CN101958724B - Shift m sequence family spread spectrum RFID air interface reader-writer network - Google Patents
Shift m sequence family spread spectrum RFID air interface reader-writer network Download PDFInfo
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- CN101958724B CN101958724B CN 200910041265 CN200910041265A CN101958724B CN 101958724 B CN101958724 B CN 101958724B CN 200910041265 CN200910041265 CN 200910041265 CN 200910041265 A CN200910041265 A CN 200910041265A CN 101958724 B CN101958724 B CN 101958724B
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Abstract
The invention relates to a shift m sequence family spread spectrum radio frequency identification (RFID) air interface reader-writer network and belongs to the field of short-haul communication. The RFID technology is related to the design of an ultra-high frequency (UHF) and microwave (MW) frequency band RFID air interface system and equipment. The invention provides a novel method for using theshift m sequence family spread spectrum RFID reader-writer network application. According to the requirement of using an RFID air interface multi-reader-writer in the same field, the invention provides the method of assigning shift m sequence family packets using the same primitive polynomial to a reader-writer group to build an RFID air interface reader-writer group synchronous orthogonal network. For the requirement on a larger-scale RFID air interface reader-writer network, the invention provides a multi-primitive polynomial networking method. A sequenced packet of the same primitive polynomial shift m sequence family provides the reader-writer group to form a synchronous orthogonal sub-network, and a quasi-orthogonal network is formed among sequenced packet sub-networks of a different primitive polynomial shift m sequence family.
Description
Technical field
The invention belongs to short haul connection field, radio-frequency (RF) identification (RFID) technology.With very high frequency(VHF) (VHF), hyperfrequency (UHF), microwave (MW) band RFID air interface system is relevant with the equipment design.
Short haul connection is one of new technical field of Showed Very Brisk in recent years.Wireless sensor network in this (WSN) and radio-frequency (RF) identification (RFID) technology are especially outstanding, have great industrial prospect.WSN and RFID belong to short haul connection together, so technical some general character that exists.
The evolution of radio-frequency (RF) identification (RFID) air interface technologies is from the low frequency to the high frequency, then to the carrier frequency lifting process of hyperfrequency and microwave, be also operating distance from contact to contactless, be applied to from induction field the evolution that radiation field is used.The most representative technical specification that is suitable in the world the radiation field application is the air interface communication parameter and standard ISO/IEC 18000-4/-6/-7 standard of radio-frequency (RF) identification (RFID) system., explicitly pointing out in the regulation about basic transmission system in these standards, Direct swquence spread spectrum (DSSS) is not adopted technology.Therefore,, have no the research and development achievement report of relevant Direct swquence spread spectrum (DSSS) technology in radio-frequency (RF) identification (RFID) air interface applies both at home and abroad.
Counter in the proposition linear feedback shift register replacement RFID of East China Normal University electronic tag is closely arranged, be used for control command and choose.The accurate orthogonal property that only not is not divided into the m sequence family of displacement that orthogonal sequence group and different primitive polynomial generate according to Phase shift m sequence family sets up in conjunction with the RFID application demand achievement in research report that spread-spectrum is replied the design of RFID network.
Enter very high frequency(VHF) (VHF), hyperfrequency (UHF), radio-frequency (RF) identification (RFID) air interface of microwave (MW) frequency range, due to the increasing of its operating distance, the service range of adaptation strengthens, and has produced the demand that the multi reader/writer networking is used.Present various rfid systems all do not possess required networking application function.
Direct swquence spread spectrum (DSSS) technology being widely used in other communication system is for example in cdma cellular mobile communication system IS-95, with overlength (2
52-1) position the m sequence as the time standard synchronous code, two length (2
15-1) the m sequence of position is as spread-spectrum code, with 64 Walsh codes as user's access code etc. these methods are too complicated for RFID.As seen, introduce Direct swquence spread spectrum (DSSS) technology in rfid system, and when the wireless zone networking, in the face of system synchronization, spread-spectrum, user's access, read write line code, a series of problems that need solution such as label temporary designator setting.
User demand same according to the rfid system multi reader/writer, the present invention proposes to use the grouping of longest linear feedback shift register sequence (m sequence) family sequence, the Phase shift m sequence group that provides each read write line to have quadrature, the read write line group that has the different Phase shift m sequence groups of displacement m sequence family of identical primitive polynomial builds the method that synchronized orthogonal RFID net uses.
Therefore often there are many primitive polynomials of a plurality of generation longest linear feedback shift register sequences (m sequence) according to the same stages number register, have a plurality of Phase shift m sequence family.The primitive polynomial that each produces longest linear feedback shift register sequence (m sequence) can produce (2
n-1) individual Phase shift m sequence provides grouping.Be quasi-orthogonal m sequence set between the Phase shift m sequence group of different primitive polynomials.The present invention proposes the Phase shift m sequence component dispensing read write line with different primitive polynomials, for the method for the accurate quadrature RFID net use that forms huge size.
The present invention proposes variable primitive polynomial m sequence family and variable m sequence of packets, the label design of random Selective sequence is used for the RFID net that forms huge size.
The present invention is based on the Phase shift m sequence orthogonality, form quadrature m sequence set.Utilize the orthogonal property of sequence set, cover by antenna beam, realize the orthogonal code grouping RFID net of similar cellular communication.Intensive for read write line, huge RFID network can be in scene a plurality of primitive polynomial sequence of use family, and networking is carried out in the binding sequence grouping.Build accurate quadrature RFID network.
The networking of shift m-sequences spread spectrum technology is used and may be run into more district's interference, because Phase shift m sequence has abundant orthogonal sequence resource, with reference to the cellular mobile communications networks design, can take refuge by the space layout configuration of adjusting sequence set and disturb generation.
The networking of shift m-sequences spread spectrum technology is used and is applicable to centralized short range network.Comprise radio-frequency (RF) identification (RFID), sensor network (WSN) etc.
Description of drawings
Fig. 1.Variable primitive polynomial, variable code character are selected m sequence generation schematic diagram at random
Fig. 1 provides is the variable primitive polynomial that development forms on longest linear feedback shift register basis, and variable code character is selected m sequence generation theory diagram at random.
Feedback function is determined by primitive polynomial.The output tap A of shift registers at different levels
1, A
2A
n2 carry system code 8 systems by primitive polynomial used are counted value.
The initial condition value of shift registers at different levels: the front portion is the read write line code, and the rear portion is the random number that label produces.Fig. 2.The networking of many primitive polynomials of RFID m sequence set
What Fig. 2 provided is many primitive polynomials, many m sequence set networking schematic diagram.As an example, provide the sequence A-K of family in figure, respectively corresponding primitive polynomial.Each sequence family has code and is respectively 000-111 totally 8 Phase shift m sequence groups.
Specific implementation method
1. the multi-form m sequence of many bases
Take length as 31 m sequences as example.Have 6 bases that can produce the m sequence and show formula more.These primitive polynomials and 2 carry system code 8 systems thereof are counted feedback factor respectively as following table:
| Primitive polynomial | 2 carry system code 8 systems are counted feedback factor | 8 systems are counted feedback factor |
| G(X)＝1+X 3+X 5 | 100 101 | 45 |
| G(X)＝1+X 2+X 5 | 101 001 | 51 |
| G(X)＝1+X 2+X 3+X 4+X 5 | 101 111 | 57 |
| G(X)＝1+X+X 3+X 4+X 5 | 110 111 | 67 |
| G(X)＝1+X+X 2+X 4+X 5 | 111 011 | 73 |
| G(X)＝1+X+X 2+X 3+X 5 | 111 101 | 75 |
The design calls control code take primitive polynomial and 2 carry system code 8 system numbers thereof as it.
2. variable primitive polynomial, the random Selective sequence label design of variable m sequence set
The linear feedback shift register primitive polynomial of label formation sequence used is by 2 carry system code 8 system numerical control systems of this primitive polynomial.
The front portion of the initial condition of label is determined by the read write line code.
The rear portion of the initial condition of label by label receive read write line reach instruction after, start the random number that randomizer produces and determine.
3. Networking Design
1) single primitive polynomial, many m sequence set RFID air interface reader-writer network
Single primitive polynomial, many m sequence set RFID air interface reader-writer network are with frequently, quadrature, time domain duplex (TDD) net.The different sequence set of the m sequence family that uses that same primitive polynomial generates are set up the RFID networks.Take one of them read write line as main read write line, for the whole network provides unified carrier frequency sources, transmitted signal clock reference and time division duplex are controlled.Other all read write lines is from read write line.Accept the unified carrier frequency sources of autonomous read write line, transmitted signal clock reference and time division duplex are controlled.The up period of time division duplex and descending period can be isometric or not isometric, and the time division duplex period control unification that belongs to all read write lines of same net is responsible for control by main read write line.
2) many primitive polynomials, many m sequence set RFID air interface reader-writer network
Many primitive polynomials, many m sequence set RFID air interface reader-writer network principle such as Fig. 2.Suppose that linear shift register length is N, the read write line code is 3, and same primitive polynomial has 2
(N-3)Individual quadrature Phase shift m sequence group is got same primitive polynomial 2
(N-3)Individual read write line is a group, and a plurality of primitive polynomial couplings consist of a plurality of read write line groups, and every group shares same primitive polynomial, has different Phase shift m sequence groups.Form many primitive polynomials, the networking of many m sequence set.Networking mode is many with frequently, time division duplex.Be the quadrature net between the read write line group of same primitive polynomial, the quadrature net is as the criterion between different primitive polynomial read write line groups.Network is established a control centre and is responsible for the whole network and provides unified carrier frequency sources, the transmitted signal clock
Benchmark and time division duplex are controlled.All read write lines of the whole network are accepted the unified carrier frequency sources of the whole network that control centre provides, and transmitted signal clock reference and time division duplex are controlled.The up period of time division duplex and descending period can be isometric or not isometric, and the time division duplex period control unification that belongs to all read write lines of same network is responsible for control by control centre.
Claims (4)
1. shift m-sequences spread spectrum RFID air interface reader-writer network method, it is characterized in that: use the grouping of longest linear feedback shift register sequence family sequence, the read write line group that has the different Phase shift m sequence groups of Phase shift m sequence family of identical primitive polynomial builds synchronized orthogonal RFID net;
There are a plurality of primitive polynomials in identical progression n linear feedback shift register, and each primitive polynomial can produce 2
n-1 Phase shift m sequence provides grouping, is quasi-orthogonal m sequence set between the Phase shift m sequence group of different primitive polynomials, with the Phase shift m sequence component dispensing read write line of different primitive polynomials, forms the accurate quadrature RFID net of huge size;
Select Phase shift m sequence family according to instruction, sequence set in sequence family, select at random the spread-spectrum of sequence to reply the electronic tag of design, with the read write line of the correlation reception Unit Design of the parallel receive of a plurality of a plurality of sequence extension frequency spectrums with corresponding Phase shift m sequence family and sequence set, realize that single primitive polynomial Phase shift m sequence family's reader-writer network or many primitive polynomials Phase shift m sequence family reader-writer network use.
2. shift m-sequences spread spectrum RFID air interface reader-writer network method according to claim 1 is characterized in that: single primitive polynomial, many m sequence set RFID air interface reader-writer network are with frequently, quadrature, time domain duplex net;
the different sequence set of the m sequence family that uses that same primitive polynomial generates are set up the RFID networks, take one of them read write line as main read write line, for the whole network provides unified carrier frequency sources, transmitted signal clock reference and time division duplex are controlled, other all read write lines is from read write line, accept the unified carrier frequency sources of autonomous read write line, transmitted signal clock reference and time division duplex are controlled, the up period of time division duplex and descending period can be isometric or not isometric, the time division duplex period control unification that belongs to all read write lines of same net is responsible for control by main read write line.
3. shift m-sequences spread spectrum RFID air interface reader-writer network method according to claim 1, it is characterized in that: many primitive polynomials, many m sequence set RFID air interface reader-writer network, each primitive polynomial quadrature Phase shift m sequence group consists of a read write line group;
a plurality of read write line groups, every group shares same primitive polynomial, networking mode is with frequently, time division duplex, be the quadrature net between the read write line group of same primitive polynomial, the quadrature net is as the criterion between different primitive polynomial read write line groups, network is established a control centre and is responsible for the whole network unified carrier frequency sources is provided, transmitted signal clock reference and time division duplex are controlled, all read write lines of the whole network are accepted the unified carrier frequency sources of the whole network that control centre provides, transmitted signal clock reference and time division duplex are controlled, the up period of time division duplex and descending period can be isometric or not isometric, the time division duplex period control unification that belongs to all read write lines of same network is responsible for control by control centre.
4. shift m-sequences spread spectrum RFID air interface reader-writer network method according to claim 1, it is characterized in that: the linear feedback shift register primitive polynomial of label formation sequence used is by 2 carry system code 8 system numerical control systems of this primitive polynomial.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1928884A (en) * | 2006-09-22 | 2007-03-14 | 东南大学 | Multi-address switch-in anti-collision method implemented in circuit shift method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1928884A (en) * | 2006-09-22 | 2007-03-14 | 东南大学 | Multi-address switch-in anti-collision method implemented in circuit shift method |
Non-Patent Citations (1)
| Title |
|---|
| 邹晨祎.线性反馈移位寄存器在射频识别技术中的应用.《华东师范大学学报（自然科学版）》.2008,(第1期), * |
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