CN101989329B - Data encoding method applying in radio frequency identification system - Google Patents

Data encoding method applying in radio frequency identification system Download PDF

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CN101989329B
CN101989329B CN201010536164A CN201010536164A CN101989329B CN 101989329 B CN101989329 B CN 101989329B CN 201010536164 A CN201010536164 A CN 201010536164A CN 201010536164 A CN201010536164 A CN 201010536164A CN 101989329 B CN101989329 B CN 101989329B
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binary data
adopt
saltus step
encoded
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CN101989329A (en
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李建成
任天鹏
王宏义
庄钊文
唐朝京
许拔
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Tianjin Kunpeng Information Technology Co ltd
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National University of Defense Technology
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Abstract

The invention provides a data transmission method applied to a label end in a passive radio-frequency identification system, which has the technical scheme that codes with the same length are adopted for a binary datum 0 and a binary datum 1, in addition, the binary datum 0 is coded in a high-level or low-level coding mode without jumping at a middle phase, and the binary datum 1 is coded in a rising-edge or trailing-edge coding mode with jumping at a middle phase. Through the coding method provided by the invention, the phase jumping between coding waveforms of two adjacent binary data in the coding process can be avoided for solving the problem of phase jumping between the coding waveforms of the two adjacent binary data in the existing coding method.

Description

A kind of data-encoding scheme that is applied in the radio-frequency recognition system
Technical field
The invention belongs to the RF identification communication technical field, be specifically related to a kind of data-encoding scheme that is applied in the radio-frequency recognition system.
Background technology
RF identification (Radio Frequency Identification, RFID) communication technology is a kind of non-contact automatic identification technology; Rfid system mainly is made up of label, read write line and computer network system.Read write line communicates through radiofrequency signal and label, obtains the identifying information of storing on the label, through computer network system the label information that reads is managed and information transmission simultaneously.
Rfid system can be divided into two types: passive RFID system and active RFID system, both key distinctions are in tab end.The labeling requirement of passive RFID system is obtained energy from the radiofrequency signal that the read write line emission comes, and the label of active RFID system self can provide energy.
In passive RFID system, the radio-frequency carrier signal of read write line utilization after coding and modulation sends to label, and label is modulated to backward scattered signal after answer signal is encoded, and sends to read write line then.In the RFID international standard, such as among the ISO 18000-6A/B/C, label is sending to data message the mode of encoding before the read write line normally FM0 or Miller coding.But have phase hit between the coding waveforms of latter two binary data of FM0 coding, jumping probability is 100%; Also have phase hit between the coding waveforms of latter two binary data 0 of Miller coding, jumping probability is 25%.Phase hit will cause spectrum energy to be revealed, and signal spectrum broadens.
Summary of the invention
Fundamental purpose of the present invention is; The data-encoding scheme that is applied to tab end in the passive RFID system is provided; There is not phase hit between the coding waveforms of two binary data that feasible coding back is adjacent, there to be the problem of phase hit between the coding waveforms that solves two adjacent in existing coding method binary data.
Technical scheme of the present invention is, a kind of data-encoding scheme is applied to the tab end of passive RFID system, it is characterized in that, comprises the steps:
Suppose S 1The high level of not saltus step of expression intermediate phase, S 2The negative edge of expression intermediate phase saltus step, S 3The rising edge of expression intermediate phase saltus step, S 4The low level of not saltus step of expression intermediate phase; And
Binary data 0 and binary data 1 are adopted the equal length coding; And
If first bit of the sequence of armed binary data is 0, then adopt S 1Coding; If first bit of armed binary data sequence is 1, then adopt S 2Coding; And
If follow-up armed binary data is 0,
If adopt S before 1Encoded binary data 0 then adopt S 1Coding;
If adopt S before 4Encoded binary data 0 then adopt S 4Coding;
If adopt S before 2Encoded binary data 1 then adopt S 4Coding;
If adopt S before 3Encoded binary data 1 then adopt S 1Coding;
If follow-up armed binary data is 1,
If adopt S before 1Encoded binary data 0 then adopt S 2Coding;
If adopt S before 4Encoded binary data 0 then adopt S 3Coding;
If adopt S before 2Encoded binary data 1 then adopt S 3Coding;
If adopt S before 3Encoded binary data 1 then adopt S 2Coding.
Location swap with binary data in the technique scheme 0 and binary data 1 can form the new technical scheme that has same technique effect with technique scheme.
The invention has the beneficial effects as follows: adopted the coded system of continuous phase, having the probability of phase hit between the coding waveforms of feasible coding back binary data is 0%; Compare with FM0, Miller coding method, exist the probability of phase hit all to reduce by 100% and 100% between the coding waveforms of coding back binary data; Under the identical prerequisite of data rate, the signal spectrum energy is more concentrated, and frequency spectrum is narrower.
Description of drawings
Fig. 1 is the binary data coding baseband signalling synoptic diagram of an embodiment of the present invention;
The binary data coding state transition diagram that Fig. 2 provides for technical scheme 1 of the present invention;
Fig. 3 for binary data coding in a kind of embodiment of technical scheme 1 of the present invention after baseband signalling sequence synoptic diagram;
Fig. 4 is the baseband signalling sequence synoptic diagram of FM0 coding;
Fig. 5 is the baseband signalling sequence synoptic diagram of Miller coding;
Fig. 6 is the binary data coding base-band signal spectrum comparison diagram that three kinds of coding methods obtain.
Embodiment
To combine accompanying drawing and embodiment that coding method of the present invention is described in detail below.
Fig. 1 is the binary data coding baseband signalling synoptic diagram of an embodiment of the present invention, and the horizontal ordinate of wherein every width of cloth figure is a time shaft, and ordinate is an amplitude axis, (a) the high level S of not saltus step of expression intermediate phase 1, (b) the negative edge S of expression intermediate phase saltus step 2, (c) the rising edge S of expression intermediate phase saltus step 3, (d) the low level S of not saltus step of expression intermediate phase 4Technical scheme 1 provided by the invention is the S with binary data 0 not saltus step of usefulness intermediate phase 1Or S 4Coding, the S of binary data 1 usefulness intermediate phase saltus step 2Or S 3Coding; 2 of technical schemes are the S with binary data 0 usefulness intermediate phase saltus step 2Or S 3Coding, the S of binary data 1 not saltus step of usefulness intermediate phase 1Or S 4Coding.
The binary data coding state transition diagram that Fig. 2 provides for technical scheme 1 of the present invention, wherein:
If ◇ is the current S that is in 1State
When receiving binary data 0: state transitions is to S 1, thereby state transitions does not have phase hit;
When receiving binary data 1: state transitions is to S 2, thereby state transitions does not have phase hit.
If ◇ is the current S that is in 2State
When receiving binary data 0: state transitions is to S 4, thereby state transitions does not have phase hit;
When receiving binary data 1: state transitions is to S 3, thereby state transitions does not have phase hit.
If ◇ is the current S that is in 3State
When receiving binary data 0: state transitions is to S 1, thereby state transitions does not have phase hit;
When receiving binary data 1: state transitions is to S 2, thereby state transitions does not have phase hit.
If ◇ is the current S that is in 4State
When receiving binary data 0: state transitions is to S 4, thereby state transitions does not have phase hit;
When receiving binary data 1: state transitions is to S 3, thereby state transitions does not have phase hit.
Fig. 3 utilizes in a kind of embodiment of technical scheme 1 of the present invention baseband signalling sequence synoptic diagram behind the binary data coding, and wherein: binary data sequence 00 adopts S 1S 1Or S 4S 4Coding; Binary data sequence 01 adopts S 1S 2Or S 4S 3Coding; Binary data sequence 10 adopts S 2S 4Or S 3S 1Coding; Binary data sequence 11 adopts S 2S 3Or S 3S 2Coding.Obviously, (T constantly) do not have phase hit between the coding waveforms of two binary numbers, and jumping probability is 0%.
Fig. 4 is the baseband signalling sequence synoptic diagram of FM0 coding, and wherein: binary data sequence 00 adopts S 2S 2Or S 3S 3Coding; Binary data sequence 01 adopts S 2S 1Or S 3S 4Coding; Binary data sequence 10 adopts S 1S 3Or S 4S 2Coding; Binary data sequence 11 adopts S 1S 4Or S 4S 1Coding.Obviously, between the FM0 coding waveforms of two binary numbers (T constantly) necessarily to have phase hit, the probability of saltus step be 100%.
Fig. 5 is the baseband signalling sequence synoptic diagram of Miller coding, and wherein: binary data sequence 00 adopts S 1S 4Or S 4S 1Coding; Binary data sequence 01 adopts S 1S 2Or S 4S 3Coding; Binary data sequence 10 adopts S 2S 4Or S 3S 1Coding; Binary data sequence 11 adopts S 2S 3Or S 3S 2Coding.Obviously; After binary data sequence carried out Miller coding; Have only (T constantly) phase place generation saltus step between the coding waveforms of binary data sequence 00, other situation comprise that saltus step does not take place (T constantly) phase place between the coding waveforms of binary data sequence 01,10,11.So the probability of phase hit is 25% between the coding waveforms of Miller when coding binary data.
Fig. 6 is the binary data coding base-band signal spectrum comparison diagram that three kinds of coding methods obtain; Comprise digital coding base-band signal spectrum of the present invention 601, FM0 coded baseband signal frequency spectrum 602 and Miller coded baseband signal frequency spectrum 603; Wherein horizontal ordinate is a numerical frequency, and ordinate is a frequency spectrum normalization amplitude.Because with respect to FM0 and Miller coding, the coding waveforms of binary data does not have phase hit when using coding method of the present invention, so signal spectrum is narrower, energy is more concentrated.

Claims (2)

1. data-encoding scheme is applied to the tab end of passive RFID system, it is characterized in that, comprises the steps:
Suppose S 1The high level of not saltus step of expression intermediate phase, S 2The negative edge of expression intermediate phase saltus step, S 3The rising edge of expression intermediate phase saltus step, S 4The low level of not saltus step of expression intermediate phase; And
Binary data 0 and binary data 1 are adopted the equal length coding; And
If first bit of the sequence of armed binary data is 0, then adopt S 1Coding; If first bit of armed binary data sequence is 1, then adopt S 2Coding; And
If follow-up armed binary data is 0,
If adopt S before 1Encoded binary data 0 then adopt S 1Coding;
If adopt S before 4Encoded binary data 0 then adopt S 4Coding;
If adopt S before 2Encoded binary data 1 then adopt S 4Coding;
If adopt S before 3Encoded binary data 1 then adopt S 1Coding;
If follow-up armed binary data is 1,
If adopt S before 1Encoded binary data 0 then adopt S 2Coding;
If adopt S before 4Encoded binary data 0 then adopt S 3Coding;
If adopt S before 2Encoded binary data 1 then adopt S 3Coding;
If adopt S before 3Encoded binary data 1 then adopt S 2Coding.
2. data-encoding scheme is applied to the tab end of passive RFID system, it is characterized in that, comprises the steps:
Suppose S 1The high level of not saltus step of expression intermediate phase, S 2The negative edge of expression intermediate phase saltus step, S 3The rising edge of expression intermediate phase saltus step, S 4The low level of not saltus step of expression intermediate phase; And
Binary data 0 and binary data 1 are adopted the equal length coding; And
If first bit of the sequence of armed binary data is 1, then adopt S 1Coding; If first bit of armed binary data sequence is 0, then adopt S 2Coding; And
If follow-up armed binary data is 1,
If adopt S before 1Encoded binary data 1 then adopt S 1Coding;
If adopt S before 4Encoded binary data 1 then adopt S 4Coding;
If adopt S before 2Encoded binary data 0 then adopt S 4Coding;
If adopt S before 3Encoded binary data 0 then adopt S 1Coding;
If follow-up armed binary data is 0,
If adopt S before 1Encoded binary data 1 then adopt S 2Coding;
If adopt S before 4Encoded binary data 1 then adopt S 3Coding;
If adopt S before 2Encoded binary data 0 then adopt S 3Coding;
If adopt S before 3Encoded binary data 0 then adopt S 2Coding.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN107221064A (en) * 2014-10-21 2017-09-29 杭州追猎科技有限公司 The coding method of the intelligent lock system communicated based on smart mobile phone vibration frequency

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102946255B (en) * 2012-10-17 2016-04-20 中国人民解放军国防科学技术大学 For the code and decode method of passive radio frequency identification system
CN105553624B (en) * 2015-12-31 2019-04-05 广西大学 A kind of predictable data communication coding
CN109347605B (en) * 2018-11-12 2021-06-04 北京和利时系统工程有限公司 Encoding method, decoding method and device, and computer readable storage medium

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CN101136052A (en) * 2006-09-30 2008-03-05 中兴通讯股份有限公司 Method for transmitting information from reader used for recognizing radio frequency to label
CN101616109A (en) * 2008-06-27 2009-12-30 中兴通讯股份有限公司 A kind of data transmission method
CN101620663A (en) * 2008-07-02 2010-01-06 中兴通讯股份有限公司 Data transmitting method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101136052A (en) * 2006-09-30 2008-03-05 中兴通讯股份有限公司 Method for transmitting information from reader used for recognizing radio frequency to label
CN101616109A (en) * 2008-06-27 2009-12-30 中兴通讯股份有限公司 A kind of data transmission method
CN101620663A (en) * 2008-07-02 2010-01-06 中兴通讯股份有限公司 Data transmitting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107221064A (en) * 2014-10-21 2017-09-29 杭州追猎科技有限公司 The coding method of the intelligent lock system communicated based on smart mobile phone vibration frequency
CN107221064B (en) * 2014-10-21 2021-03-02 深圳移联翼通讯设备有限公司 Coding method of intelligent lock system based on vibration frequency communication of intelligent mobile phone

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Address after: 300459, No. 399, Xiang Xiang Road, Tanggu hi tech Zone, Tianjin Binhai New Area

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