CN103178933A - Subcarrier modulation miller code decoding device and method - Google Patents
Subcarrier modulation miller code decoding device and method Download PDFInfo
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- CN103178933A CN103178933A CN2013100282431A CN201310028243A CN103178933A CN 103178933 A CN103178933 A CN 103178933A CN 2013100282431 A CN2013100282431 A CN 2013100282431A CN 201310028243 A CN201310028243 A CN 201310028243A CN 103178933 A CN103178933 A CN 103178933A
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Abstract
The invention belongs to the technical field of miller code decoding and discloses subcarrier modulation miller code decoding device and method. The decoding device comprises a narrow pulse counting module used for recording the number of narrow pulses. An input end of the narrow pulse counting module is connected with a broad pulse recognition module. The broad pulse recognition module is used for recognizing broad pulses in input data. An output end of the narrow pulse counting module is connected with a decoding state machine module which is used for determining states of a decoding state machine. The problem that clock synchronization is difficult is solved, and decoding difficulty and decoding device complexity are lowered.
Description
Technical field
The invention belongs to Miller code decoding technique field, more specifically, relate to a kind of sub-carrier modulation Miller code decoding device and coding/decoding method thereof.
Background technology
UHF RFID microwave radio recognition technology be in the world state-of-the-art the 4th generation automatic identification technology, just to have begun in recent years the new technology of rising and obtaining applying rapidly, it has the characteristics such as identification Ju Liyuan recognition accuracy is high, the characteristics such as recognition speed is fast, antijamming capability is strong, long service life, penetrable nonmetallic materials, and the utilization scope is wide.
The microwave radio key equipment of identification automatically mainly contains three parts such as radio-frequency identification card, read write line, microwave antenna.Radio-frequency identification card, claim again electronic tag to be mainly used to store identified thing data message, the core of radio-frequency identification card is the integrated circuit with information transmit-receive and memory function, be identified on object because it uses time image common label equally to be secured at, thus this device be called by visualization ground " electronic tag ".Read write line, for the data that read or write radio-frequency identification card, a plurality of object or person persons that it has satisfied rapid movement carry out simultaneously the quick and precisely needs of automatic identification.Microwave antenna, it is connected with read write line, is mainly to the relevant data-signal of radio-frequency identification card sending and receiving.
Along with the application increase of RFID technology, and the deterioration of space electromagnetic environment, read write line more and more disturbs with the existence of communicating by letter between label.The Miller-decoded of having stipulated sub-carrier modulation in the EPC of uhf band C1G2 agreement is due to its strong interference immunity, the first-selection that should communicate by letter with read write line as label.
Miller code regulation: between two adjacent data 0, saltus step occurs, saltus step occurs in the middle of data 1, and the not saltus step between adjacent two 0 of the Miller code after sub-carrier modulation, between adjacent two 1, the ability saltus step is as shown in Figure 1.Only rely on saltus step edge judgement 0,1 data decode implementation method is not enough to reply, and because label echo exists certain uncertainty and unsteadiness, it is carried out also difficulty comparatively of clock synchronous, and increased the complexity of coding/decoding method difficulty and decoding device.
Summary of the invention
For making up defects, the present invention proposes a kind of sub-carrier modulation Miller code decoding device and coding/decoding method thereof, and technical solution of the present invention has solved the difficult problem of clock synchronous, has reduced the complexity of decoding difficulty and decoding device.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions.
Technical scheme one:
A kind of sub-carrier modulation Miller code decoding device, it is characterized in that, comprise that the input of described burst pulse counting module is connected with the broad pulse identification module be used to the burst pulse counting module that records the burst pulse number, described broad pulse identification module is used for the broad pulse of identification input data; The output of described burst pulse counting module is connected with the decoder state machine module, and described decoder state machine module is used for determining the decoder state machine state information.
The characteristics of technique scheme and further the improvement are:
(1) input of described decoder state machine module is connected with the condition processing module, and described condition processing module is used for arranging the decode condition of described decoder state machine module.
(2) output of described decoder state machine module is connected with the decoding output module, and described decoding output module is used for the output decoded data.
Technical scheme two:
A kind of sub-carrier modulation Miller code coding/decoding method is characterized in that, judgement input data are broad pulses, or burst pulse;
If burst pulse, the count value of counter adds 1;
If broad pulse is exported count value, and count value is judged, obtain the decoder state machine state information;
Judge according to the decoder state machine state information, if be initiated with the target seeker data, export decoded data.
The characteristics of technique scheme and further the improvement are:
(1) begin counting when finding first broad pulse, during to next broad pulse, this counting finishes, and begins counting again.
(2) described target seeker data comprise 4 code-element period data 0 and data 010111.
(3) described target seeker data comprise 8 code-element period data 0 and data 010111.
(4) whether finish according to separating code length judgement decoding.
Technical solution of the present invention according to Miller subcarrier target seeker coding rule, is utilized the Miller code of sub-carrier modulation, carries out sorting-out in statistics by the cumulative number of the burst pulse between broad pulse and goes out the decoder state machine initial bit.Technical solution of the present invention can judge the judgement position of label echo quickly and accurately, has solved the difficult problem of clock synchronous, has reduced the complexity of decoding difficulty and decoding device.
Description of drawings
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail.
Fig. 1 is embodiment of the present invention sub-carrier modulation Miller code decoding device schematic diagram;
Fig. 2 is embodiment of the present invention Miller code target seeker (TRext=0) sequence schematic diagram;
Fig. 3 is embodiment of the present invention Miller code target seeker (TRext=1) sequence schematic diagram;
Fig. 4 is embodiment of the present invention sub-carrier modulation Miller code sequence schematic diagram;
Fig. 5 is the state information list of decoder state machine in the embodiment of the present invention;
Fig. 6 is instantiation diagram in the state information of decoder state machine of Fig. 5;
Fig. 7 is embodiment of the present invention sub-carrier modulation Miller code coding/decoding method schematic diagram.
Embodiment
Shown in accompanying drawing 1, embodiment of the present invention sub-carrier modulation Miller code decoding device comprises be used to the burst pulse counting module 102 that records the burst pulse number, the input of burst pulse counting module 102 is connected with broad pulse identification module 101, and broad pulse identification module 101 is used for the broad pulse of identification input data; The output of burst pulse counting module 102 is connected with decoder state machine module 104, and decoder state machine module 104 is used for determining the decoder state machine state information.
The input of decoder state machine module 104 is connected with condition processing module 103, and condition processing module 103 is used for arranging the decode condition of decoder state machine module 104; The output of decoder state machine module 104 is connected with decoding output module 105, and decoding output module 105 is used for the output decoded data.
Miller-decoded with subcarrier is divided into three kinds, is respectively M=2,4,8 three kind of pattern, Rule of judgment corresponding to these three kinds of patterns as shown in Figure 4, condition processing module 103 finds three kinds of corresponding data to decide decode condition according to the M value.
Shown in accompanying drawing 2 and accompanying drawing 3, Miller code target seeker is comprised of front leading note and the data 010111 of adjacent not saltus step, wherein front leading note can be used for recovered clock, its length is divided into two kinds, during TRext=0, target seeker comprises the front leading note (4 code-element period data 0) of 4 code-element periods, as shown in Figure 2; During TRext=1, target seeker comprises the front leading note (16 code-element period data 0) of 16 code-element periods, as shown in Figure 3.If initial use broad pulse as the counting interval, will walk around that front sound conducting part divides and data 010111 in data 0, directly enter the decoded portion of data 10111.
Shown in accompanying drawing 4, sub-carrier modulation Miller sequence can be found out, the subcarrier Miller-decoded comprises two kinds of broad pulse and burst pulses, and the position that broad pulse occurs is fixing, not only in the middle of code element, also can occur at the code element edge, but regular following still, when M=2, code element has comprised the subcarrier in 2 cycles, i.e. 4 described burst pulses, the burst pulse number between broad pulse can be added up according to this; When M=4, code element comprises 4 cycle subcarriers, and by that analogy, during M=8, code element comprises the subcarrier in 8 cycles, therefore can add up the lower three kinds of dissimilar burst pulse numbers of different M values.Add up by the cumulative number of the burst pulse between broad pulse and obtain list shown in accompanying drawing 5, wherein three row are respectively M=2, and 4,8 third gear, three row represent respectively three kinds of narrow pulse widths, and 0 again to data 1, burst pulse accumulative total number is maximum from data 1 to data in state 1=＞01; State 1=＞00/0=＞01 namely from data 1 to data 0 again to data 0 or data 0 to data 0 again to data 1; State 1=＞1/0=＞0 is namely from data 1 to data 1 or from data 0 to data 0.
Shown in accompanying drawing 6, choosing M=8 is example, and the state information of decoder state machine is carried out diagram, and three kinds of states of appearance can be divided into data 1, data 0 and data 01.The data that occur are respectively 14,22,30 3 kind, wherein 14 appear at data 1 to data 1, or data 0 are in the conversion of data 0; 22 appear at data 1 to data 0, or data 0 through data 0 in the conversion of data 1; 30 only appear at data 1 process data 0 in the conversion of data 1, the state information list of state machine shown in respective figure 5.When the decoding beginning, because front leading note ends up being 1, original position is 1, carries out saltus step and exports corresponding data according to transformation rule, decodes, and after end, decoded result is returned.
Shown in accompanying drawing 7, embodiment of the present invention sub-carrier modulation Miller code coding/decoding method schematic diagram, idiographic flow is as follows:
701: begin decoding;
702: the broad pulse identification module judges whether present input data is broad pulse; If so, enter step 703, if not, enter step 704;
703: Counter Value output, and enter step 706;
When if present input data is broad pulse, will export current Counter Value.
704: judge whether present input data is burst pulse; If so, enter step 707; If not, return to step 701;
After returning to step 701, wait for and input data next time.
705: after count value output, the timer zero clearing, and return to step 701;
When finding the first broad pulse, counter begins counting, finishes this counting during next broad pulse, and beginning is counted again.
706: enter the decoder state machine judgement, the state information of judgement decoder state machine;
If broad pulse is exported count value, and count value is judged, obtain the decoder state machine state information.
707: the Counter Value of burst pulse counting module adds 1, and returns to step 701;
708: the state information 0/1 of output decoder state machine;
Counter Value to input judges, is initiated with 1, and after each decoder state machine state conversion, exports corresponding state information.
709: the judgement target seeker;
Miller subcarrier target seeker coding rule, target seeker comprise data 0 and the data 010111 of one section not saltus step of edge; When finding broad pulse, must in data first 1, thereby begin from here, setting the decoder state machine initial condition is 1.
If be initiated with the target seeker data, enter the decoded data output state.
710: the output decoded data, and complete decoding.
Decoded data output, and whether finish according to separating code length judgement decoding.
Here emphasize down that technical solution of the present invention is mainly used in the UHF rfid interrogator.
The present invention also has numerous embodiments, in every case in spirit of the present invention and essential scope, any change of doing, is equal to replacements, improvement, all within protection scope of the present invention.
Claims (8)
1. sub-carrier modulation Miller code decoding device, it is characterized in that, comprise that the input of described burst pulse counting module is connected with the broad pulse identification module be used to the burst pulse counting module that records the burst pulse number, described broad pulse identification module is used for the broad pulse of identification input data; The output of described burst pulse counting module is connected with the decoder state machine module, and described decoder state machine module is used for determining the decoder state machine state information.
2. sub-carrier modulation Miller code decoding device as claimed in claim 1, is characterized in that, the input of described decoder state machine module is connected with the condition processing module, and described condition processing module is used for arranging the decode condition of described decoder state machine module.
3. sub-carrier modulation Miller code decoding device as claimed in claim 1, is characterized in that, the output of described decoder state machine module is connected with the decoding output module, and described decoding output module is used for the output decoded data.
4. a sub-carrier modulation Miller code coding/decoding method, is characterized in that, judgement input data are broad pulses, or burst pulse;
If burst pulse, the count value of counter adds 1;
If broad pulse is exported count value, and count value is judged, obtain the decoder state machine state information;
Judge according to the decoder state machine state information, if be initiated with the target seeker data, export decoded data.
5. sub-carrier modulation Miller code coding/decoding method as claimed in claim 4, is characterized in that, begins counting when finding first broad pulse, and during to next broad pulse, this counting finishes, and begin counting again.
6. sub-carrier modulation Miller code coding/decoding method as claimed in claim 4, is characterized in that, described target seeker data comprise 4 code-element period data 0 and data 010111.
7. sub-carrier modulation Miller code coding/decoding method as claimed in claim 4, is characterized in that, described target seeker data comprise 8 code-element period data 0 and data 010111.
8. whether sub-carrier modulation Miller code coding/decoding method as claimed in claim 4, is characterized in that, finish according to separating code length judgement decoding.
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| CN105577588A (en) * | 2015-12-22 | 2016-05-11 | 山东大学 | Miller modulation subcarrier sequence decoding method |
| CN105743826A (en) * | 2016-05-11 | 2016-07-06 | 上海上大鼎正软件股份有限公司 | Miller subcarrier decoding method |
| 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105577588A (en) * | 2015-12-22 | 2016-05-11 | 山东大学 | Miller modulation subcarrier sequence decoding method |
| CN105577588B (en) * | 2015-12-22 | 2019-01-18 | 山东大学 | A kind of coding/decoding method of Miller modulating subcarrier sequence |
| CN105743826A (en) * | 2016-05-11 | 2016-07-06 | 上海上大鼎正软件股份有限公司 | Miller subcarrier decoding method |
| CN105743826B (en) * | 2016-05-11 | 2019-02-01 | 上海上大鼎正软件股份有限公司 | A kind of Miller subcarrier coding/decoding method |
| 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 |
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Application publication date: 20130626 |