WO2014192569A1 - 通信装置、通信システム、および通信方法 - Google Patents
通信装置、通信システム、および通信方法 Download PDFInfo
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- WO2014192569A1 WO2014192569A1 PCT/JP2014/063156 JP2014063156W WO2014192569A1 WO 2014192569 A1 WO2014192569 A1 WO 2014192569A1 JP 2014063156 W JP2014063156 W JP 2014063156W WO 2014192569 A1 WO2014192569 A1 WO 2014192569A1
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- 238000004891 communication Methods 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims description 18
- 230000008859 change Effects 0.000 claims description 60
- 238000012545 processing Methods 0.000 description 35
- 239000000872 buffer Substances 0.000 description 21
- 239000003990 capacitor Substances 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
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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
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
Definitions
- the present disclosure relates to a communication device, a communication system, and a communication method that perform short-range wireless communication.
- IC cards are used for tickets for transportation such as trains and buses, and electronic money.
- Such an IC card exchanges information with a reader / writer by short-range wireless communication (so-called non-contact communication).
- This communication is standardized by, for example, international standards ISO / IEC14443-2 (type A, type B) and international standards ISO / IEC18092. These standards stipulate that the reader / writer (initiator) and the IC card (target) communicate by ASK (AmplitudeAShift Keying) modulation.
- ASK AmplitudeAShift Keying
- Patent Document 1 discloses that demodulation is performed by quadrature detection (phase change demodulation mode) when applied to a reader / writer, and analog envelope detection or quadrature detection (amplitude change demodulation) when applied to an IC card.
- a demodulating circuit that demodulates in (mode) is disclosed.
- Patent Document 2 discloses a demodulator circuit for a reader / writer that includes an ASK detection circuit and a phase detection circuit, and uses an output signal of the ASK detection circuit and an output signal of the phase detection circuit having a larger average amplitude level. Is disclosed.
- the communication device includes a demodulation unit and a modulation unit.
- the demodulator performs amplitude change demodulation and phase change demodulation based on a modulation signal transmitted from another communication device, and selects a demodulated signal demodulated by one of them.
- the modulation unit modulates a magnetic field generated by another communication device.
- the communication system includes a first communication device and a second communication device.
- a first communication device that performs amplitude change demodulation and phase change demodulation based on the modulated signal transmitted from the second communication device, and that selects a demodulated signal demodulated by one of them;
- a modulation unit that modulates the magnetic field generated by the communication device 2.
- a communication method performs amplitude change demodulation and phase change demodulation based on a modulated signal transmitted from another communication device, and selects a demodulated signal demodulated by one of them.
- a signal is transmitted by receiving a signal and modulating a magnetic field generated by another communication device.
- amplitude change demodulation and phase change demodulation are performed based on a modulation signal transmitted from another communication device, and demodulated by any one of them.
- the demodulated signal is selected, the signal is received.
- Signals are transmitted by modulating magnetic fields generated by other communication devices.
- the amplitude change demodulation and the phase change demodulation are performed based on the modulation signal transmitted from the other communication device, and the demodulation is performed by any one of them. Since the signal is received by selecting the demodulated signal, and the signal is transmitted by modulating the magnetic field generated by another communication device, the communication quality can be improved.
- FIG. 2 is a block diagram illustrating a configuration example of a demodulator illustrated in FIG. 1. It is explanatory drawing showing the signal state in the communication system shown in FIG. It is explanatory drawing showing the other signal state in the communication system shown in FIG. It is explanatory drawing showing the other signal state in the communication system shown in FIG. It is a wave form diagram showing an example of the signal inputted into the modulation part concerning a modification. It is a block diagram showing the example of 1 structure of the demodulation part which concerns on a modification. It is explanatory drawing showing the other application example of a communication system.
- FIG. 1 illustrates a configuration example of a communication system 1 according to an embodiment.
- the communication system 1 is a communication system that exchanges information by short-range wireless communication (so-called non-contact communication). Note that the communication device and the communication method according to the embodiment of the present disclosure are embodied by the present embodiment, and will be described together.
- the communication system 1 includes a reader / writer 10 and an IC card 20.
- the reader / writer 10 and the IC card 20 exchange information by short-range wireless communication standardized by the international standard ISO / IEC18092. This standard is used for FeliCa (registered trademark), for example.
- the reader / writer 10 writes information to the IC card 20 or reads information from the IC card 20.
- the reader / writer 10 functions as a so-called initiator, and the IC card 20 functions as a so-called target. That is, the communication between the reader / writer 10 and the IC card 20 is such that the reader / writer 10 first communicates with the IC card 20 and the IC card 20 responds to the link, so that a link is formed. It has become.
- FIG. 2 shows an application example of the reader / writer 10.
- the reader / writer 10 is built in the cellular phone 9 in this example. Since such portable information terminals such as the mobile phone 9 are generally battery-driven, reduction of power consumption is strongly desired. As will be described later, the reader / writer 10 is configured to be mounted on such a portable information terminal by reducing power consumption during communication.
- the reader / writer 10 includes a processing unit 13, a modulation unit 11, a demodulation unit 12, an air-core coil 15, and capacitors 16 and 17.
- the processing unit 13 When transmitting a signal to the IC card 20, the processing unit 13 generates a signal Sig 1 and supplies the signal Sig 1 to the modulation unit 11. When receiving a signal from the IC card 20, the processing unit 13 is supplied from the demodulation unit 12. The predetermined processing is performed based on the received signal.
- FIG. 3 shows a waveform example of the signal Sig1 at the time of transmission.
- the signal Sig1 is composed of a preamble PA and a data packet DP.
- the preamble PA is arranged before the data packet DP, and is provided to synchronize communication.
- the preamble PA has a predetermined signal pattern that alternates. Specifically, the preamble PA is defined as an alternating pattern of 48 bits or more in the international standard ISO / IEC18092.
- the data packet DP corresponds to the main body of data to be transmitted.
- the modulation unit 11 performs ASK modulation processing based on the signal Sig1 when transmitting a signal to the IC card 20, and generates a transmission signal Smod1.
- the modulation unit 11 includes a control circuit 51, an oscillation circuit 52, and N buffers 53 (1) to 53 (N).
- the buffer 53 is used as appropriate to represent any one of the N buffers 53 (1) to 53 (N).
- the control circuit 51 determines the number of buffers 53 to be used among the N buffers 53 (1) to 53 (N), and enables output of the buffers 53 (1) to 53 (N).
- a control signal indicating whether or not to use the buffer 53 is supplied to the terminal OE.
- the modulation unit 11 dynamically changes the drive capability by changing the number of buffers 53 to be used, and performs ASK modulation.
- the oscillation circuit 52 generates a carrier wave signal Sc.
- the carrier wave signal Sc is, for example, a sine wave or a square wave, and its frequency is 13.56 MHz in this example.
- Each of the buffers 53 (1) to 53 (N) drives the load by outputting the carrier signal Sc supplied to the input terminal from the output terminal based on the control signal supplied to the output enable terminal OE. is there.
- the input terminals of the buffers 53 (1) to 53 (N) are connected to each other and to the oscillation circuit 52, and the carrier wave signal Sc is supplied.
- the output terminals of the buffers 53 (1) to 53 (N) are connected to each other and to one end of the capacitor 13.
- the output enable terminals OE of the buffers 53 (1) to 53 (N) are connected to the control circuit 51 and supplied with control signals, respectively.
- the modulation unit 11 generates the transmission signal Smod1 by modulating (ASK modulation) the amplitude of the carrier signal Sc based on the signal Sig1.
- the modulation unit 11 changes the amplitude of the transmission signal Smod1 according to the number of buffers 53 to be used. Specifically, the modulation unit 11 increases the amplitude of the transmission signal Smod1 by increasing the number of buffers 53 to be used, and reduces the amplitude of the transmission signal Smod1 by decreasing the number of buffers 53 to be used. Make it smaller. That is, the modulation unit 11 performs ASK modulation by dynamically changing the driving capability.
- the modulation unit 11 can suppress power consumption as compared with a case where the modulation unit is configured using a linear amplifier that receives the carrier signal Sc and changes the gain based on the signal Sig1.
- the reader / writer 10 can be mounted on a portable information terminal that has strong restrictions on power consumption.
- the demodulator 12 performs demodulation processing based on the signal received from the IC card 20.
- the air-core coil 15 functions as an antenna when communicating between the reader / writer 10 and the IC card 20.
- One end of the air-core coil 15 is connected to one end of the capacitor 16 and the other end of the capacitor 17, and the other end is grounded.
- One end of the capacitor 16 is connected to one end of the air-core coil 15 and the other end of the capacitor 17, and the other end is grounded.
- One end of the capacitor 17 is connected to the output terminals of the buffers 53 (1) to 53 (N) and to the input terminal of the demodulator 12, and the other end is one end of the capacitor 16 and one end of the air-core coil 15. Connected to.
- the air-core coil 15 and the capacitor 16 constitute a parallel resonance circuit
- the capacitor 17 AC-couples the parallel resonance circuit, the modulation unit 11 and the demodulation unit 12.
- the resonance frequency of the parallel resonance circuit is set to the frequency of the carrier signal Sc (13.56 MHz in this example).
- the IC card 20 includes a processing unit 27, an air-core coil 21, a capacitor 22, a resistance element 23, a switch 24, and a demodulation unit 25.
- the processing unit 27 When transmitting a signal to the reader / writer 10, the processing unit 27 generates a signal Sig2 and supplies it to the switch 24. When receiving a signal from the reader / writer 10, the processing unit 27 supplies the signal Sig2. Predetermined processing is performed based on the signal. At the time of transmission, the signal Sig2 is composed of a preamble PA and a data packet DP, like the signal Sig1 (FIG. 3).
- the air-core coil 21 functions as an antenna when communicating between the reader / writer 10 and the IC card 20.
- One end of the air-core coil 21 is connected to one end of the capacitor 22, is connected to one end of the resistance element 23 and the input terminal of the demodulator 25, and the other end is grounded.
- One end of the capacitor 22 is connected to one end of the air-core coil 21, and is connected to one end of the resistance element 23 and the input terminal of the demodulator 25, and the other end is grounded. That is, the capacitor 21 and the air-core coil 22 constitute a parallel resonance circuit.
- the resonance frequency of the parallel resonance circuit is set to the frequency of the carrier signal Sc (13.56 MHz in this example).
- the switch 24 is a switch that is turned on / off based on a signal Sig2 supplied from the processing unit 27, and has one end connected to the other end of the resistance element 23 and the other end grounded.
- the IC card 20 when the IC card 20 transmits a signal to the reader / writer 10, it can transmit the signal without actively generating a magnetic field by itself. That is, when data is transmitted from the IC card 20 to the reader / writer 10, the air-core coil 15 of the reader / writer 10 first generates a steady alternating magnetic field. Then, the switch 24 of the IC card 20 is turned on / off according to the signal Ssig2. As a result, signals corresponding to ON / OFF of the switch 24 of the IC card 20 are generated at both ends of the air-core coil 15 of the reader / writer 10. The demodulator 12 of the reader / writer 10 performs demodulation processing based on this signal.
- the air-core coil 15 of the reader / writer 10 when receiving a signal from the reader / writer 10, the air-core coil 15 of the reader / writer 10 generates an alternating magnetic field based on the signal Sig1. Thereby, an electromotive force corresponding to the alternating magnetic field is generated in the air-core coil 21 of the IC card 20.
- the demodulation unit 25 performs demodulation processing based on the received signal Smod2 corresponding to the electromotive force generated in the air-core coil 21.
- the configuration of the demodulation unit 25 will be described in detail.
- FIG. 4 shows a configuration example of the demodulator 25.
- the demodulator 25 includes an amplitude change demodulator 31, a phase change demodulator 32, A / D (Analog / Digital) converters 33 and 34, a preamble detector 35, a selector 36, and a digital demodulator 37. have.
- the amplitude change demodulator 31 performs a demodulation process based on the change of the amplitude component of the received signal Smod2.
- the phase change demodulator 32 performs a demodulation process based on a change in the phase component of the received signal Smod2.
- the A / D converter 33 performs A / D conversion on the demodulated signal supplied from the amplitude change demodulator 31 to generate a signal SA, and the A / D converter 34 supplies from the phase change demodulator 32.
- the demodulated signal is A / D converted to generate a signal SP.
- the preamble detector 35 detects the preamble PA based on the signal SA, detects the preamble PA based on the signal SB, and receives a control signal SEL indicating a signal from which the preamble PA is detected earlier of the signals SA and SB. Is to be generated. Based on the control signal SEL, the selection unit 36 selects and outputs a signal in which the preamble PA is detected first from the signals SA and SB.
- the digital demodulation unit 37 performs demodulation processing by digital signal processing based on the signal supplied from the selection unit 36.
- the IC card 20 corresponds to a specific example of “communication device” in the present disclosure.
- the reader / writer 10 corresponds to a specific example of “another communication apparatus” in the present disclosure.
- the preamble PA corresponds to a specific example of “header portion” in the present disclosure
- the data packet DP corresponds to a specific example of “data portion” in the present disclosure.
- the signal SA corresponds to a specific example of “first demodulated signal” in the present disclosure
- the signal SP corresponds to a specific example of “second demodulated signal” in the present disclosure.
- the modulation section 11 of the reader / writer 10 When transmitting a signal from the reader / writer 10 to the IC card 20, the modulation section 11 of the reader / writer 10 performs ASK modulation processing by dynamically changing the driving capability based on the signal Sig1, and generates a transmission signal Smod1. To do.
- the air-core coil 15 generates an alternating magnetic field according to the transmission signal Smod1.
- the air-core coil 26 of the IC card 20 generates an electromotive force according to this alternating magnetic field.
- the demodulator 25 performs a demodulation process based on the received signal Smod2 corresponding to the electromotive force generated in the air-core coil 26.
- the amplitude change demodulator 31 performs a demodulation process based on the change in the amplitude component of the received signal Smod2, and the A / D converter 33 performs A / D conversion on the output signal to obtain the signal SA. Is generated.
- the phase change demodulator 32 performs demodulation processing based on the change of the phase component of the received signal Smod2, and the A / D converter 34 A / D converts the output signal to generate the signal SP.
- the preamble detector 35 detects the preamble PA based on the signal SA, detects the preamble PA based on the signal SB, and receives a control signal SEL indicating a signal from which the preamble PA is detected earlier of the signals SA and SB. Generate.
- the selection unit 36 selects and outputs a signal in which the preamble PA is detected first among the signals SA and SB.
- the digital demodulator 37 performs demodulation processing by digital signal processing based on the signal selected by the selector 36.
- the air-core coil 15 of the reader / writer 10 When transmitting a signal from the IC card 20 to the reader / writer 10, first, the air-core coil 15 of the reader / writer 10 generates a stationary alternating magnetic field. Then, the switch 24 of the IC card 20 is turned on / off based on the signal Sig2. As a result, signals corresponding to ON / OFF of the switch 24 of the IC card 20 are generated at both ends of the air-core coil 15 of the reader / writer 10. The demodulator 12 of the reader / writer 10 performs demodulation processing based on this signal.
- the modulation unit 11 of the reader / writer 10 dynamically changes the driving capability by changing the number of buffers 53 to be used based on the signal Sig1, ASK modulation processing is performed.
- the received signal Smod2 may be a signal different from a general ASK modulated wave depending on the distance d between the reader / writer 10 and the IC card 20.
- FIG. 5A to 5C show constellation plots.
- FIG. 5A shows a case where the distance d is large
- FIG. 5B shows a case where the distance d is medium
- FIG. 5C shows a case where the distance d is short.
- the horizontal axis represents the in-phase component I
- the vertical axis represents the quadrature component Q.
- signal state A shows a case where the number of buffers 53 used is increased
- signal state B shows a case where the number of buffers 53 used is reduced.
- the signal states A and B are on the axis of the in-phase component I, and the signal state A has a larger amplitude than the signal state B. State. That is, in the transition between the signal states A and B, the phase hardly changes and only the amplitude changes.
- the signal state B is slightly separated from the axis of the in-phase component I in this example, as shown in FIG. 5B.
- the signal state B is further away from the axis of the in-phase component I in this example, as shown in FIG. 5C. Thereby, in the transition between the signal states A and B, the phase change becomes more dominant than the amplitude change.
- the received signal Smod2 may be a signal that is close to a PSK modulated wave rather than an ASK modulated wave.
- the demodulator when the demodulator is configured using only the amplitude change demodulator 31, when the distance d is large (for example, FIG. 5A), the signal states A and B are identified. However, when the distance d is small (for example, FIG. 5C), it is difficult to identify the signal states A and B, which may reduce the communication error rate.
- the demodulator 25 is configured by using both the amplitude change demodulator 31 and the phase change demodulator 32, and the signal SA and the phase change demodulator output from the amplitude change demodulator 31 depending on the communication state. Since an appropriate signal is selected from the signals SB output from the unit 32, the communication quality can be improved even if the distance d changes.
- the preamble detector 35 detects the preamble PA in the signal SA prior to the signal SP, and the selector 36 selects the signal SA. Then, the digital demodulator 37 performs a demodulation process based on the signal SA.
- the phase change is dominant, and therefore it is easy to detect the preamble PA in the signal SP output from the phase change demodulator 32, but the amplitude change demodulator 31. It is difficult to detect the preamble PA in the signal SA output from. Therefore, the preamble detector 35 detects the preamble PA in the signal SP before the signal SA, and the selector 36 selects the signal SP. Then, the digital demodulator 37 performs demodulation processing based on the signal SP.
- the modulation unit 11 of the reader / writer 10 performs the ASK modulation process by dynamically changing the driving capability
- the demodulation unit 25 of the IC card 20 performs the signal SA and the phase output from the amplitude change demodulation unit 31.
- the demodulation process is performed based on the signal in which the preamble PA is detected first.
- the demodulator of the IC card is provided with the amplitude change demodulator and the phase change demodulator, and the output signal of the amplitude change demodulator and the output signal of the phase change demodulator Since demodulation processing is performed based on the signal in which the preamble is detected, the possibility that the communication error rate may decrease can be reduced regardless of the distance between the reader / writer and the IC card. Can be increased.
- the modulation unit of the reader / writer is configured to dynamically change the driving capability and perform the ASK modulation process by changing the number of buffers to be used, thereby reducing power consumption. Therefore, it can be mounted on a portable information terminal or the like for which reduction of power consumption is strongly desired.
- the reader / writer 10 and the IC card 20 are used for short-range wireless communication standardized by the international standard ISO / IEC18092.
- the present invention is not limited to this, and instead, For example, it may be used for short-range wireless communication standardized by the international standard ISO / IEC14443-2 (for example, type B).
- the communication system 1A according to the present modification will be described in detail. As shown in FIG. 1, the communication system 1A includes a reader / writer 10A and an IC card 20A.
- the reader / writer 10A includes a processing unit 13A and a demodulation unit 12A.
- the processing unit 13A performs processing related to communication according to the international standard, and has the same function as the processing unit 13 according to the embodiment.
- the processing unit 13A When transmitting a signal to the IC card 20A, the processing unit 13A generates a signal Sig1A and supplies the signal Sig1A to the modulation unit 11.
- the demodulation unit 12A performs demodulation processing based on the signal received from the IC card 20A.
- FIG. 6 shows a waveform example of the signal Sig1A in the reader / writer 10A.
- the signal Sig1A includes an SOF (Start (Of Frame) portion D1, a data portion D2, and an EOF (End Of Frame) portion D3.
- the SOF part D1 is arranged in front of the data part D2, which is the main body of data to be transmitted, and the EOF part D3 is arranged behind this data part D2.
- the SOF portion D1 has a predetermined signal waveform.
- the SOF portion D1 is maintained at a low level for a period P1 of 10 [etu] or more and 11 [etu] or less in the international standard ISO / IEC144443-2, and then 2 [etu] or more and 3 [etu] or less. It is determined that the waveform is maintained at a high level only during the period P2.
- etu (element time unit) is a signal width in the data portion D2, as shown in FIG.
- the IC card 20A includes a processing unit 27A and a demodulation unit 25A.
- the processing unit 27A performs processing related to communication according to the international standard, and has the same function as the processing unit 27 according to the embodiment.
- the processing unit 27A generates a signal Sig2A and supplies it to the switch 24 when transmitting a signal to the reader / writer 10A.
- This signal Sig2A is obtained by subjecting a subcarrier having a frequency of 1/16 of the carrier signal Sc to BPSK (Binary Phase Shift Shift Keying) modulation with a signal similar to the signal Sig1A (FIG. 6).
- FIG. 7 shows a configuration example of the demodulator 25A.
- the demodulator 25A has an SOF detector 35A.
- the SOF detection unit 35A detects the SOF part D1 based on the signal SA, detects the SOF part D1 based on the signal SB, and indicates a signal indicating the signal in which the SOF part D1 is detected earlier of the signals SA and SB.
- a signal SEL is generated. Based on the control signal SEL, the selection unit 36 selects and outputs the signal in which the SOF portion D1 is detected first among the signals SA and SB.
- the SOF part D1 corresponds to a specific example of “header part” in the present disclosure
- the data part D2 corresponds to a specific example of “data part” in the present disclosure.
- the demodulation unit 25 is applied to the IC card 20, but the present invention is not limited to this. Instead, for example, as shown in FIG. It may be applied to other portable information terminals or the like. That is, the target with which the initiator communicates is not limited to the IC card 20.
- the demodulator 25 is applied to the IC card 20 side, but the present invention is not limited to this.
- the demodulator 12 is also applied to the reader / writer 10 side. A similar configuration may be used.
- the present invention is applied to a system that performs communication by ASK modulation related to a digital signal.
- the present invention is not limited to this, and any system that performs communication by amplitude modulation may be used. It may be a thing.
- the present invention can be applied to a system that performs communication by AM modulation related to an analog signal.
- a demodulator that performs amplitude change demodulation and phase change demodulation based on a modulated signal transmitted from another communication device, and selects a demodulated signal demodulated by one of them;
- a communication device comprising: a modulation unit that modulates a magnetic field generated by the other communication device.
- the modulated signal has a data portion and a header portion preceding the data portion;
- the demodulation unit is configured to perform the first demodulation based on a portion corresponding to the header portion in the first demodulation signal demodulated by the amplitude change demodulation and the second demodulation signal demodulated by the phase change demodulation.
- the communication apparatus according to (1), wherein one of the signal and the second demodulated signal is selected.
- the short-range wireless communication is standardized in ISO / IEC18092, The communication device according to (4), wherein the header portion is a preamble.
- the short-range wireless communication is standardized in ISO / IEC 14443-2, The communication device according to (4), wherein the header portion is a start of frame.
- the modulation unit includes: Coils, A resistance element;
- the communication device according to any one of (1) to (7), further including a switch that turns on and off both ends of the coil via the resistance element.
- the first communication device is: A demodulator that performs amplitude change demodulation and phase change demodulation based on the modulated signal transmitted from the second communication device, and selects a demodulated signal demodulated by one of them; A modulation unit that modulates a magnetic field generated by the second communication device.
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Abstract
Description
図1は、実施の形態に係る通信システム1の一構成例を表すものである。通信システム1は、近距離無線通信(いわゆる非接触通信)により情報のやりとりを行う通信システムである。なお、本開示の実施の形態に係る通信装置および通信方法は、本実施の形態により具現化されるので、併せて説明する。通信システム1は、リーダライタ10と、ICカード20とを備えている。
リーダライタ10は、処理部13と、変調部11と、復調部12と、空芯コイル15と、コンデンサ16,17とを有している。
ICカード20は、処理部27と、空芯コイル21と、コンデンサ22と、抵抗素子23と、スイッチ24と、復調部25とを有している。
続いて、本実施の形態の通信システム1の動作および作用について説明する。
まず、図1,4を参照して、通信システム1の全体動作概要を説明する。リーダライタ10からICカード20に信号を送信する際、リーダライタ10の変調部11は、信号Sig1に基づいて、駆動能力を動的に変化させることによりASK変調処理を行い、送信信号Smod1を生成する。そして、空芯コイル15は、この送信信号Smod1に応じた交番磁界を発生させる。ICカード20の空芯コイル26は、この交番磁界に応じた起電力を発生させる。復調部25は、空芯コイル26に発生した起電力に応じた受信信号Smod2に基づいて復調処理を行う。具体的には、振幅変化復調部31は、受信信号Smod2のうちの振幅成分の変化に基づいて復調処理を行い、A/D変換部33は、その出力信号をA/D変換して信号SAを生成する。位相変化復調部32は、受信信号Smod2のうちの位相成分の変化に基づいて復調処理を行い、A/D変換部34は、その出力信号をA/D変換して信号SPを生成する。プリアンブル検出部35は、信号SAに基づいてプリアンブルPAを検出するとともに、信号SBに基づいてプリアンブルPAを検出し、信号SA,SBのうちの先にプリアンブルPAを検出した信号を示す制御信号SELを生成する。選択部36は、制御信号SELに基づいて、信号SA,SBのうちの先にプリアンブルPAを検出した信号を選択して出力する。デジタル復調部37は、選択部36において選択された信号に基づいてデジタル信号処理により復調処理を行う。
リーダライタ10からICカード20に信号を送信する際、リーダライタ10の変調部11は、信号Sig1に基づいて、使用するバッファ53の数を変化させることにより、駆動能力を動的に変化させ、ASK変調処理を行う。これにより、ICカード20が信号を受信する際、その受信信号Smod2は、リーダライタ10とICカード20との間の距離dにより、一般的なASK変調波とは異なる信号になる場合がある。
以上のように本実施の形態では、ICカードの復調部に振幅変化復調部と位相変化復調部とを設け、振幅変化復調部の出力信号と位相変化復調部の出力信号のうちの、先にプリアンブルが検出された信号に基づいて復調処理を行うようにしたので、リーダライタとICカードとの間の距離にかかわらず、通信の誤り率が低下するおそれを低減することができ、通信の品質を高めることができる。
上記実施の形態では、リーダライタ10およびICカード20は、国際規格ISO/IEC18092により規格化された近距離無線通信に用いるものとしたが、これに限定されるものではなく、これに代えて、例えば、国際規格ISO/IEC14443-2(例えばタイプB)により規格化された近距離無線通信に用いてもよい。以下に、本変形例に係る通信システム1Aついて詳細に説明する。通信システム1Aは、図1に示したように、リーダライタ10Aと、ICカード20Aとを備えている。
前記他の通信装置が生成した磁界を変調する変調部と
を備えた通信装置。
前記復調部は、前記振幅変化復調により復調された第1の復調信号、および前記位相変化復調により復調された第2の復調信号における前記ヘッダ部分に対応する部分に基づいて、前記第1の復調信号および前記第2の復調信号のうちの一方を選択する
前記(1)に記載の通信装置。
前記(2)に記載の通信装置。
前記(2)または(3)に記載の通信装置。
前記ヘッダ部分はプリアンブルである
前記(4)に記載の通信装置。
前記ヘッダ部分はスタートオブフレームである
前記(4)に記載の通信装置。
前記(1)から(6)のいずれかに記載の通信装置。
コイルと、
抵抗素子と、
前記コイルの両端を、前記抵抗素子を介してオンオフするスイッチと
を有する
前記(1)から(7)のいずれかに記載の通信装置。
前記(1)から(8)のいずれかに記載の通信装置。
前記(1)から(8)のいずれかに記載の通信装置。
第2の通信装置と
を備え、
前記第1の通信装置は、
前記第2の通信装置から送信された変調信号に基づいて振幅変化復調および位相変化復調を行い、それらのいずれか一方により復調された復調信号を選択する復調部と、
前記第2の通信装置が生成した磁界を変調する変調部と
を有する
通信システム。
前記他の通信装置が生成した磁界を変調することにより、信号を送信する
通信方法。
Claims (12)
- 他の通信装置から送信された変調信号に基づいて振幅変化復調および位相変化復調を行い、それらのいずれか一方により復調された復調信号を選択する復調部と、
前記他の通信装置が生成した磁界を変調する変調部と
を備えた通信装置。 - 前記変調信号は、データ部分と、そのデータ部分に先立つヘッダ部分とを有し、
前記復調部は、前記振幅変化復調により復調された第1の復調信号、および前記位相変化復調により復調された第2の復調信号における前記ヘッダ部分に対応する部分に基づいて、前記第1の復調信号および前記第2の復調信号のうちの一方を選択する
請求項1に記載の通信装置。 - 前記復調部は、前記第1の復調信号および前記第2の復調信号のうちの、先に前記ヘッダ部分が検出された復調信号を選択して出力する
請求項2に記載の通信装置。 - 前記通信装置は、前記他の通信装置との間で近距離無線通信により通信を行う
請求項2に記載の通信装置。 - 前記近距離無線通信は、ISO/IEC18092において規格化されたものであり、
前記ヘッダ部分はプリアンブルである
請求項4に記載の通信装置。 - 前記近距離無線通信は、ISO/IEC14443-2において規格化されたものであり、
前記ヘッダ部分はスタートオブフレームである
請求項4に記載の通信装置。 - 前記変調信号は、ASK変調信号である
請求項1に記載の通信装置。 - 前記変調部は、
コイルと、
抵抗素子と、
前記コイルの両端を、前記抵抗素子を介してオンオフするスイッチと
を有する
請求項1に記載の通信装置。 - 前記通信装置はICカードである
請求項1に記載の通信装置。 - 前記通信装置は携帯型情報端末である
請求項1に記載の通信装置。 - 第1の通信装置と、
第2の通信装置と
を備え、
前記第1の通信装置は、
前記第2の通信装置から送信された変調信号に基づいて振幅変化復調および位相変化復調を行い、それらのいずれか一方により復調された復調信号を選択する復調部と、
前記第2の通信装置が生成した磁界を変調する変調部と
を有する
通信システム。 - 他の通信装置から送信された変調信号に基づいて振幅変化復調および位相変化復調を行い、それらのいずれか一方により復調された復調信号を選択することにより信号を受信し、
前記他の通信装置が生成した磁界を変調することにより、信号を送信する
通信方法。
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