WO2010000133A1 - 一种数据传输方法 - Google Patents
一种数据传输方法 Download PDFInfo
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- WO2010000133A1 WO2010000133A1 PCT/CN2009/000741 CN2009000741W WO2010000133A1 WO 2010000133 A1 WO2010000133 A1 WO 2010000133A1 CN 2009000741 W CN2009000741 W CN 2009000741W WO 2010000133 A1 WO2010000133 A1 WO 2010000133A1
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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
- H04L25/4904—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 using self-synchronising codes, e.g. split-phase codes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M5/00—Conversion of the form of the representation of individual digits
- H03M5/02—Conversion to or from representation by pulses
- H03M5/04—Conversion to or from representation by pulses the pulses having two levels
- H03M5/14—Code representation, e.g. transition, for a given bit cell depending on the information in one or more adjacent bit cells, e.g. delay modulation code, double density code
Definitions
- the present invention relates to data transmission technology, and more particularly to a data transmission method.
- Radio Frequency Identification is a non-contact automatic identification technology that automatically recognizes target objects and acquires relevant data through radio frequency signals.
- the identification work can work in various harsh environments without manual intervention.
- RFID technology recognizes high-speed moving objects and recognizes multiple labels at the same time, making operation quick and easy.
- the basic working principle of RFID technology is as follows: After the tag enters the magnetic field, it receives the RF signal from the reader, and sends the product information (passive tag, passive tag or passive tag) stored in the tag chip by the energy obtained by the induced current. , or actively send a signal of a certain frequency (Active Tag, active tag or active tag); the reader reads the signal and decodes it, and sends it to the central information system for corresponding data processing.
- the energy required to operate a tag is extracted from the signal from the reader. Therefore, in the process of information transmission from the reader to the tag, it is necessary to take certain measures to increase the energy obtained at the tag end.
- One of the commonly used methods is to increase the signal-to-tag time of the reader; another method is to use a high level as much as possible when encoding the data in the link from the reader to the tag. Reduce the use of low levels.
- the 18000-6 type C (TYPE C) uses Pulse Interval Encoding (PIE).
- Manchester coding is a widely used self-synchronization coding.
- the advantages of this coding method are: It carries rich timing and synchronization information in the coding, and has no DC drift, and the coding process is simple. It replaces the old code with two new binary codes with two different phases for each binary code, which is suitable for information transmission from reader to tag in radio frequency identification.
- One of the coding rules for Manchester coding is:
- 0 ⁇ 01 a periodic square wave of zero phase
- 1 ⁇ 10 a periodic square wave of ⁇ phase
- Manchester coding uses the change of waveform level to distinguish data; when the level changes from low to high, it means binary data "0"; when the level changes from high to low, it means binary data "1"; A jump occurs in the middle of a symbol period.
- the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a data transmission method for improving passive tag energy in RFID.
- the present invention provides a data transmission method in which binary data to be transmitted is encoded and modulated by the following coding principle:
- the binary data x1 after the low-level encoded binary data xl with the intermediate phase does not jump is encoded with a high level in which the intermediate phase does not jump;
- x1 and x2 are 1 and 0, respectively; or xl and x2 are 0 and 1, respectively.
- the coding principles further include:
- the x2 For an x2 after x2 encoded with a falling edge transition, the x2 is encoded with a falling edge transition; for an x2 after x2 encoded with a rising edge transition, it is encoded with a rising edge transition.
- the coding principle further comprises: encoding the binary data xl and x2 with the same length.
- the coding principle further includes: a phase jump of the left edge of the binary data x2.
- the coding principle further includes: encoding an x2 ⁇ after a high-level coded x1 with an intermediate phase non-jumping by a rising edge hopping manner.
- the coding principle further includes: encoding an x2 ⁇ after the low-level encoded xl with the intermediate phase non-jumping by a falling edge hopping manner.
- the coding principle further includes: the left edge of the binary data x2 does not jump in phase.
- the coding principle further includes: encoding an x2 ⁇ after the high-level encoded xl with the intermediate phase non-jumping by a falling edge hopping manner.
- the coding principle further includes: encoding an x2 ⁇ after the low-level coded x1 with the intermediate phase non-jumping by a rising edge hopping manner.
- the use of the encoding method of the present invention in the reader-to-tag link of the RFID system for data transmission can provide more labels to the label than the Manchester encoding. More energy.
- 1 is a flow chart of a data transmission method for a reader to tag for radio frequency identification
- FIG. 2 is a schematic diagram showing a state relationship of data after encoding a pair of binary data of the encoding rule of the present invention
- Figure 3 is a schematic diagram of data symbols when the encoding rule of the present invention is used
- Figure 4 is a diagram showing the data state transition of the encoding rule of the present invention.
- Figure 5 is a schematic diagram of a data sequence when encoding a pair of two binary data using the encoding rule of the present invention
- FIG. 6 is a schematic diagram of an encoding example of the present invention using an encoding rule
- FIG. 7 is a schematic diagram showing an example of encoding when the encoding rule 2 is used in the present invention.
- Figure 9 is a data sequence when encoding two binary data using the encoding rule three of the present invention.
- FIG. 10 is a schematic diagram showing an example of encoding when the encoding rule 3 is used in the present invention.
- Figure 11 is a diagram showing an example of encoding of the present invention using the encoding rule four.
- Step 101 The reader encodes the binary data to be sent;
- Step 102 The reader modulates the encoded data
- Step 103 The reader wirelessly transmits the modulated signal
- Step 104 The tag receives a wireless signal from the reader
- Step 105 The tag demodulates the received wireless signal.
- Step 106 The tag decodes the demodulated signal to obtain the above binary data.
- the encoding rule 1 for encoding the original binary data to be transmitted in this embodiment includes the following contents:
- Binary data 1 is generally represented by a high level, and after continuously encoding two or more binary data 1 with a high level, the binary data 1 followed by encoding is low level, and Restarting the recording of the number of binary data 1 encoded continuously with a high level;
- 1C For binary data 1 after binary data 1 encoded with low level, ⁇ encode with high level.
- the encoding rule 2 used in the encoding of the original binary data to be transmitted in this embodiment includes the following contents:
- 2B Binary data 0 is generally indicated by a high level, and after continuously encoding two or more binary data 0 with a high level, the binary data 0 immediately following it is encoded with a low level. And restart the recording of the number of binary data 0 that is continuously encoded with a high level; 2C: For the binary data 0 after the low-level encoded binary data 0, ⁇ encode with a high level.
- FIG. 2 is a schematic diagram showing the state relationship of data after encoding a pair of binary data of the encoding rule of the present invention.
- binary data 0 jumps in the middle phase of the data symbol; binary data 1 is in the middle phase of the data symbol. No transition; binary data 0 and binary data 1 each have two states.
- the status of binary data 0 is denoted as S2 and S3, and the status of binary data 1 is denoted as S1 and S4.
- binary data 1 can be interchanged.
- the binary data 1 jumps in the middle of the data symbol; the binary data 0 does not jump in the middle phase of the data symbol.
- the status of binary data 1 is denoted as S2 and S3, and the status of binary data 0 is denoted as S1 and S4.
- S2 and S3 are inverted, and S1 and S4 are inverted.
- Fig. 3 is a diagram showing the data symbols of the encoding rule of the present invention. As shown in Fig. 3, binary data 0 and binary data 1 each have two states, the intermediate phase of the data symbol of binary data 0 hops, and the intermediate phase of the data symbol of binary data 1 does not jump.
- Fig. 4 is a diagram showing the state transition of the data using the encoding rule of the present invention. As shown in Figure 4, when the encoding rule is used, the state transition method is as follows:
- binary data 1 When binary data 1 is received: If the binary data corresponding to the current state is the first one of consecutive binary data 1 (ie, the high level is encoded), then a binary data is received. , still maintains the S1 state; if the binary data corresponding to the current state is the second of the continuous binary data 1 (using high level code), and then receives a binary data 1, the state transitions to S4. That is to say, after the two binary data 1 are continuously encoded using the high level, the third binary data is encoded with the low level, see 1B in the encoding rule one.
- S1 state When binary data 1 is received, it transitions to S1 state, see 1C in encoding rule one; when binary data 0 is received, it transitions to S2 state, see 1D in encoding rule one.
- S4 can be expressed as '00, and S2 can be represented as '10, ; when the current state is S4, when binary data is received 0, converting the state to S2 can increase the phase jump and improve the accuracy of data transmission.
- Figure 5 is a diagram showing the sequence of data when encoding a pair of two binary data using the encoding rule of the present invention.
- binary data (0, 0), binary data (0, 1), and binary data (1, 0) are encoded in two forms;
- the binary data (1, 1) is encoded in the following three forms:
- Figure 5 (g) is the first and second binary following the binary data 0 or binary data 1 encoded with low level.
- the form of Fig. 5 (h) is the pattern of the second and third binary data 1 following the binary data 0 or the binary data 1 encoded with the low level;
- the form of 5 ( i ) is a form of continuous third and fourth binary data 1 encoding following binary data 0 or binary data 1 encoded with low level;
- the above form is uniquely determined by the encoding rule and the initial state of the data.
- Fig. 6 is a view showing an example of encoding of the present invention using the encoding rule.
- the upper and lower graphs respectively correspond to different initial states of the first binary data.
- the first binary data 0 in the above figure is encoded as '10; the first binary data 0 in the following figure is encoded as '01, and so encoded.
- the encoded waveforms of the upper and lower images tend to be consistent.
- Fig. 7 is a view showing an example of encoding of the present invention using the encoding rule two.
- the upper and lower graphs respectively correspond to different initial states of the first binary data.
- the first binary data 0 in the above figure is encoded as '11; the first binary data '0 in the figure below is encoded as '00, '
- the encoded waveforms of the upper and lower images tend to be consistent.
- the encoding rule 3 for encoding the original binary data to be transmitted in this embodiment includes the following contents:
- Binary data 1 is generally represented by a high level, and after continuously encoding two or more binary data 1 with a high level, the binary data 1 followed by encoding is low level, and Restarting the recording of the number of binary data 1 encoded continuously with a high level;
- 3D Under the premise of satisfying 3A and 3B, that is, using as high a level as possible, the left edge of binary data 0 does not jump, and the phase jumps on the right side.
- the encoding rule 4 used in the encoding of the original binary data to be transmitted in this embodiment includes the following contents:
- Binary data 0 is generally represented by a high level, and after continuously encoding two or more binary data 0 with a high level, the binary data 0 immediately following it is encoded with a low level. And restarting the recording of the number of binary data 0 encoded continuously with a high level;
- the data state relationship diagram of the encoding rule 3 and the 4 pairs of binary data encoded by the present invention, and the data sequence diagrams of the encoding rules 3 and 4 when the present invention are used are respectively the same as the encoding rules 1 and 2, respectively. Describe separately.
- Figure 8 is a diagram showing the state transition of data when the encoding rule 3 of the present invention is used. As shown in Figure 8, when the encoding rule is used, the state transition method is as follows:
- binary data 1 When binary data 1 is received: If the binary data corresponding to the current state is the first one of consecutive binary data 1 (ie, the high level code is used), then another one is received. Binary data 1 remains in the SI state; if the binary data corresponding to the current state is the second of consecutive binary data 1 (high level coded), and then receives a binary data 1, the state transitions to S4. That is to say, after the two binary data 1 are continuously encoded using the high level, the third binary data is encoded with the low level, see 3B in the encoding rule 3.
- Figure 9 is a diagram showing the sequence of data when encoding two binary data using the encoding rule three of the present invention.
- binary data (0, 0), binary data (0, 1), and binary data (1, 0) are encoded in two forms;
- the binary data (1, 1) is encoded in the following three forms:
- Figure 9 (g) is the first and second binary following the binary data 0 or binary data 1 encoded with low level.
- the form of Fig. 9 (h) is the pattern of the second and third binary data 1 following the binary data 0 or the binary data 1 encoded with the low level;
- 9 ( i ) is in the form of binary data 0 or ⁇ low-level coded binary
- the form of the continuous third and fourth binary data 1 encoding after the data 1; the above form is uniquely determined by the encoding rule and the initial state of the data.
- Figure 10 is a diagram showing an example of encoding of the present invention using the encoding rule three.
- the upper and lower graphs respectively correspond to different initial states of the first binary data.
- the first binary data 0 in the above figure is encoded as '10; the first binary data 0 in the following figure is encoded as '01, and so encoded.
- the encoded waveforms of the upper and lower images tend to be consistent.
- Figure 11 is a diagram showing an example of encoding of the present invention using the encoding rule four.
- the upper and lower graphs respectively correspond to different initial states of the first binary data.
- the first binary data 0 in the above figure is encoded as '11; the first binary data '0 in the figure below is encoded as '00, '
- the encoded waveforms of the upper and lower images tend to be consistent.
- the encoding rule 1 is taken as an example to analyze the energy occupied by the encoding method of the present invention and the bandwidth occupied by the signal, and compared with the Manchester encoding.
- the duration of the high and low levels is the same, half each.
- the encoding rule 1 of the present invention When encoding binary data 0, the encoding rule 1 of the present invention has the same high level duration (length) as the Manchester encoding, and for binary data 1, 1B, 1C and 1D according to the encoding rule one.
- the duration (length) of the high level after encoding is longer than the Manchester encoding. Therefore, the coding rule 1 proposed by the present invention is superior to Mann in providing energy for the tag. Chester coding.
- the encoding rules 2, 3, and 4 of the present invention have the same effect.
- the symbol waveforms representing binary data 1 and binary data 0 are shown in Fig. 2.
- the symbolic expressions are giO) and g Q ), respectively, and the power spectrum of the random sequence consisting of the encoding of the present invention is:
- the transmission probability of P is gi )
- the transmission probability of go the transmission probability of go
- G. (/) are the spectral functions of & (0 and g.(t) respectively.
- the bandwidth of a random sequence mainly depends on the spectral function G 0 (/) or (/) of a single symbol waveform, and one of the larger bandwidths should be taken as the sequence bandwidth.
- the binary data 1 and the binary data 0 are encoded as non-return-to-zero pulses, and the other is semi-empty zero-return pulse, so the bandwidth occupied by the encoded signal is 2fs;
- both data 1 and data 0 are encoded as half-duty return-to-zero pulses, so the encoded signal occupies a bandwidth of 2fs.
- the coded bandwidth occupied by the encoding rule 1 proposed by the present invention is the same as the occupied bandwidth of the Manchester encoded signal.
- the same conclusions are obtained for the coding rules 2, 3, and 4 of the present invention, and are not described herein again. From the above analysis, it can be seen that the encoding method of the present invention is used in the reader-to-tag link of the RFID system, and the tag can be provided with more energy than the Manchester code, while the signal occupancy bandwidth is constant.
- the encoding method of the present invention is used in the reader-to-tag link of the RFID system, and the tag can be provided with more energy than the Manchester code, so that the signal occupation bandwidth is constant, and therefore has a strong industrial Practicality.
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US13/001,048 US8599939B2 (en) | 2008-07-02 | 2009-07-01 | Data transmission method |
EP09771903.3A EP2299597B1 (en) | 2008-07-02 | 2009-07-01 | Data transmission method |
JP2011515066A JP5226866B2 (ja) | 2008-07-02 | 2009-07-01 | データ転送方法 |
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CN101989329B (zh) * | 2010-11-09 | 2012-10-10 | 中国人民解放军国防科学技术大学 | 一种应用于射频识别系统中的数据编码方法 |
CN102055482B (zh) * | 2010-11-09 | 2013-04-03 | 中国人民解放军国防科学技术大学 | 一种应用于无源射频识别系统中标签端的数据编码方法 |
CN107241757B (zh) * | 2016-03-29 | 2019-08-13 | 中国移动通信有限公司研究院 | 一种基于无线射频识别的室分天馈监控方法及系统 |
CN105743826B (zh) * | 2016-05-11 | 2019-02-01 | 上海上大鼎正软件股份有限公司 | 一种米勒副载波解码方法 |
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US8599939B2 (en) | 2013-12-03 |
US20110096871A1 (en) | 2011-04-28 |
CN101620663B (zh) | 2012-05-09 |
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