WO2005031997A1 - 情報処理装置、無線通信システム及び無線通信方法 - Google Patents
情報処理装置、無線通信システム及び無線通信方法 Download PDFInfo
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- WO2005031997A1 WO2005031997A1 PCT/JP2004/014692 JP2004014692W WO2005031997A1 WO 2005031997 A1 WO2005031997 A1 WO 2005031997A1 JP 2004014692 W JP2004014692 W JP 2004014692W WO 2005031997 A1 WO2005031997 A1 WO 2005031997A1
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- carrier signal
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- 238000004891 communication Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000010365 information processing Effects 0.000 title claims abstract description 27
- 230000004044 response Effects 0.000 claims abstract description 130
- 230000001360 synchronised effect Effects 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims description 86
- 238000001514 detection method Methods 0.000 claims description 37
- 238000012545 processing Methods 0.000 claims description 19
- 230000006870 function Effects 0.000 claims description 9
- 239000002131 composite material Substances 0.000 abstract description 99
- 238000010586 diagram Methods 0.000 description 13
- 230000010363 phase shift Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 241000699670 Mus sp. Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
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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
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
-
- 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
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
-
- 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
-
- 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
- G06K7/10366—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 the interrogation device being adapted for miscellaneous applications
- G06K7/10376—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 the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable
Definitions
- the present invention relates to a system for reading an electronic price tag attached to tableware at a restaurant or a product at a store, a system for reading an electronic tag attached to an article distributed on an article distribution base, etc.
- TECHNICAL FIELD The present invention relates to an information processing device, a wireless communication system, and a wireless communication method suitable for application to a guidance sign reading system for guiding a vehicle. More specifically, an information processing apparatus that wirelessly communicates predetermined data using a backscatter communication method includes a carrier compensation circuit in a signal processing unit.
- the carrier compensation circuit compares the phase of the carrier signal at the time of transmission with the phase of the carrier signal constituting the response signal at the time of reception, and compares the carrier signal that is not synchronized with the phase of the carrier signal at the time of transmission with the comparison result. Remove based on In this way, the present invention can compensate for the data modulation component of the response signal transmitted from the signal responder and improve the SZN ratio of the response signal returned from the signal responder. Things. Background art
- a tag reader system has been devised to apply this kind of wireless communication technology.
- This tag reader system wirelessly communicates predetermined data using a back-scattering (back-scattering) method. For example, it is applied to a system that reads an electronic price tag attached to tableware at a restaurant. You.
- back-scattering back-scattering
- the tag 'reader system 1 shown in Fig. 1 includes a tag 10 and a tag reader 20', and transmits a carrier signal of a predetermined frequency from the tag reader 20 'to the tag 10 continuously. It receives the amplitude-modulated signal scattered (returned) from and attempts to obtain data specific to the tag.
- tag 10 is a carrier signal (interrogation signal) with a frequency of 2.45 GHz. Is received, the carrier signal is amplitude-modulated with unique data, for example, and a tag amplitude-modulated signal after amplitude modulation (hereinafter simply referred to as a response signal S f (D)) is transmitted.
- the tag 10 is attached to an identification object 9 such as tableware in a restaurant, for example.
- the tag 10 includes a receiving antenna 1A, a transmitting antenna 1B, an amplitude modulator 2, a memory 3, a clock oscillator 4, and a power supply 5. Although the antennas 1A and 1B are described in two parts for the sake of explanation of the operation, they are actually composed of one antenna.
- the antenna 1A receives the carrier wave signal Sf serving as an interrogation signal in the tag / reader system 1.
- the antennas 1A and 1B loop antennas in which conductors are wound in a coil shape are used.
- a power supply unit 5 is connected to the antenna units 1A and 1B, and supplies the induced power based on the carrier signal Sf received by the antenna unit 1A to the amplitude modulation unit 2, the memory unit 3, and the clock oscillator 4. Works as follows.
- DATA data specific to the object to be identified, such as the price of a dish served on tableware
- CLK clock signal
- a read-only memory (ROM) is used for the memory unit 3.
- a clock oscillator 4 is connected to the memory unit 3 and operates so as to oscillate a clock signal of a predetermined frequency and output the clock signal to the memory unit 3.
- the amplitude modulating section 2 modulates the amplitude of the carrier signal S f based on the data read from the memory section 3.
- An antenna 1B is connected to the amplitude modulator 2, and transmits a response signal S f (D) after the amplitude modulation.
- the tag / reader system 1 includes a tag / reader 20 'in addition to the tag 10 described above.
- the tag reader 20 ′ operates so as to transmit the carrier signal S f to the tag 10 and to receive the response signal S f (D) returned from the tag 10 and perform signal processing.
- the unmodulated carrier composite signal S f which is reflected and returned from the surrounding object, is also received by the antenna 13B. That is, the response combined signal S in including the response signal S f (D) and the carrier combined signal S f ′ is received.
- the main parts of the tag reader 20 include an oscillator 11, a transmitting unit 12, a transmitting antenna 13 A, a receiving antenna 13 B, a receiving unit 14, and the like. Yes. Although the antenna bodies 13A and 13B are described in two parts for explanation of operation, they are actually composed of one antenna body.
- the oscillator 11 generates a carrier signal S f of 2.45 GHz.
- the transmitting antenna 13A radiates the amplified carrier signal Sf.
- the receiving unit 14 operates to receive the response signal Sin at the time of reception and perform data demodulation processing.
- the receiving unit 14 has a demodulation circuit 40 and a data reading unit 50.
- the demodulation circuit 40 is connected to the antenna body 13B, demodulates the response signal S f (D) based on the carrier signal S f, and outputs tag-specific data (DATA).
- a data reading unit 50 is connected to the demodulation circuit 40, and the data reading unit 50 operates to read the tag-specific data and output the data to the output terminal 60.
- the monitor 16 shown in FIG. 2 is connected to the output terminal 60 through a control device (not shown). The monitor 16 displays the tag-specific data read by the data reading section 50.
- problems of the tag / reader system 1 will be described.
- the tag / reader main body 101 is provided with a monitor 16, a read operation button 171, and the like.
- the amplified carrier signal Sout S f is output from the antenna 13A shown in Fig. 1.
- the signal is radiated and the carrier signal S f is transmitted to the tag 10 on the path I.
- the carrier signal S f transmitted to the tag 10 reflects the object 90 on the route II, and the reflected carrier signal S f 'is received by the tag reader 20'. Is done.
- the tag 10 amplitude-modulates the carrier signal S f by the path I based on the data.
- the tag / reader main body 101 receives the response combined signal Sin returned from the tag 10 and performs signal processing.
- the response signal S f (D) based on the carrier signal S f returning from the tag 10 in the path III and the unmodulated carrier signal S f ′ reflected back from the object 90 in the path II respond. It is included in the composite signal Sin and is received by the antenna 13B shown in FIG. In this way, objects 9 When 0 is present, the carrier composite signal S f, returned from the surrounding object 90, causes noise.
- Japanese Patent Application Laid-Open No. Hei 11-239798 describes a modulated back-skiuttering wireless communication system.
- an interrogator and a remote tag are provided, and the interrogator transmits an interrogation signal of a predetermined frequency to the remote tag.
- a narrowband downlink signal is used as the interrogation signal.
- the remote tag performs amplitude modulation, receives a response signal converted into a wideband uplink signal after the amplitude modulation by an interrogator, and processes the signal.
- an MBS Modulation Back Scattering
- a background noise reduction device in relation to a method of reducing background noise in this type of system, includes a demodulator, a frame power measurement circuit, a linear prediction analysis circuit, an inverse filtering circuit, and a subtractor.
- the frame power measurement circuit inputs the demodulated audio signal (hereinafter referred to as demodulated signal) from the demodulator, obtains the power level for each frame, and compares it with a predetermined threshold. As a result of this comparison, if the power level is below the threshold, the linear prediction analysis circuit inputs the demodulated signal and performs linear prediction analysis to obtain a linear prediction coefficient.
- the inverse filtering circuit performs an inverse filtering process on the demodulated signal based on the linear prediction coefficient to obtain a pre-IJ value.
- the subtractor subtracts the predicted value from the input demodulated signal. In this way, only the background noise level can be reduced to a predetermined value or less, and the listener can comfortably use the speech power S while using the background noise as part of the information.
- the carrier composite signal S f which is reflected back from the object 90, is a noise source.
- the SZN ratio of the response signal from the tag 10 may decrease.
- An information processing apparatus is an apparatus that transmits a carrier signal of a predetermined frequency to a signal transponder of a backscattering communication system, and receives and processes a response signal obtained by modulating the carrier signal with predetermined data from the signal transponder. It is.
- This device includes a transmitting unit that transmits a carrier signal to a signal transponder, and a signal processing unit that receives and processes a response signal scattered from the signal transponder.
- the signal processing unit is provided with a carrier compensation circuit.
- the carrier compensation circuit compares the phase of the carrier signal at the time of transmission with the phase of the carrier signal at the time of reception.
- the carrier wave that is not synchronized with the phase of the carrier signal at the time of transmission is provided. The signal is removed based on the comparison result.
- a carrier signal of a predetermined frequency is transmitted to a signal transponder of the backscatter communication system, and a response signal obtained by modulating the carrier signal with predetermined data is received from the signal transponder and processed.
- the transmitting unit transmits the carrier signal to the signal transponder.
- the signal processing unit receives and processes the response signal scattered from the signal responder. Based on this assumption, the carrier compensation circuit provided in the signal processing unit compares the phase of the carrier signal at the time of transmission with the phase of the carrier signal at the time of transmission, and the carrier wave that is not synchronized with the phase of the carrier signal at the time of transmission The signal is removed based on the comparison result.
- the phase synchronization detection unit compares the phase of the carrier signal during transmission with the phase of the carrier signal during reception, and detects a carrier signal that is not synchronized with the phase of the carrier signal during transmission.
- the amplitude controller is a carrier signal at the time of transmission detected by the phase synchronization detector. Of the carrier signal not synchronized with the phase of.
- the amplitude adjustment circuit adjusts the amplitude of the carrier signal that is not synchronized with the phase of the carrier signal at the time of transmission detected by the phase synchronization detector.
- the arithmetic circuit operates to subtract the carrier signal whose amplitude has been adjusted by the amplitude adjusting circuit from the carrier signal at the time of reception.
- the data modulation component of the response signal transmitted from the signal transponder can be compensated so as to remove the carrier signal reflected from the surrounding object, and the SZN of the response signal scattered from the ft The ratio can be improved. This makes it possible to demodulate highly reliable data that is not affected by interference noise due to a carrier signal reflected from a surrounding object.
- a wireless communication system is a system for performing wireless communication of predetermined data by a backscatter communication method.
- This system receives a carrier signal of a predetermined frequency, modulates the carrier signal with data and transmits a response signal, and transmits the carrier signal to the signal responder and scatters from the signal responder.
- An information processing device having a wireless transmission / reception function for receiving the response signal and performing information processing. This information processing device compares the phase of a carrier signal at the time of transmission with the phase of a carrier signal at the time of reception, and removes a carrier signal that is not synchronized with the phase of the carrier signal at the time of transmission based on the comparison result. Circuit.
- the information processing device of the present invention is applied when predetermined data is wirelessly communicated by the backscatter communication method.
- a signal transponder that receives a carrier signal of a predetermined frequency, modulates the carrier signal with data, and transmits a response signal is attached to, for example, an object to be identified.
- a carrier signal is transmitted from the information processing device having the wireless transmission / reception function to the signal transponder, and the information processing device receives the response signal scattered from the signal transponder and performs signal processing.
- the carrier compensation circuit provided in the information processing apparatus compares the phase of the carrier signal at the time of transmission with the phase of the carrier signal at the time of transmission, and compares the phase of the carrier signal that is not synchronized with the phase of the carrier signal at the time of transmission. The signal is removed based on the comparison result.
- a wireless communication method is characterized in that a signal transponder that receives a carrier signal of a predetermined frequency, modulates the carrier signal with predetermined data and transmits a response signal is attached to the object to be identified, and attached to the object to be identified.
- the present invention relates to a radio communication method of a backscatter communication system for transmitting a carrier signal to a signal responder and receiving a response signal scattered from the signal responder and performing signal processing.
- the phase of the carrier signal at the time of transmission is compared with the phase of the carrier signal at the time of reception, and a carrier signal that is not synchronized with the phase of the carrier signal at the time of transmission is removed based on the comparison result.
- the data modulation component of the response signal transmitted from the signal responder can be compensated.
- the SZN ratio of the response signal obtained can be improved. Therefore, it is possible to demodulate highly reliable data that is not affected by interference noise due to an unmodulated carrier signal reflected from a surrounding object.
- FIG. 1 is a conceptual diagram showing a configuration example of a tag / reader system 1 as a conventional example.
- FIG. 2 is a conceptual diagram illustrating a problem of the tag reader system 1.
- FIG. 3 is a perspective view showing a configuration example of a tag reader system 100 with a carrier wave compensation function as an embodiment according to the present invention.
- FIG. 4 is a block diagram showing an example of the internal configuration of the tag 'reader system 100.
- FIG. 5A is a vector diagram showing an operation example of the carrier signal S f handled by the carrier compensation circuit 30.
- FIG. 5B is a betattle diagram showing an operation example of the response signal S f (D) handled by the carrier compensation circuit 30.
- Figure 5C shows an example of the operation of the carrier composite signal S f ′ handled by the carrier compensation circuit 30. It is a vector diagram.
- FIG. 6 is a block diagram showing an example of the internal configuration of the carrier compensation circuit 30.
- FIG. 7A is a diagram illustrating a waveform example of the carrier signal S f.
- FIG. 7B is a diagram showing a waveform example of the carrier signal A u having a phase shift.
- FIG. 7C is a diagram showing a waveform example of the carrier signal Ad in which a phase shift has occurred.
- FIG. 8A is a diagram showing a waveform example of tag-specific data in the tag / reader system 100.
- FIG. 8A is a diagram showing a waveform example of tag-specific data in the tag / reader system 100.
- FIG. 8B is a diagram illustrating a waveform example of a response signal S f (D) amplitude-modulated based on the carrier signal S f.
- FIG. 8C is a diagram illustrating a waveform example of the response combined signal S in at the time of reception, in which the response signal S f (D) and the carrier composite signal S f ′ are superimposed and drawn for convenience.
- the present invention has been made to solve the conventional problem, and enables to compensate a data modulation component of a response signal transmitted from a signal transponder when predetermined data is wirelessly communicated by a backscatter communication method. It is another object of the present invention to provide an information processing apparatus, a wireless communication system, and a wireless communication method capable of improving the SZN ratio of a response signal returned from a signal transponder.
- an information processing apparatus having a wireless transmission / reception function is provided with a carrier compensation circuit, and the phase of the carrier signal at the time of transmission and the composite wave at the time of reception Is compared with the phase of the carrier signal, and the carrier signal of the composite wave that is not synchronized with the phase of the carrier signal at the time of transmission is removed based on the comparison result and transmitted from the signal responder.
- the data modulation component of the response signal can be compensated, and the SZN ratio of the response signal returned from the signal responder can be improved.
- the tag / reader system 100 with a carrier compensation function shown in FIG. 3 is an example of a wireless communication system.
- G This is a system that performs wireless communication using the system.
- This system 100 is a system that reads an electronic price tag attached to tableware at a restaurant or a product at a store, an electronic tag attached to an article distributed on an article distribution base, etc. It is suitable to be applied to a guidance sign reading system or the like for guiding walking.
- the tag / reader system 100 has a tag 10 as an example of a signal responder and a tag / reader 20 with a wireless transmission / reception function as an example of an information processing device.
- the tag 'reader 20 is provided with an antenna body 13, a monitor 16 and a read operation button 17 on the reader body.
- a carrier signal (interrogation signal) S f of a predetermined frequency, for example, 2.45 GHz is radiated from the antenna body 13 to the tag 10.
- the carrier signal S f is indicated by a dashed line.
- the tag 10 receives the carrier signal S f, performs a predetermined modulation process on the carrier signal S f using unique data, and modulates the tag signal (hereinafter simply referred to as a response signal S f (D) with the tag modulated signal. Work) to spread (transmit).
- the response signal S f (D) is indicated by a dashed line. What is actually received by the antenna 13 is not only the response signal S f (D), but also a carrier signal S f ′ reflected from a surrounding object.
- the tag 10 is used by being attached to a predetermined object 9 to be identified.
- the tag 10 is used as an electronic price tag or an electronic tag, and is attached to an identification object 9 such as tableware in a restaurant or a product in a store.
- the tag 10 includes an IC chip 10 ′ and a loop-shaped antenna 1.
- the IC chip 10 'and the antenna body 1 are integrally formed into a flat plate (made into a module) with resin or the like, and attached to each tableware or product.
- the antenna 1 of the tag 10 and the antenna 13 of the tag 20 shown in FIG. 3 are composed of the transmitting and receiving antennas 1A and 1A for clearly explaining the principle of the tag reader. IB and 13 A and 13 B are expanded and described respectively.
- the tag 10 receives a carrier signal Sf of a predetermined frequency, and modulates the carrier signal Sf with unique data (DATA), for example, by amplitude modulation.
- DATA unique data
- the tag 10 has a receiving antenna 1A, a transmitting antenna 1B, an amplitude modulation unit 2, a memory unit 3, a clock oscillator 4, and a power supply unit 5.
- the amplitude modulation section 2, the memory section 3, the clock oscillator 4 and the power supply section 5 are integrated into a semiconductor integrated circuit to constitute an IC chip 10 '.
- the antenna 1A receives the carrier signal S f serving as an interrogation signal in the tag / reader system 100.
- loop antennas in which conductors are wound in a coil shape are used for the antenna bodies 1A and 1B.
- a power supply unit 5 (also simply referred to as a power supply unit) is connected to the antenna units 1A and IB, and the induced power based on the carrier signal Sf received by the antenna unit 1A is modulated by the amplitude modulation unit 2 and the memory unit. 3 and clock oscillator 4.
- the memory unit 3 stores, for example, the price of dishes served on tableware and data (code data, etc .; data) unique to the identified object added to clothing, home appliances, and the like. (CLK) and operates so that the data is output to the amplitude modulation unit 2.
- the memory section 3 uses a read only memory (ROM) or an electrically programmable read only memory (EE PROM).
- a clock oscillator 4 is connected to the memory unit 3, and operates so as to oscillate a clock signal of a predetermined frequency and output the clock signal to the memory unit 3.
- the amplitude modulating section 2 modulates the amplitude of the carrier signal S f based on the data read from the memory section 3.
- the carrier signal S f amplitude-modulated with the data is the response signal S f (D).
- An antenna 1B is connected to the amplitude modulator 2, and operates so as to scatter (transmit) the response signal S f (D) after the amplitude modulation.
- the tag / reader system 100 includes a tag / reader 20 with a wireless transmission / reception function, which is an example of an information processing device, in addition to the tag 10 described above.
- the tag reader 20 operates to transmit the carrier signal S f to the tag 10 and receive the response signal S f (D) scattered from the tag 10 and perform signal processing.
- the reader 20 is composed of an oscillator 11, a transmission section 12, a transmission antenna 13 A, a reception antenna 13 B, a reception section 14, a control device 15, an operation section 16, and a monitor 17.
- Power supply unit 18 is provided.
- a transmitting unit 12 is connected to the oscillator 11 to amplify the carrier signal Sf based on the output permission signal S1 from the control device 15 and transmit the amplified carrier signal Sf to a transmitting antenna. Output to 13 A. For example, the transmission permission is enabled at the high level and the transmission permission is disabled at the low level.
- the transmitting antenna 13A radiates the amplified carrier signal Sf.
- the receiving unit 14 operates to receive the response combined signal S in at the time of reception and perform data demodulation processing.
- the response synthetic signal S in at the time of reception includes the unmodulated carrier signal S f ′ reflected from surrounding objects and the response signal S f (D) from the tag 10.
- the receiving unit 14 includes, for example, a carrier compensation circuit 30, a demodulation circuit 40, and a data reading unit 50.
- the carrier compensation circuit 30 has a function of compensating for a data modulation component by erasing the unmodulated carrier composite signal S f ′ that reflects an object other than a tag.
- the carrier compensation circuit 30 compares the phase of the carrier signal S f at the time of transmission with the phase of the response combined signal S in which is an example of the carrier signal at the time of reception, and outputs the carrier signal at the time of transmission. It operates to remove the carrier composite signal S f ′ that is not synchronized with the phase of S f based on the comparison result.
- An example of the internal configuration of the carrier wave compensation circuit 30 will be described with reference to FIGS. 5A to 5C.
- a demodulation circuit 40 is connected to the carrier compensation circuit 30.
- the demodulation circuit 40 demodulates the response signal S f (D) based on the carrier signal S f and outputs tag-specific data (DATA). I do.
- a data reading unit 50 is connected to the demodulation circuit 40, and the data reading unit 50 operates to read data unique to the tag.
- a control unit 15 is connected to the data reading unit 50, and a monitor 16 and an operation unit 17 are connected to the control unit 15.
- a central processing unit (hereinafter referred to as CPU) is used as the control unit 15.
- the monitor 16 displays a price, a name, and the like based on the unique data of the identification target object 9 read from the tag 10.
- the price, name, and the like are displayed based on the display data D2 after the control device 15 that has input the unique data of the identification target object 9 performs data conversion.
- the operation unit 17 is operated so as to instruct the control unit 15 to read out unique data such as a price and a name from the object 9 to be identified.
- the control unit 15 outputs operation data D3 indicating a reading instruction from the operation unit 17. ⁇ IJ control equipment 15
- the transmitting unit 12 is controlled based on the operation data D3.
- the control device 15 outputs the output permission signal S1 to the transmission section 12, and controls the output of the transmission section 12 to transmit the carrier signal Sf based on the output permission signal S1.
- the power supply unit 5 supplies power to the oscillator 11, the transmission unit 12, the control device 15, the monitor 16, the operation unit 17, the carrier compensation circuit 30, the demodulation circuit 40, and the data reading unit 50. Works. In FIG. 4, the description of the power supply wiring is omitted.
- FIG. 5A to FIG. 5C an operation example of the carrier signal S f, the response signal S f (D), and the combined carrier signal S f ′ handled by the carrier compensation circuit 30 will be described.
- the carrier signal Au (vector symbols omitted) shown in FIG. 5A is a signal reflected from a surrounding object, for example, based on a carrier signal S f having an amplitude of “3” at the time of transmission. .
- the carrier signal S f and the carrier signal A u have a phase difference of 0 u. Its amplitude fluctuates constantly, but at a certain moment, it declines to, for example, “2.5” (see Figure 7B).
- the response signal S f (D) shown in FIG. 5B is a tag modulation signal obtained by amplitude-modulating the carrier signal S f with data unique to the tag, and has a data modulation component Da and a carrier component Ad. I have.
- the data modulation component D a refers to tag-specific data that has been amplitude-modulated.
- the carrier component Ad and the carrier signal S f have a phase difference of 0 d. At a certain moment, the amplitude of the carrier component Ad decreases to, for example, “2.0” (see Fig. 7C).
- the carrier composite signal S f ′ shown in FIG. 5C is a vector composite of the carrier component Ad of the response signal S f (D) and the carrier signal A u reflected from the surrounding object. And noise components (noise). At a certain moment, its amplitude has expanded to, for example, “4.5” (see Figure 8C).
- the carrier compensation circuit 30 operates so as to remove noise components that have not been removed from the response composite signal Sin at the time of reception.
- the antenna 13 B receives the carrier composite signal S f shown in FIG. 5C, which is reflected from a surrounding object, and the response signal S f shown in FIG. 5B from the tag 10. It is considered that the response synthesized signal Sin including the data modulation component Da of (D) is input.
- the noise component in the response composite signal Sin at the time of reception is considered to be composed of the unmodulated carrier signal Au and the carrier component Ad of the response signal S f (D).
- the carrier wave compensation circuit 30 shown in FIG. 6 includes a phase synchronization detection unit 31 and an amplitude control unit 32.
- the phase synchronization detection unit 31 is a circuit that tracks the phase of the response composite signal Sin including the carrier composite signal S f ′ and the response signal S f (D).
- the circuit operates to reproduce the phase difference ⁇ r between the carrier signal Sf at the time of transmission and the composite signal Sf 'at the time of reception shown in FIG. 5C.
- the phase synchronization detection unit 31 includes, for example, a phase detection circuit 41, a phase difference comparison circuit 42, an LPF circuit 43, and a phase difference output circuit 44.
- the phase detection circuit 41 is connected to the transmission section 12 and the reception antenna 13B, and receives the response composite signal Sin at the time of reception and the carrier signal Sf at the time of transmission to detect the phase difference 0r.
- the frequency component of the carrier signal S f is referred (cheated) from the oscillator 11 and the phase of the carrier composite signal S f ′ of the response composite signal Siii during reception and the oscillator 11 1
- the phase is compared with the phase of the carrier signal Sf. As a result of this comparison, the phase difference 0r shown in FIG. 5C is detected.
- the phase difference comparison circuit 42 is connected to the phase detection circuit 41.
- the phase difference comparison circuit 42 compares the output of the phase difference output circuit 44 with the phase difference 0 r of the phase detection circuit 41 and locks the signal to the carrier composite signal S f, which is not synchronized with the carrier signal S f at the time of transmission. It outputs the synchronization detection signal (DC component) S d for this purpose.
- a multiplier is used for the phase detection circuit 41 and the phase difference comparison circuit 42.
- phase difference comparing circuit 42 is connected to the LPF circuit 43 by a force S. ? Circuit 43 Outputs a phase difference estimation voltage Vd by filtering the synchronization detection signal Sd.
- the phase difference estimation voltage V d is a DC voltage for estimating the phase difference ⁇ r of the carrier composite signal S f ′ that is not synchronized with the carrier signal S f at the time of transmission. 1? Circuit 43 is connected to phase difference output circuit 44, and outputs phase difference estimated value 0r 'based on phase difference estimated voltage Vd to phase difference comparison circuit 42 and amplitude control unit 32. Works as follows.
- the phase synchronization detection unit 31 detects and compares the phase difference 0 r between the carrier signal S f at the time of transmission and the combined carrier signal S f ′ at the time of reception, and compares the phase difference by a primary loop. It operates to estimate the difference 0 r and output the estimated phase difference value 0 r ′ to the phase difference comparison circuit 53 and the amplitude adjustment circuit 55 of the amplitude control unit 32.
- the amplitude control unit 32 generates a carrier composite signal S f ′ in which the carrier signal A u reflected from the surrounding object and the carrier component Ad of the response signal S f (D) from the tag 10 are combined.
- a circuit that tracks the amplitude This circuit operates to reproduce the amplitude of the carrier composite signal S f ′ at the time of reception.
- the amplitude controller 32 operates to remove the carrier composite signal S f ′ from the response composite signal S in at the time of reception.
- the amplitude control unit 32 makes the reproduced carrier composite signal S f, reproduced at the time of reception, out of phase and adds this to the response composite signal S in, thereby obtaining the response composite signal S at reception. removes the effects of the carrier signal A u reflected from surrounding objects and the carrier component Ad of the response signal S f (D) from in to obtain only the response signal S f (D) from the tag 10 Works as follows.
- the amplitude control section 32 includes, for example, an arithmetic circuit 51, a phase detection circuit 52, a phase difference comparison circuit 53, an LPF circuit 54, an amplitude (leveling) adjustment circuit 55, and a phase control circuit 56. have.
- the arithmetic circuit 51 is connected to the antenna unit 13B and the phase control circuit 56, and converts the carrier composite signal S f, phase-controlled by the phase control circuit 56, from the response composite signal S in at the time of reception. Acts like subtracting.
- a signal obtained by subtracting the carrier composite signal S f ′ from the response composite signal S in is the response signal S f (D) of the tag 10.
- a phase detection circuit 52 is connected to the arithmetic circuit 51.
- the carrier detection circuit 52 converts the carrier signal S f at the time of transmission and the output of the arithmetic circuit 51, that is, the response signal S f from the response composite signal S in at the time of reception. (D) is input until the carrier composite signal S f, is extracted, and the phase difference 0 r between the carrier composite signal S f ′ and the carrier signal S f at the time of transmission is detected. .
- the frequency component of the carrier signal S f is referred (cheated) from the oscillator 11 in the same manner as in the phase synchronization detection section 31, and the carrier synthesis of the response synthesis signal S in during reception is performed.
- the phase of the signal S f is compared with the phase of the carrier signal S f from the oscillator 11. As a result of this comparison, the phase difference 0r shown in FIG. 5C is detected.
- the phase difference comparison circuit 53 is connected to the phase detection circuit 52.
- the phase difference comparison circuit 53 outputs the phase difference estimated value ⁇ r 'from the phase difference output circuit 44 and the output signal of the phase detection circuit 52, that is, the phase difference 0 between the carrier composite signal S f' at the time of reception.
- phase difference comparing circuit 53 operates so as to output an amplitude adjustment signal (DC component) Sa for controlling the amplitude by locking to the carrier composite signal S f ′ at the time of reception.
- DC component amplitude adjustment signal
- an LPF circuit 54 is connected to the phase difference comparison circuit 53.
- the LPF circuit 54 filters the amplitude adjustment signal Sa output from the phase difference comparison circuit 53 and outputs an amplitude estimated value Va.
- the amplitude estimation value Va is a DC voltage that is not synchronized with the phase of the carrier signal Sf at the time of transmission and is used to estimate the amplitude value of the composite carrier signal Sf ′.
- the LPF circuit 54 is connected to an amplitude adjustment circuit 55.
- the amplitude adjustment circuit 55 receives the amplitude estimation value Va output from the LPF circuit 54 and the phase difference estimation value 0 r 'output from the phase difference output circuit 44, and receives the carrier composite signal at the time of reception.
- the amplitude is adjusted according to the estimated phase difference value 0 r 'of S f', and the amplitude component and phase difference component after the amplitude adjustment are output.
- the amplitude component A x and the phase difference component 0 X are for removing the carrier composite signal S f ′ from the response composite signal S in.
- a phase control circuit 56 is connected to the amplitude adjustment circuit 55.
- the phase control circuit 56 inputs the carrier signal S f at the time of transmission from the oscillator 11, and the phase difference component 0 X and the amplitude component A for removing the carrier composite signal S f ′ from the amplitude adjustment circuit 55. Enter x.
- the phase control circuit 56 controls the phase and the amplitude of the carrier signal S f output from the oscillator 11 based on the phase difference component ⁇ X and the amplitude component A x output from the amplitude adjustment circuit 55, Create a composite carrier signal S f '.
- the carrier composite signal S f ′ created by this phase and amplitude control is transmitted from the phase control circuit 56 to the arithmetic circuit 5.
- a multiplier is used for the phase detection circuit 52, the phase difference comparison circuit 53, the amplitude adjustment circuit 55, and the phase control circuit 56.
- the composite carrier signal S f ′ is composed of the carrier signal Au reflected from the surrounding object during reception shown in FIG. 5A and the carrier component Ad included in the response signal S f (D) shown in FIG. 5B. And each is a signal whose phase is shifted from the carrier signal S f at the time of transmission.
- the phase control loop is locked when the estimated phase difference value 0 r ′ is equal to the phase difference 0 r of the carrier composite signal S f ′, and the carrier signal is converted from the response composite signal S in at the time of reception.
- the process of removing the composite signal S f ′ can be completed.
- the operation is such that the phase control loop processing is repeatedly executed until the estimated phase difference value 0 r ′ matches the phase difference 0 r of the carrier composite signal S f ′.
- the arithmetic circuit 51 operates to subtract (subtract) the above-described carrier composite signal Sf ′ from the response composite signal Sin at the time of reception.
- Arithmetic circuit 51 outputs to demodulation circuit 40 only response signal S ⁇ (D) amplitude-modulated by carrier signal S f during transmission.
- the demodulation circuit 40 operates to demodulate the response signal S f (D) based on the carrier signal S f and output tag-specific data (DATA).
- FIGS. 7A to 7C show waveform examples of the carrier signal Sf and the carrier signals Au and Ad having a phase shift
- FIGS. 8A to 8C show waveform examples of main components in the tag reader system 100, respectively.
- Figure 8A shows the tag-specific data
- Figure 8B shows the response signal S f (D) amplitude-modulated based on the carrier signal S f
- Figure 8 C shows the response signal S f (D) and the carrier composite signal
- the waveform is described by capturing a certain moment and prolonging the state. In practice, the amplitude fluctuates with time, resulting in a complex wave F.
- the carrier compensation circuit 30 is arranged in the receiving section 14 of the tag reader 20 and before the data reading section 50, for example, before the demodulation circuit 30.
- a tag 10 that receives the 2.45 GHz carrier signal S f, modulates the amplitude of the carrier signal S f with predetermined data, and transmits a response signal S f (D) is attached to the object 9 to be identified.
- the carrier signal S f is transmitted to the tag 10 attached to the object to be identified 9, and the combined IS response signal Sin returned from the tag 10 is transmitted to the tag 10. • It is assumed that the signal is received and processed by reader 20 (backscatter communication wireless communication method).
- the phase of the carrier signal Sf at the time of transmission is compared with the phase of the carrier signal Sf 'at the time of reception. It operates so as to remove the carrier composite signal S f ′ that is not synchronized with the phase of the carrier signal S f at the time of transmission based on the comparison result.
- a carrier signal S f of 2.45 GHz shown in FIG. 7A is generated by the oscillator 11 shown in FIG.
- the carrier signal S f generated by the oscillator 11 is output to the transmission unit 12.
- the carrier signal S f has, for example, an amplitude “3”.
- the transmitting unit 12 amplifies the carrier signal Sf to have an amplitude of "3" or more based on the output permission signal S1 from the control device 15 and transmits the amplified carrier signal Sf to the transmitting antenna 13A. It works to output to.
- the output permission signal S1 is, for example, transmission enabled at a high level and transmission disabled at a low level.
- the amplified carrier signal (interrogation signal) S f is radiated from the transmitting antenna 13 A toward the tag 10.
- tag 10 receives a carrier signal (interrogation signal) S f of 2.45 GHz.
- the interrogation signal transmitted from the tag reader 20 is reflected by the surrounding objects and the tag 10 and returns.
- the signal reflected from other than the tag is compared with the carrier signal S f transmitted from the tag reader 20 as shown in FIG. (One carrier signal).
- the carrier signal (interrogation signal) S f radiated toward the tag 10 is reflected by an object other than the tag, and compared with the carrier signal S f during transmission as shown in Fig. 7B.
- the phase of the carrier signal A u at the time of reception is shifted, and the amplitude is reduced to, for example, “2”.
- 0 u indicates a phase shift (phase difference).
- the phase difference ⁇ u is the difference between the phase of the carrier signal S f radiated from the transmission unit 12 and the phase of the carrier signal A u reflected from the object.
- the induced power based on the carrier signal Sf received by the antenna unit 1A is converted into the amplitude modulation unit 2, the memory unit 3, and the It is supplied to the clock oscillator 4.
- data code data and the like; DATA
- the data is read out based on the clock signal (CLK), and the data is output to the amplitude modulator 2.
- the clock signal is oscillated by the clock oscillator 4 and output to the memory unit 3.
- the system 100 does not need to include a battery or the like in the tag 10.
- the carrier signal S f is amplitude-modulated by the unique data read from the memory unit 3, and the amplitude-modulated tag amplitude modulation signal (response signal) as shown in FIG. It operates to send S f (D).
- the response signal S f (D) is scattered (transmitted) through the antenna 1B.
- a BPSK (Binary Phase Shift Keying) modulator may be provided instead of the amplitude modulator 2.
- the response signal S f (D) scattered (transmitted) from the antenna 1B is received by the antenna 13B of the tag reader 20.
- the carrier composite signal S f ′ including the carrier signal A u reflected from the object also becomes the response composite signal S in together with the response signal S f (D) as shown in FIG. Received through 3B.
- the phase synchronization detection unit 31 connected to the antenna 13 B tracks the phases of the carrier composite signal S f ′ and the response composite signal S in including the response signal S f (D), as shown in FIG. It operates to reproduce the phase difference ⁇ r between the transmitted carrier signal S f at the time of transmission and the carrier composite signal S f ′ at the time of reception.
- the phase detection circuit 41 the frequency component of the carrier signal S f is referred (cheated) from the oscillator 11, and the phase of the response composite signal S in at the time of reception and the carrier signal S f from the oscillator 11 are The phase is compared. As a result of this comparison, the phase difference ⁇ r of the carrier composite signal S f shown in FIG. 5C is detected.
- the phase difference 0 r of the carrier composite signal S f ′ is output to the phase difference comparison circuit 42.
- the phase difference comparison circuit 42 compares the estimated phase difference value 0 r ′ output from the phase difference output circuit 44 with the phase difference ⁇ r output from the phase detection circuit 41, and compares the carrier signal during transmission. It operates to output a synchronization detection signal (DC component) Sd for locking to the carrier composite signal Sf, which is not synchronized with the signal Sf.
- DC component synchronization detection signal
- the synchronization detection signal Sd is output to the LPF circuit 43.
- the circuit 43 filters the synchronization detection signal Sd and outputs a phase difference estimation voltage Vd.
- the phase difference estimation voltage V d is the phase difference of the carrier composite signal S f ′ that is not synchronized with the carrier signal S f during transmission. DC voltage for estimating 0r.
- the phase difference estimation voltage Vd is output from the LPF circuit 43 to the phase difference output circuit 44.
- the phase difference output circuit 44 operates to output the estimated phase difference value 0 r ′ based on the estimated phase difference voltage Vd to the phase difference comparison circuit 42 and the amplitude control unit 32.
- the phase synchronization detection unit 31 detects and compares the phase difference 0 r between the carrier signal S f at the time of transmission and the combined carrier signal S f ′ at the time of reception, and the phase difference is detected by the primary loop. It operates to estimate ⁇ r and output the estimated phase difference value 0 r ′ to the phase difference comparison circuit 53 and the amplitude adjustment circuit 55 of the amplitude control unit 32.
- the amplitude control unit 32 also generates a carrier composite signal S f ′ in which the carrier signal Au reflected from the surrounding object and the carrier component Ad of the response signal S f (D) from the tag 10 are combined. It operates to track the amplitude of.
- the arithmetic circuit 51 operates to subtract (subtract) the carrier composite signal S f ′ whose phase has been controlled by the phase control circuit 56 from the response composite signal Sin at the time of reception.
- a signal obtained by subtracting the carrier composite signal S f ′ from the response composite signal Sin is the response signal S f (D) of the tag 10 and includes the data modulation component Da.
- the arithmetic circuit 51 sends the phase detection circuit 52 a response from the carrier signal S f at the time of transmission and the response signal Sin at the time of reception.
- the carrier composite signal S f ′ until the signal S f (D) is extracted is output.
- the phase detection circuit 52 receives and transmits the carrier signal Sf at the time of transmission and the carrier signal Sf 'until the response signal Sf (D) is extracted from the response signal Sin at the time of reception. It operates so as to detect a phase difference 0r between the wave composite signal S f ′ and the carrier signal S f at the time of transmission.
- the frequency component of the carrier signal S f is referred to (cheated) from the oscillator 11 in the same manner as the phase synchronization detection section 31 and the carrier composite signal S f of the response composite signal Sin at the time of reception is received. 'And the phase of the carrier signal S f from the oscillator 11 are compared. As a result of this comparison, the phase difference 0r shown in FIG. 5C is detected.
- the phase difference 0 r is output from the phase detection circuit 52 to the phase difference comparison circuit 53.
- the phase difference comparison circuit 53 receives the phase difference estimated value 0 r from the phase difference output circuit 44 and the phase difference 0 r of the carrier composite signal S f at reception output from the phase detection circuit 52. Then, it operates so as to compare the phase difference estimated value 0 r ′ with the phase difference 0 r of the carrier composite signal S f ′. Based on the comparison result, the phase difference comparison circuit 53 outputs to the LPF circuit 54 an amplitude adjustment signal (DC component) Sa for controlling the amplitude by locking to the carrier composite signal Sf 'at the time of reception.
- DC component amplitude adjustment signal
- the filter 54 filters the amplitude adjustment signal Sa output from the phase difference comparison circuit 53 and outputs an amplitude estimation value Va.
- the amplitude estimation value Va is a DC voltage that is not synchronized with the phase of the carrier signal Sf at the time of transmission and is used to estimate the amplitude value of the composite carrier signal Sf ′.
- the amplitude estimation value Va is output from the LPF circuit 54 to the amplitude adjustment circuit 55.
- the amplitude adjustment circuit 55 receives the amplitude estimation value Va output from the LPF circuit 54 and the phase difference estimation value ⁇ r ′ output from the phase difference output circuit 44, and receives the carrier composite signal S f ′ during reception.
- the amplitude is adjusted in accordance with the estimated phase difference value 0 r ′, and the amplitude component Ax and the phase difference component 0 X after the amplitude adjustment are output.
- the amplitude component Ax and the phase difference component 0 X is for removing the carrier composite signal S f 5 from the response composite signal Sin.
- the amplitude component Ax and the phase difference component 0 X are output from the amplitude adjustment circuit 55 to the phase control circuit 56.
- the phase control circuit 56 inputs the carrier signal S f at the time of transmission from the oscillator 11, and also inputs the phase difference component 0 X and the amplitude component Ax for removing the combined carrier signal S f ′ from the amplitude adjustment circuit 55. I do.
- the phase control circuit 56 controls the phase and amplitude of the carrier signal S f output from the oscillator 11 based on the phase difference component 0 X and the amplitude component Ax output from the amplitude adjustment circuit 55, and Create S f '.
- the carrier composite signal S f ′ created by the phase and amplitude control is output from the phase control circuit 56 to the arithmetic circuit 51.
- the composite carrier signal S f ′ is composed of the carrier signal Au reflected from the surrounding object during reception shown in FIG. 5A and the carrier component Ad included in the response signal S f (D) shown in FIG. 5B. And each is a signal whose phase is shifted from the carrier signal S f at the time of transmission.
- the carrier composite signal S f ′ is removed from the response composite signal Sin at the time of reception. be able to.
- the carrier composite signal S f ′ is removed from the response composite signal Sin.
- the obtained response signal S f (D) is output to the demodulation circuit 40.
- the demodulation circuit 40 operates to demodulate the response signal S f (D) based on the carrier signal S f and output tag-specific data (DATA).
- DATA tag-specific data
- the data is read by the data reading section 50 and displayed on the monitor 16 through the controller 15. On the monitor 16, a price, a name, and the like based on the unique data of the identification target object 9 read from the tag 10 are displayed.
- the amplitude control unit 32 of the reception unit 14 uses the tag
- the carrier signal S f ′ is reproduced based on the phase difference component 0 X and the amplitude component Ax of the carrier signal S f transmitted from the reader 20 and the carrier signal S f ′, and reproduced here. It operates so that the carrier composite signal S f ′ at the time of reception is inverted, and this is added to the response composite signal (tag 10 amplitude modulation signal) Sin.
- the carrier composite signal S f ′ including the carrier signal A u reflected from the surrounding object can be removed from the response composite signal Sin at the time of reception, and the response signal (tag amplitude modulation signal) from the tag 10 can be removed. Only S f (D) can be obtained. Thereby, the data modulation component Da included in the response signal Sf (D) returned from the tag 10 can be compensated, and the SZN ratio of the response signal Sf (D) can be improved. Moreover, highly reliable data that is not affected by interference noise can be demodulated with a relatively simple circuit configuration. Industrial applicability
- the present invention relates to a system for reading an electronic price tag attached to tableware at a restaurant or a product at a store, a system for reading an electronic tag attached to an article distributed on an article distribution base, etc. It is very suitable to be applied to a guidance sign reading system or the like that guides a person.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/573,765 US7705711B2 (en) | 2003-09-30 | 2004-09-29 | Information-processing apparatus, wireless communication system and wireless communication method |
EP04788457A EP1677428A4 (en) | 2003-09-30 | 2004-09-29 | INFORMATION PROCESSING APPARATUS, RADIO COMMUNICATION SYSTEM, AND RADIO COMMUNICATION METHOD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-341468 | 2003-09-30 | ||
JP2003341468 | 2003-09-30 |
Publications (1)
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WO2005031997A1 true WO2005031997A1 (ja) | 2005-04-07 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/014692 WO2005031997A1 (ja) | 2003-09-30 | 2004-09-29 | 情報処理装置、無線通信システム及び無線通信方法 |
Country Status (5)
Country | Link |
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US (1) | US7705711B2 (ja) |
EP (1) | EP1677428A4 (ja) |
KR (1) | KR101039947B1 (ja) |
CN (1) | CN100559730C (ja) |
WO (1) | WO2005031997A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100773269B1 (ko) | 2006-05-30 | 2007-11-09 | 주식회사 하이온콥 | 수신 감도가 향상된 무선 주파수 인식 시스템의 리더 장치 |
Families Citing this family (4)
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FI119453B (fi) * | 2006-01-30 | 2008-11-14 | Voyantic Oy | Laite ja menetelmä radiotaajuusjärjestelmiä varten |
US8610543B2 (en) * | 2010-06-23 | 2013-12-17 | Tyco Fire & Security Gmbh | Hybrid architecture for radio frequency identification and packet radio communication |
CN103366213B (zh) * | 2012-03-31 | 2016-08-03 | 华矽半导体股份有限公司 | 主动式电子标签及其信号调变方法 |
US9396370B2 (en) * | 2013-04-25 | 2016-07-19 | Atmel Corporation | Carrier compensation reader |
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JPH08122429A (ja) * | 1994-10-25 | 1996-05-17 | Sumitomo Electric Ind Ltd | 移動体識別装置の干渉補償装置 |
JPH1062518A (ja) * | 1996-08-13 | 1998-03-06 | Kenwood Corp | キャリア位相雑音抑圧回路 |
EP1306794A2 (en) | 2001-10-23 | 2003-05-02 | Ncr International Inc. | Methods and apparatus for a spread spectrum modulated backscatter electronic shelf label system |
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US4888591A (en) * | 1988-10-06 | 1989-12-19 | Amtech Technology Corporation | Signal discrimination system |
JP3073308B2 (ja) | 1992-04-14 | 2000-08-07 | 三菱重工業株式会社 | 非接触icカード装置 |
JP3207280B2 (ja) | 1992-12-18 | 2001-09-10 | シチズン時計株式会社 | データキャリアシステム |
JPH07193519A (ja) | 1993-12-27 | 1995-07-28 | Japan Radio Co Ltd | 背景雑音低減装置 |
JPH08330988A (ja) | 1995-06-05 | 1996-12-13 | Nippon Avionics Co Ltd | ノイズ除去機能付き非接触識別コード読取装置 |
US6107910A (en) * | 1996-11-29 | 2000-08-22 | X-Cyte, Inc. | Dual mode transmitter/receiver and decoder for RF transponder tags |
CA2248507A1 (en) | 1997-11-07 | 1999-05-07 | Lucent Technologies Inc. | Direct sequence spread spectrum modulated uplink for modulated backscatter systems |
FR2792133B1 (fr) * | 1999-04-07 | 2001-11-16 | St Microelectronics Sa | Regulation de phase d'un lecteur de transpondeurs electromagnetiques |
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2004
- 2004-09-29 US US10/573,765 patent/US7705711B2/en not_active Expired - Fee Related
- 2004-09-29 WO PCT/JP2004/014692 patent/WO2005031997A1/ja active Application Filing
- 2004-09-29 EP EP04788457A patent/EP1677428A4/en not_active Withdrawn
- 2004-09-29 KR KR1020067005281A patent/KR101039947B1/ko not_active IP Right Cessation
- 2004-09-29 CN CNB2004800280740A patent/CN100559730C/zh not_active Expired - Fee Related
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JPH08122429A (ja) * | 1994-10-25 | 1996-05-17 | Sumitomo Electric Ind Ltd | 移動体識別装置の干渉補償装置 |
JPH1062518A (ja) * | 1996-08-13 | 1998-03-06 | Kenwood Corp | キャリア位相雑音抑圧回路 |
EP1306794A2 (en) | 2001-10-23 | 2003-05-02 | Ncr International Inc. | Methods and apparatus for a spread spectrum modulated backscatter electronic shelf label system |
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KR100773269B1 (ko) | 2006-05-30 | 2007-11-09 | 주식회사 하이온콥 | 수신 감도가 향상된 무선 주파수 인식 시스템의 리더 장치 |
Also Published As
Publication number | Publication date |
---|---|
KR101039947B1 (ko) | 2011-06-09 |
US7705711B2 (en) | 2010-04-27 |
CN1860692A (zh) | 2006-11-08 |
EP1677428A4 (en) | 2012-11-21 |
US20070120674A1 (en) | 2007-05-31 |
KR20060069493A (ko) | 2006-06-21 |
CN100559730C (zh) | 2009-11-11 |
EP1677428A1 (en) | 2006-07-05 |
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