provided.The present invention can be no more than 10 so that the mistake when at least one label of identification produces probability
-6
With the example of passive label as label of the present invention.Passive label has very simple structure, and can make originally with the one-tenth of economy.In addition, the present invention also can be applicable to have the active label of the internal electric source of pre-charge.
The invention provides the new design of the rfid system that uses the OFDM technology.
[time isolation technics]
Ofdm signal provides the solution at the problem of the rfid system of association area.
At first, the OFDM technology can be an OFDM symbol with each information conversion that is stored in the label.
In addition, can be in the very short period transmission OFDM symbol.
In addition, can be with very short time interval transmission OFDM symbol.Therefore, can use ALOHA effectively, promptly add up anti-collision algorithm, and isolation technics can produce probability thereby reduced mistake from a plurality of tag read information during an identification period service time.In addition, can solve the power problems of active label and passive label effectively.
Fig. 1 shows the view of rfid system according to an embodiment of the invention.
In rfid system according to the present invention, a plurality of labels 110 link to each other by ofdm signal network 200 with reader 120.In an embodiment of the present invention, can be with the example of passive label as a plurality of labels 110, and the identified region of these a plurality of labels 110 through being discerned by the reader in the space such as container.
Reader 120 is the emitted energy pump signal in the whole identification period.This energy pump signal is used for the supply of electrical energy of label 110, and as clock sync signal and information request signal.
When receiving information request signal according to the ALOHA algorithm, each label 110 begins to add up the default pseudorandom time interval of himself.
The time slot at this interval equals the length of OFDM symbol.
Therefore, reply information request signal in himself the time slot of each label 110 in N time slot altogether.In the present invention this is comprised that N time slots is called test frame at interval.
If two or more labels are replied in identical time slot, then these labels are unrecognized during test frame.This collision is closed with the recognition differential misphase.
Identification error probability during test frame is very high.Yet, when in all labels are comprising identification period of k test frame, changing its number of timeslots, can reduce the identification error probability with pseudo-random fashion.
Fig. 2 shows the view of identification spacer structure.
Identification comprises k test frame (TF) at interval, and identification length at interval is one second, and each test frame has N time slot.
In Fig. 2, as example, T
SYMBBe approximately 61 μ s.Here, T
SYMBExpression comprises the duration of protection interval (GI) and single OFDM symbol.
Identification with ofdm signal of this configuration can be represented by following formula 1 at interval:
(formula 1)
Wherein, k is the quantity of test frame, and N is the quantity of the time slot that comprises in a test frame, T
SYMBIt is needed time of OFDM symbol of emission.
Constant " 1 " is the label spent time of 110 reception information from one group, and indicates one second as example.
In formula 1, will discern the total duration of period to the change permission of variable k in the formula 1 and N and be maintained one second, will discern mistake simultaneously and drop to minimum.
Formula 2 is used for calculating the identification error probability.The quantity of test frame (k) can change in 18 to 40 scope.If select 32 as k, then according to formula 2, N becomes 512.
Here, the identification mistake changes according to the quantity (n) of the label 110 that comprises in a group.
Fig. 3 shows the view according to the identification mistake variation of number of labels.
When number of labels (n) when being equal to or less than 400, the identification error probability reduces to 10
-6Or it is littler.This result provides by the time isolation technics.
Yet this result obtains under the OFDM symbol duration is set to the situation of 61 μ s, and can shorten the OFDM symbol duration.Then, frequency band can be widened, but number of timeslots (N) and test frame quantity (k) can be increased.Therefore, the number of labels that comprises in a group can be increased in, and the identification error probability can be reduced.
The time isolation technics can be expanded and be frequency separation technology and apart technology.
[frequency separation technology]
Label can be evenly distributed on a plurality of sub-channels.
Time separation in each channel is parallel and carries out independently.
Therefore, if use four channels, and have 250 labels in each channel, then mistake generation probability is 10
-10
On the contrary, if producing probability, mistake is fixed to 10
-6, then the number of labels in each channel can increase to 1600.
[apart technology]
But usage space isolation technics and reader antenna battle array are divided into a plurality of son groups with set of tags.
The core of apart technology is the control algolithm of adaptive array systems and multielement array.
The apart technology allows the separation to narrow local space.Therefore, can from the group of all labels, select and the recognin group.All child group can be by concurrently, discern with other son group separately.
For this reason, can use the single beam antenna array system to carry out scanning, perhaps can use the multiple-beam antenna battle array to carry out parallel processing the label that separates on the space.
[label construction]
Fig. 4 shows the block diagram of label construction according to an embodiment of the invention, and Fig. 5 shows the block diagram of modulator configuration according to an embodiment of the invention.
In storer 111, store from the tag identifier information of the input of the code source such as personal computer (PC).Be transformed storage tags identification information under the situation in the frequency domain in code source.Tag identifier information can comprise header information, product mark information and error correction information.Header information can comprise the information such as code format, code system version, code length.Product mark information can comprise the information certain product, price, available period and the original producton location that appends to such as label.Error correction information can comprise the information that is used for correcting the mistake that may take place at communication process.
The element of 115 pairs of labels 110 of steering logic is controlled, to launch the label identification information in response to the information request signal of launching from antenna 114.In the present invention, owing to label 110 is launched the tag identifier information that is stored in the storer 111 in response to the energy pump signal of input, therefore can optionally provide steering logic 115.
The tag identifier information that modulator 112 will be stored in the storer 111 is modulated to ofdm signal.
With reference to Fig. 5, modulator 112 can comprise scrambler 1121, interleaver 1122, invert fast fourier transformation (IFFT) 1123, protect and insert unit 1124 and D/A converter 1125 at interval.
1121 pairs of tag identifier information of scrambler are encoded, and the output code symbol.Scrambler 1121 output can forward error correction (FEC) code sign.
IFFT1123 is to carrying out invert fast fourier transformation from the signal of interleaver 1122 output, so that this signal is modulated in the subcarrier, thereby provides orthogonality in the frequency domain to this signal.
Protection is inserted unit 1124 at interval and is inserted protection at interval, so that the influence that the decay multipath disturbs.
The signal that inserts unit 1124 outputs from protection at interval becomes the signal that is transformed the time domain.
D/A converter 1125 is converted to simulating signal with digital signal, and the signal of output after conversion.
113 pairs of signals from modulator 112 outputs of RF upconverter carry out up-conversion, to launch this signal by antenna 114.
Different with the radio communication of other type, the label 110 that is applied to rfid system comprises pre-defined and is stored in numerical information in the label 110 in advance.
Therefore, by considering this characteristic of label 110, can provide label 110 with simpler structure.
Fig. 6 shows the block diagram of label construction according to another embodiment of the present invention.
For label as shown in Figure 6, with only describe and the label of Figure 4 and 5 between difference.
The label 110 of Fig. 6 has compares much simple structure with the structure of the label 110 shown in the Figure 4 and 5.
Particularly, in the label 110 of Fig. 6, simplified the configuration of modulator 112 greatly, and only had D/A converter 1125.
As indicated above, different with other radio communication, the label that is applied to rfid system has canned data in advance.Therefore, will transform to information stores frequency domain and the time domain from the code source 130 of PC130 in storer 111.
That is to say that label 110 uses the Software tool in the label production line that the numerical information of expecting is stored in the storer 111.At this moment, the numerical information of this expectation is transformed in frequency domain and the time domain, and is stored in advance.
Therefore, therefore the configuration that label 110 does not need scrambler 1121, interleaver 1122, IFFT1123 and protection to insert unit 1124 at interval can have simple structure.
In addition, different with the label 110 of Figure 4 and 5, label 110 shown in Figure 6 does not use the clock generator such as TXCO, and is to use Clock Extraction device 119 to extract internal clock signal from the external low frequency energy pump signal from reader 120.
By not using clock generator, can reduce the price and the size of label.In this case, label 110 can only comprise antenna and chip, and this allows the very little label 110 of manufacturing dimension.
In addition, during the clock generator, can solve when not in use owing in the country variant being the different problems that cause of UHF frequency band that rfid system distributes.
For example, Korea S uses the frequency band of 908-914MHz, and Japan uses the frequency band of 950-956MHz, and the frequency band of 862-870MHz is used in Europe.
Therefore, if having the label that is applicable to European frequency band to the goods of Japan outlet, then at Korea S and the Japanese label information that can not read this goods from Europe via Korea S.
In the present invention, can form emission (Tx) frequency of label 110 by frequency synthesizer 117, this frequency synthesizer 117 is the simplest phaselocked loop (PLL) compositors.Frequency synthesizer 117 can produce the frequency of 860-960MHz, to cover each national RFID frequency band.
The reference frequency of frequency synthesizer 117 is to determine by the energy pump signal of reader 120.
The frequency of energy pump signal can change according to the RFID frequency range in each country.
In the present invention, the identical frequency divider coefficient by in each country in the world fixes the Tx frequency of label 110 and the ratio between the energy pump frequency.
For example, the frequency divider coefficient of supposing to be used for frequency synthesizer 117 is 100, and then the energy pump signal can be set to 8.62-8.7MHz in Europe, can be set to 9.08-9.14MHz in Korea S, can be set to 9.50-9.56MHz in Japan.
In this case, unique difference is frequency-time scale (frequency bandwidth and an OFDM symbol duration), and this difference is less than ± 4%.
For example, owing to launch the signal that corresponding national reader 120 can read, therefore can use identical label 110 with Japan in Europe according to the frequency of extracting from each energy pump signal.
Therefore, label 110 can be carried out and the communicating by letter of each reader 120 of each country.
Fig. 7 shows the view of ofdm signal structure according to an embodiment of the invention.
The parameter of ofdm signal is provided in the table 1 below:
Table 1
| Parameter | Mark | Value |
| Frequency band | fo | 860-960MHz |
| Sub-carrier separation | ΔF | 20kHz |
| Sample frequency | F SAMPLE | 5.12MHz |
| Symbol lengths | T SYMB | 50μs |
| The protection gap length | TGI | 11μs |
| Spectrum width | Δf | 5.1MHz |
| Pilot sub-carrier quantity | N SP | 4 |
| Data subcarrier quantity | N SD | 248 |
| Subcarrier-modulated | QPSK | |
| FEC | 1/2 or 1/4 | |
| The label information capacity | Bit | 248 or 368 |
Fig. 8 is the block diagram of the reader configuration of rfid system according to an embodiment of the invention.
125 pairs of tag identifier information from the OFDM form of label 110 emissions of receiver are carried out demodulation.Particularly, receiver 125 can comprise protection canceller, fast fourier transformer (FFT), deinterleaver and demoder at interval.
That is to say that 125 pairs of ofdm signals from label 110 emissions of receiver are decoded.
The tag identifier information that storer 121 storages receive from label 110.
Rfid system receives the tag identifier information of OFDM forms from label 110 according to an embodiment of the invention, and in reader 120 information that receives is carried out demodulation, thereby fast and accurately a plurality of labels 110 are discerned.
Rfid system can be realized the simplification of label construction and the low cost manufacturing of label according to an embodiment of the invention.
Rfid system can provide a kind of agreement that contains much information of using short OFDM symbol according to an embodiment of the invention, thereby allows reliable and tag recognition fast.
Rfid system can allow the sufficient information storage in the label according to an embodiment of the invention.
Rfid system can provide the passive label with single chip according to an embodiment of the invention.
Rfid system can overcome the problem that is caused by the different RF ID frequency in the country variant in the world according to an embodiment of the invention.
Industrial usability
But can apply the present invention to the numerous areas of applying RFID system.
Claims (20)
1. RFID tag comprises:
Antenna terminal comes received energy pump signal and emission label identification information by described antenna terminal;
Storer stores tag identifier information in described storer;
Modulator is used for the information request signal that comprises in response in described energy pump signal, and described tag identifier information is modulated to orthogonal frequency-division multiplex singal;
Clock generator is used for producing clock according to the clock sync signal that comprises in described energy pump signal;
Frequency synthesizer, frequency is operated and produced to its described clock according to clock generator;
Radio-frequency-up-converter is used for the signal from modulator output is carried out up-conversion, and allows to launch signal after up-conversion by antenna terminal; And
Power supply unit is used to provide internal electric energy.
2. RFID tag according to claim 1, wherein said power supply unit use the energy pump signal that receives by described antenna terminal to produce internal electric energy.
3. RFID tag according to claim 1, wherein said power supply unit has pre-charge and electric energy stored.
4. RFID tag according to claim 1, wherein said tag identifier information is transformed in the frequency domain and is stored in the described storer.
5. RFID tag according to claim 1, wherein said modulator comprises:
Scrambler is used to export the code sign with forward error correction function;
Interleaver is used for described code sign is interweaved, and the signal of the code sign of output after interweaving;
Inverse fast Fourier transformer is used for to carrying out invert fast fourier transformation from the signal of interleaver output, so that described signal is modulated in the subcarrier;
The unit is inserted at the protection interval, is used for inserting protection at interval, with the influence of decay multipath interference; And
D/A converter, the conversion of signals that is used for inserting unit output at interval from protection is a simulating signal.
6. RFID tag according to claim 1 comprises logical circuit, and described logical circuit is used for carrying out control, to add up the default time interval and emission described tag identifier information in time delay ground is arranged.
7. RFID tag according to claim 1, wherein said tag identifier information is included in the orthogonal frequency-division multiplex singal.
8. RFID tag comprises:
Antenna terminal comes received energy pump signal and emission label identification information by described antenna terminal;
Storer stores tag identifier information in described storer;
D/A converter is used for the information request signal that comprises in response in described energy pump signal, and is simulating signal with described tag identifier information translation;
The Clock Extraction device is used for extracting clock signal from described energy pump signal;
Frequency synthesizer, frequency is operated and produced to its described clock signal according to the Clock Extraction device;
Radio-frequency-up-converter is used for the signal from D/A converter output is carried out up-conversion, and allows to launch signal after up-conversion by antenna terminal; And
Power supply unit is used to provide internal electric energy.
9. RFID tag according to claim 8, wherein said power supply unit use the energy pump signal that receives by described antenna terminal to produce internal electric energy.
10. RFID tag according to claim 8, wherein said power supply unit has pre-charge and electric energy stored.
11. RFID tag according to claim 8, wherein said tag identifier information is modulated to orthogonal frequency-division multiplex singal, is transformed in the time domain, and is stored in the described storer.
12. RFID tag according to claim 11, wherein said tag identifier information is included in the orthogonal frequency-division multiplex singal.
13. RFID tag according to claim 8 comprises logical circuit, described logical circuit is used for carrying out control, to add up the default time interval and emission described tag identifier information in time delay ground is arranged.
14. RFID tag according to claim 8, wherein said frequency synthesizer are created in the frequency in 860 to 960MHz the scope.
15. RFID tag according to claim 8, wherein said frequency synthesizer produces the frequency that changes according to the energy pump signal of importing.
16. a radio-frequency identification reader comprises:
Transmitter is used for the produce power pump signal, and described energy pump signal is used for the signal provision of supply of electrical energy and the clock sync signal and the information request signal of RFID tag;
Antenna terminal is used for the output of transmitter launched as high-frequency signal and receives orthogonal frequency-division multiplex singal from RFID tag;
Receiver is used for the tag identifier information of the orthogonal frequency-division multiplex singal that comes to receive since antenna terminal is carried out demodulation; And
Microprocessor is used for controlling transmitter and the signal that receiver demodulates is handled.
17. radio-frequency identification reader according to claim 16, wherein said antenna terminal use the single beam antenna array system to carry out scanning, and the emission high-frequency signal.
18. radio-frequency identification reader according to claim 16, the label that wherein said antenna terminal uses the multiple-beam antenna array 1 system to separate on the space is launched high-frequency signal concurrently.
19. radio-frequency identification reader according to claim 16, wherein said receiver comprise protection canceller, fast fourier transformer, deinterleaver and demoder at interval.
20. radio-frequency identification reader according to claim 16 comprises storer, the tag identifier information of storage after demodulation in described storer.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050127405A KR100775214B1 (en) | 2005-12-22 | 2005-12-22 | RFID system |
| KR10-2005-0127405 | 2005-12-22 | ||
| KR1020050127405 | 2005-12-22 | ||
| KR1020060128650 | 2006-12-15 | ||
| KR1020060128650A KR100828897B1 (en) | 2006-12-15 | 2006-12-15 | Rfid system |
| KR10-2006-0128650 | 2006-12-15 | ||
| PCT/KR2006/005625 WO2007073099A1 (en) | 2005-12-22 | 2006-12-21 | Rfid system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101346734A CN101346734A (en) | 2009-01-14 |
| CN101346734B true CN101346734B (en) | 2010-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800487938A Expired - Fee Related CN101346734B (en) | 2005-12-22 | 2006-12-21 | RFID system |
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| Country | Link |
|---|---|
| KR (1) | KR100775214B1 (en) |
| CN (1) | CN101346734B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100828897B1 (en) * | 2006-12-15 | 2008-05-09 | 엘지이노텍 주식회사 | Rfid system |
| CN101499143B (en) * | 2009-03-06 | 2012-08-22 | 上海复旦微电子股份有限公司 | Clock generating method in radio frequency identity recognition label |
| CN109614832B (en) * | 2018-11-20 | 2022-02-18 | 深圳市航天华拓科技有限公司 | Card reading method and device of radio frequency identification reader and computer readable storage medium |
| JP7478550B2 (en) * | 2020-02-25 | 2024-05-07 | 東芝テック株式会社 | leader |
| CN112001460B (en) * | 2020-07-16 | 2022-04-01 | 中国科学院微电子研究所 | Signal processing method and device and RFID system |
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| US20030040275A1 (en) * | 2001-08-27 | 2003-02-27 | Raj Bridgelall | Dual use of fft circuity in imagers and transceivers |
| CN1466288A (en) * | 2002-06-14 | 2004-01-07 | ���ǵ�����ʽ���� | Transmitter and method for transmitting OFDM cade unit |
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| US20040254829A1 (en) | 2003-05-13 | 2004-12-16 | Tripp Jeffrey William | Wireless access data sharing system |
| KR100654877B1 (en) * | 2004-12-30 | 2006-12-08 | 가부시키가이샤 히타치세이사쿠쇼 | Interrogator of moving body identification device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030040275A1 (en) * | 2001-08-27 | 2003-02-27 | Raj Bridgelall | Dual use of fft circuity in imagers and transceivers |
| CN1466288A (en) * | 2002-06-14 | 2004-01-07 | ���ǵ�����ʽ���� | Transmitter and method for transmitting OFDM cade unit |
Also Published As
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| CN101346734A (en) | 2009-01-14 |
| KR20070098958A (en) | 2007-10-08 |
| KR100775214B1 (en) | 2007-11-12 |
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