WO2004064346A1 - 非接触rfidシステムの通信方法、非接触rfidシステム、送信機及び受信機 - Google Patents
非接触rfidシステムの通信方法、非接触rfidシステム、送信機及び受信機 Download PDFInfo
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- WO2004064346A1 WO2004064346A1 PCT/JP2004/000190 JP2004000190W WO2004064346A1 WO 2004064346 A1 WO2004064346 A1 WO 2004064346A1 JP 2004000190 W JP2004000190 W JP 2004000190W WO 2004064346 A1 WO2004064346 A1 WO 2004064346A1
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- 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
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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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
Definitions
- the present invention relates to a contactless RF ID (Radio Frequency IDentification) system, and in particular, to a communication method of a contactless RF ID system using a code that can easily separate data and clock without lowering the data transfer speed, RF ID system, transmitter and receiver
- Non-contact RF ID systems are classified into two types: a contact type that is used in close contact with the reader, a proximity type that is used at a distance of about 20 cm, and a remote type that is used at a distance of about 50 cm or more.
- the close contact type is mainly applied to credit cards, etc.
- the close contact type is applied to commuter passes, ID cards, etc.
- the remote type is applied to distribution system tags and the like.
- the contact type and the proximity type receive information and power mainly from a magnetic field. Remote types receive their supply by radio waves.
- the reception power of the remote type is particularly weak, and low power consumption operation and high-efficiency power supply are the subjects of development.
- FIG 11 shows the configuration of a conventional contactless RF ID system.
- the contactless RF ID system consists of a reader 1 and a transbonder 2.
- the transbonder 2 includes an antenna 2A, a DC power detection circuit 200, a signal detection circuit 201, an input amplifier 202, a clock generation circuit using a phase locked loop and a reference circuit, and the like.
- ⁇ ⁇ ⁇ It has a demodulator 203, a control logic circuit 204, and a memory 205.
- the DC power detection circuit 200 includes a diode D1, a power supply diode D2, and a power storage capacitor C1.
- the signal detection circuit 201 includes a diode D1, a detection diode D3, a load capacitor C2, and a? It has £ d switch ⁇ 31.
- an amplitude modulation signal including clock and data information is transmitted from the reader 1 to the transbonder 2 via the antenna 1A.
- the transbonder 2 operates using the voltage across the capacitor C1 as an electromotive force.
- the signal detected by the detection diode D3 in the signal detection circuit 201 is separated into data and clock by the clock generation circuit and demodulation circuit 203, and is processed by the control logic circuit 204.
- the transponder 2 When the transponder 2 returns to the reader 1, it turns on / off the FET switch Q1 and modulates the impedance of the antenna 2A using the load capacitor C2.
- Non-Patent Document 1 Manchester codes are applied to data communication between a transbonder and a reader.
- Figure 12A shows the modulation waveform using Manchester codes.
- Manchester code the transition from high level (high voltage state) to low level (low voltage state) is assigned to code “1”, and the transition from low level (low voltage state) to high level (high voltage state) is code “0”. ".
- the Manchester code realizes a 50% duty signal by setting the high-level and low-level times equal, and realizes a code suitable for communication without DC offset.
- the codes ⁇ 0 '' and ⁇ 1 '' are determined according to the order of appearance of the high-level and mouth-level states, the high-level and low-level states are determined. Need to detect.
- the interval between the falling and rising state transition times changes depending on the data, so a phase-locked loop and an oscillator are required to generate the clock signal, and time is required for the clock to converge. It takes. In order to satisfy the pull-in condition of the phase-locked loop, it is necessary to cancel the temperature, the power supply voltage, and the device process fluctuation. Therefore, a complicated reference circuit is required, and the current consumption increases. If communication is temporarily interrupted due to the radio wave condition, it takes time to converge the clock, and there is a problem that a long pull-in time is required.
- a contact RF ID system has been proposed (see Japanese Patent Application Laid-Open No. 11-35555).
- Figure 13A shows the waveforms and symbols used for communication in other conventional contactless RF ID systems. As shown in FIG. 13B, the rising and falling intervals of the transmitted and received waveforms are equal.
- Waveform A is a waveform obtained by extending the high-level state by T / 2 (T is one cycle) in the positive time direction and the low-level state by TZ2 in the negative time direction from the rising point.
- Waveform B keeps the high level state for the time t1 in the positive time direction from the rising point, keeps the low level state for the time t2 until it reaches the end point of the waveform, and in the negative time direction from the rising point.
- This is a waveform in which the mouth level state is held for t1 and the time t2 until the start point of the waveform is held in the high level state.
- Waveforms ⁇ and ⁇ always have a rising state transition at the center. Assign signs “0” and “1” to waveforms ⁇ and ⁇ alone As shown in FIG. 14, when the waveform B is continuous, a rising state transition occurs at the connection part of the waveform, and it becomes difficult to correspond the rising timing to one data. When waveform B is continuous, the rising transition occurs at the junction of the waveform because waveform B starts at a high level and ends at a low level.
- the sign “0” is assigned when the waveform A continues twice in succession
- the sign “1” is assigned when the waveform A follows the waveform B.
- the two continuous waveforms of waveform A corresponding to the code “0” start at the low level and end at the high level
- the continuous waveforms B and A corresponding to the code “1” start at the high level and end at the high level I do.
- FIGS. 15A to 15D show combinations of all four possible connection portions of “00”, “01”, “10”, and “11”.
- the combinations of waveforms A and B have many variations, such as swapping waveforms A and B, and assigning code "1" when waveform B follows waveform A.
- the combination that makes the rising interval constant is realized by combining a waveform pattern that starts at the mouth level and ends at the high level, and a waveform pattern that starts at the mouth level or the high level and ends at the same level as the beginning.
- To make the fall intervals constant combine a waveform pattern that starts at a high level and ends at the mouth level, and a waveform pattern that starts at a low or high level and ends at the same level as the beginning.
- the duty is 50 according to the other conventional examples. /.
- the present invention has been made in view of such circumstances, and provides a communication method, a non-contact RF ID system, a transmitter, and a receiver of a non-contact RF ID system that improve transmission efficiency by encoding. Aim. Disclosure of the invention
- the communication method of the non-contact RF ID system is a communication method of the non-contact RF ID system using a first waveform, a second waveform, and a third waveform, wherein the first waveform, the second waveform, Either the rising timing or the falling timing of the waveform output when communicating using the waveform and the third waveform becomes periodic.
- the first waveform and the second waveform are each formed of a basic waveform having a rising or falling state transition at a central portion of the approximate waveform, and the third waveform includes the one state transition. It is also acceptable that the third waveform is formed by a plurality of basic waveforms having a central part of the schematic waveform, and the one state transition is generated only in the central part of the schematic waveforms of the plurality of basic waveforms. ,.
- the first waveform and the second waveform are replaced. Then, communication may be performed using the third waveform.
- the third waveform when either the first waveform or the second waveform is continuous, the same rising or falling state transition occurs at the connection part of the waveform as at the center of the waveform,
- the combination of the first waveform or the second waveform including the connection portion of the waveform in which the state transition occurs includes m waveforms, a waveform used in place of the m waveforms (where, m Is a natural number of 2 or more.
- the high-level state is maintained for t ⁇ 2 (nk) + 6 ⁇ in the positive time direction from the rising point of the (n + 1— k) th waveform, and t ⁇ 2 (nk) + 3 ⁇ in the negative time direction.
- t ⁇ 2 (nk) + 6 ⁇ in the positive time direction from the rising point of the (n + 1— k) th waveform
- t ⁇ 2 (nk) + 3 ⁇ in the negative time direction From the rising edge of the n-th waveform, hold the high-level state in the positive time direction by TZ2, and keep the low-level state in the negative time direction by t ⁇ 2 (n-1) + 3 ⁇ Hold, hold the high level state in the positive time direction from the rising point of the (n + 1) th waveform for t ⁇ 2 (n-1) + 3 ⁇ , and hold the high level state in the negative time direction for TZ 2 in the negative time direction.
- ⁇ Hold the low-level state for only t6, hold the open-level state in the negative time direction from the last waveform rising point by t6, and hold the time in the positive time direction.
- the time t4 to the start of the waveform is maintained at the high level, and the high level is maintained in the positive time direction from the rise time of the (n + 1-k) th waveform. Holds only ⁇ 2 (n ⁇ k) + 6 ⁇ and goes low in the negative time direction by t ⁇ 2 (nk) + 3 ⁇ From the rising edge of the (n + 1) th waveform, hold the high-level state for t ⁇ 2 (n-1) +5 ⁇ in the positive time direction, and t ⁇ 2 ( n— 1) +5 ⁇ and keeps the high level in the positive time direction from the rise of the ( ⁇ + 1 + k) th waveform by t ⁇ 2 (nk) +3 ⁇ Hold, hold the low-level state for t ⁇ 2 (nk) +6 ⁇ in the negative time direction, hold the open-level state for the time point t6 in the negative time direction from the last waveform rising point, and hold in the positive time direction Waveform C (2 n + 1) where the high level state is held for time
- the first waveform holds the ⁇ level state by ⁇ 2 in the negative time direction from the first rising point, which is the middle point of the waveform, and A waveform obtained by inverting the waveform holding the high level state by ⁇ / 2 in the more positive time direction, wherein the second waveform is a positive time from the first rising point which is the middle point of the waveform.
- the waveform C (2 n) is inverted from the waveform C (2 n) that holds the high level state for the time t3 in the positive time direction and holds the low level state for the time t4 to the end point of the waveform in the positive time direction.
- T is one period of the first and second waveforms
- t 3+ t 4 T / 2
- t ⁇ 2 (n— k) +5 ⁇ + t ⁇ 2 (nk) +6 ⁇ T (when n, k ⁇ 2)
- Is a low-level waveform C (2 n + 1) inverted waveform (where n and k are natural numbers, n ⁇ k ⁇ 1, t is time, T is one cycle of the first and second waveforms, t 3 + t 4 T / 2, t ⁇ 2 (nk) +5 ⁇ + t ⁇ 2 (nk) +6 ⁇ 2 T.)
- a third waveform used as a substitute for the combination of the first waveform and the second waveform by assigning a sign “1” or a sign “0” to the first waveform and the second waveform.
- the communication may be performed by assigning a combination of a code “1” or a code “0” corresponding to the combination.
- a clock generating means for generating an internal clock so that a state transition of the internal clock occurs in synchronization with the rising timing of the modulation signal; and in synchronization with a state transition of the clock generated by the clock generating means. And an operating logic circuit. No.
- the transmitter according to the present invention is a transmitter that forms a first waveform, a second waveform, and a third waveform, and transmits the first waveform, the second waveform, and the third waveform
- the first waveform and the second waveform are each formed by a basic waveform having one of the rising and falling state transitions at the center of the waveform, and the third waveform schematically represents the one state transition.
- the third waveform is formed by a plurality of basic waveforms having a central portion of the waveform, wherein the one of the state transitions occurs only at the central portion of the general waveform of the plurality of basic waveforms.
- a receiver is a receiver that receives a first waveform, a second waveform, and a third waveform, wherein one of the first waveform and the second waveform rises or falls.
- the third waveform is formed by a plurality of basic waveforms having the one state transition at the center of the general waveform
- the third waveform is formed by a plurality of basic waveforms having the one state transition at the center of the general waveform.
- the one state transition occurs only at the center of the schematic waveforms of the plurality of basic waveforms, and when the third waveform is received, the one state transition is performed at the center of the schematic waveform of the basic waveform. It is recognized that a combination of the first waveform or the second waveform generated in any other than the above has been received.
- the first waveform and the second waveform are each formed of a basic waveform having one of state transitions of a rising edge and a falling edge at the center of the approximate waveform
- the third waveform is The third waveform is formed by a plurality of basic waveforms having the one state transition at the center of the schematic waveform, and the third waveform is such that the one state transition occurs only at the center of the schematic waveform of the plurality of basic waveforms,
- the second waveform is continuous.
- a third waveform that does not cause a rising (or falling) state transition at the connection point of the waveform is assigned by the transmitting side instead of the continuous second waveform, and is transmitted.
- Continuous when the third waveform is received Recognizes that it has received the second waveform can be solved by demodulating substantially the first waveform, the code "0" and the second waveform alone, be allocated to "1" Therefore, the rising (or falling) timing can correspond to one data. Therefore, a clock signal synchronized with data can be easily generated by using a circuit that detects a rising (or falling) transition.
- FIG. 1 is a block diagram showing a configuration of a contactless RF ID system according to an embodiment of the present invention.
- FIGS. 2A and 2B are diagrams showing an example of various waveforms used in the non-contact RF ID system according to the embodiment of the present invention and an example of a code sequence at the time of communication by assigning a code to each waveform.
- FIG. 3 is a diagram showing an example of a waveform C (3) used in the non-contact RF ID system according to the embodiment of the present invention.
- FIG. 4 is a diagram showing an example of a waveform C (4) used in the non-contact RF ID system according to the embodiment of the present invention.
- FIG. 5 is a diagram showing an example of a waveform C (5) used in the non-contact RF ID system according to the embodiment of the present invention.
- FIG. 6 is a diagram illustrating an example of a waveform C (6) used in the non-contact RF ID system according to the embodiment of the present invention.
- FIG. 7 is a diagram (n is a natural number) showing an example of a waveform C (2n + 1) used in the non-contact RF ID system according to the embodiment of the present invention.
- FIG. 8 is a diagram (n is a natural number) showing an example of a waveform C (2 n) used in the non-contact RF ID system according to the embodiment of the present invention.
- FIGS. 9A and 9B are diagrams showing comparative examples of reference numerals in the case where the other conventional example is used and the case where the present embodiment is used.
- FIG. 10 is a diagram showing a combination example of codes used in the contactless RF ID system according to the embodiment of the present invention.
- FIG. 11 is a block diagram showing the configuration of a conventional contactless RF ID system.
- Figure 12-8 and Figure 12B show the Manche used in the conventional contactless RF ID system. It is a figure showing a star code waveform.
- FIGS. 13 and 13B are diagrams showing waveforms and symbols used in other conventional non-contact RF ID systems.
- FIG. 14 is an explanatory diagram showing a problem when the waveform B is continuous in another conventional example.
- FIGS. 15A to 15D are explanatory diagrams showing states of connecting portions of codes used in other conventional examples.
- FIG. 16 is a diagram showing a code list of another conventional example. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows the configuration of the contactless RF ID system of the present embodiment.
- the contactless RF ID system of the present embodiment includes a reader 1 for reading data, and a transbonder 2 for receiving a signal including data and a clock transmitted from the reader 1.
- the transbonder 2 includes an antenna 2A, a DC power detection circuit 200, a signal detection circuit 201, an input amplifier 202, a clock generation circuit and a demodulator 3 that do not require a phase locked loop and a reference circuit. 0, a control logic circuit 204, and a memory 205.
- the DC power detection circuit 200 includes a diode D1, a power supply diode D2, and a power storage capacitor C1.
- the signal detection circuit 201 includes a diode D1, a detection diode D3, a load capacitor C2, and a FET switch Q1.
- the reader 1 transmits an amplitude modulated signal including clock and data information to the transbonder 2 via the antenna 1A.
- the transbonder 2 receives a signal via the antenna 2A, the electric charge is stored in the power storage capacitor C1, and the transbonder 2 operates using the voltage across the capacitor C1 as an electromotive force.
- the signal detected by the detection diode D3 in the signal detection circuit 201 is separated into data and clock by the clock generation circuit and demodulation circuit 300, and the control logic circuit Processed on two routes 204.
- the transbonder 2 sends a reply to the reader 1, the FET switch Q1 is turned on and off, and the impedance of the antenna 2A is modulated by using the load capacitor C2.
- the non-contact RF ID system of the present embodiment is different from the conventional non-contact RF ID system shown in FIG. 11 in the configuration, mainly in that a clock generation circuit using a phase locked loop and a reference circuit and Instead of the demodulation circuit 203, a clock generation circuit and a demodulation circuit 300 that do not require a phase locked loop and a reference circuit are used, and other configurations are the same.
- FIGS. 2A and 2B show waveforms used in the contactless RF ID system of the present embodiment and waveforms of a code string (data) for communicating by assigning codes to these waveforms.
- the rising intervals of the transmitted and received waveforms are made equal.
- the transmitted and received waveforms are obtained by combining waveforms A and B shown in Fig. 2A.
- waveform A is a waveform obtained by extending the high level state by T / 2 (T is one cycle time) in the positive time direction and the low level state by TZ 2 in the negative time direction from each rising point. is there.
- Waveform B holds the high level state for the time t1 in the positive time direction from the rising point, holds the low level state for the time t2 until the end point of the waveform, and the negative time direction from the rising point.
- a low-level state is held for t1
- a time t2 up to the starting point of the waveform is held in a high-level state.
- Waveforms ⁇ and ⁇ always have a rising state transition at the center. If the signs ⁇ and 1 are assigned to waveforms ⁇ and ⁇ alone, if waveform ⁇ is continuous as shown in Fig. 14, a rising state transition occurs at the connection of the waveforms, and the rising timing It becomes difficult to correspond to one data.
- a new waveform C that does not cause a rising state transition at the connection portion of the waveform is assigned on the transmitting side instead of the continuous waveform ⁇ and transmitted, and the waveform C is transmitted on the receiving side.
- continuous waveform ⁇ is recognized as received and demodulated.
- waveform ⁇ is assigned to code "0" and waveform B is assigned to code "1".
- Waveform C (2) is the waveform used in place of two consecutive waveforms B, From the rising edge of the waveform, hold the high-level state for only TZ2 in the positive time direction, hold the high-level state for t3 in the negative time direction, hold the time t up to the start point of the waveform in the high-level state, In addition, from the rising edge of the last waveform, the open-level state is maintained for only TZ2 in the negative time direction, the high-level state is maintained for the time t3 in the positive time direction, and the time t4 until the end point of the waveform is low level This is the waveform held in the state.
- FIG. 3 shows an example of a waveform C (3) to be assigned instead of three consecutive waveforms B.
- This waveform C (3) has a high level state for t6 in the positive time direction from the rising edge of the first waveform instead of three consecutive waveforms B, and is open level for t3 in the negative time direction.
- FIG. 4 shows an example of a waveform C (4) to be assigned in place of four consecutive waveforms B.
- Waveform C (4) holds the high-level state for t6 in the positive time direction from the rising edge of the first waveform instead of 4 consecutive waveforms B, and exits for t3 in the negative time direction. ⁇ Hold the level state and set the time t4 to the start point of the waveform to the high level state. Hold, and hold the oral level state in the negative time direction from the rising point of the second waveform by t5, and hold the high level state by the time T / 2 in the positive time direction.
- Holds the output state for T 2 in the negative time direction from the rising timing time holds the high level state for time t 5 in the positive time direction, and is more negative than the rising point of the last waveform.
- This is a waveform in which the mouth level state is held in the time direction by t6, the high level state is held in the positive time direction by time t3, and the time t4 to the end point of the waveform is held in the low level state.
- FIG. 5 shows an example of a waveform C (5) to be assigned instead of the waveform B which is continuous five times.
- Waveform C (5) holds the high-level state for t6 in the positive time direction from the rising edge of the first waveform instead of the waveform B for 5 consecutive times, and exits for t3 in the negative time direction.
- Hold the ⁇ level state hold the time t 4 to the start point of the waveform at the high level state, hold the oral level state by the time point t 5 in the negative time direction from the rising point of the second waveform, and hold the positive time direction
- Hold the high level state for the time t8 hold the low level state in the negative time direction from the rising edge of the third waveform for the time t7, and hold the high level state for the time t7 in the positive time direction.
- Hold a low-level state in the negative time direction from the rising point of the fourth waveform by t8 hold a high-level state in the positive time direction by the time t5, and negative from the rising point of the last waveform.
- a low level state is maintained in the time direction for t6. This is a waveform in which a high level state is held in the positive time direction for a time t3 and a time t4 until the end point of the waveform is held in a low level state.
- FIG. 6 shows an example of a waveform C (6) to be assigned instead of the waveform B which is continuous for 6 times.
- Waveform C (6) retains a high-level state for t6 in the positive time direction from the rising edge of the first waveform instead of waveform B for 6 consecutive times, and for t3 in the negative time direction. ⁇ Hold the level state, hold the time t 4 to the beginning of the waveform at the high level state, hold the mouth level state in the negative time direction from the rising point of the second waveform by t 5, and hold the positive time direction Hold the high-level state for the time t8, hold the low-level state in the negative time direction from the rising edge of the third waveform for the time t7, and hold the high-level state for the time T2 in the positive time direction.
- a low-level state is maintained for only T / 2 in the negative time direction from the rising edge of the fourth waveform, and a high-level state is maintained for time t7 in the positive time direction, and the fifth waveform
- waveform C (6) on the transmitting side instead of waveform B, which is a sequence of six, no rising transition occurs at the connection of the waveforms, so that the rising timing can correspond to one data. Therefore, by using a circuit that detects a rising transition, a clock signal synchronized with data can be easily generated.
- Fig. 7 shows an example of a waveform C (2n + 1) assigned instead of (2n + l) continuous waveforms B, where n is a natural number.
- Waveform C (2 n + 1) holds (2 n + l) continuous waveforms B, instead of the rising edge of the first waveform, holds the high-level state in the positive time direction for t6 and negative time Holds the high-level state for t3 in the direction, holds the high-level state t4 to the start point of the waveform, and sets the high-level in the positive time direction from the rising point of the (n + 1-k) th waveform
- the state is held for t ⁇ 2 (n ⁇ k) +6 ⁇ and the low level is held for t ⁇ 2 (nk) +3 ⁇ in the negative time direction.
- Hold the high-level state in the positive time direction t ⁇ 2 (nk) +3 ⁇ from the rising edge of the ( ⁇ + 1 + k) th waveform, and t ⁇ 2 (nk) + 6 in the negative time direction ⁇ Hold the low-level state for the time t6 in the negative time direction from the rising edge of the last waveform, and hold the high-level state for the time t3 in the positive time direction.
- FIG. 8 shows an example of (2n) waveforms C (2n) to be assigned instead of the continuous waveform B (n is a natural number). .
- the waveform C (2n) holds a high-level state for the time t6 in the positive time direction from the rising edge of the first waveform, and in the negative time direction. Holds the high-level state for t3, holds the time t4 to the beginning of the waveform at the high level, and changes the high-level state in the positive time direction from the rising point of the (n + 1-k) th waveform to t ⁇ 2 (nk) +6 ⁇ , and t ⁇ 2
- FIGS. 9A and 9A show comparison examples of the code lengths when the communication is performed by the non-contact RF ID system using the other conventional communication method and when the communication is performed using the non-contact RF ID system of the present embodiment. See 9B.
- the code length can be reduced to half compared with the case of using other conventional communication methods, and the transmission efficiency can be improved by coding.
- the combinations of the waveforms A and B can have many variations such as the waveforms A and B replaced.
- completely symmetrical waveforms are used as the waveforms A, B, and C.
- the delay characteristics and time constants of various circuits used for modulation and demodulation are used. It is not always necessary to handle completely symmetric waveforms. It is sufficient to handle a waveform in which the rise or fall timing is approximately constant and the duty is approximately 50%. In this case, it is possible to minimize erroneous determinations for amplitude fluctuations.
- the embodiments described above are merely examples of the present invention, and do not limit the present invention.
- the present invention can be embodied in various other modified forms and modified forms. For example, not only amplitude modulation but also frequency modulation and phase modulation It may be used. Further, a modulation method combining amplitude modulation, frequency modulation, phase modulation and the like may be adopted. Furthermore, by encrypting the signal sequence, the security against eavesdropping and spoofing may be improved, or encoding may be performed for the purpose of error detection or error correction. Industrial applicability
- the first waveform and the second waveform are each formed by a basic waveform having one of state transitions of a rising edge and a falling edge in a central portion of the approximate waveform
- the third waveform is the one waveform.
- the third waveform is formed by a plurality of basic waveforms having a state transition at the center of the general waveform, and the third waveform is generated only at the center of the general waveform of the plurality of basic waveforms.
- a third waveform that does not cause a rising (or falling) state transition at the connection point of the waveform is assigned by the transmitting side instead of the continuous second waveform, and transmitted.
- the waveform of 3 Recognize the waveform 2 as received and demodulate it.
- the first waveform and the second waveform can be assigned to the signs “0” and “1” independently, so that the rising (or falling) timing can correspond to one data,
- the code length can be reduced by half compared with the case of using the conventional communication method, and the transmission efficiency can be improved by encoding.
- a clock signal synchronized with data can be easily generated. Therefore, if state transitions occurring at equal intervals are used as triggers, a clock synchronized with data can be easily obtained without using a phase locked loop.
- a communication method of a non-contact RF ID system, a non-contact RF ID system, a transmitter, and a reception device that improve transmission efficiency by encoding without using a complicated phase locked loop and a reference circuit. Machine can be realized.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005507675A JP3803364B2 (ja) | 2003-01-15 | 2004-01-14 | 非接触rfidシステムの通信方法、非接触rfidシステム、送信機及び受信機 |
US10/519,858 US7738838B2 (en) | 2003-01-15 | 2004-01-14 | Non-contact RF ID system communication method, non-contact RF ID system, transmitter, and receiver |
EP04702051A EP1585280B1 (en) | 2003-01-15 | 2004-01-14 | Non-contact RF ID system communication method, non-contact RF ID system, transmitter, and receiver |
CN200480000101.3A CN1698330B (zh) | 2003-01-15 | 2004-01-14 | 非接触rf id系统的通信方法,非接触rf id系统,发报机以及接收机 |
US12/813,928 US20100245051A1 (en) | 2003-01-15 | 2010-06-11 | Communication Method for Noncontact RF ID System, Noncontact RF ID System, and Transmitter and Receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-7474 | 2003-01-15 | ||
JP2003007474 | 2003-01-15 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/813,928 Division US20100245051A1 (en) | 2003-01-15 | 2010-06-11 | Communication Method for Noncontact RF ID System, Noncontact RF ID System, and Transmitter and Receiver |
Publications (1)
Publication Number | Publication Date |
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WO2004064346A1 true WO2004064346A1 (ja) | 2004-07-29 |
Family
ID=32709116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/000190 WO2004064346A1 (ja) | 2003-01-15 | 2004-01-14 | 非接触rfidシステムの通信方法、非接触rfidシステム、送信機及び受信機 |
Country Status (5)
Country | Link |
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US (2) | US7738838B2 (ja) |
EP (1) | EP1585280B1 (ja) |
JP (1) | JP3803364B2 (ja) |
CN (1) | CN1698330B (ja) |
WO (1) | WO2004064346A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010074785A (ja) * | 2008-09-22 | 2010-04-02 | Yokosuka Telecom Research Park:Kk | 波形生成回路およびタグ通信装置 |
JP2011526444A (ja) * | 2008-07-02 | 2011-10-06 | ゼットティーイー コーポレーション | データ転送方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9537704B2 (en) | 2006-05-24 | 2017-01-03 | At&T Intellectual Property I, L.P. | Method and apparatus for migrating active communication session between terminals |
CN106888036B (zh) * | 2011-12-16 | 2020-02-18 | 英特尔公司 | 使用时变天线模块的无线通信装置 |
US20140065982A1 (en) | 2012-09-05 | 2014-03-06 | Seong-Youp Suh | Plug-and-play time-variant antenna module for wireless communication devices |
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JPS5413708A (en) * | 1977-07-04 | 1979-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Code conversion system |
JPH1013393A (ja) * | 1996-06-18 | 1998-01-16 | Sony Corp | ディジタル信号の伝送方法、エンコーダ及びデコーダ |
JPH11355365A (ja) * | 1998-06-05 | 1999-12-24 | Hitachi Ltd | 非接触カードの通信方法及び該通信に用いる集積回路 |
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GB2079566B (en) * | 1980-05-16 | 1985-01-09 | Racal Recorders Ltd | Data encoding and/or decoding |
US5058141A (en) * | 1990-03-01 | 1991-10-15 | Ag Communication Systems Corporation | Single circuit for detecting a frame synchronization pattern and generating control signals |
TW391084B (en) * | 1997-09-29 | 2000-05-21 | Sharp Kk | Data communication receiving element |
TR200002599T2 (tr) * | 1998-03-11 | 2000-11-21 | Thomsom Licensing, S.A. | Dijital sinyal modulasyon sistemi. |
US6943678B2 (en) * | 2000-01-24 | 2005-09-13 | Nextreme, L.L.C. | Thermoformed apparatus having a communications device |
US6784813B2 (en) * | 2001-02-12 | 2004-08-31 | Matrics, Inc. | Method, system, and apparatus for remote data calibration of a RFID tag population |
US6864734B2 (en) * | 2001-02-14 | 2005-03-08 | Thine Electronics, Lnc. | Semiconductor integrated circuit |
US20030011474A1 (en) * | 2001-07-13 | 2003-01-16 | Ng Sing King | Circuit and method for electronic security seal |
-
2004
- 2004-01-14 CN CN200480000101.3A patent/CN1698330B/zh not_active Expired - Fee Related
- 2004-01-14 JP JP2005507675A patent/JP3803364B2/ja not_active Expired - Fee Related
- 2004-01-14 EP EP04702051A patent/EP1585280B1/en not_active Expired - Fee Related
- 2004-01-14 WO PCT/JP2004/000190 patent/WO2004064346A1/ja active Application Filing
- 2004-01-14 US US10/519,858 patent/US7738838B2/en not_active Expired - Fee Related
-
2010
- 2010-06-11 US US12/813,928 patent/US20100245051A1/en not_active Abandoned
Patent Citations (3)
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JPS5413708A (en) * | 1977-07-04 | 1979-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Code conversion system |
JPH1013393A (ja) * | 1996-06-18 | 1998-01-16 | Sony Corp | ディジタル信号の伝送方法、エンコーダ及びデコーダ |
JPH11355365A (ja) * | 1998-06-05 | 1999-12-24 | Hitachi Ltd | 非接触カードの通信方法及び該通信に用いる集積回路 |
Non-Patent Citations (1)
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See also references of EP1585280A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011526444A (ja) * | 2008-07-02 | 2011-10-06 | ゼットティーイー コーポレーション | データ転送方法 |
US8599939B2 (en) | 2008-07-02 | 2013-12-03 | Zte Corporation | Data transmission method |
JP2010074785A (ja) * | 2008-09-22 | 2010-04-02 | Yokosuka Telecom Research Park:Kk | 波形生成回路およびタグ通信装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1585280B1 (en) | 2013-03-13 |
US20100245051A1 (en) | 2010-09-30 |
EP1585280A1 (en) | 2005-10-12 |
JP3803364B2 (ja) | 2006-08-02 |
CN1698330A (zh) | 2005-11-16 |
US20050253716A1 (en) | 2005-11-17 |
EP1585280A4 (en) | 2011-09-21 |
CN1698330B (zh) | 2010-04-28 |
JPWO2004064346A1 (ja) | 2006-05-18 |
US7738838B2 (en) | 2010-06-15 |
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