CN106911425A - A kind of method and apparatus of RFID label tag decoding - Google Patents
A kind of method and apparatus of RFID label tag decoding Download PDFInfo
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- CN106911425A CN106911425A CN201511034144.XA CN201511034144A CN106911425A CN 106911425 A CN106911425 A CN 106911425A CN 201511034144 A CN201511034144 A CN 201511034144A CN 106911425 A CN106911425 A CN 106911425A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0043—Realisations of complexity reduction techniques, e.g. use of look-up tables
- H04L1/0044—Realisations of complexity reduction techniques, e.g. use of look-up tables specially adapted for power saving
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
- H04L25/062—Setting decision thresholds using feedforward techniques only
Abstract
The invention discloses a kind of method and apparatus of radio frequency identification (RFID) label decoding, method includes：After the ultra-high frequency signal that read write line sends carries out rectification and demodulation via tag analog front-end circuit, label digital received signals are obtained；The label digital received signals demo_data to obtaining is synchronized, and obtains the digital received signals demo_data_sync after synchronization；Symbol to the digital received signals demo_data_sync after synchronization is counted, and obtains the length gauge numerical value of N 2 of current sign；The comparing of length gauge numerical value of N 2 and leading judgment threshold and decoding threshold value according to the current sign, judges leading and decodes data bit information, with the leading judgement of the collection of letters number that achieves a butt joint and data decoding operate.
Description
Technical field
The present invention relates to radio frequency identification (RFID, Radio Frequency Identification) technical field, more particularly to
A kind of method and apparatus of RFID label tag decoding.
Background technology
As the Internet of Things that thing thing is connected, it is referred to as the third wave of the world information industry development after computer, internet,
With wide application field and huge development prospect, and as the RFID technique of one of Internet of Things core technology, even more exist
Wherein play vital effect；Label completes information Store important with identification as the important carrier of RFID technique
Function.In all types of labels, the range of application of passive ultra-high frequency label is the most wide.
In order to reach farther operating distance, it is necessary to label has lower sensitivity, and lower sensitivity corresponds to tag circuit
On be lower circuit power consumption.Because the carrier signal that the work capacity of passive RFID tags comes to receiving is changed
Arrive, and it is relatively small the carrier energy obtained in decoding process is received, so for label, realizing being correctly decoded
On the basis of, the problem of key is become using suitable decoding process reduction decoding power consumption.Prior art can only be by the solution of label
Code lower power consumption arrive μ w (microwatt) level, it is impossible to meet practical application to decoding power consumption more requirements.
The content of the invention
To solve existing technical problem, the embodiment of the present invention is expected to provide a kind of method and apparatus of RFID label tag decoding.
For achieving the above object, the embodiment of the present invention is realized in the following ways：
A kind of method of radio frequency identification (RFID) labels decoding is the embodiment of the invention provides, methods described includes：
After the ultra-high frequency signal that read write line sends carries out rectification and demodulation via tag analog front-end circuit, label digital received is obtained
Signal；
The label digital received signals demo_data to obtaining is synchronized, and obtains the digital received signals after synchronization
demo_data_sync；
Symbol to the digital received signals demo_data_sync after synchronization is counted, and obtains the length count value of current sign
N2；
The comparing of length gauge numerical value of N 2 according to the current sign and leading judgment threshold and decoding threshold value, judge it is leading simultaneously
Data bit information is decoded, with the leading judgement of the collection of letters number that achieves a butt joint and data decoding operate.
In such scheme, methods described also includes：
According to the comparing of current symbol lengths count value N2 with the leading decision threshold, leading judgement is carried out, if it is determined that
Go out it is leading, then proceed by data decoding；
Data decoding is relatively carried out according to current symbol lengths count value N2 and data decoding threshold value, in normal range (NR)
Data symbol length, decode corresponding data bit information, the data symbol for length outside normal range (NR), decoding
When produce mismark information.
In such scheme, the leading decision threshold includes α and β, and in α≤N2 ＜ β, judgement detection of preamble success judges
Go out leading.
In such scheme, the data decoding threshold value includes α 1, β 1, α 2, β 2, α 3, β 3, α 4 and β 4,
In α 1≤N2 ＜ β 1, judge that decoded data bits information is 00；
In α 2≤N2 ＜ β 2, judge that decoded data bits information is 01；
In α 3≤N2 ＜ β 3, judge that decoded data bits information is 11；
In α 4≤N2 ＜ β 4, judge that decoded data bits information is 10.
In such scheme, in N2 ＜ α 1 or N2 >=β 4, mismark information is produced.
The embodiment of the present invention additionally provides a kind of device of radio frequency identification (RFID) labels decoding, and described device includes：Synchronization unit,
Symbol count unit, threshold computation unit and compare decision unit, wherein,
The synchronization unit, for being synchronized to the label digital received signals demo_data for obtaining, obtains the number after synchronization
Word receives signal demo_data_sync；The label digital received signals demo_data is the ultra-high frequency signal that read write line sends
Obtained after carrying out rectification and demodulation via tag analog front-end circuit；
The symbol count unit, counts for the symbol to the digital received signals demo_data_sync after synchronization, obtains
To the length gauge numerical value of N 2 of current sign；
The threshold computation unit, for calculating leading judgment threshold and decoding threshold value；
It is described to compare decision unit, for the length gauge numerical value of N 2 according to the current sign and leading judgment threshold and decoding threshold
The comparing of value, judges leading and decodes data bit information, with the leading judgement of the collection of letters number that achieves a butt joint and data decoding behaviour
Make.
In such scheme, the decision unit that compares is further used for, according to the current symbol lengths count value N2 with it is preceding
The comparing of decision threshold is led, leading judgement is carried out, if it is judged that it is leading, then proceed by data decoding；
Data decoding is relatively carried out according to current symbol lengths count value N2 and data decoding threshold value, in normal range (NR)
Data symbol length, decode corresponding data bit information, the data symbol for length outside normal range (NR), decoding
When produce mismark information.
In such scheme, the leading decision threshold include α and β, in α≤N2 ＜ β, it is described compare decision unit judgement before
Lead and detect successfully, judge leading.
In such scheme, the data decoding threshold value includes α 1, β 1, α 2, β 2, α 3, β 3, α 4 and β 4,
In α 1≤N2 ＜ β 1, the decision unit that compares judges that decoded data bits information is 00；
In α 2≤N2 ＜ β 2, the decision unit that compares judges that decoded data bits information is 01；
In α 3≤N2 ＜ β 3, the decision unit that compares judges that decoded data bits information is 11；
In α 4≤N2 ＜ β 4, the decision unit that compares judges that decoded data bits information is 10.
In such scheme, in N2 ＜ α 1 or N2 >=β 4, the decision unit that compares produces mismark information.
A kind of method and apparatus of RFID label tag decoding provided in an embodiment of the present invention, for the ultra-high frequency signal that read write line sends,
Rectification is carried out to signal by tag analog front-end circuit, the electric energy for labeling task is obtained, and by analog demodulator, obtained
The digital received signals of label；After by the digital received signals feeding decoding apparatus after demodulation, digital received signals are synchronized,
Symbol count is carried out to the signal after synchronization, leading judgment threshold and data decoding threshold value is obtained by computing, by symbol count value
It is compared with threshold value, judges leading and decode data bit information, so as to the leading judgement sum of the collection of letters number that achieves a butt joint
According to decoding operate.Using the embodiment of the present invention, the lower power consumption that will can be decoded to nw (nanowatt) level.
Brief description of the drawings
The leading schematic diagram of digital received signals that Fig. 1 specifies for agreement in the embodiment of the present invention；
The digital received signals schematic diagram data that Fig. 2 specifies for agreement in the embodiment of the present invention；
Fig. 3 is a kind of method process chart of RFID label tag decoding in the embodiment of the present invention；
Fig. 4 is a kind of apparatus structure schematic diagram of RFID label tag decoding in the embodiment of the present invention；
Fig. 5 be the embodiment of the present invention in compare decision unit a kind of implementation process schematic diagram.
Specific embodiment
The technical solution of the present invention is further elaborated with specific embodiment below in conjunction with the accompanying drawings.
A kind of method of RFID label tag decoding provided in an embodiment of the present invention, including：
The ultra-high frequency signal that read write line sends carries out rectification and demodulation by tag analog front-end circuit to signal, the number of tags for obtaining
After word receives signal demo_data feeding decoding apparatus, synchronized by demo_data, obtain the numeral after synchronization and connect
Collection of letters demo_data_sync is used as decoding operate signal；
Signal demo_data_sync is counted, current symbol lengths count value N2 is obtained；
According to current symbol lengths count value N2 and the comparing of leading decision threshold α and β, leading judgement is carried out, if it is determined that
Go out it is leading, then proceed by data decoding；Wherein, α represents the lower threshold of leading judgement, and β represents the upper limit of leading judgement
Threshold value；
According to current symbol lengths count value N2 and data decoding threshold alpha 1, β 1, α 2, β 2, α 3, β 3, α 4 and
β's 4 relatively carries out data decoding, for the data symbol length in normal range (NR), solves corresponding data bit information 00b、
01b、11bWith 10b(foregoing subscript b represents that 00,01,11,10 is binary data), for length outside normal range (NR)
Data symbol, mismark information sym_err is produced during decoding.Wherein, α 1 is represented for decoded data bits information 00
Lower threshold, β 1 represents the upper limit threshold for decoded data bits information 00, and α 2 is represented for decoded data bits letter
The lower threshold of breath 01, β 2 represents the upper limit threshold for decoded data bits information 01, and α 3 is represented for decoding data ratio
The lower threshold of special information 11, β 3 represents the upper limit threshold for decoded data bits information 11, and α 4 is represented for solving yardage
According to the lower threshold of bit information 10, β 4 represents the upper limit threshold for decoded data bits information 10.
Wherein, leading decision threshold α and β, and data decodings threshold alpha 1, β 1, α 2, β 2, α 3, β 3, the and of α 4
β 4 can suitably be adjusted according to concrete implementation.
A kind of device of RFID label tag decoding provided in an embodiment of the present invention, including：Synchronization unit, symbol count unit, threshold value
Computing unit and compare decision unit；Wherein,
The ultra-high frequency signal that read write line sends carries out rectification and demodulation by tag analog front-end circuit to signal, the number of tags for obtaining
After word receives signal demo_data feeding decoding apparatus, synchronization unit synchronizes the numeral after obtaining synchronization to demo_data
Receive signal demo_data_sync；
Symbol count unit is realized counting the symbol of the digital received signals demo_data_sync after synchronization, obtains current
The length gauge numerical value of N 2 of symbol；
Threshold computation unit calculates leading decision threshold α and β, and data decoding threshold alpha 1, β 1, α 2, β 2, α 3,
β 3, α 4 and β 4；According to different implementations, α, β, α 1, β 1, α 2, β 2, α 3, β 3, α 4 and β
4 can take different values, it is also possible to partly take identical value；
Compare decision unit and judgement is compared with leading decision threshold α and β by the length gauge numerical value of N 2 to current sign, obtain
To the instruction pre_det_ok of detection of preamble success or not；Threshold value is decoded by the length gauge numerical value of N 2 to current sign and data
The relation of α 1, β 1, α 2, β 2, α 3, β 3, α 4 and β 4, the data bit information 00 for being decodedb、01b、11b、
10bOr mismark information sym_err.
Described in detail in conjunction with specific example below.
As shown in figure 1, the leading schematic diagram of digital received signals that Fig. 1 specifies for agreement in the embodiment of the present invention, can from Fig. 1
To find out, lead code is made up of separator, calibration symbol one and calibration symbol two.
As shown in Fig. 2 the digital received signals schematic diagram data that Fig. 2 specifies for agreement in the embodiment of the present invention, can from Fig. 2
To find out, there is an interval for chronomere between two adjacent symbols, be spaced two adjacent-symbols in the embodiment of the present invention
Centre position the border of adjacent-symbol is set to carry out data decoding.
Again as shown in figure 3, Fig. 3 is the process chart decoded to digital received signals in the embodiment of the present invention, main bag
Include following steps：
Step 301, to the ultra-high frequency signal rx_sig from read write line, rectification and demodulation is carried out by tag analog front-end circuit,
Obtain digital received signals demo_data, starting step 302；
Step 302, synchronizes to digital received signals demo_data, obtains the digital received signals after synchronization
Demo_data_sync, starting step 303；
Step 303, the symbol to the digital received signals demo_data_sync after synchronization is counted, and obtains current sign meter
Numerical value of N 2, when each symbol has been received, starting step 304；
Step 304, according to current sign count value N2 and the relation of leading decision threshold α and β, carries out leading judgement, if
Relation is α≤N2 ＜ β, then starting step 305, otherwise continue executing with step 304；
Step 305, judgement detection of preamble succeeds and produces detection of preamble successfully to indicate pre_det_ok, subsequent execution step 306,
308th, 310,312 and 314.
Step 306, if it is α 1≤N2 ＜ β 1, startup step that current sign count value N2 is met with the relation of data decoding threshold value
Rapid 307；
Step 307, judges that decoded bits information is 00b, starting step 316；
Step 308, if it is α 2≤N2 ＜ β 2, startup step that current sign count value N2 is met with the relation of data decoding threshold value
Rapid 309；
Step 309, judges that decoded bits information is 01, starting step 316；
Step 310, if it is α 3≤N2 ＜ β 3, startup step that current sign count value N2 is met with the relation of data decoding threshold value
Rapid 311；
Step 311, judges that decoded bits information is 11, starting step 316；
Step 312, if it is α 4≤N2 ＜ β 4, startup step that current sign count value N2 is met with the relation of data decoding threshold value
Rapid 313；
Step 313, judges that decoded bits information is 10, starting step 316；
Step 314, if it is N2 ＜ α 1 or N2 >=β 4 that current sign count value N2 meets the relation for decoding threshold value with data,
Starting step 315；
Step 315, judges that decoded information is symbol error sym_err, starting step 317.
Step 316, judges whether to go to last symbol, if going to last symbol, starting step 317,
Otherwise continue executing with step 306,308,310,312 and 314.
Step 317, terminates decoding process.
As shown in figure 4, Fig. 4 be the embodiment of the present invention in the processing unit that digital received signals demo_data is decoded is shown
It is intended to, as shown in Fig. 4 401, the device includes synchronization unit 4011, symbol count unit 4012, threshold computation unit
4013 and compare decision unit 4014；Wherein,
Synchronization unit 4011：Data signal demo_data to receiving carries out 2 grades of synchronizations, obtains the letter of the digital received after synchronization
Number demo_data_sync；
Symbol count unit 4012：Symbol to the digital received signals demo_data_sync after synchronization is counted, and is worked as
The length gauge numerical value of N 2 of preceding symbol；
Threshold computation unit 4013：It is calculated leading decision threshold α=12 and β=20, and data decoding threshold alpha 1=8, β
1=α 2=20, β 2=α 3=28, β 3=α 4=36 and β 4=64；
Compare decision unit 4014：By the length gauge numerical value of N 2 to current sign and the relation of leading decision threshold, carry out leading
Judgement, if meeting relation：(α=12)≤N2 ＜ (β=20), then obtain detection of preamble and successfully indicate pre_det_ok；Pass through
Length gauge numerical value of N 2 to current sign decodes the relation of threshold value, the data bit information 00 for being decoded with datab、01b、11b、
10bOr mismark information sym_err, it is as follows：
If (α 1=8)≤N2 ＜ (β 1=20), data bit is 00b；
If (α 2=20)≤N2 ＜ (β 2=28), data bit is 01b；
If (α 3=28)≤N2 ＜ (β 3=36), data bit is 11b；
If (α 4=36)≤N2 ＜ (β 4=64), data bit is 10b；
If N2 ＜ (α 1=8) or N2 >=(β 4=64), mismark sym_err.
For details, reference can be made to a kind of schematic diagram of implementation process of comparing decision unit shown in Fig. 5.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with sheet
Those skilled in the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all cover in this hair
Within bright protection domain.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of method that radio frequency identification (RFID) labels are decoded, it is characterised in that methods described includes：
After the ultra-high frequency signal that read write line sends carries out rectification and demodulation via tag analog front-end circuit, label digital received is obtained
Signal；
The label digital received signals demo_data to obtaining is synchronized, and obtains the digital received signals after synchronization
demo_data_sync；
Symbol to the digital received signals demo_data_sync after synchronization is counted, and obtains the length count value of current sign
N2；
Length gauge numerical value of N 2 and the comparing of leading judgment threshold and decoding threshold value according to the current sign, judge leading and solve
Code goes out data bit information, with the leading judgement of the collection of letters number that achieves a butt joint and data decoding operate.
2. the method that RFID label tag is decoded according to claim 1, it is characterised in that methods described also includes：
According to the comparing of current symbol lengths count value N2 with the leading decision threshold, leading judgement is carried out, if it is judged that
It is leading, then proceed by data decoding；
Data decoding is relatively carried out according to current symbol lengths count value N2 and data decoding threshold value, in normal range (NR)
Data symbol length, decodes corresponding data bit information, the data symbol for length outside normal range (NR), during decoding
Produce mismark information.
3. the method that RFID label tag is decoded according to claim 2, it is characterised in that the leading decision threshold includes α
And β, in α≤N2 ＜ β, judgement detection of preamble success is judged leading.
4. the method that RFID label tag is decoded according to claim 3, it is characterised in that the data decoding threshold value includes α
1st, β 1, α 2, β 2, α 3, β 3, α 4 and β 4,
In α 1≤N2 ＜ β 1, judge that decoded data bits information is 00；
In α 2≤N2 ＜ β 2, judge that decoded data bits information is 01；
In α 3≤N2 ＜ β 3, judge that decoded data bits information is 11；
In α 4≤N2 ＜ β 4, judge that decoded data bits information is 10.
5. the method that RFID label tag is decoded according to claim 4, it is characterised in that in N2 ＜ α 1 or N2 >=β 4,
Produce mismark information.
6. the device that a kind of radio frequency identification (RFID) labels are decoded, it is characterised in that described device includes：Synchronization unit, symbol
Counting unit, threshold computation unit and compare decision unit, wherein,
The synchronization unit, for being synchronized to the label digital received signals demo_data for obtaining, obtains the number after synchronization
Word receives signal demo_data_sync；The label digital received signals demo_data is the ultra-high frequency signal that read write line sends
Obtained after carrying out rectification and demodulation via tag analog front-end circuit；
The symbol count unit, counts for the symbol to the digital received signals demo_data_sync after synchronization, obtains
To the length gauge numerical value of N 2 of current sign；
The threshold computation unit, for calculating leading judgment threshold and decoding threshold value；
It is described to compare decision unit, for the length gauge numerical value of N 2 according to the current sign and leading judgment threshold and decoding threshold value
Comparing, judge leading and decode data bit information, with achieve a butt joint collect mail number leading judgement and data decoding operate.
7. the device of RFID label tag decoding according to claim 6, it is characterised in that described to compare decision unit further
For, according to the comparing of current symbol lengths count value N2 with the leading decision threshold, leading judgement is carried out, if it is determined that
Go out it is leading, then proceed by data decoding；
Data decoding is relatively carried out according to current symbol lengths count value N2 and data decoding threshold value, in normal range (NR)
Data symbol length, decodes corresponding data bit information, the data symbol for length outside normal range (NR), during decoding
Produce mismark information.
8. the device that RFID label tag is decoded according to claim 7, it is characterised in that the leading decision threshold includes α
And β, it is described to compare decision unit judgement detection of preamble success in α≤N2 ＜ β, judge leading.
9. the device that RFID label tag is decoded according to claim 8, it is characterised in that the data decoding threshold value includes α
1st, β 1, α 2, β 2, α 3, β 3, α 4 and β 4,
In α 1≤N2 ＜ β 1, the decision unit that compares judges that decoded data bits information is 00；
In α 2≤N2 ＜ β 2, the decision unit that compares judges that decoded data bits information is 01；
In α 3≤N2 ＜ β 3, the decision unit that compares judges that decoded data bits information is 11；
In α 4≤N2 ＜ β 4, the decision unit that compares judges that decoded data bits information is 10.
10. the device that RFID label tag is decoded according to claim 9, it is characterised in that in N2 ＜ α 1 or N2 >=β 4,
The decision unit that compares produces mismark information.
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