CN102185817B - Method and device for transmitting information from reader-writer to label - Google Patents
Method and device for transmitting information from reader-writer to label Download PDFInfo
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- CN102185817B CN102185817B CN 201110052434 CN201110052434A CN102185817B CN 102185817 B CN102185817 B CN 102185817B CN 201110052434 CN201110052434 CN 201110052434 CN 201110052434 A CN201110052434 A CN 201110052434A CN 102185817 B CN102185817 B CN 102185817B
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Abstract
The embodiment of the invention provides a method and a device for transmitting information from a reader-writer to a label. The method comprises the following steps of: transmitting a continuous high-level radio frequency carrier with a certain length; if an identification code is received from the label, generating a frame synchronization sequence, and transmitting the frame synchronization sequence to the label, wherein the frame synchronization sequence comprises a delimiter representative of an initial point of the frame synchronization sequence, two calibration symbols for calibrating reference frequency, and data information; if a receiving identifier returned by the label is received, generating a base band command according to an instruction of a background control system, codingthe base band command, and transmitting a carrier signal comprising the frame synchronization sequence and the coded base band command; and if a synchronization establishment identifier returned by the label is received, determining that the establishment of synchronous communication with the label is finished. By the method and the device, the self-calibration of the reference frequency can be realized, thereby reducing the power consumption of a chip.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of 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 digitlization Mobile business adapt, and can realize automatic identification and remote real-time monitoring and management, are one of hot technologys in the contemporary 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 system 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 made up of three parts, i.e. RFID label, read write line and back-end data management system.For simplicity, hereinafter abbreviate the RFID label as label.Read write line sends the radiofrequency signal of certain frequency by antenna, when label enters the working region of antenna, energy is activated thereby label receives the radiofrequency signal acquisition, between label and read write line, set up communication, label sends to read write line with the information of self preserving, and after read write line carries out the demodulation sign indicating number to received signal, gives the back-end data management system by interface with the information data transmission of label, simultaneously also can carry out the order that data management system is sent, carry out different functions.
Be a very important technical problem synchronously in the RFID communication process, read write line and labeling requirement act in agreement ground co-ordination, this just must have synchro system to guarantee.Need realize by a frame swynchronization code synchronously, itself does not comprise the data message of label this frame swynchronization code, could begin data information but have only by this frame swynchronization code after having set up synchronously between the transceiver, be necessity and the prerequisite of carrying out the information transmission so set up synchronously.The quality of net synchronization capability will directly affect the performance of communication again, if synchronous error or lose will cause communication performance to descend or communication disruption synchronously.Therefore, realize stable, the communication rapidly of RFID communication system, the synchronism between needing to guarantee to receive and send.
The inventor finds in realizing process of the present invention, at present in the ISO18000-6C agreement, by the number of samples of TRcal () is counted, thereby determines the data rate of return link.In this way, the size of reference frequency has determined the precision of the data rate of return link, and reference frequency is more big, and the precision of return link data rate is also just more high, but big reference frequency can cause big power consumption to produce.Can increase the stability that temperature-compensation circuit improves reference frequency in the analog circuit, but this complexity and the chip power-consumption of chip design have been increased.In addition, only defined a delimiter that time span is 12.5us in the ISO18000-6C standard, label after powering at every turn, after receiving delimiter calibration value is write ram in slice, when adopting the similar non-square pulse of PR-ASK or other, the label sampling time can not guarantee the delimiter in the frame swynchronization code is reverted to the time span of 12.5us, makes the reference frequency error, can cause the error rate height of communication process.
Summary of the invention
The embodiment of the invention provides information transferring method and the device of a kind of read write line to label, to solve read write line to the stationary problem of label.
The above-mentioned purpose of the embodiment of the invention is achieved by the following technical solution:
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, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; If receive the reception identifier that described label returns, then the instruction according to the back bench control system produces the base band order, and described base band order encoded, 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 the continuous high level radio-frequency carrier that receives that read write line sends, send identity code to described read write line; Receive the frame synchronization sequence that described read write line returns and preserve, wherein, described frame synchronization sequence comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated; Obtain the reference frequency calibration value according to described frame synchronization sequence, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration; Send to described read write line and to receive identifier, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns; 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 identifier synchronously; 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; First generation unit, be used for behind the identity code that receives the label transmission, produce a frame synchronization sequence, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; First transmitting element is used for the frame synchronization sequence that described first generation unit produces is sent to described label; 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 back bench control system; Coding unit is used for the base band order that described second generation unit produces is encoded; Second transmitting element is used for comprising the frame synchronization sequence of described 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: first transmitting element is used for sending identity code to described read write line when the continuous high level radio-frequency carrier that receives that read write line sends; First receiving element, be used for after described read write line sends identity code, receiving the frame synchronization sequence that described read write line returns at described first transmitting element, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; Memory cell is used for the frame synchronization sequence that described first receiving element of storage receives; Alignment unit, the frame synchronization sequence that is used for receiving according to described first receiving element obtains the reference frequency calibration value, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration; Second transmitting element is used for sending the reception identifier to described read write line behind described alignment unit self calibration; Second receiving element 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 after described second transmitting element sends described reception identifier to described read write line; Comparing unit, the frame synchronization sequence of preserving for frame synchronization sequence and the described memory cell of the described carrier signal that described 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 second receiving element receives and described memory cell are preserved is identical, sends to described read write line and to set up identifier synchronously; Decoding unit, the base band command decode behind the coding that is used for described 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, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; When receiving the reception identifier that described label returns, instruction according to the back bench control system produces the base band order, and described base band order encoded, 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 the continuous high level radio-frequency carrier that receives that read write line sends, send identity code to described read write line; Receive the frame synchronization sequence that described read write line returns and preserve, wherein, described frame synchronization sequence comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated; Obtain the reference frequency calibration value according to described frame synchronization sequence, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration; Send to described read write line and to receive identifier, 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 identifier synchronously 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, can realize the reference frequency self calibration by frame synchronization sequence of the present invention, label does not need to increase temperature-compensation circuit, saved the area of label chip, thereby reduced chip power-consumption, and can under different temperatures, humidity situation, still can guarantee the stable of reference frequency, thereby guaranteed read write line and label can act in agreement the ground co-ordination, but also make that the error rate in the communication process is very low.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is used for the read write line of radio-frequency (RF) identification and the communication system schematic diagram of label;
Fig. 2 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. 3 provides for the embodiment of the invention is to the information transferring method flow chart of label;
The frame synchronization sequence schematic diagram of Fig. 4 present embodiment;
The schematic diagram of the improved Manchester's code method that Fig. 5 provides for present embodiment;
Fig. 6 is the emulation experiment curve chart of the communication mode of three kinds of different frame synchronizing sequences of employing;
Another read write line that Fig. 7 provides for the embodiment of the invention is to the flow chart of the information transferring method of label;
The function composition frame chart of a kind of read write line that Fig. 8 provides for the embodiment of the invention;
The composition frame chart of a kind of label that Fig. 9 provides for the embodiment of the invention;
The composition frame chart of a kind of rfid system that Figure 10 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.
Fig. 1 is used for the read write line of radio-frequency (RF) identification and the communication system schematic diagram of label, please refer to Fig. 1, read write line 11 is emission ACK modulation signal outwards, when one or more labels 12 enter in the working range of read write line, can receive the radiofrequency signal of read write line 11 emissions, can return needed data message according to the order that receives; Read write line 11 is transferred to computer data management system 13 with it after receiving this data message.
Fig. 2 is the read write line of use method provided by the invention and the structured flowchart of label, please refer to Fig. 2, read write line 21 comprises the antenna 211 with reception and emission function, play the modulator-demodulator 212 of modulation and demodulation effect, the codec 213 that is used for Code And Decode, for generation of the frame synchronization sequence generator 214 of frame synchronization sequence, and for generation of the read-write controller 215 of base band order and other order; Equally, label 22 also has antenna 221, modulator-demodulator 222, codec 223, this label also comprises for the voltage doubling rectifing circuit 224 that radio-frequency carrier is changed into the needed voltage of label work in addition, be used for preserving the memory 225 of various data messages and be used for carrying out data read-write operation and the recording controller 226 that produces various flag code.
A kind of read write line that Fig. 3 provides for the embodiment of the invention is to the flow chart of the information transferring method of label, and this method is applied to the read write line of rfid system, please refer to Fig. 3, and this method comprises:
Step 301: the continuous high level radio-frequency carrier of emission certain-length;
Wherein, read write line can outwards be launched the continuous high level radio-frequency carrier of certain-length by its antenna, and this carrier wave does not comprise any data message, and this length is minimum to be 8 code period.
Step 302: if receive the identity code that label sends, then produce a frame synchronization sequence, described frame synchronization sequence is sent to described label;
Wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated.
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 binary system 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, becomes at 0 o'clock up to this random number and this identity code is launched 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 produces random number again 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-demodulator by the frame synchronization sequence generator, it is modulated on the radio-frequency carrier, send to label then.Wherein this frame synchronization sequence comprises following three parts: a) delimiter of the starting point of an expression frame synchronization sequence, and it is the low level of T for time span, this time span T is determined by the data transfer rate size of read write line, usually between 8.25-25us; B) two calibrations that are used for reference frequency is calibrated accord with, and represent a calibration symbol with a high level and a low level, and time span of each calibration symbol all equates with the time span of delimiter; C) data message, it comprises binary data 0 with two code elements " 10 " expressions, the binary system fault data of representing with the binary data 1 of two code elements " 11 " expression, with two continuous high level of unit interval length and the binary data of representing with two code elements " 01 " 1, be used for setting up read write line to the synchronous communication of label, wherein represent code element " 1 " with the high level pulse of a unit interval length, represent code element " 0 " with the low level pulse of a unit interval length.
Fig. 4 is the frame synchronization sequence schematic diagram of present embodiment, the structure of the frame synchronization sequence of present embodiment as seen from the figure: one is the delimiter that the low level of T is represented with time length; Two calibration symbols are represented a calibration symbol with a high level and a low level, and the time span of each calibration symbol all equates with the time span of delimiter; With the binary system fault data represented by two continuous high level of unit interval length by the binary data 0 of two code elements " 10 " expressions, by the binary data 1 of two code elements " 11 " expression, one with by the such order permutation and combination data message together of the binary data 1 of two code elements " 01 " expression, wherein represent code element " 1 " with the high level pulse of a unit interval length, represent code element " 0 " with the low level pulse of a unit interval length.The frame synchronization sequence of present embodiment has comprised situation about breaking rules, the false synchronous probability in the time of can reducing synchronous communication.Through experiment showed, that the auto-correlation function of this data message has sharp-pointed unimodal characteristic, autocorrelation is very high, can reach more than the 5.12dB.And can realize the reference frequency self calibration by the frame synchronization sequence of present embodiment, label does not just need to increase temperature-compensation circuit, has saved the area of label chip, thereby has reduced chip power-consumption, makes that also the error rate in the communication process is very low.
Although the binary system fault data in the frame synchronization sequence structure shown in Fig. 3 are 1, but those skilled in the art knows, binary system fault data in the frame synchronization sequence structure of present embodiment also can be for a plurality of, and its concrete number is determined by different coded systems.
In the present embodiment, can use any attainable coded system to come data are encoded, for example Manchester's code (Manchester) and PIE coding, Miller code etc. do not repeat them here.Present embodiment provides a kind of improved Manchester's code method to be specifically described below.
The schematic diagram of the improved Manchester's code method that Fig. 5 provides for present embodiment, its cryptoprinciple is: represent code element " 1 " with the high level pulse of a unit interval length, represent 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 " are represented, deputy binary number two code elements of 1 usefulness " 01 " are represented, tertiary binary number two code elements of 1 usefulness " 11 " are represented, binary number two code elements of 1 usefulness " 01 " of the 4th are represented,, 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.
According to above-mentioned coding method encoded binary several 0 and 1 as shown in Figure 5, wherein Dperiod is code-element period, and HLW is the high level pulse of unit interval length, and it represents code element " 1 ", and LLW is the low level pulse of unit interval length, and it represents code element " 0 ".Code element " 01 " expression low level preceding high level after; " 10 " expression high level preceding low level after, two high level of code element " 11 " expression.
When the improved Manchester's code method that adopts present embodiment to provide is encoded to data, fault data in the frame synchronization sequence of present embodiment can be 1, adopt this frame alignement pattern just can reduce the false synchronous probability of communicating by letter between read write line and the label greatly, this is because read write line adopts described improved Manchester's code method that data are encoded, occur the high level of continuous three unit interval length in the base band order behind the coding at most, and continuous four high level (see figure 3)s are arranged in the frame synchronization sequence of present embodiment.Just can distinguish base band order and frame synchronization sequence by the number of judging continuous high level, thereby when communication, the identical probability of base band order and frame synchronization sequence occur and reduce greatly, namely false synchronous probability reduces greatly.The false synchronous method of this judgement also is applicable to other coding method, and the number of the binary system fault data in the frame synchronization sequence structure of present embodiment is determined by different coded systems.
Step 303: if receive the reception identifier that described label sends, then the instruction according to the back bench control system produces the base band order, described base band order is encoded, and the carrier signal that will comprise the base band order behind described frame synchronization sequence and the described coding sends to described label;
Wherein, label carries out demodulation to it after receiving this frame synchronization sequence, obtain the reference frequency calibration value, according to this reference frequency calibration value the reference frequency in the label is carried out self calibration, and this frame synchronization sequence is saved in the memory, return the reception identifier that an expression frame synchronization sequence finishes receiving to read write line simultaneously.Wherein label to the time span of delimiter and calibration symbol with average as the reference frequency calibration value, can prevent that thus time deviation from occurring, and guarantees that the calibration of reference frequency is very accurate after to the frame synchronization sequence demodulation.
Wherein, after read write line receives and receives identifier, its read-write controller produces the base band order according to the instruction of back bench control system, its codec is encoded to this base band order, by modulator-demodulator 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 again, send by antenna.Wherein frame synchronization sequence is attached to the front of base band order.
Step 304: if receive that described label returns set up identifier synchronously, 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 memory 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 produce a frame synchronization sequence again and send to label, in order to set up synchronous communication with label.Concrete communication process is identical with step 302-304, 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 read-write controller by read write line produces the order that for example produces random number again; 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 identifier synchronously.
Read write line by present embodiment is to the information transferring method of label, realized the self calibration of the reference frequency of label, do not need to increase temperature-compensation circuit, saved the area of label chip, thereby reduced the overall power of chip, guaranteed read write line and label can act in agreement the ground co-ordination.
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 an application example to present embodiment.
Fig. 6 please refer to Fig. 6 for the emulation experiment curve chart of the communication mode of three kinds of different frame synchronizing sequences of employing.
Under white Gaussian noise channel model condition, the improved Manchester coding of Manchester, PIE and the embodiment of the invention is carried out frame synchronization performance emulation, analyze false synchronous probability.In the emulation, each Frame is made up of frame synchronization sequence and information bit, the known format that the frame synchronization sequence form that wherein adopts Manchester and PIE coded data frame to comprise defines for its coding method, the frame synchronization sequence form that the improved Manchester coded data frame of the employing embodiment of the invention comprises is form shown in Figure 4, wherein information bit is made up of after corresponding encoded 32 0,1 sequences that produce at random, averages behind the replicate analysis 1000000 times.When detecting synchronously, frame synchronization sequence is made related operation, think synchronous success greater than threshold value, otherwise take place synchronously false.
Simulation result as shown in Figure 6, the MMC among the figure represents the improved Manchester coding method of the embodiment of the invention.As can be seen from Figure 6, improved Manchester coding adopts the frame synchronization sequence of the embodiment of the invention, and its false synchronous probability obviously is minimum in whole signal to noise ratio scope.
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 use other communication steps to realize that read write line is to the message transmitting procedure of label.Any information transferring method that comprises frame synchronization sequence structure of the present invention all will drop within protection scope of the present invention.
A kind of read write line that Fig. 7 provides for the embodiment of the invention is to the flow chart of the information transferring method of label, and this method is applied to the label of rfid system, please refer to Fig. 7, and this method comprises:
Step 701: when the continuous high level radio-frequency carrier that receives that read write line sends, send identity code to described read write line;
Step 702: receive the frame synchronization sequence that described read write line returns and preserve, wherein, described frame synchronization sequence comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated;
Step 703: obtain the reference frequency calibration value according to described frame synchronization sequence, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration;
Step 704: send to described read write line and to receive identifier, 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 705: 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 identifier synchronously;
Step 706: 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. 3, because in the embodiment shown in fig. 3, 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. 3, introduce read write line to the message transmitting procedure of label, do not introduce label in detail to the transmission course of read write line, this is because can use any known transmission method and coding method to realize that label is to the information transmission of read write line, for example, when label transmitting information is given read write line, be in the consideration of the disposal ability of label self, use simple Miller code method to carry out the information transmission usually.
Read write line by present embodiment is to the information transferring method of label, realized the self calibration of the reference frequency of label, do not need to increase temperature-compensation circuit, saved the area of label chip, thereby reduced the overall power of chip, guaranteed read write line and label can act in agreement the ground co-ordination.
The function composition frame chart of a kind of read write line that Fig. 8 provides for the embodiment of the invention please refer to Fig. 8, and this read write line comprises:
First transmitting element 803 is used for the frame synchronization sequence that described first generation unit 802 produces is sent to described label;
Second transmitting element 806 is used for comprising the frame synchronization sequence of described first generation unit 802 generations and the carrier signal of the base band order behind described coding unit 805 codings sends to described label;
Determining unit 807, 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 first generation unit 802 also is used for: when receiving the timing error identifier that described label returns, again produce a frame synchronization sequence, this frame synchronization sequence that produces again comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; Described first transmitting element 803 also is used for: the frame synchronization sequence that described first generation unit 802 is produced again sends to described label, in order to set up synchronous communication with described label.
In one embodiment, the delimiter that the frame synchronization sequence that described first generation unit 802 produces comprises is the low level of certain hour length, and described time span is determined by the data transfer rate size of described read write line; The calibration symbol that the frame synchronization sequence that described first generation unit 802 produces comprises comprises a high level and a low level, and the time span of each calibration symbol all equates with the time span of delimiter; The binary data 1 that the data message that the frame synchronization sequence that described first generation unit 802 produces comprises comprises the binary data 0 represented with two code elements 10, represent with two code elements 11, the binary system fault data of representing with two continuous high level of unit interval length and the binary data of representing with two code elements 01 1, wherein, the high level pulse of a unit interval length represents that the low level pulse of 1, one unit interval length of code element represents code element 0.
In one embodiment, the continuous high level radio-frequency carrier of the certain-length of described transmitter unit 801 emissions does not comprise data message, and described certain-length is not more than 8 code period.
In one embodiment, the time span of the delimiter that comprises of the frame synchronization sequence that produces of described first generation unit 802 is between 8.25-25us.
In the present embodiment, transmitter unit 801, first transmitting element 803, second transmitting element 806 can be realized by antenna and the modulator-demodulator of read write line; First generation unit 802 can be realized by the frame synchronization sequence generator; Second generation unit 804, determining unit 807 can realize by read-write controller; Coding unit 805 can be realized by codec.Because the structure of this read write line is formed and function is described in earlier figures 2 and Fig. 3, does not repeat them here.
Read write line by present embodiment, realize the self calibration of the reference frequency of label, do not needed to increase temperature-compensation circuit, saved the area of label chip, thereby reduced the overall power of chip, guaranteed read write line and label can act in agreement the ground co-ordination.
The composition frame chart of a kind of label that Fig. 9 provides for the embodiment of the invention please refer to Fig. 9, and this label comprises:
First transmitting element 901 is used for sending identity code to described read write line when the continuous high level radio-frequency carrier that receives that read write line sends;
First receiving element 902, be used for after described read write line sends identity code, receiving the frame synchronization sequence that described read write line returns at described first transmitting element 901, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated;
Second transmitting element 905 is used for sending the reception identifier to described read write line behind described alignment unit 904 self calibrations;
Second receiving element 906 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 after described second transmitting element 905 sends described reception identifier to described read write line;
Comparing unit 907, the frame synchronization sequence of preserving for frame synchronization sequence and the described memory cell 903 of the described carrier signal that described second receiving element 906 is received compares;
The 3rd transmitting element 908, for the comparative result at described comparing unit 907 be, when the frame synchronization sequence that the frame synchronization sequence in the described carrier signal that described second receiving element 906 receives and described memory cell 903 are preserved is identical, sends to described read write line and to set up identifier synchronously;
Decoding unit 909, the base band command decode behind the coding that is used for described second receiving element 906 is received is also carried out described base band order.
In one embodiment, described the 3rd transmitting element 908 also is used at the comparative result of described comparing unit 907, the frame synchronization sequence that frame synchronization sequence in the described carrier signal that described second receiving element 906 receives and described memory cell 903 are preserved sends the timing error identifier to described read write line not simultaneously.
In one embodiment, the reference frequency calibration value that utilizes of described alignment unit 904 is the mean value of the time span sum of delimiter and calibration symbol in the described frame synchronization sequence.
In the present embodiment, first transmitting element 901, first receiving element 902, second transmitting element 905, second receiving element 906, the 3rd transmitting element 908 can be realized by antenna and the modulator-demodulator of label; Memory cell 903 can realize by the memory cell of label; Alignment unit 904, comparing unit 907 can be realized by the recording controller of label; Decoding unit 909 can be realized by the codec of label.Because the structure of this label is formed and function is described in earlier figures 2 and Fig. 3, does not repeat them here.
By the label of present embodiment, realized the self calibration of the reference frequency of label, do not need to increase temperature-compensation circuit, saved the area of label chip, thereby reduced the overall power of chip, guaranteed read write line and label can act in agreement the ground co-ordination.
The composition frame chart of a kind of rfid system that Figure 10 provides for the embodiment of the invention please refer to Figure 10, and this rfid system comprises: read write line 1001 and label 1002, wherein:
Read write line 1001 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, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; When receiving the reception identifier that described label returns, instruction according to the back bench control system produces the base band order, and described base band order encoded, 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;
In the present embodiment, the communication process of read write line 1001 and label 1002 may further comprise the steps:
Step 1: read write line 1001 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 1002 receives the described continuous high level radio-frequency carrier that read write line 1001 sends, therefrom obtain energy and be activated, send an identity code to read write line 1001.
Step 3: after read write line 1001 receives the identity code of label 1002, produce a frame synchronization sequence and it is modulated on the radio-frequency carrier, send to this label 1002 then; The structure of this frame synchronization sequence part has in the above been done detailed introduction, repeats no more here.
Step 4: label 1002 carries out demodulation to it after receiving this frame synchronization sequence, obtain the reference frequency calibration value, according to this value the reference frequency in the label 1002 is carried out self calibration, and this frame synchronization sequence is saved in the memory, return one for simultaneously read write line 1001 and receive identifier.
Step 5: after read write line 1001 receives and receives identifier, encode according to the instruction generation base band order of back bench 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.
Step 6: 1002 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 memory is compared, if two sequences are identical, then label 1002 sends one and sets up identifier synchronously to read write line 1001, between is set up synchronous communication thus, 1002 pairs of these base band orders of label are simultaneously 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 1001.
Step 7: if read write line 1001 receives the timing error identifier, then re-execute described step 3-6 up to having set up synchronous communication.
The read write line 1001 of present embodiment can be realized by read write line shown in Figure 8, the label 1002 of present embodiment can be realized by label shown in Figure 9, since Fig. 8 and embodiment illustrated in fig. 9 in, read write line and label are had been described in detail, do not repeat them here.
Rfid system by present embodiment, realize the self calibration of the reference frequency of label, do not needed to increase temperature-compensation circuit, saved the area of label chip, thereby reduced the overall power of chip, guaranteed read write line and label can act in agreement the ground co-ordination.
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 asccess memory (RAM), internal memory, 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; and be not intended to limit the scope of the 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 (17)
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, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated;
If receive the reception identifier that described label returns, then the instruction according to the back bench control system produces the base band order, and described base band order encoded, 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 produce a frame synchronization sequence again, and the described frame synchronization sequence that produces again sent to described label, in order to set up synchronous communication with described label, wherein, the described frame synchronization sequence that produces again comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated.
3. method according to claim 1 and 2 is characterized in that:
Described delimiter is the low level of certain hour length, and described time span is determined by the data transfer rate size of described read write line;
Described calibration symbol comprises a high level and a low level, and the time span of each calibration symbol all equates with the time span of delimiter;
The binary data 1 that described data message comprises the binary data 0 represented with two code elements 10, represent with two code elements 11, the binary system fault data of representing with two continuous high level of unit interval length and the binary data of representing with two code elements 01 1, wherein, the high level pulse of a unit interval length represents that the low level pulse of 1, one unit interval length of code element represents code element 0.
4. 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.
5. method according to claim 1 is characterized in that, the time span of described delimiter is between 8.25-25us.
6. 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 the continuous high level radio-frequency carrier that receives that read write line sends, send identity code to described read write line;
Receive the frame synchronization sequence that described read write line returns and preserve, wherein, described frame synchronization sequence comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated;
Obtain the reference frequency calibration value according to described frame synchronization sequence, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration;
Send to described read write line and to receive identifier, the carrier signal that comprises the base band order behind frame synchronization sequence and the coding that receives that described read write line returns;
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 identifier synchronously;
To the base band command decode behind the described coding and carry out described base band order.
7. method according to claim 6 is characterized in that:
If described frame synchronization sequence is different with the frame synchronization sequence of preservation, then send the timing error identifier to described read write line.
8. method according to claim 6 is characterized in that, described reference frequency calibration value is delimiter and the mean value of calibrating the time span sum that accords with in the described frame synchronization sequence.
9. 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;
First generation unit, be used for behind the identity code that receives the label transmission, produce a frame synchronization sequence, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated;
First transmitting element is used for the frame synchronization sequence that described first generation unit produces is sent to described label;
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 back bench control system;
Coding unit is used for the base band order that described second generation unit produces is encoded;
Second transmitting element is used for comprising the frame synchronization sequence of described 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.
10. read write line according to claim 9 is characterized in that:
Described first generation unit also is used for: when receiving the timing error identifier that described label returns, again produce a frame synchronization sequence, the described frame synchronization sequence that produces again comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated;
Described first transmitting element also is used for: the frame synchronization sequence that described first generation unit is produced again sends to described label, in order to set up synchronous communication with described label.
11. read write line according to claim 9 is characterized in that, the delimiter that the frame synchronization sequence that described first generation unit produces comprises is the low level of certain hour length, and described time span is determined by the data transfer rate size of described read write line; The calibration symbol that the frame synchronization sequence that described first generation unit produces comprises comprises a high level and a low level, and the time span of each calibration symbol all equates with the time span of delimiter; The binary data 1 that the data message that the frame synchronization sequence that described first generation unit produces comprises comprises the binary data 0 represented with two code elements 10, represent with two code elements 11, the binary system fault data of representing with two continuous high level of unit interval length and the binary data of representing with two code elements 01 1, wherein, the high level pulse of a unit interval length represents that the low level pulse of 1, one unit interval length of code element represents code element 0.
12. read write line according to claim 9 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.
13. read write line according to claim 9 is characterized in that, the time span of the delimiter that the frame synchronization sequence that described first generation unit produces comprises is between 8.25-25us.
14. a label is characterized in that, described label comprises:
First transmitting element is used for sending identity code to described read write line when the continuous high level radio-frequency carrier that receives that read write line sends;
First receiving element, be used for after described read write line sends identity code, receiving the frame synchronization sequence that described read write line returns at described first transmitting element, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated;
Memory cell is used for the frame synchronization sequence that described first receiving element of storage receives;
Alignment unit, the frame synchronization sequence that is used for receiving according to described first receiving element obtains the reference frequency calibration value, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration;
Second transmitting element is used for sending the reception identifier to described read write line behind described alignment unit self calibration;
Second receiving element 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 after described second transmitting element sends described reception identifier to described read write line;
Comparing unit, the frame synchronization sequence of preserving for frame synchronization sequence and the described memory cell of the described carrier signal that described 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 second receiving element receives and described memory cell are preserved is identical, sends to described read write line and to set up identifier synchronously;
Decoding unit, the base band command decode behind the coding that is used for described second receiving element is received is also carried out described base band order.
15. label according to claim 14 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 described carrier signal that described second receiving element receives and described memory cell are preserved sends the timing error identifier to described read write line not simultaneously.
16. label according to claim 14 is characterized in that:
The reference frequency calibration value that described alignment unit utilizes is delimiter and the mean value of calibrating the time span sum that accords with in the described frame synchronization sequence.
17. 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, wherein, described frame synchronization sequence comprises: the delimiter, two of the starting point of an expression frame synchronization sequence is used for calibration symbol and data message that reference frequency is calibrated; When receiving the reception identifier that described label returns, instruction according to the back bench control system produces the base band order, and described base band order encoded, 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 the continuous high level radio-frequency carrier that receives that read write line sends, send identity code to described read write line; Receive the frame synchronization sequence that described read write line returns and preserve, wherein, described frame synchronization sequence comprises: the delimiter of the starting point of an expression frame synchronization sequence, two are used for calibration symbol and data message that reference frequency is calibrated; Obtain the reference frequency calibration value according to described frame synchronization sequence, according to described reference frequency calibration value the reference frequency in the described label is carried out self calibration; Send to described read write line and to receive identifier, 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 identifier synchronously 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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| CN102332083B (en) * | 2011-10-10 | 2014-11-05 | 中国电子技术标准化研究所 | Information transmission methods and devices for radio frequency identification reader and tag |
| CN103187998B (en) * | 2011-12-29 | 2015-08-12 | 国民技术股份有限公司 | Near field communication system and near field communication method |
| CN103218630A (en) * | 2012-01-19 | 2013-07-24 | 黄建炜 | Radio frequency identification sensing system with interactive function and sensing device thereof |
| CN103888388B (en) * | 2012-12-24 | 2017-04-19 | 北京中电华大电子设计有限责任公司 | UHF RFID reader frequency offset estimation and frame synchronization method |
| DE102014219512A1 (en) * | 2014-09-26 | 2016-03-31 | Dr. Johannes Heidenhain Gmbh | Method and device for serial data transmission via a bidirectional data transmission channel |
| DE102017204184A1 (en) * | 2017-03-14 | 2018-09-20 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Authenticated confirmation and activation message |
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