CN1991859A - Random number producer and its seed counting value producing unit - Google Patents
Random number producer and its seed counting value producing unit Download PDFInfo
- Publication number
- CN1991859A CN1991859A CN 200510097571 CN200510097571A CN1991859A CN 1991859 A CN1991859 A CN 1991859A CN 200510097571 CN200510097571 CN 200510097571 CN 200510097571 A CN200510097571 A CN 200510097571A CN 1991859 A CN1991859 A CN 1991859A
- Authority
- CN
- China
- Prior art keywords
- voltage
- produces
- built
- number generator
- generation unit
- Prior art date
- 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.)
- Granted
Links
Images
Landscapes
- Burglar Alarm Systems (AREA)
- Lock And Its Accessories (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a random numbers generator that can be used in radio frequency identification label which can receive the carrier wave sent by radio frequency identification reader, the random numbers generator includes: oscillator which generates counter frequency according to the pressurizing voltage, the frequency of the counter frequency is relative with the voltage value; latch control unit which generates latch signal according to the pressurizing voltage; counter which is connected with the oscillator and the latch control unit, counts from the starting value according to the count frequency and generates seed count value according to the latch signal; and the random numbers generator which is connected with the counter and generates random numbers according to the seed count value. The random numbers generator of the radio frequency identification label in the invention includes random numbers generator, but also includes seed count value generator which generates the seed count value and makes the random numbers not regular and forecast and become true random numbers.
Description
Technical field
(Radio Frequency IDentification, RFID) technology is particularly about a kind of tandom number generator and seed counting value generation unit thereof of RFID tag to the invention relates to a kind of radio-frequency (RF) identification.
Background technology
Along with advancing by leaps and bounds of electronic technology, and radio-frequency (RF) identification (Radio Frequency Identification, RFID) technology reaches its maturity, and therefore, the range of application of REID is also more and more widely.In various fields such as logistics, retail, storage, traffic, false proof, national defence, medical treatment and military affairs, can see the trace of REID.
Fig. 1 is the functional schematic of existing radio-frequency recognition system 10.Radio-frequency recognition system 10 comprises RFID tag (RFID Tag, or title transponder) 12, is arranged on helical antenna (coiled antenna) 14 and RFID reader (RFIDreader) 16 on the radio frequency recognition volume label 12.RFID reader 16 reads the recognition data ID of radio frequency recognition volume label 12 storeies 18 stored constantly to launch the mode of carrier wave instruction (carrierinstruction) CI via helical antenna 14.Wherein, recognition data ID meets electronic goods code (Electronic Product Code, EPC) standard.
Except storer 18, radio frequency recognition volume label 12 also comprises analog module 20 and digital module 22.Analog module 20 demodulation (demodulate) carrier wave instruction CI, and the instruction of the carrier wave after demodulation CI is sent to digital module 22 by input end Data IN; (suppose that carrier wave instruction CI reads the recognition data ID of storer 18 stored of radio frequency recognition volume label 12) behind the digital module 22 parsing carrier wave instruction CI, the recognition data ID (ID Data) of storer 18 storages is passed back to analog module 20 by transmission end TXD; Analog module 20 is then with recognition data ID modulation (modulate), and the recognition data ID after will modulating wirelessly, is sent to RFID reader 16 by helical antenna 14.Arrive this, RFID reader 16 can be deciphered (decode) to its recognition data ID that receives, and relevant informations such as the Item Title of identification RFID tag 12 and price.
In radio-frequency recognition system 10, when once having only a RFID tag 12 by RFID reader 16, RFID reader 16 can receive and decipher the recognition data ID of radio frequency recognition volume label 12 smoothly, and relevant informations such as the Item Title of identification RFID tag 12 and price.But, when simultaneously a large amount of RFID tag 12 being arranged by RFID reader 16, that is to say when label collision (Tag collision) takes place, must decode the simultaneously recognition data ID of these RFID tag 12 storages of RFID reader 16, like this, the mistake that bumps probably, thus the Item Title and the price of RFID tag 12 discerned mistakenly.
Please consult Fig. 1 again.In order to address the above problem, also comprise random number generation unit 24 in the RFID tag 12 of radio-frequency recognition system 10, random number generation unit 24 is arranged in the digital module 22.Random number generation unit 24 produces different random number R N, and RFID tag 12 is according to these different random number R N, and the recognition data ID of its storage is corresponded to time slot (time slot) TL respectively, is sent to RFID reader 16 successively.Like this, the RFID reader 16 recognition data ID that these RFID tag 12 transmit that can decode seriatim avoids colliding wrong generation.
But in fact " random number " of 24 generations of random number generation unit is not random number truly.Particularly, in case distribution (distribution) and seed counting value (seed number) SN that random number generation unit 24 adopts are determined values, that is to say that seed counting value SN immobilizes, " random number " that random number generation unit 24 produces has systematicness and predictability.Though these RFID tag 12 arrive RFID reader 16 respectively according to its time corresponding groove TL, but " random number " of these time slots TL correspondence has systematicness and predictability, so, RFID reader 16 is when the recognition data ID of these RFID tag 12 storages of decoding, and mistake probably bumps.
Summary of the invention
For overcoming above-mentioned prior art problems, fundamental purpose of the present invention is to provide a kind of tandom number generator and relevant seed counting value generation unit that is used for RFID tag, has solved existing label collision problem.
For achieving the above object, the invention provides a kind of tandom number generator (Random NumberGenerator, RNG), but be applied in received RF identification reader (Radio FrequencyIdentification, RFID reader) in the RFID tag (RFID Tag) of emission carrier wave, this RFID tag produces built-up voltage according to this carrier wave, this tandom number generator comprises: oscillator, produce count frequency according to this built-up voltage, the frequency of this count frequency is relevant with the magnitude of voltage of this built-up voltage; The breech lock control module produces latch-up signal according to this built-up voltage; Counter is connected this oscillator and this breech lock control module, begins counting according to this count frequency from initial count value, and produces the seed counting value according to this latch-up signal; And the random number generation unit, be connected this counter, produce random number according to this seed counting value.
Wherein, this oscillator is ring type oscillator (ring oscillator).This RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this ring type oscillator is arranged in this boost pressure circuit.This breech lock control module comprises according to this built-up voltage and produces the voltage stabilizer of voltage of voltage regulation and be connected this voltage stabilizer and produce the breech lock controller of this latch-up signal when the voltage of voltage regulation that this voltage stabilizer produces exceeds predetermined voltage.This tandom number generator also comprises the initial count value generation unit that produces this initial count value according to this built-up voltage.This initial count value generation unit comprises transistor, and this transistor in the mode of output logic high voltage or logic low-voltage, produces this initial count value according to this built-up voltage.
The invention still further relates to a kind of tandom number generator, but be applied in the RFID tag of received RF identification reader emission carrier wave, this RFID tag produces built-up voltage according to this carrier wave, and this tandom number generator comprises: oscillator produces count frequency; Voltage stabilizer produces voltage of voltage regulation according to this built-up voltage; The breech lock controller is connected this voltage stabilizer, when the voltage of voltage regulation of this voltage stabilizer generation exceeds predetermined voltage, produces latch-up signal; Counter is connected this oscillator and this breech lock controller, begins counting according to this count frequency from initial count value, and produces the seed counting value according to this latch-up signal; And the random number generation unit, be connected this counter, produce random number according to this seed counting value.
The present invention relates to a kind of tandom number generator again, but is applied in the RFID tag of received RF identification reader emission carrier wave, and this RFID tag produces built-up voltage according to this carrier wave, and this tandom number generator comprises: oscillator produces count frequency; The breech lock control module produces latch-up signal according to this built-up voltage; Initial count value generation unit produces initial count value according to this built-up voltage; Counter is connected this oscillator, breech lock control module and this initial count value generation unit, begins counting according to this count frequency from this initial count value, and produces the seed counting value according to this latch-up signal; And the random number generation unit, be connected this counter, produce random number according to this seed counting value.
The present invention also provides a kind of seed counting value generation unit, produce tandom number generator required seed counting value when operation, but this tandom number generator is applied in the RFID tag of the carrier wave that received RF identification reader launches, and this RFID tag produces built-up voltage according to this carrier wave, this tandom number generator system produces random number according to this seed counting value, this seed counting value generation unit comprises: oscillator, produce count frequency according to this built-up voltage, the frequency of this count frequency is relevant with the magnitude of voltage of this built-up voltage; Voltage stabilizer produces voltage of voltage regulation according to this built-up voltage; The breech lock controller is connected this voltage stabilizer, when the voltage of voltage regulation of this voltage stabilizer generation exceeds predetermined voltage, produces latch-up signal; Initial count value generation unit produces initial count value according to this built-up voltage; And counter, be connected this oscillator, breech lock controller and this initial count value generation unit, begin counting according to this count frequency from this initial count value, and produce this seed counting value according to this latch-up signal.
Compared with prior art, the tandom number generator of RFID tag of the present invention except comprising the random number generation unit, also comprises seed counting value generation unit, produces the seed counting value of this random number generation unit.Because the initial count value that fixing, the initial count value generation unit of the count frequency that the oscillator of this seed counting value generation unit produces produces is uncertain and the breech lock control module when to produce latch-up signal also uncertain, so, the seed counting value that this counter produces is just unfixing yet, like this, " random number " that this random number generation unit produces just do not had systematicness and a predictability yet, becomes " random number " truly.
Description of drawings
Fig. 1 is the functional schematic of existing radio-frequency recognition system.
Fig. 2 is the functional schematic that tandom number generator of the present invention comprises the radio-frequency recognition system of seed counting value generation unit.
Embodiment
Embodiment
Fig. 2 is the functional schematic that tandom number generator of the present invention comprises the radio-frequency recognition system 50 of seed counting value generation unit 56, and seed counting value generation unit 56 provides the seed counting value SN of random number generation unit 24 in the radio-frequency recognition system 50.Except RFID reader 16 and helical antenna 14, radio-frequency recognition system 50 also comprises RFID tag 52.Helical antenna 14 is arranged on the RFID tag 52, and the recognition data ID with 58 storages of the storer in the radio frequency recognition volume label 52 is sent to RFID reader 16 with wireless mode.
Except storer 58, radio frequency recognition volume label 52 also comprises analog module 60 and digital module 22.The carrier wave instruction CI of analog module 60 demodulation RFID reader 16 emission, and the instruction of the carrier wave after demodulation CI is sent to digital module 22.
It is predictable being different from the seed counting value SN that existing radio-frequency recognition system 10 is input to random number generation unit 24, and the seed counting value SN that radio-frequency recognition system 50 of the present invention is input to random number generation unit 24 is produced by seed counting value generation unit 56.
Because the carrier voltage value height that RFID tag 52 receives, can be along with RFID tag 52 is far and near and different apart from RFID reader 16, particularly, when RFID tag 52 far away more apart from RFID reader 16, the carrier voltage value that RFID tag 52 receives can be low more, otherwise, the carrier voltage value that RFID tag 52 receives can be high more, in addition, even if the position between two RFID tag 52 and the RFID reader 16 is identical, arrive the carrier voltage value on these two RFID tag 52, still can be because the processing procedure of these two RFID tag 52 is different difference to some extent, therefore, the carrier voltage value that RFID tag 52 receives is unfixed, in other words, the magnitude of voltage climbing speed of the built-up voltage CPV that boost pressure circuit 54 produces also is unfixed, correspondingly, the frequency of the count frequency CLK that produces of ring type oscillator 62 (producing count frequency CLK according to built-up voltage CPV) is advanced the speed and size is unfixed, advancing the speed of the count value CN that counter 56 is being counted is unfixed, when built-up voltage CPV can exceed predetermined voltage PV is uncertain, when breech lock control module 66 can produce latch-up signal LS is uncertain, the seed counting value SN that count value 56 produces also is uncertain.Because the seed counting value SN that random number generation unit 24 produces random number R N is unfixed,, become real random number so " random number " that random number generation unit 24 produces just do not have systematicness and predictability.
In an embodiment of the present invention, breech lock control module 66 comprises voltage stabilizer (regulator) 70 and breech lock controller (latch controller) 72, and wherein, voltage stabilizer 70 produces voltage of voltage regulation RV according to built-up voltage CPV.Particularly, the built-up voltage CPV that voltage stabilizer 70 will raise gradually is stabilized in voltage of voltage regulation RV, and breech lock controller 72 is connected voltage stabilizer 72, when the voltage of voltage regulation RV of voltage stabilizer 72 generations exceeds predetermined voltage PV, produces latch-up signal LS.
In an embodiment of the present invention, ring type oscillator 62 is arranged in the boost pressure circuit 54, the ring type oscillator of radio-frequency recognition system of the present invention also can independently be arranged on outside the boost pressure circuit 54, or radio-frequency recognition system of the present invention also can comprise other kind oscillator, is not limited to ring type oscillator 62.In addition, counter 68 can be the counter of ascending order counter, descending counter or any other kind.Moreover radio-frequency recognition system of the present invention also can adopt the antenna of other type, is not limited to the helical antenna 14 that radio-frequency recognition system 50 adopts in the embodiment of the invention.At last, initial count value generation unit 64 comprises transistor, this transistor can be arranged in the boost pressure circuit 54, also can independently be arranged on outside the boost pressure circuit 54, this transistor is according to built-up voltage CPV, and the mode with output logic high voltage (Logic high) LH or logic low-voltage (Logic low) LL produces initial count value INN, in other words, the initial count value INN of this transistor generation also is uncertain.Particularly, when the lucky energy of the operating voltage WV enabling counting device 68 corresponding to built-up voltage CPV begins to count, operating voltage WV still can be positioned at this transistorized uncertain region (undefined region), that is to say, operating voltage WV reaches down between the limit voltage between the last limit voltage of this transistor generation transition (state transition), so, this transistor is that generation logic high voltage LH or generation logic low-voltage LL also are uncertain, correspondingly, the initial count value INN of initial count value generation unit 64 generations is also just uncertain.
Compared with prior art, the tandom number generator of RFID tag of the present invention, except Comprise outside the random number generation unit, also comprise seed count value generation unit, produce this random number The seed count value of generation unit. Because the oscillator of this seed count value generation unit produces The initial count value that fixing, the initial count value generation unit of count frequency produces is uncertain, with And the breech lock control module when can to produce latch-up signal also uncertain, so produce according to this counter The seed count value of giving birth to is also just fixing, like this, this random number generation unit produce " at random Number " just do not have systematicness and predictability, become real " random number ".
Claims (26)
1. a tandom number generator is discerned the RFID tag that reader is launched carrier wave but be applied in received RF, and this RFID tag produces built-up voltage according to this carrier wave, it is characterized in that this tandom number generator comprises:
Oscillator produces count frequency according to this built-up voltage, and the frequency of this count frequency is relevant with the magnitude of voltage of this built-up voltage;
The breech lock control module produces latch-up signal according to this built-up voltage;
Counter is connected this oscillator and this breech lock control module, begins counting according to this count frequency from initial count value, and produces the seed counting value according to this latch-up signal; And
The random number generation unit is connected this counter, produces random number according to this seed counting value.
2. tandom number generator as claimed in claim 1 is characterized in that, this oscillator is the ring type oscillator.
3. tandom number generator as claimed in claim 2 is characterized in that this RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this ring type oscillator is arranged in this boost pressure circuit.
4. tandom number generator as claimed in claim 1, it is characterized in that this breech lock control module comprises according to this built-up voltage and produces the voltage stabilizer of voltage of voltage regulation and be connected on this voltage stabilizer and produce the breech lock controller of this latch-up signal when the voltage of voltage regulation that this voltage stabilizer produces exceeds predetermined voltage.
5. tandom number generator as claimed in claim 1 is characterized in that, this tandom number generator also comprises the initial count value generation unit that produces this initial count value according to this built-up voltage.
6. tandom number generator as claimed in claim 5 is characterized in that, this initial count value generation unit comprises transistor, and this transistor in the mode of output logic high voltage or logic low-voltage, produces this initial count value according to this built-up voltage.
7. tandom number generator as claimed in claim 6 is characterized in that this RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this transistor is arranged in this boost pressure circuit.
8. a tandom number generator is discerned the RFID tag that reader is launched carrier wave but be applied in received RF, and this RFID tag produces built-up voltage according to this carrier wave, it is characterized in that this tandom number generator comprises:
Oscillator produces count frequency;
Voltage stabilizer produces voltage of voltage regulation according to this built-up voltage;
The breech lock controller is connected this voltage stabilizer, when the voltage of voltage regulation of this voltage stabilizer generation exceeds predetermined voltage, produces latch-up signal;
Counter is connected this oscillator and this breech lock controller, begins counting according to this count frequency from initial count value, and produces the seed counting value according to this latch-up signal; And
The random number generation unit is connected this counter, produces random number according to this seed counting value.
9. tandom number generator as claimed in claim 8 is characterized in that, this oscillator is the ring type oscillator.
10. tandom number generator as claimed in claim 9 is characterized in that this RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this ring type oscillator is arranged in this boost pressure circuit.
11. tandom number generator as claimed in claim 8 is characterized in that, this oscillator produces this count frequency according to this built-up voltage, and the frequency of this count frequency is relevant with the magnitude of voltage of this built-up voltage.
12. tandom number generator as claimed in claim 8 is characterized in that, this tandom number generator also comprises the initial count value generation unit that produces this initial count value according to this built-up voltage.
13. tandom number generator as claimed in claim 12 is characterized in that, this initial count value generation unit comprises transistor, and this transistor in the mode of output logic high voltage or logic low-voltage, produces this initial count value according to this built-up voltage.
14. tandom number generator as claimed in claim 13 is characterized in that, this RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this transistor is arranged in this boost pressure circuit.
15. a tandom number generator, but be applied in the RFID tag that received RF identification reader is launched carrier wave, and this RFID tag produces built-up voltage according to this carrier wave, it is characterized in that this tandom number generator comprises:
Oscillator produces count frequency;
The breech lock control module produces latch-up signal according to this built-up voltage;
Initial count value generation unit produces initial count value according to this built-up voltage;
Counter is connected this oscillator, breech lock control module and this initial count value generation unit, begins counting according to this count frequency from this initial count value, and produces the seed counting value according to this latch-up signal; And
The random number generation unit is connected this counter, produces random number according to this seed counting value.
16. tandom number generator as claimed in claim 15 is characterized in that, this oscillator is the ring type oscillator.
17. tandom number generator as claimed in claim 16 is characterized in that, this RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this ring type oscillator is arranged in this boost pressure circuit.
18. tandom number generator as claimed in claim 15 is characterized in that, this oscillator produces this count frequency according to this built-up voltage, and the frequency of this count frequency is the magnitude of voltage about this built-up voltage.
19. tandom number generator as claimed in claim 15 is characterized in that, this initial count value generation unit comprises transistor, and this transistor in the mode of output logic high voltage or logic low-voltage, produces this initial count value according to this built-up voltage.
20. tandom number generator as claimed in claim 19 is characterized in that, this RFID tag comprises the boost pressure circuit that produces this built-up voltage, and this transistor is arranged in this boost pressure circuit.
21. tandom number generator as claimed in claim 15, it is characterized in that this breech lock control module comprises according to this built-up voltage and produces the voltage stabilizer of voltage of voltage regulation and be connected this voltage stabilizer and produce the breech lock controller of this latch-up signal when the voltage of voltage regulation that this voltage stabilizer produces exceeds predetermined voltage.
22. seed counting value generation unit, produce tandom number generator required seed counting value when operation, but this tandom number generator is applied in the RFID tag of received RF identification reader emission carrier wave, this RFID tag produces built-up voltage according to this carrier wave, this tandom number generator produces random number according to this seed counting value, it is characterized in that this seed counting value generation unit comprises:
Oscillator produces count frequency according to this built-up voltage, and the frequency of this count frequency is relevant with the magnitude of voltage of this built-up voltage;
Voltage stabilizer produces voltage of voltage regulation according to this built-up voltage;
The breech lock controller is connected this voltage stabilizer, when the voltage of voltage regulation of this voltage stabilizer generation exceeds predetermined voltage, produces latch-up signal;
Initial count value generation unit produces initial count value according to this built-up voltage; And
Counter is connected this oscillator, breech lock controller and this initial count value generation unit, begins counting according to this count frequency from this initial count value, and produces this seed counting value according to this latch-up signal.
23. seed counting value generation unit as claimed in claim 22 is characterized in that this oscillator is the ring type oscillator.
24. seed counting value generation unit as claimed in claim 23 is characterized in that this RFID tag comprises the boost pressure circuit that produces this built-up voltage, this ring type oscillator is arranged in this boost pressure circuit.
25. seed counting value generation unit as claimed in claim 22 is characterized in that, this initial count value generation unit comprises transistor, and this transistor in the mode of output logic high voltage or logic low-voltage, produces this initial count value according to this built-up voltage.
26. seed counting value generation unit as claimed in claim 25 is characterized in that this RFID tag comprises the boost pressure circuit that produces this built-up voltage, this transistor is arranged in this boost pressure circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510097571A CN1991859B (en) | 2005-12-30 | 2005-12-30 | Random number producer and its seed counting value producing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510097571A CN1991859B (en) | 2005-12-30 | 2005-12-30 | Random number producer and its seed counting value producing unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1991859A true CN1991859A (en) | 2007-07-04 |
| CN1991859B CN1991859B (en) | 2010-05-05 |
Family
ID=38214109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510097571A Expired - Fee Related CN1991859B (en) | 2005-12-30 | 2005-12-30 | Random number producer and its seed counting value producing unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1991859B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184087A (en) * | 2011-04-25 | 2011-09-14 | 广州中大微电子有限公司 | RFID (Radio Frequency Identification Device) tag chip true random number generator |
| CN102479067A (en) * | 2010-11-25 | 2012-05-30 | 上海宇芯科技有限公司 | Method and device for generating true random number |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9900158B2 (en) | 2012-03-23 | 2018-02-20 | Nokia Technologies Oy | Cryptographically authenticated communication |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1309179C (en) * | 2002-04-17 | 2007-04-04 | 盛群半导体股份有限公司 | Recognition code transmission method and circuit arrangement |
| JP2004127217A (en) * | 2002-07-30 | 2004-04-22 | Univ Niigata | Method for generating random number and random number generator |
| US20040049525A1 (en) * | 2002-09-06 | 2004-03-11 | Koninklijke Philips Electronics N.V. | Feedback random number generation method and system |
| US7005965B2 (en) * | 2003-02-14 | 2006-02-28 | Winbond Electronics Corporation | Radio frequency identification device |
| JP4248950B2 (en) * | 2003-06-24 | 2009-04-02 | 株式会社ルネサステクノロジ | Random number generator |
-
2005
- 2005-12-30 CN CN200510097571A patent/CN1991859B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102479067A (en) * | 2010-11-25 | 2012-05-30 | 上海宇芯科技有限公司 | Method and device for generating true random number |
| CN102479067B (en) * | 2010-11-25 | 2016-03-16 | 上海宇芯科技有限公司 | A kind of true random number generation method and device |
| CN102184087A (en) * | 2011-04-25 | 2011-09-14 | 广州中大微电子有限公司 | RFID (Radio Frequency Identification Device) tag chip true random number generator |
| CN102184087B (en) * | 2011-04-25 | 2014-01-15 | 广州中大微电子有限公司 | RFID (Radio Frequency Identification Device) tag chip true random number generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1991859B (en) | 2010-05-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1790366B (en) | Conflict preventing method for multiple electronic label detection for RFID system | |
| CN103971076A (en) | Wireless communications using active modulation | |
| CN100412879C (en) | Radio frequency identification reader, radio frequency identification tag, system and method for identifying rfid tags | |
| WO2006023601A3 (en) | Product identication tag device and reader . | |
| US9041515B2 (en) | Apparatus comprising display driving integrated circuit and radio-frequency identification reader | |
| US8947209B2 (en) | Radio frequency identification system using multiple band transmission | |
| TWI307038B (en) | Random number generator for radio frequency identifciation tag and seed number generator for generating a seed number for operation of the random number generator | |
| CN102024163B (en) | Anti-collision method with packet previewing mechanism | |
| US9940489B2 (en) | Radiofrequency transponder circuit | |
| US20100052862A1 (en) | Method for preventing signal collision in radio frequency identification system and radio frequency identification tag used thereof | |
| CN104331679B (en) | A kind of RFID tag anti-collision method based on physical-layer network coding | |
| CN1991859B (en) | Random number producer and its seed counting value producing unit | |
| CN101071471A (en) | Multi-label collision-proof method | |
| CN110430059A (en) | A kind of RF identifying safety communication means and labels implement methods | |
| CN102768733B (en) | Be applicable to the multi-label anti-collision algorithm of rfid system, rfid system and read write line | |
| EP1800446B1 (en) | Semiconductor device | |
| CN106886727A (en) | A kind of method of ultrahigh frequency electronic tag memory batch write-in | |
| CN104753835B (en) | A kind of channel parameter estimation implementation method of the fragment adjustment of the more receiving antennas of reader | |
| CN101346734B (en) | RFID system | |
| CN101470791A (en) | Radio frequency signal recognition and response method and system, label and reading device | |
| EP1580903B1 (en) | Semiconductor device | |
| CN101727565A (en) | Radio frequency identification system using multi-channel transmission to avoid packet collision | |
| CN1497408A (en) | Clock signal generating and data signal decoding circuit of contactless integrated circuit card | |
| CN203838734U (en) | Hand-held type internet of things terminal | |
| CN101236613A (en) | Electronic volume label, volume label identification system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20201230 |