CN105743826A - Miller subcarrier decoding method - Google Patents
Miller subcarrier decoding method Download PDFInfo
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- CN105743826A CN105743826A CN201610308793.2A CN201610308793A CN105743826A CN 105743826 A CN105743826 A CN 105743826A CN 201610308793 A CN201610308793 A CN 201610308793A CN 105743826 A CN105743826 A CN 105743826A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
Abstract
The invention relates to a Miller subcarrier decoding method. The method comprises the steps of: accurately judging a guidance code by judging continuous bits in an echo sequence and recording intervals between the continuous bits; and for the following data extraction, ignoring irrelevant data at two sides of a code element and just judging the middle bit to complete the Miller decoding. The Miller subcarrier decoding method has the advantages that the middle bit offset can be corrected, the decoding success rate is increased, the complexity is reduced, and the anti-interference property and the stability are improved.
Description
[technical field]
The present invention relates to miller code decoding technique field, specifically, be a kind of Miller subcarrier coding/decoding method.
[background technology]
1, RF identification (RFID) is a kind of wireless communication technology, contactlessly can automatically obtain target information, there is signal and penetrate by force, read distance remote, the features such as memory space is big, therefore from 20th century after the nineties is found, RFID technique has been widely used for logistic storage, vehicle management, the various aspects such as fake certification.The REID of current low frequency and application thereof are relatively ripe, super high frequency radio frequency identification technology, i.e. UHFRFID is remote with its identification range, and capacity of resisting disturbance is good and the feature such as multi-tag read-write is increasingly becoming the emphasis developing and studying.
2, RFID system is generally by read write line, antenna, electronic tag and host computer composition.Electronic tag and radio-frequency card, being internally integrated on chip has memory element and data processing unit, it is possible to storage is identified the information of object and realizes data interaction with read write line.Read write line can quickly read and write multiple electronic tag, is generally divided into base band and two parts of radio frequency, is the key equipment of RFID system.Antenna is the device accepting and launching radio wave, and read write line and label are through antenna transceiving radio frequency data mutually.
3, read-write machine baseband processes part needs the echo-signal according to electronic tag correctly to identify useful data, the coded system of label is made stipulations by iso standard 18000-6C and China's standard, could be arranged to FM0 and Miller code mode, Miller code adopts subcarrier form and Miller 2,4,8, the data bit that need to transmit is more, and label echo frequency exists unstability, this just requires that read write line allows for accurately, and echo-signal carries out Miller subcarrier decoding effectively.
4, read write line needs to accurately determine lead code when being decoded, and then solves data according still further to the rule of miller code, the lead code that different agreement specifies difference to some extent.Miller is owing to adopting subcarrier, and its lead code is conciliate the figure place of code data and can be compared many, is easily generated random disturbance when circumstance complication, easily causes error code, loss system performance according to the method judged by turn, and implements the resource that needs are more.
Miller code specifies: saltus step occurs between two adjacent data 0, generation saltus step in the middle of data 1, and the miller code not saltus step between adjacent two 0 after subcarrier modulation, just saltus step between adjacent two 1.
Chinese patent literature CN:103178933A, the patent of invention that date of application is on January 25th, 2013 discloses a kind of subcarrier modulation miller code decoding device and coding/decoding method thereof, its decoding device includes the burst pulse counting module for recording burst pulse number, the input of described burst pulse counting module is connected to broad pulse identification module, and described broad pulse identification module is for identifying the broad pulse in input data；The outfan of described burst pulse counting module is connected to decoder state machine module, and described decoder state machine module is used for determining decoder state machine status information.This coding/decoding method is broad pulse for judging input data, or burst pulse；If burst pulse, the count value of enumerator adds 1；If broad pulse, then export count value, and count value is judged, obtain decoder state machine status information；Judge according to decoder state machine status information, if being initiated with target seeker data, then output decoding data.Starting counting up when finding first broad pulse, during to next broad pulse, this counting terminates, and starts again to count.This inventive technique scheme solves the difficult problem that clock synchronizes, and reduces decoding difficulty and the complexity of decoding device, but its guidance code detection process exists interference, has certain unstability.
In sum, by judging the continuous position in echo sequence, and seeker is accurately judged by recording the interval between continuous position, data afterwards are extracted, ignore code element both sides extraneous data, a kind of Miller subcarrier coding/decoding method only interposition judged, yet there are no open.
[summary of the invention]
It is an object of the invention to for deficiency of the prior art, it is provided that a kind of Miller subcarrier coding/decoding method, be decoded into power to increase, reduce complexity.
For achieving the above object, the present invention adopts the technical scheme that: a kind of Miller subcarrier coding/decoding method, comprises the following steps:
A. start Miller-decoded to enable, begin look for lead code；
B., after accepting 01 a certain number of sequence, search the continuous position in echo sequence, record continuous position it
Between interval, and judge whether this interval meets guidance code rule；
C. the sequence being determined for compliance with rule is guidance code, obtains decoding flag bit；
D. code element interposition and neighbouring adjacent bit information is obtained with reference time point；
E. ignore the independent bit of code-element period both sides, directly interposition is judged, if two, centre is equal,
Being then symbol 1, not waiting is symbol 0, and adjusts the time point of next code element；
F. decoding regulation figure place, verifies.
Judging whether described in step b meets the flow process that realizes of guidance code rule: detect continuous position after individual 01 sequence of n (n≤4M) being detected, and record the interval between continuous position, when interval between four continuous positions and given interval are consistent, think that it is guidance code, and after completing last code-element period, providing decoding Data Labels position, the decoding for Miller subcarrier provides reference time point.
In step e, further, it is contemplated that the uncertainty of disturbance and echo frequency, while the code element interposition obtained in step d judges, adjacent bit near it is also carried out judgement, if adjacent bit there occurs skew, then on the time point of next code-element period, makes corresponding adjustment.
The invention has the advantages that:
The inventive method is by judging the continuous position in echo sequence, and record the interval between continuous position and accurately judge seeker, data afterwards are extracted, ignore code element both sides extraneous data, only interposition is judged, and interposition skew can be corrected, increase and be decoded into power, reduce complexity, improve anti-interference and stability.
[accompanying drawing explanation]
Accompanying drawing 1 is the decoding process schematic of the inventive method.
Accompanying drawing 2 is Miller code state diagram.
Accompanying drawing 3 is Miller sequence of subcarriers.
Accompanying drawing 4 is example guidance code schematic diagram
[detailed description of the invention]
Below in conjunction with accompanying drawing, detailed description of the invention provided by the invention is elaborated.
In Miller code one cycle of requirement, level does not change is 1, and it is 0 that upset occurs, and comments between two symbols and must overturn.
The coefficient that embodiment of the present invention Miller subcarrier is selected is M=2, M=4 and M=8.By accompanying drawing 2 Miller code state diagram it can be seen that within a cycle, having continuous two is 0 or 1 expression symbol 1, it does not have position then represents 0 continuously.But this rule is on the border in two cycles and inapplicable, the present invention determines the time point of code-element period when decoding according to seeker, then according to judging data with or without continuous position.
When circumstance complication, the echo-signal of label is likely to occur the disturbance of random burst, data are made to be no longer complies with the rule of Miller, the Miller-decoded method of the present invention: determining on the basis of code-element period time point, ignore the independent bit of code-element period both sides, directly interposition is judged, if two, centre is equal, it is then symbol 1, does not wait as symbol 0.Further, it is contemplated that the uncertainty of disturbance and echo frequency, neighbouring phase vicinal is also carried out judgement, if position there occurs skew continuously, then on the time point of next code-element period, has made corresponding adjustment, greatly enhance anti-interference and stability.
Lead code is that decoding provides synchronised clock and time origin, decoding is most important, Miller sequence of subcarriers as shown in Figure 3: for the Miller subcarrier of M=2, owing to figure place is not as many, can effectively realize with the sequence detecting method of step-by-step, but for M=4, the lead code that M=8 is long, sequence detecting method seems more complicated, and especially the judgement of interposition return state is relatively cumbersome, is unfavorable for realizing.
As shown in Figure 1, one Miller subcarrier coding/decoding method of the present invention comprises the following steps:
A. start Miller-decoded to enable, begin look for lead code；
B., after accepting 01 a certain number of sequence, search the continuous position in echo sequence, record the interval between continuous position, and judge whether this interval meets guidance code rule；
C. the sequence being determined for compliance with rule is guidance code, obtains decoding flag bit；
D. code element interposition and neighbouring adjacent bit information is obtained with reference time point；
E. ignoring the independent bit of code-element period both sides, directly interposition is judged, if two, centre is equal, be then symbol 1, not waiting is symbol 0, and adjusts the time point of next code element；
F. decoding regulation figure place, verifies.
Guidance code described in step b is as shown in Figure 4, for specific guidance code, guidance code sequence is 01 a certain number of sequence and 00111101 sequence of Miller subcarrier coding, and in its sequence, the relative position of continuous position is constant, and namely the interval between continuous position is certain, in the example of this explanation, guidance code sequence has 4 continuous positions, interval between when M=2 respectively (2,1,1,1,3) individual Tpri, during M=4 and M=8 in like manner.According to this characteristic, judging whether described in step b of the present invention meets the flow process that realizes of guidance code rule: detect continuous position after 01 individual sequence of n (n≤4M) being detected, and record the interval between continuous position, when interval between four continuous positions and given interval are consistent, think that it is guidance code, and after completing last code-element period, providing decoding Data Labels position, the decoding for Miller subcarrier provides reference time point.
In step e, further, it is contemplated that the uncertainty of disturbance and echo frequency, while the code element interposition obtained in step d judges, adjacent bit near it is also carried out judgement, if adjacent bit there occurs skew, then on the time point of next code-element period, makes corresponding adjustment.Do so, greatly enhances anti-interference and stability.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the inventive method; can also making some improvement and supplement, these improve and supplement and also should be regarded as protection scope of the present invention.
Claims (3)
1. a Miller subcarrier coding/decoding method, it is characterised in that comprise the following steps:
A. start Miller-decoded to enable, begin look for lead code；
B., after accepting 01 a certain number of sequence, search the continuous position in echo sequence, record the interval between continuous position, and judge whether this interval meets guidance code rule；
C. the sequence being determined for compliance with rule is guidance code, obtains decoding flag bit；
D. code element interposition and neighbouring adjacent bit information is obtained with reference time point；
E. ignoring the independent bit of code-element period both sides, directly interposition is judged, if two, centre is equal, be then symbol 1, not waiting is symbol 0, and adjusts the time point of next code element；
F. decoding regulation figure place, verifies.
2. a kind of Miller subcarrier coding/decoding method according to claim 1, it is characterized in that, judging whether described in step b meets the flow process that realizes of guidance code rule: detect continuous position after individual 01 sequence of n (n≤4M) being detected, and record the interval between continuous position, when interval between four continuous positions and given interval are consistent, think that it is guidance code, and after completing last code-element period, providing decoding Data Labels position, the decoding for Miller subcarrier provides reference time point.
3. a kind of Miller subcarrier coding/decoding method according to claim 1, it is characterized in that, in step e, further, considering the uncertainty of disturbance and echo frequency, adjacent bit near it has been also carried out judgement while judging by the code element interposition obtained in step d, if adjacent bit there occurs skew, then on the time point of next code-element period, make corresponding adjustment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108964868A (en) * | 2018-04-28 | 2018-12-07 | 昆明联诚科技股份有限公司 | A kind of ultrahigh frequency radio frequency identification (RFID) reader Miller subcarrier coding/decoding method based on FPGA |
| CN109688080A (en) * | 2017-10-18 | 2019-04-26 | 华大半导体有限公司 | The coding/decoding method and RFID reader of Miller coding |
| CN114244757A (en) * | 2021-12-17 | 2022-03-25 | 中国西安卫星测控中心 | Method for rapidly analyzing bit stream protocol data |
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| CN101620663A (en) * | 2008-07-02 | 2010-01-06 | 中兴通讯股份有限公司 | Data transmitting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109688080A (en) * | 2017-10-18 | 2019-04-26 | 华大半导体有限公司 | The coding/decoding method and RFID reader of Miller coding |
| CN109688080B (en) * | 2017-10-18 | 2021-06-29 | 华大恒芯科技有限公司 | Decoding method of Miller code and RFID reader |
| CN108964868A (en) * | 2018-04-28 | 2018-12-07 | 昆明联诚科技股份有限公司 | A kind of ultrahigh frequency radio frequency identification (RFID) reader Miller subcarrier coding/decoding method based on FPGA |
| CN108964868B (en) * | 2018-04-28 | 2020-08-18 | 昆明联诚科技股份有限公司 | FPGA-based ultrahigh frequency RFID reader-writer Miller subcarrier decoding method |
| CN114244757A (en) * | 2021-12-17 | 2022-03-25 | 中国西安卫星测控中心 | Method for rapidly analyzing bit stream protocol data |
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Inventor after: Zhang Yiyuan Inventor after: Liu Chunjiang Inventor after: Han Dongsheng Inventor after: Zhang Zhenming Inventor before: Liu Chunjiang Inventor before: Han Dongsheng Inventor before: Zhang Zhenming Inventor before: Zhang Yiyuan |