CN102129586B - Information encoding method, method and device for transmitting information from reader-writer to label - Google Patents
Information encoding method, method and device for transmitting information from reader-writer to label Download PDFInfo
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Abstract
The embodiment of the invention provides an information encoding method, a method and a device for transmitting information from a reader-writer to a label. The information encoding method comprises the steps of: acquiring information source data, and encoding the information source data according to the following modes of: using a high-level pulse with a unit time duration to represent a code element 1 and using a low-level pulse with the unit time duration to represent a code element 0; using the two code elements 1 and 0 to represent a binary number 0 in the information source data; when an individual binary number 1 exists in the information source data, using the two code elements 1 and 1 to represent the binary number 1; and when the continuous binary numbers 1 exist in the information source data, using the two code elements 1 and 1 to represent the binary numbers 1 in odd bits and using the two code elements 0 and 1 to represent the binary numbers 1 in even bits. Compared with a mode of performing information transmission by using Manchester encoding and pulse interval encoding (PIE), by the method and the device provided by the embodiment of the invention which are used in a link from the reader-writer and the label of a radio frequency identification (RFID) system, more energy can be provided for the label, and an error rate is lower.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of information coding method, read write line to information transferring method and the device of label.
Background technology
The radio-frequency (RF) identification of the communications field (RFID, Radio Frequency Identification) technology is to utilize RF-wise to carry out telecommunication to reach the automatic identification technology of identify objects.This technology and current digitizing Mobile business adapt, and can realize automatic identification and remote real-time monitoring and management, are one of hot technologys in the modern information technology.During work, the RFID label is installed on the article that need authentication, this label sends identity information about these article to receiving trap by electromagnetic wave, and nearly all physical object can be followed the trail of and manage to rfid system by this working method.RFID is with a wide range of applications in various fields such as industrial automation, business automation, communications and transportation control and management, anti-counterfeiting technologies.
General radio-frequency recognition system is comprised of three parts, i.e. RFID label, read write line and data management system.For simplicity, hereinafter with the RFID label referred to as label.Read write line sends the radiofrequency signal of certain frequency by antenna, when label enters the perform region of antenna, energy is activated thereby label receives the radiofrequency signal acquisition, between label and read write line, set up communication, the information that label is preserved self sends to read write line, after read write line carries out the demodulation code to received signal, by interface with the information data transmission of label to data management system, different functions is carried out in the order of simultaneously also can the executing data management system sending.
Rfid system is according to whether comprising external power supply on the label, can be divided into the rfid system with active label and having rfid system two classes of passive label.Self does not have power supply passive label, so all required energy of passive label work must obtain from the radio-frequency carrier that read write line sends.In contrast, active radio frequency label comprises a battery, for the work of label provides all or part of energy.
In passive RFID system, the required energy of label work is to extract from the carrier wave that sends from read write line, and works in the backscattering mode.The RFID communication protocol that ultra-high frequency band is commonly used at present is ISO-18000-6B/C, and its read write line is respectively Manchester coding and PIE coding to the coded system of label emission.
The inventor finds in realizing process of the present invention, the Manchester coding can offer the required energy of label work, and as fixed-length coding, transfer efficiency is higher, but the high level dutycycle respectively is 50% in the sequence of symhols behind the coding, and capacity usage ratio is very low.The PIE coding also can offer the required energy of label work, but because different with the length that data 1 are encoded to the length of data 0 coding, need the sample circuit of a higher frequency to come coded identification is carried out sample count during decoding, by count value and a threshold ratio, decode data 0 and data 1, because the frequency ratio of digital baseband work is higher, will produce larger power consumption like this, and it is also larger the probability of error to occur.In addition, PIE encodes as non-isometric coding, also is unfavorable for the raising of data transmission efficiency.
Therefore, the energy problem of label becomes the bottleneck that the passive RFID technical feature promotes.
Summary of the invention
The embodiment of the invention provides a kind of information coding method, read write line information transferring method and device to label, to solve the energy problem of label.
The above-mentioned purpose of present embodiment is achieved by the following technical solution:
A kind of information coding method, described method comprises: obtain the information source data; According to following mode described information source data are encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the described information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01.
A kind of read write line is to the information transferring method of label, and described method is applied to the read write line of rfid system, and described method comprises: the continuous high level radio-frequency carrier of emission certain-length; If receive the identity code that label sends, then produce a frame synchronization sequence, described frame synchronization sequence is sent to described label; If receive the reception identifier that described label returns, then the instruction according to background control system produces the base band order, in such a way described base band order is encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the described information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; The carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label; If what receive that described label returns sets up identifier synchronously, then determine to set up with the synchronous communication of described label and finish.
A kind of read write line is to the information transferring method of label, and described method is applied to the label of rfid system, and described method comprises: when receiving the continuous high level radio-frequency carrier of read write line transmission, send identity code to described read write line; Receive frame synchronization sequence and preservation that described read write line returns; Send and receive identifier to described read write line, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns, described coding carries out in the following manner: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; If the frame synchronization sequence in the described carrier signal is identical with the frame synchronization sequence of preservation, then sends to described read write line and set up synchronously identifier; To the base band command decode behind the described coding and carry out described base band order.
A kind of read write line, described read write line comprises: transmitter unit, for the continuous high level radio-frequency carrier of emission certain-length; The first generation unit is used for producing a frame synchronization sequence behind the identity code that receives the label transmission; The first transmitting element is used for the frame synchronization sequence that described the first generation unit produces is sent to described label; The second generation unit is used for after receiving the reception identifier that described label returns, and produces the base band order according to the instruction of background control system; Coding unit, the base band order that is used in such a way described the second generation unit being produced is encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the described information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; The second transmitting element is used for comprising the frame synchronization sequence of described the first generation unit generation and the carrier signal of the base band order behind the described coding unit coding sends to described label; Determining unit, be used for receive that described label returns set up identifier synchronously the time, determine to set up with the synchronous communication of described label and finish.
A kind of label, described label comprises: the first transmitting element is used for sending identity code to described read write line when receiving the continuous high level radio-frequency carrier of read write line transmission; The first receiving element is used for receiving the frame synchronization sequence that described read write line returns; Storage unit is used for preserving the frame synchronization sequence that described the first receiving element receives; The second transmitting element is used for sending and receiving identifier to described read write line after described the first receiving element receives the frame synchronization sequence that described read write line returns; The second receiving element, be used for receiving that described read write line returns comprises the carrier signal of the base band order behind frame synchronization sequence and the coding, described coding carries out in the following manner: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; Comparing unit, the frame synchronization sequence of preserving for frame synchronization sequence and the described storage unit of the carrier signal that described the second receiving element is received compares; The 3rd transmitting element, for the comparative result at described comparing unit be, when the frame synchronization sequence that the frame synchronization sequence in the described carrier signal that described the second receiving element receives and described storage unit are preserved is identical, sends to described read write line and to set up synchronously identifier; Decoding unit, the base band command decode behind the coding that is used for described the second receiving element is received is also carried out described base band order.
A kind of rfid system, described system comprises read write line and label, described read write line is used for: the continuous high level radio-frequency carrier of outwards launching certain-length; When receiving the identity code of label transmission, produce a frame synchronization sequence, described frame synchronization sequence is sent to described label; When receiving the reception identifier that described label returns, instruction according to background control system produces the base band order, described base band order is encoded, described coding carries out in the following manner: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; The carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label; Receive that described label returns set up identifier synchronously the time, determine to set up with the synchronous communication of described label and finish; Described label is used for: when receiving the continuous high level radio-frequency carrier of read write line transmission, send identity code to described read write line; Receive frame synchronization sequence and preservation that described read write line returns; Send and receive identifier to described read write line, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns; When the frame synchronization sequence in described carrier signal is identical with the frame synchronization sequence of preservation, set up synchronously identifier to described read write line transmission; To the base band command decode behind the described coding and carry out described base band order.
The method and apparatus that uses the embodiment of the invention to provide in the link of label at the read write line of rfid system and uses carrying out communication with the PIE coding and comparing of Manchester coding, can provide more energy to label, and the bit error rate is lower.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, does not consist of limitation of the invention.In the accompanying drawings:
Fig. 1 is the process flow diagram of the information coding method of the embodiment of the invention;
The synoptic diagram of Fig. 2 for according to coding method embodiment illustrated in fig. 1 binary number 0 and 1 being encoded;
The instance graph of Fig. 3 for according to coding method embodiment illustrated in fig. 1 data being encoded;
Fig. 4 is used for the read write line of radio-frequency (RF) identification and the communication system synoptic diagram of label;
Fig. 5 is the read write line of use method provided by the invention and the structured flowchart of label;
A kind of read write line that Fig. 6 provides for the embodiment of the invention is to the information transferring method process flow diagram of label;
Fig. 7 is for using the high level dutycycle synoptic diagram of Manchester, PIE and three kinds of coding methods of the present invention;
Fig. 8 is for using the bit error rate contrast synoptic diagram of Manchester, PIE and three kinds of coding methods of the present invention;
Another read write line that Fig. 9 provides for the embodiment of the invention is to the information transferring method process flow diagram of label;
The composition frame chart of a kind of read write line that Figure 10 provides for the embodiment of the invention;
The composition frame chart of a kind of label that Figure 11 provides for the embodiment of the invention;
The composition frame chart of a kind of rfid system that Figure 12 provides for the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with embodiment and accompanying drawing, the embodiment of the invention is described in further details.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.
The process flow diagram of a kind of information coding method that Fig. 1 provides for the embodiment of the invention please refer to Fig. 1, and the method comprises:
Step 101: obtain the information source data;
Step 102: encode according to step 1021-step 1024 pair described information source data:
Step 1021: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length;
Step 1022: represent binary number 0 in the described information source data with two code elements 10;
Step 1023: when independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11;
Step 1024: when occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01.Also be, for a plurality of continuous binary numbers 1, primary binary number two code elements of 1 usefulness " 11 " represent, deputy binary number two code elements of 1 usefulness " 01 " represent, tertiary binary number two code elements of 1 usefulness " 11 " represent, binary number two code elements of 1 usefulness " 01 " of the 4th represent ..., by that analogy.In other words, represent binary number 0 with the high level pulse of a unit interval length and the low level pulse of a unit interval length, represent the binary number 1 of odd bits with the high level pulse of two unit interval length, represent the binary number 1 of even bit with the high level pulse of the low level pulse of a unit interval length and a unit interval length.
The synoptic diagram of Fig. 2 for according to coding method embodiment illustrated in fig. 1 binary number 0 and 1 being encoded, wherein Dperiod is code-element period, and HLW is the high level pulse of unit interval length, and it represents code element " 1 ", LLW is the low level pulse of unit interval length, and it represents code element " 0 ".Code element " 01 " expression low level at front high level rear; Rear, code element " 11 " represents two high level to " 10 " expression high level in front low level.
The instance graph of Fig. 3 for according to coding method embodiment illustrated in fig. 1 data being encoded illustrated among Fig. 3 binary data 0010100100000100 and 0110010111100101 coded graphics of carrying out.
The information coding method of present embodiment can be applied to read write line in the cataloged procedure of the base band order of label, by this coding method, can provide more energy for label, and improve information transfer efficiency.
Fig. 4 is used for the read write line of radio-frequency (RF) identification and the communication system synoptic diagram of label, please refer to Fig. 4, read write line 41 is emission ACK modulation signal outwards, when one or more labels 42 enter in the working range of read write line, can receive the radiofrequency signal of read write line 41 emissions, can return needed data message according to the order that receives; Read write line 41 is transferred to computer data management system 43 with it after receiving this data message.
Fig. 5 is the read write line of use method provided by the invention and the structured flowchart of label, please refer to Fig. 5, read write line 51 comprises the antenna 511 with reception and emission function, play the modulator-demodular unit 512 of modulation and demodulation effect, the codec 513 that is used for Code And Decode, for generation of the frame synchronization sequence generator 514 of frame synchronization sequence, and for generation of the read-write controller 515 of base band order and other order; Equally, label 52 also has antenna 521, modulator-demodular unit 522, codec 523, this label also comprises for the voltage doubling rectifing circuit 524 that radio-frequency carrier is changed into the needed voltage of label work in addition, be used for preserving the storer 525 of various data messages, and be used for the recording controller 526 of executing data read-write operation and the various flag code of generation.
A kind of read write line that Fig. 6 provides for the embodiment of the invention is to the information transferring method process flow diagram of label, and the method is applied to the read write line of rfid system, please refer to Fig. 6, and the method comprises:
Step 601: the continuous high level radio-frequency carrier of emission certain-length;
Wherein, read write line can outwards be launched by its antenna the continuous high level radio-frequency carrier of certain-length, and this carrier wave does not comprise any data message, and this length is minimum to be 8 code period.
Step 602: if receive the identity code that label sends, then produce a frame synchronization sequence, described frame synchronization sequence is sent to described label;
Wherein, after label receives this radio-frequency carrier, its inner voltage doubling rectifing circuit changes into the needed voltage of label work with this radio-frequency carrier, label is activated and produces the scale-of-two random number of a 0-15 position at this moment, if this random number is 0, then label will represent that directly the identity code of this label identity launches, if this random number is not 0, then label subtracts 1 operation to this random number automatically, this identity code is launched until this random number becomes at 0 o'clock again; If the random number that has two or more labels to produce is 0 simultaneously, bump this moment, be that read write line receives two or more identity codes simultaneously, this read write line sends the order that regenerates random number and does not carry out next step operation to corresponding a plurality of labels.
Wherein, after read write line receives the identity code of label, produce a frame synchronization sequence and send it to modulator-demodular unit by the frame synchronization sequence generator, it is modulated on the radio-frequency carrier, then send to label.Wherein this frame synchronization sequence can adopt any known structure, as long as it can realize setting up synchronous communication between take over party and the launch party, for example the frame synchronization sequence generator can produce frame synchronization sequence " 1010V1 " according to the 6C agreement, and wherein V represents to break rules.
Step 603: if receive the reception identifier that described label returns, then the instruction according to background control system produces the base band order, according to method embodiment illustrated in fig. 1 described base band order is encoded;
Wherein, label receives and it is carried out demodulation behind this frame synchronization sequence and it is saved in the storer, returns the reception identifier that an expression frame synchronization sequence finishes receiving to read write line simultaneously.
Wherein, after read write line received and receives identifier, its read-write controller produced the base band order according to the instruction of background control system, and its codec is encoded to this base band order.Wherein this coding method is as described below: the high level pulse with a unit interval length represents code element " 1 ", represents code element " 0 " with the low level pulse of a unit interval length; With the binary number 0 in two code elements " 10 " expression information source data; When independent binary number 1 occurring in the information source data, represent this binary number 1 with two code elements " 11 "; When continuous binary number 1 occurring in the information source data, with the binary number 1 of two code elements " 11 " expression odd bits, with the binary number 1 of two code elements " 01 " expression even bit; Namely for continuous binary number 1, primary binary number two code elements of 1 usefulness " 11 " represent, deputy binary number two code elements of 1 usefulness " 01 " represent, tertiary binary number two code elements of 1 usefulness " 11 " represent, binary number two code elements of 1 usefulness " 01 " of the 4th represent,, by that analogy.In other words, represent binary number 0 with the high level pulse of a unit interval length and the low level pulse of a unit interval length, represent the binary number 1 of odd bits with the high level pulse of two unit interval length, represent the binary number 1 of even bit with the high level pulse of the low level pulse of a unit interval length and a unit interval length.
Step 604: the carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label;
Wherein, by modulator-demodular unit the frame synchronization sequence of frame synchronization sequence generator generation and the base band order behind the coding are modulated on the radio-frequency carrier, send by antenna.Wherein frame synchronization sequence is attached to the front of base band order.
Step 605: if receive that described label returns set up synchronously identifier, then determine to set up with the synchronous communication of described label and finish.
Wherein, label carries out demodulation to the radio-frequency carrier signal of base band order that contains behind frame synchronization sequence and the coding that receives, the frame synchronization sequence of preserving in frame synchronization sequence after the demodulation and the storer is compared, if two sequences are identical, what then expression of label transmission was set up synchronously sets up identifier synchronously to read write line, between is set up synchronous communication thus, label is decoded to this base band order simultaneously, obtain needed base band command context, according to next step operation of this command execution; Otherwise label sends the timing error identifier of an expression timing error to read write line.
Wherein, if read write line receives this timing error identifier, then regenerate a frame synchronization sequence and send to label, in order to set up synchronous communication with label.Concrete communication process is identical with step 602-604, does not repeat them here.
In the present embodiment, the base band order of read write line emission and other various command all are that the read-write controller by read write line produces, and for example regenerate the order of random number; And the identity code of label emission and other various flag code (being various identifiers) all to be recording controller by label produce, for example set up synchronously identifier.
Read write line by present embodiment not only can improve the required energy supply problem of tab end normal operation to the information transferring method of label, can also increase the decipherment distance between read write line and label, reduces the bit error rate.
Clearer to the effect of the information transferring method of label for the read write line that makes present embodiment, be illustrated below in conjunction with the method for two application examples to present embodiment.
Fig. 7 please refer to Fig. 7 for using the high level dutycycle synoptic diagram of Manchester, PIE and three kinds of coding methods of the present invention.
Because the entrained energy size of sequence of symhols behind the coding is mainly decided by the high level dutycycle, the high level dutycycle in the sequence of symhols is larger, and then the energy that carries of this sequence of symhols is just more, also just can provide more energy to label.Therefore, only need to calculate the dutycycle of using the sequence of symhols after coding method of the present invention, Manchester method and PIE method are encoded to data, just can analyze which kind of information transferring method and can provide more energy to label.
In order to make things convenient for the calculating of back, suppose that signal source sends below binary data 0 and the binary data 1(referred to as data 0 and data 1) probability be the same, and the probability of the probability of transmission continuous data 1 and independent data 1 too, and the ratio that high and low level accounts for overall level is designated as respectively P
hAnd P
l
The high level dutycycle of knowing at first, at an easy rate the sequence of symhols of encoding according to Manchester is P
h=0.5.
Then, set up the PIE encoding model, the low level that connects a unit interval length with the high level of two continuous unit interval length represents data 1, namely uses three code elements " 110 " to represent data 1; The low level that connects a unit interval length with the high level of a unit interval length represents data 0, namely uses two code elements " 10 " to represent data 0.Then the high level dutycycle according to the sequence of symhols of PIE coding is: P
h=0.5*0.5+0.5*0.667=0.584.
And with coding method of the present invention data are encoded, when sending independent data 1, because these data 1 are with two code elements " 11 " expression, so the high level dutycycle of sequence of symhols is: P
h=0.5*0.5+0.5*1=0.75.When sending a plurality of continuous data 1, because with the data 1 of two code elements " 11 " expressions odd bits, represent the data 1 of even bit with two code elements " 01 ", so the high level dutycycle of sequence of symhols is: P
h=0.5*0.5+0.5*1+0.5*0.5*0.5=0.625.High level dutycycle to above-mentioned two situations is averaged: P
h=0.5*0.75+0.5*0.625=0.6875.
As shown in Figure 7, encode with coding method of the present invention, the high level dutycycle of sequence of symhols is maximum, can provide maximum energy to label.
In addition, pass through monte carlo method, coding method of the present invention, Manchester coding method and PIE coding method are applied to analyze in the passive RFID system, under MATLAB software, carry out time-domain analysis emulation, relatively their peak power, average power size.Obtain the energy comparison result that three kinds of coding methods shown in the table one provide.
| Coded system | Average power (dBm) | Peak power (dBm) |
| The Manchester coding method | ?0.587 | ?1.415 |
| The PIE coding method | ?0.608 | ?1.415 |
| Coding method of the present invention | ?0.619 | ?1.415 |
Table one
As can be seen from Table 1, the peak power of above-mentioned three kinds of coding methods is all the same, but the average power of coding method of the present invention is maximum, and the PIE coding method is taken second place, and the Manchester coding method is minimum.Therefore, read write line of the present invention can offer the maximum energy of label to the information transferring method of label.The energy that provides is higher, and the working range of read write line identification label is just larger, and the antijamming capability of communicating by letter between read write line and the label is stronger.
Fig. 8 is for using the bit error rate contrast synoptic diagram of Manchester, PIE and three kinds of coding methods of the present invention.Please refer to Fig. 8.
Because the bit error rate is to weigh the index that data are transmitted accuracy at the appointed time.Therefore the bit error rate can reflect a kind of quality of coding method, weighs its performance under different signal to noise ratio (S/N ratio)s and channel condition.
In this example, pass through monte carlo method, coding method of the present invention, Manchester coding method and PIE coding method are applied to analyze in the passive RFID system, under MATLAB software, carry out error performance emulation, relatively their bit error rate size.As shown in Figure 8, in communication process, the bit error rate of using coding method of the present invention to communicate is minimum, and what use Manchester coding method communicated takes second place, and it is the highest that use PIE coding method communicates.
In a word, the read write line for radio-frequency (RF) identification of the present invention has not only improved the required energy supply problem of tab end normal operation to the information transferring method of label, has increased the decipherment distance between read write line and label, and its bit error rate is also very low.
Although the present invention has introduced information transferring method of the present invention in the mode of specific embodiment, those skilled in the art knows, also can realize that read write line is to the message transmitting procedure of label with other communication steps.Any communication or the information transferring method that comprise coding method of the present invention all will drop within protection scope of the present invention.
A kind of read write line that Fig. 9 provides for the embodiment of the invention is to the process flow diagram of the information transferring method of label, and the method is applied to the label of rfid system, please refer to Fig. 9, and the method comprises:
Step 901: when receiving the continuous high level radio-frequency carrier of read write line transmission, send identity code to described read write line;
Step 902: receive frame synchronization sequence and preservation that described read write line returns;
Step 903: send and receive identifier to described read write line, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns;
Step 904: if the frame synchronization sequence in the described carrier signal is identical with the frame synchronization sequence of preservation, then sends to described read write line and set up synchronously identifier;
Step 905: to the base band command decode behind the described coding and carry out described base band order.
The method of present embodiment is corresponding to the information transferring method of label with the read write line that is applied to read write line embodiment illustrated in fig. 6, because in the embodiment shown in fig. 6, the course of work of label in information interactive process has been done detailed description to read write line and label, does not repeat them here.
In the embodiment shown in fig. 6, introduce read write line to the message transmitting procedure of label, do not introduce in detail label to the transmission course of read write line, this is because can realize that label is to the communication of read write line with any known transmission method and coding method, for example, label transmitting information is in the consideration of the processing power of label self during to read write line, usually uses simple Miller code method to carry out communication.
Read write line by present embodiment not only can improve the required energy supply problem of tab end normal operation to the information transferring method of label, can also increase the decipherment distance between read write line and label, reduces the bit error rate.
The function composition block diagram of a kind of read write line that Figure 10 provides for the embodiment of the invention please refer to Figure 10, and this read write line comprises:
Transmitter unit 1001 is for the continuous high level radio-frequency carrier of emission certain-length;
The first generation unit 1002 is used for producing a frame synchronization sequence behind the identity code that receives the label transmission;
The first transmitting element 1003 is used for the frame synchronization sequence that described the first generation unit 1002 produces is sent to described label;
The second generation unit 1004 is used for after receiving the reception identifier that described label returns, and produces the base band order according to the instruction of background control system;
Coding unit 1005, the base band order that is used in such a way described the second generation unit 1004 being produced is encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the described information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01;
The second transmitting element 1006 is used for comprising the frame synchronization sequence of described the first generation unit 1002 generations and the carrier signal of the base band order behind described coding unit 1005 codings sends to described label;
Determining unit 1007, be used for receive that described label returns set up identifier synchronously the time, determine to set up with the synchronous communication of described label and finish.
In one embodiment, described the first generation unit 1002 also is used for: when receiving the timing error identifier that described label returns, regenerate a frame synchronization sequence; Described the first transmitting element 1003 also is used for: the described frame synchronization sequence that regenerates is sent to described label, in order to set up synchronous communication with described label.
In one embodiment, the continuous high level radio-frequency carrier of the certain-length of described transmitter unit 1001 emissions does not comprise data message, and described certain-length is not more than 8 code period.
In one embodiment, the frame synchronization sequence that described the first generation unit 1002 produces is 10010V1, and wherein, V is for breaking rules.
In the present embodiment, transmitter unit 1001, the first transmitting element 1003, the second transmitting element 1006 can be realized by antenna and the modulator-demodular unit of read write line; The first generation unit 1002 can be realized by the frame synchronization sequence generator; The second generation unit 1004, determining unit 1007 can realize by read-write controller; Coding unit 1005 can be realized by codec.Because the structure constitute and function of this read write line is described in earlier figures 5 and Fig. 6, does not repeat them here.
By the read write line of present embodiment, not only can improve the required energy supply problem of tab end normal operation, can also increase the decipherment distance between read write line and label, reduce the bit error rate.
The composition frame chart of a kind of label that Figure 11 provides for the embodiment of the invention please refer to Figure 11, and this label comprises:
The first transmitting element 1101 is used for sending identity code to described read write line when receiving the continuous high level radio-frequency carrier of read write line transmission;
The first receiving element 1102 is used for receiving the frame synchronization sequence that described read write line returns;
The second transmitting element 1104 is used for sending and receiving identifier to described read write line after described the first receiving element receives the frame synchronization sequence that described read write line returns;
The second receiving element 1105 is used for receiving that described read write line returns comprises the carrier signal of the base band order behind frame synchronization sequence and the coding;
Comparing unit 1106, the frame synchronization sequence of preserving for frame synchronization sequence and the described storage unit 1103 of the carrier signal that described the second receiving element 1105 is received compares;
The 3rd transmitting element 1107, for the comparative result at described comparing unit 1106 be, when the frame synchronization sequence that the frame synchronization sequence in the carrier signal that described the second receiving element 1105 receives and described storage unit 1103 are preserved is identical, sends to described read write line and to set up synchronously identifier;
In one embodiment, described the 3rd transmitting element 1107 also is used at the comparative result of described comparing unit 1106, the frame synchronization sequence that frame synchronization sequence in the carrier signal that described the second receiving element 1105 receives and described storage unit 1103 are preserved sends the timing error identifier to described read write line not simultaneously.
In the present embodiment, the first transmitting element 1101, the first receiving element 1102, the second transmitting element 1104, the 3rd transmitting element 1107 can be realized by antenna and the modulator-demodular unit of label; Storage unit 1103 can realize by the storage unit of label; Comparing unit 1106 can be realized by the recording controller of label; Decoding unit 1108 can be realized by the codec of label.Because the structure constitute and function of this label is described in earlier figures 5 and Fig. 6, does not repeat them here.
By the label of present embodiment, not only can improve the required energy supply problem of tab end normal operation, can also increase the decipherment distance between read write line and label, reduce the bit error rate.
The composition frame chart of a kind of rfid system that Figure 12 provides for the embodiment of the invention please refer to Figure 12, and this rfid system comprises: read write line 1201 and label 1202, wherein:
Read write line 1201 is used for: the continuous high level radio-frequency carrier of outwards launching certain-length; When receiving the identity code of label transmission, produce a frame synchronization sequence, described frame synchronization sequence is sent to described label; When receiving the reception identifier that described label returns, instruction according to background control system produces the base band order, in such a way described base band order is encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the described information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; The carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label; Receive that described label returns set up identifier synchronously the time, determine to set up with the synchronous communication of described label and finish;
Label 1202 is used for: when receiving the continuous high level radio-frequency carrier of read write line transmission, send identity code to described read write line; Receive frame synchronization sequence and preservation that described read write line returns; Send and receive identifier to described read write line, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns; When the frame synchronization sequence in described carrier signal is identical with the frame synchronization sequence of preservation, set up synchronously identifier to described read write line transmission; To the base band command decode behind the described coding and carry out described base band order.
In the present embodiment, the communication process between read write line 1201 and the label 1202 may further comprise the steps:
Step 1: read write line 1201 is outwards launched the continuous high level radio-frequency carrier of certain-length by antenna, and this carrier wave does not comprise any data message.
Step 2: after label 1202 receives the described continuous high level radio-frequency carrier that read write line 1201 sends, therefrom obtain energy and be activated, send an identity code to read write line 1201.
Step 3: after read write line 1201 receives the identity code of label 1202, produce a frame synchronization sequence and it is modulated on the radio-frequency carrier, then send to this label 1202.
Step 4: label 1202 receives and it is carried out demodulation behind this frame synchronization sequence and it is saved in the storer, returns one for simultaneously read write line 1201 and receives identifier.
Step 5: after read write line 1201 receives and receives identifier, encode according to the instruction generation base band order of background control system and to it, the frame synchronization sequence of frame synchronization sequence generator generation and the base band order behind the coding are modulated on the radio-frequency carrier, send by antenna, wherein frame synchronization sequence is attached to the front of base band order; This specific coding method in the above part has been done detailed introduction, repeats no more here.
Step 6: 1202 pairs on label receives the radio-frequency carrier signal that contains frame synchronization sequence and base band order and carries out demodulation, the frame synchronization sequence of preserving in frame synchronization sequence after the demodulation and the storer is compared, if two sequences are identical, then label 1202 sends one and sets up synchronously identifier to read write line 1201, between is set up synchronous communication thus, simultaneously 1202 pairs of these base band orders of label are decoded, and obtain needed base band command context, according to next step operation of this command execution; Otherwise label sends a timing error identifier to read write line 1201.
Step 7: if read write line 1201 receives the timing error identifier, then re-execute described step 3-6 until set up synchronous communication.
The read write line 1201 of present embodiment can be realized by read write line shown in Figure 10, the label 1202 of present embodiment can be realized by label shown in Figure 11, since Figure 10 and embodiment illustrated in fig. 11 in, read write line and label are had been described in detail, do not repeat them here.
By the rfid system of present embodiment, not only can improve the required energy supply problem of tab end normal operation, can also increase the decipherment distance between read write line and label, reduce the bit error rate.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a read write line is to the information transferring method of label, and described method is applied to the read write line of rfid system, it is characterized in that, described method comprises:
The continuous high level radio-frequency carrier of emission certain-length;
If receive the identity code that label sends, then produce a frame synchronization sequence, described frame synchronization sequence is sent to described label;
If receive the reception identifier that described label returns, then the instruction according to background control system produces the base band order, in such a way described base band order is encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01;
The carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label;
If what receive that described label returns sets up identifier synchronously, then determine to set up with the synchronous communication of described label and finish.
2. method according to claim 1 is characterized in that, after the base band order behind described frame synchronization sequence and the described coding was sent to described label, described method also comprised:
If receive the timing error identifier that described label returns, then regenerate a frame synchronization sequence, and the described frame synchronization sequence that regenerates is sent to described label, in order to set up synchronous communication with described label.
3. method according to claim 1 is characterized in that, the continuous high level radio-frequency carrier of described certain-length does not comprise data message, and described certain-length is not more than 8 code period.
4. method according to claim 1 and 2 is characterized in that, described frame synchronization sequence is 10010V1, and wherein, V is for breaking rules.
5. a read write line is to the information transferring method of label, and described method is applied to the label of rfid system, it is characterized in that, described method comprises:
When receiving the continuous high level radio-frequency carrier of read write line transmission, send identity code to described read write line;
Receive frame synchronization sequence and preservation that described read write line returns;
Send and receive identifier to described read write line, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns, described coding carries out in the following manner: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01;
If the frame synchronization sequence in the described carrier signal is identical with the frame synchronization sequence of preservation, then sends to described read write line and set up synchronously identifier;
To the base band command decode behind the described coding and carry out described base band order.
6. method according to claim 5 is characterized in that:
If the frame synchronization sequence in the described carrier signal is different from the frame synchronization sequence of preservation, then send the timing error identifier to described read write line.
7. a read write line is characterized in that, described read write line comprises:
Transmitter unit is for the continuous high level radio-frequency carrier of emission certain-length;
The first generation unit is used for producing a frame synchronization sequence behind the identity code that receives the label transmission;
The first transmitting element is used for the frame synchronization sequence that described the first generation unit produces is sent to described label;
The second generation unit is used for after receiving the reception identifier that described label returns, and produces the base band order according to the instruction of background control system;
Coding unit, the base band order that is used in such a way described the second generation unit being produced is encoded: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01;
The second transmitting element is used for comprising the frame synchronization sequence of described the first generation unit generation and the carrier signal of the base band order behind the described coding unit coding sends to described label;
Determining unit, be used for receive that described label returns set up identifier synchronously the time, determine to set up with the synchronous communication of described label and finish.
8. read write line according to claim 7 is characterized in that:
Described the first generation unit also is used for: when receiving the timing error identifier that described label returns, regenerate a frame synchronization sequence;
Described the first transmitting element also is used for: the described frame synchronization sequence that regenerates is sent to described label, in order to set up synchronous communication with described label.
9. read write line according to claim 7 is characterized in that, the continuous high level radio-frequency carrier of the certain-length of described transmitter unit emission does not comprise data message, and described certain-length is not more than 8 code period.
10. according to claim 7 or 8 described read write lines, it is characterized in that the frame synchronization sequence that described the first generation unit produces is 10010V1, wherein, V is for breaking rules.
11. a label is characterized in that, described label comprises:
The first transmitting element is used for sending identity code to described read write line when receiving the continuous high level radio-frequency carrier of read write line transmission;
The first receiving element is used for receiving the frame synchronization sequence that described read write line returns;
Storage unit is used for preserving the frame synchronization sequence that described the first receiving element receives;
The second transmitting element is used for sending and receiving identifier to described read write line after described the first receiving element receives the frame synchronization sequence that described read write line returns;
The second receiving element, be used for receiving that described read write line returns comprises the carrier signal of the base band order behind frame synchronization sequence and the coding, described coding carries out in the following manner: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01;
Comparing unit, the frame synchronization sequence of preserving for frame synchronization sequence and the described storage unit of the carrier signal that described the second receiving element is received compares;
The 3rd transmitting element, for the comparative result at described comparing unit be, when the frame synchronization sequence that the frame synchronization sequence in the described carrier signal that described the second receiving element receives and described storage unit are preserved is identical, sends to described read write line and to set up synchronously identifier;
Decoding unit, the base band command decode behind the coding that is used for described the second receiving element is received is also carried out described base band order.
12. label according to claim 11 is characterized in that:
Described the 3rd transmitting element also is used at the comparative result of described comparing unit, the frame synchronization sequence that frame synchronization sequence in the carrier signal that described the second receiving element receives and described storage unit are preserved sends the timing error identifier to described read write line not simultaneously.
13. a rfid system, described system comprises read write line and label, it is characterized in that:
Described read write line is used for: the continuous high level radio-frequency carrier of outwards launching certain-length; When receiving the identity code of label transmission, produce a frame synchronization sequence, described frame synchronization sequence is sent to described label; When receiving the reception identifier that described label returns, instruction according to background control system produces the base band order, described base band order is encoded, described coding carries out in the following manner: the high level pulse with a unit interval length represents code element 1, represents code element 0 with the low level pulse of a unit interval length; Represent binary number 0 in the information source data with two code elements 10; When independent binary number 1 occurring in the described information source data, represent this binary number 1 with two code elements 11; When occurring continuous binary number 1 in the described information source data, represent the binary number 1 of odd bits with two code elements 11, represent the binary number 1 of even bit with two code elements 01; The carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label; Receive that described label returns set up identifier synchronously the time, determine to set up with the synchronous communication of described label and finish;
Described label is used for: when receiving the continuous high level radio-frequency carrier of read write line transmission, send identity code to described read write line; Receive frame synchronization sequence and preservation that described read write line returns; Send and receive identifier to described read write line, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns; When the frame synchronization sequence in described carrier signal is identical with the frame synchronization sequence of preservation, set up synchronously identifier to described read write line transmission; To the base band command decode behind the described coding and carry out described base band order.
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| CN105071912A (en) * | 2015-07-03 | 2015-11-18 | 华中科技大学 | Binary digital baseband code element communication method based on dual level |
| CN106330266B (en) * | 2016-08-16 | 2018-10-16 | 武汉万集信息技术有限公司 | A kind of timing optimization method of reader equipment and reader and label communication |
| CN116055001B (en) * | 2023-01-05 | 2024-06-18 | 北京中电普华信息技术有限公司 | Method and device for encoding and decoding uplink in backscatter communication system |
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| EP1522955A1 (en) * | 2003-10-07 | 2005-04-13 | Samsung Electronics Co., Ltd. | Mobile terminal circuit including an RFID tag and wireless identification method using the same |
| CN1862565A (en) * | 2005-05-11 | 2006-11-15 | 盛群半导体股份有限公司 | Coding format for passive RF identifying system |
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