CN111597834B - PIE decoding method only for judging high level - Google Patents
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Abstract
The invention discloses a PIE decoding method for judging only high level, which is characterized by comprising the following steps: (1) defining the encoded signals data-0 and data-1; (2) Judging coding parametersAnd (3) withA relationship between; (3) Judging the ratio relation between the high levels of all the coded signals; (4) Using only high level pairs r=>T Preamble、R＝>And detecting and calculating the T Frame-Sync, and completing decoding based on a formula obtained by calculation. The invention effectively reduces the digital power consumption in the low level period (without carrier), effectively reduces the capacity of the capacitor, and then can reduce the chip area, thereby having great significance for the design of the low-cost tag chip.
Description
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a PIE decoding method for judging only high level.
Background
Radio Frequency Identification (RFID) technology has been rapidly developed in recent years at home and abroad as an emerging automatic identification technology. At present, RFID products developed in China are generally based on medium and low frequency, such as second-generation identity cards, ticket management and the like. Products independently developed in ultra-high frequency bands are fewer, and huge market demands and intense international competition are difficult to adapt. The ultra-high frequency (UHF) tag refers to an RFID tag with the working frequency of 860-960 MHz, has the advantages of long readable and writable distance, high reading speed, wide application range and the like, and can be widely applied to the fields of logistics management, storage, entrance guard and the like.
At present, the country is pushing the application of the internet of things, but the internet of things itself comprises four layers, namely an application layer, a supporting layer, a transmission layer and a sensing layer, and the radio frequency identification is an important member of the sensing layer and is a foundation stone technology in the application of the internet of things.
Radio frequency identification systems are typically composed of a Reader and a radio frequency tag (RFIDTag). The radio frequency tag attached to the object to be identified is stored with electronic data in a contracted format as the identification information of the object to be identified. The reader-writer can read out the electronic data stored in the tag or write information into the tag in a contactless manner, so that automatic identification and management of various objects are realized.
Based on the research 18000-6c protocol, the working flow of the card reader and the tag is analyzed in detail, the ultrahigh frequency tag is passive, the energy of the ultrahigh frequency tag is derived from the radio frequency carrier signal emitted by the card reader, but the radio frequency carrier signal is not generated during the low pulse of PIE coding, and if the tag still performs decoding operation at the moment, a very large capacitor for storing energy is needed, so that the area of the chip can be tagged. The study herein aims to reduce the capacitance and thus the area of the tag chip.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides a PIE decoding method for judging only high level.
The technical scheme adopted by the invention is as follows:
a PIE decoding method for judging only high level is characterized by comprising the following steps:
(1) Defining the coding signals data-0 and data-1;
(2) Judging coding parametersAnd->A relationship between;
(3) Judging the ratio relation between the high levels of all the coded signals;
(4) And detecting and calculating R= > T Preamble and R= > T Frame-Sync only by using a high level, and completing decoding based on a formula obtained by calculation.
Further, the PIE decoding method only judging the high level is characterized in that the constraint relation between data-0 and data-1 in the step (1) is as follows:
data-0＝Tari (1.1)
data-1∈[1.5,2]×Tari (1.2)
x∈[0.5,1]×Tari (1.3)
data-1＝data-0+x (1.4)
x1+PW＝x。 (1.5)
further, the above-mentioned PIE decoding method only for judging high level is characterized in that the step (2) specifically includes:
1) First analyzing the relation between PW and Tari
Minimum PW of PW signal is defined in 18000-6c protocol min MAX (0.265×tari, 2), maximum PW max ＝0.525×Tari；
Order thea∈[0.265,0.525]The method comprises the steps of carrying out a first treatment on the surface of the (2.1) let->B=1-a, then b e [0.475,0.735 ]]；
(2.2)
2) Reanalytical analysisRelationship with b
From the formulae (1.1) to (1.5), the formulae (2.1) and (2.2)
x1∈[0,0.735]×Tari (2.3)
Order theThen there is
x2＝x3-1+b (2.5)
In addition, x and b should have the constraint of formula (2.6) according to the definition of the signal
Further, the PIE decoding method for judging only the high level is characterized in that the ratio relation between the high levels of each signal is analyzed in the step (3), specifically:
1) First judging the ratio relation between RTcal and high level of data-0 signal
Order theWherein RTcal_ H, data-0_H is the high level of the RTcal, data-0 signals, respectively; according to the definition of RTcal signal, there are
RTcal＝2×Tari+x1+PW (3.2)
Thus there is
RTcal_H＝2×Tari+x1 (3.3)
In addition, there are definitions of data-0 signals
data-0_H＝Tari-PW (3.4)
Is of the formula (2.1) and b=1-a
data-0_H＝b×Tari (3.5)
From (3.1), (3.3), (3.5)
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y1 is y1 epsilon [3.04,5.21];
2) Judging the ratio relation between the high level of the data-1 and data-0 signals
Order the
Wherein data-1_H is the high level of the data-1 signal;
according to the definition of the data-1 signal, there are
data-1_H＝Tari+x1 (3.10)
From the formulae (3.9), (3.10) and (3.5)
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y2 is y2 epsilon [1.68,3.10];
3) Judgment T4 min And the high level of the data-1 signal
T4 according to protocol definition min =2×rtcal, i.e. T4 min ＝2×[2×Tari+x1+PW]Is represented by the formula (2.1) and b=1-a
T4 min ＝(6-2×b)×Tari+2×x1 (3.14)
Order the
Then the first time period of the first time period,
when b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y3 is y3 epsilon [3.46,5.05];
4) Judgment T4 min Ratio relationship between (T4 min) and high level of data-0 signal
Order the
Then the first time period of the first time period,
when b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y4 is y4 epsilon [6.80,12.63];
5) Finally, judging the ratio relation between the high levels of TRcal and RTcal signals to enable TRcal=beta multiplied by RTcal, wherein beta epsilon [1.1,3] is defined according to a protocol;
order theWhere TRcal_H is the high level of the TRcal signal, there is
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y5 is y 5E [1.10,3.53].
Further, the above-mentioned PIE decoding method only for judging high level is characterized in that the step (4) specifically includes:
1) For judging r= > T Preamble and r= > T Frame-Sync using only signal high level, there are two problems:
(a) For R= > T Preamble, the only signal sequence similar to the R= > T Preamble is "data-0- > data-1- > T4", and as can be seen from the result of signal analysis, the value intervals of y3 and y5 overlap, so that R= > T Preamble cannot be uniquely determined;
(b) For R= > T Frame-Sync, the signal sequences similar to the R= > T Frame-Sync are "data-0- > data-1", "data-1- > T4" and "RTcal- > TRcal", and as can be seen from the result of signal analysis, the value intervals of y1, y2, y3 and y5 overlap, so that R= > T Frame-Sync cannot be uniquely determined;
(c) Considering the working process of the card reader and the tag, any tag starts from a select+query command or a Query command, otherwise, the tag does not undergo state transition, which is equivalent to no tag working, and the protocol prescribes that parameters cannot be changed in one inventory period, so that it is reasonable to first search the select+query command or the Query command, and analyze the required parameters from the Query command, and the parameters are used for subsequent decoding; select commands, query commands, and other commands are shown; in addition, according to the protocol, R= > T Preamble is only used in Query commands, while R= > T Frame-Sync is used in all commands;
(d) Observing the signal sequence 'data-0- & gt RTcal- & gt TRcal- & gt data-1' in the Query command, wherein the signal sequence which is only similar to the signal sequence is 'data-0- & gt data-1- & gt T4- & gt data-0', and according to the ratio relation of y1, y2, y3, y4 and y5, the signal sequence can be easily distinguished when only high level is used, so that the signal sequence has uniqueness; likewise, the signal sequence "data-0→RTcal→data-1" in the Select command also has uniqueness; in addition, according to the characteristics of R= > T Preamble and R= > T Frame-Sync, R= > T Preamble and R= > T Frame-Sync can be easily distinguished;
(e) d1, d2, d3 and d4 are count values of 4 continuous high-level signals respectively, so that the Query command can be determined to uniquely satisfy the relation (4.1), and the Select command uniquely satisfies the relation (4.2):
from steps (1), (2) and (3), the relation of the relevant parameters can be obtained
Then has
Thereby, decoding is completed.
The invention has the advantages that:
the method effectively reduces the digital power consumption in the low-level period (without carrier), effectively reduces the capacity of the capacitor, can reduce the chip area, and has great significance for the design of the low-cost tag chip.
Drawings
FIG. 1 is a schematic diagram of definition of signals data-0 and data-1.
Fig. 2 is a signal diagram of r= > T Preamble and r= > T Frame-Sync.
FIG. 3 is a schematic diagram of Select command operation.
FIG. 4 is a schematic diagram of the operation of a Query command.
FIG. 5 is a schematic diagram of other command operations.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Examples
A PIE decoding method for judging only high level is characterized by comprising the following steps:
(1) Defining the coding signals data-0 and data-1;
as shown in FIG. 1, the constraint relationship of data-0 and data-1 is:
data-0＝Tari (1.1)
data-1∈[1.5,2]×Tari (1.2)
x∈[0.5,1]×Tari (1.3)
data-1＝data-0+x (1.4)
x1+PW＝x。 (1.5)
(2) Judging coding parametersAnd->A relationship between; the method comprises the following steps:
1) First analyzing the relation between PW and Tari
Minimum PW of PW signal is defined in 18000-6c protocol min MAX (0.265×tari, 2), maximum PW max ＝0.525×Tari；
Order thea∈[0.265,0.525]； (2.1)
Order theB=1-a, then b e [0.475,0.735 ]]；
(2.2)
2) Reanalytical analysisRelationship with b
From the formulae (1.1) to (1.5), the formulae (2.1) and (2.2)
x1∈[0,0.735]×Tari(2.3)
Order theThen there is
x2＝x3-1+b (2.5)
In addition, x and b should have the constraint of formula (2.6) according to the definition of the signal
(3) Judging the ratio relation between the high levels of all the coded signals; the method comprises the following steps:
1) First judging the ratio relation between RTcal and high level of data-0 signal
Order theWherein RTcal_ H, data-0_H is the high level of the RTcal, data-0 signals, respectively; according to the definition of RTcal signal, there are
RTcal＝2×Tari+x1+PW (3.2)
Thus there is
RTcal_H＝2×Tari+x1 (3.3)
In addition, there are definitions of data-0 signals
data-0_H＝Tari-PW (3.4)
Is of the formula (2.1) and b=1-a
data-0_H =b×tari (3.5) is obtainable from (3.1), (3.3), (3.5)
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y1 is y1 epsilon [3.04,5.21];
2) Judging the ratio relation between the high level of the data-1 and the data-0 signals
Wherein data-1_H is the high level of the data-1 signal;
according to the definition of the data-1 signal, there are
data-1_H＝Tari+x1 (3.10)
From the formulae (3.9), (3.10) and (3.5)
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y2 is y2 epsilon [1.68,3.10];
3) Judgment T4 min And the high level of the data-1 signal
T4 according to protocol definition min =2×rtcal, i.e. T4 min ＝2×[2×Tari+x1+PW]Is represented by the formula (2.1) and b=1-a
T4 min ＝(6-2×b)×Tari+2×x1 (3.14)
Order the
Then the first time period of the first time period,
when b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y3 is y3 epsilon [3.46,5.05];
4) Judgment T4 min Ratio relationship between (T4 min) and high level of data-0 signal
Order theThen the first time period of the first time period,
when b is E [0.475,0.5]]At the time, there are
When b is E [0.5,0.735], there are
So the value range of y4 is y4 epsilon [6.80,12.63];
5) Finally, judging the ratio relation between the high levels of TRcal and RTcal signals to enable TRcal=beta multiplied by RTcal, wherein beta epsilon [1.1,3] is defined according to a protocol;
order theWhere TRcal_H is the high level of the TRcal signal, there is
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y5 is y 5E [1.10,3.53].
(4) As shown in fig. 2, only using high level to detect and calculate r= > T Preamble, r= > T Frame-Sync, and completing decoding based on the calculation formula; the method comprises the following steps:
1) For judging r= > T Preamble and r= > T Frame-Sync using only signal high level, there are two problems:
(a) For R= > T Preamble, the only signal sequence similar to the R= > T Preamble is "data-0- > data-1- > T4", and as can be seen from the result of signal analysis, the value intervals of y3 and y5 overlap, so that R= > T Preamble cannot be uniquely determined;
(b) For R= > T Frame-Sync, the signal sequences similar to the R= > T Frame-Sync are "data-0- > data-1", "data-1- > T4" and "RTcal- > TRcal", and as can be seen from the result of signal analysis, the value intervals of y1, y2, y3 and y5 overlap, so that R= > T Frame-Sync cannot be uniquely determined;
(c) As shown in fig. 3, 4 and 5, considering the working process of the card reader and the tag, any tag starts from a select+query command or a Query command, otherwise, the tag will not undergo state transition, which is equivalent to the tag not working, and the protocol specifies that the parameter cannot be changed in one inventory period, so it is reasonable to first search the select+query command or the Query command, and parse the required parameter from the Query command, and the subsequent decoding uses the parameter; select commands, query commands, and other commands are shown; in addition, according to the protocol, R= > T Preamble is only used in Query commands, while R= > T Frame-Sync is used in all commands;
(d) Observing the signal sequence 'data-0- & gt RTcal- & gt TRcal- & gt data-1' in the Query command, wherein the signal sequence which is only similar to the signal sequence is 'data-0- & gt data-1- & gt T4- & gt data-0', and according to the ratio relation of y1, y2, y3, y4 and y5, the signal sequence can be easily distinguished when only high level is used, so that the signal sequence has uniqueness; likewise, the signal sequence "data-0→RTcal→data-1" in the Select command also has uniqueness; in addition, according to the characteristics of R= > T Preamble and R= > T Frame-Sync, R= > T Preamble and R= > T Frame-Sync can be easily distinguished;
(e) d1, d2, d3 and d4 are count values of 4 continuous high-level signals respectively, so that the Query command can be determined to uniquely satisfy the relation (4.1), and the Select command uniquely satisfies the relation (4.2):
from steps (1), (2) and (3), the relation of the relevant parameters can be obtained
Then has
Thereby, decoding is completed.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (4)
1. A PIE decoding method for judging only high level is characterized by comprising the following steps:
(1) Defining the coding signals data-0 and data-1;
(2) Judging coding parametersAnd->A relationship between;
(3) Judging the ratio relation between the high levels of all the coded signals;
(4) Detecting and calculating R= > T Preamble and R= > T Frame-Sync only by using high level, and completing decoding based on a formula obtained by calculation;
the step (4) is specifically as follows:
1) For judging r= > T Preamble and r= > TFrame-Sync using only signal high level, there are two problems:
(a) For R= > T Preamble, the only signal sequence close to it is
As can be seen from the result of signal analysis, the value intervals of y3 and y5 overlap, so that R= > T Preamble cannot be uniquely determined;
(b) For R= > T Frame-Sync, the signal sequence close to this is
The values of y1, y2, y3 and y5 are overlapped as can be seen from the result of signal analysis, so that R= > T Frame-Sync cannot be uniquely determined;
(c) Considering the working process of the card reader and the tag, any tag starts from a select+query command or a Query command, otherwise, the tag does not undergo state transition, which is equivalent to no tag working, and the protocol prescribes that parameters cannot be changed in one inventory period, so that it is reasonable to first search the select+query command or the Query command, and analyze the required parameters from the Query command, and the parameters are used for subsequent decoding; in addition, according to the protocol, R= > T Preamble is only used in Query commands, while R= > T Frame-Sync is used in all commands;
(d) Observing the signal sequence 'data-0- & gt RTcal- & gt TRcal- & gt data-1' in the Query command, wherein the signal sequence which is only similar to the signal sequence is 'data-0- & gt data-1- & gt T4- & gt data-0', and according to the ratio relation of y1, y2, y3, y4 and y5, the signal sequence can be easily distinguished when only high level is used, so that the signal sequence has uniqueness; likewise, the signal sequence "data-0→RTcal→data-1" in the Select command also has uniqueness; in addition, according to the characteristics of R= > T Preamble and R= > T Frame-Sync, R= > T Preamble and R= > T Frame-Sync can be easily distinguished;
(e) d1, d2, d3 and d4 are count values of 4 continuous high-level signals respectively, so that the Query command can be determined to uniquely satisfy the relation (4.1), and the Select command uniquely satisfies the relation (4.2):
from steps (1), (2) and (3), the relation of the relevant parameters can be obtained
Then has
Thereby, decoding is completed.
2. The method of decoding a PIE with only high level judgment according to claim 1, wherein the constraint relation between data-0 and data-1 in the step (1) is:
data-0＝Tari (1.1)
data-1∈[1.5,2]×Tari (1.2)
x∈[0.5,1]×Tari (1.3)
data-1＝data-0+x (1.4)
x1+PW＝x (1.5)。
3. the PIE decoding method of claim 2, wherein the step (2) is specifically:
1) First analyzing the relation between PW and Tari
Minimum PW of PW signal is defined in 18000-6c protocol min MAX (0.265×tari, 2), maximum PW max ＝0.525×Tari；
Order the
Order theB=1-a, then b e [0.475,0.735 ]]； (2.2)
2) Reanalytical analysisRelationship with b
From the formulae (1.1) to (1.5), the formulae (2.1) and (2.2)
x1∈[0,0.735]×Tari (2.3)
Order theThen there is
x2＝x3-1+b(2.5)
In addition, x and b should have the constraint of formula (2.6) according to the definition of the signal
4. A PIE decoding method according to claim 3, wherein the step (3) of analyzing the ratio relationship between the high levels of the signals is specifically as follows:
1) First judging the ratio relation between RTcal and high level of data-0 signal
Wherein RTcal_ H, data-0_H is the high level of the RTcal, data-0 signals, respectively;
according to the definition of RTcal signal, there are
RTcal＝2×Tari+x1+PW(3.2)
Thus there is
RTcal_H＝2×Tari+x1(3.3)
In addition, there are definitions of data-0 signals
data-0_H＝Tari-PW(3.4)
Is of the formula (2.1) and b=1-a
data-0_H＝b×Tari(3.5)
From (3.1), (3.3), (3.5)
When b is E [0.475,0.5], there are
When b is E [0.5,0.735], there are
So the value range of y1 is y1 epsilon [3.04,5.21];
2) Judging the ratio relation between the high level of the data-1 and data-0 signals
Order the
Wherein data-1_H is the high level of the data-1 signal;
according to the definition of the data-1 signal, there are
data-1_H＝Tari+x1 (3.10)
From the formulae (3.9), (3.10) and (3.5)
When b is E [0.5,0.735], there are
So the value range of y2 is y2 epsilon [1.68,3.10];
3) Judgment T4 min And the high level of the data-1 signal
T4 according to protocol definition min =2×rtcal, i.e. T4 min ＝2×[2×Tari+x1+PW]Is represented by the formula (2.1) and b=1-a
T4 min ＝(6-2×b)×Tari+2×x1 (3.14)
Order the
Then the first time period of the first time period,
when b is E [0.5,0.735], there are
So the value range of y3 is y3 epsilon [3.46,5.05];
4) Judgment T4 min And a high level of a data-0 signalRatio relation between
Order the
Then the first time period of the first time period,
when b is E [0.5,0.735], there are
So the value range of y4 is y4 epsilon [6.80,12.63];
5) Finally, judging the ratio relation between the high levels of TRcal and RTcal signals
Let TRcal = β×rtcal, then there is β e [1.1,3] according to the protocol specification;
order theWhere TRcal_H is the high level of the TRcal signal, there is
When b is E [0.5,0.735], there are
So the value range of y5 is y 5E [1.10,3.53].
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