WO2006114845A1 - 送受信に同一搬送波を用いる無線装置 - Google Patents
送受信に同一搬送波を用いる無線装置 Download PDFInfo
- Publication number
- WO2006114845A1 WO2006114845A1 PCT/JP2005/006930 JP2005006930W WO2006114845A1 WO 2006114845 A1 WO2006114845 A1 WO 2006114845A1 JP 2005006930 W JP2005006930 W JP 2005006930W WO 2006114845 A1 WO2006114845 A1 WO 2006114845A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission
- reception
- sample
- same carrier
- command
- Prior art date
Links
Classifications
-
- 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
- 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
- G06K19/0723—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 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/02—Details
- H03D1/04—Modifications of demodulators to reduce interference by undesired signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
- H04L25/062—Setting decision thresholds using feedforward techniques only
Definitions
- the present invention relates to a wireless device that uses the same carrier wave for transmission and reception, and more particularly to a wireless device such as an RFID tag reader Z writer that uses the same carrier frequency for transmission and reception.
- RFID Radio Frequency Identification
- RFID tag readers that use radio waves Z writers and RFID tags perform reception (demodulation) using the same carrier signal as the carrier signal used when transmitting and receiving carrier frequencies are equal. Since a carrier signal of the same frequency is used for the transmission, the output of the demodulator is output due to re-reception due to leakage within the device of the transmission carrier signal (for example, directional coupler, circuit component placement on the board, etc.) or reflection of radio waves once emitted from the antenna.
- the signal contains a DC component, which functions as a DC offset.
- FIG. 1 is a diagram illustrating the principle of a reception circuit in a radio apparatus using the same carrier frequency for conventional transmission / reception.
- a receiving circuit in a conventional radio apparatus using the same carrier frequency for transmission and reception for example, an RFID tag reader Z writer, has a capacitor 62 disposed between a demodulator 60 and an amplifier 64, and the capacitor 62 is used to remove the DC component from the demodulator output signal.
- Patent Document 1 a technique for removing a DC component from an output signal force by arranging a capacitor is well known to those skilled in the art.
- FIG. 2 is a diagram showing a waveform of the conventional receiving circuit in FIG. 1 and an outline of its processing.
- the demodulator output has a DC offset, and if the capacitor is interposed, the demodulator output signal will inevitably be differentiated.
- the waveform is distorted and the original signal component cannot be extracted sharply.
- FIG. 3 is a diagram illustrating the principle of another receiving circuit in a wireless device using the same carrier frequency for conventional transmission / reception.
- a plurality of capacitors 61, 62 are arranged in the receiving circuit of the RFID tag reader Z writer, and the plurality of capacitors 61, 62 are switched appropriately by the switch SW63, so that a plurality of transmission / reception transfer rates of the RFID tag differ. It was made to correspond to the protocol. However, in order to support multiple protocols with different transmission / reception transfer rates, it is necessary to switch the capacitor, so that it is too complicated to withstand actual use. When the waveform collapses, the problem can be dealt with, and there are other disadvantages.
- Patent Document 1 JP-A-9-331298
- the DC component that is a problem in the above-described conventional configuration largely depends on the transmission carrier leak in the RFID tag reader Z writer and the environment of the RFID tag reader Z writer surrounding the RFID tag, but is in communication with the RFID tag.
- the direct current component has very little fluctuation.
- the present invention aims to solve the above-mentioned problems by paying attention to such characteristics. That is, according to the present invention, in a wireless device using the same carrier frequency for transmission and reception, a direct current component generated by an interference wave such as carrier leak riding on a baseband signal demodulated by a demodulator in the receiving circuit is obtained. Memory by sample / hold circuit The DC component is removed by a differential amplifier circuit at the next stage, and a desired baseband signal can be amplified with a high gain.
- the present invention since it is possible to amplify after removing unnecessary DC components, it is possible to increase the amplification factor of the amplifier to two digits or three digits. The effect is obtained.
- the DC component contained in the received baseband signal can be completely removed, the desired signal component amplitude-modulated over the passive tag that transmits using the carrier signal used at the time of transmission is ensured. The effect that it can be reproduced is obtained.
- the present invention can extract a desired signal component amplitude-modulated without depending on the transmission / reception transfer rate of the RFID tag.
- FIG. 1 is a diagram showing the principle of a receiving circuit in a radio apparatus using the same carrier frequency for conventional transmission / reception.
- FIG. 2 is a diagram showing a waveform of the conventional receiving circuit in FIG. 1 and an outline of its processing.
- FIG. 3 is a diagram showing the principle of another receiving circuit in a radio apparatus using the same carrier frequency for conventional transmission / reception.
- FIG. 4 is a diagram showing the principle of a receiving circuit in a radio apparatus using the same carrier frequency for transmission and reception according to an embodiment of the present invention.
- FIG. 5 is a block diagram showing a schematic configuration of a radio apparatus using the same carrier frequency for transmission / reception according to the embodiment of the present invention.
- FIG. 6 is a diagram showing a waveform of the receiving circuit in FIG. 4 and an outline of its processing.
- FIG. 7 is a waveform diagram in which the sample points shown in FIG. 6 are varied.
- FIG. 4 is a diagram illustrating the principle of a reception circuit in a radio apparatus using the same carrier frequency for transmission and reception according to the embodiment of the present invention.
- a radio apparatus using the same carrier frequency for transmission and reception according to the embodiment of the present invention is applied to, for example, an RFID tag reader Z writer, and a receiving circuit in the RFID tag reader Z writer is as shown in FIG.
- the RF received signal (Rx) coming from the antenna (see Fig. 5) is recovered based on the local (Lo) signal!
- a sample demodulator DEM30 and a sample (hold) circuit SH23 that stores and holds the DC component contained in the demodulated signal of the demodulator 30 by performing sampling with a trigger of a DSP (Digital Signal Processor) (see FIG. 5), It is configured to include a differential amplifier 24 that adds the DC component stored and held to the inverting input terminal and adds the amplitude-modulated received signal component to the non-inverting input terminal for differential amplification and output.
- DSP Digital Signal
- FIG. 5 is a block diagram showing a schematic configuration of a radio apparatus using the same carrier frequency for transmission and reception according to the embodiment of the present invention.
- the radio apparatus using the same carrier frequency for transmission / reception of the present invention shown in FIG. 5 is the same as the schematic configuration of the RFID tag reader Z writer described above, so here, the RFID tag reader Z writer will be described as an example.
- the RFID tag reader Z writer sends a command (transmission command) to an RFID tag (not shown) under the initiative of DSP (Digital Signal Processor) 1 to read and write data.
- DSP Digital Signal Processor
- the digital-analog converter (D / A) 2 sends a read Z write command to the RFID tag to the mixer 12 of the transmission circuit 10 as a baseband signal. Applied as (IF) signal.
- the mixer 12 of the transmission circuit 10 converts the applied baseband (IF) signal into a radio frequency (RF) signal based on the local (Lo) signal 4 and amplifies it by the amplifier 11 to directional coupler 5.
- RF radio frequency
- a high-frequency signal (RF) is radiated from the antenna 6 to an RFID tag (not shown).
- the RFID tag When the RFID tag (not shown) receives the read Z write 'command from the DSP1 at the receiving unit (not shown), it processes the read Z write' command in the RFID tag and sends the response signal from the RFID tag to the DSP1. Send from the transmitter (not shown). Since the nosy RFID tag does not have a power supply for signal transmission in its own device, the transmission carrier from the RFID tag reader / writer's transmission circuit 10 is used as the response signal transmission carrier, and the response signal is amplitude-modulated to generate a high frequency ( (RF) Response signal is sent to the receiving circuit 20 of the RFID tag reader Z writer.
- RF high frequency
- the amplitude-modulated high-frequency (RF) response signal is first amplified by the amplifier 21 via the antenna 6 and the directional coupler 5, and then received by the receiving circuit 20 to which the local (Lo) signal 4 is applied.
- IF) signal is converted to a digital signal by DSP1 via analog-to-digital converter (A / D) 3 after the DC component is removed by the function of the receiver circuit explained in Fig. 4 and further amplified and amplitude-modulated.
- a / D analog-to-digital converter
- FIG. 6 is a diagram showing an outline of the waveform of the receiving circuit in FIG. 4 and its processing.
- the upper part of FIG. 6 shows the output waveform of the demodulator 30, and the sampling position is also shown as the sample point (a).
- both the solid line waveform and the broken line waveform are shown with a DC offset. This indicates that both the solid line waveform and the broken line waveform are observed as the demodulator DEM output depending on the distance and environment between the RFID tag reader Z writer and the RFID tag, as well as carrier leakage from the directional coupler. Yes.
- the tag response signal which is a desired signal, is added with a DC offset.
- the sample-and-hold circuit of the present invention memorizes and holds this DC offset by, for example, sampling at the sample point (a), and stores the held DC offset and the desired signal component in the inverting input terminal and the non-inverting input of the differential amplifier. Since the DC offset can be completely removed by applying each to the end, a desired signal component from which the DC component is removed as shown in the waveform diagram at the bottom of Fig. 6 is extracted and the desired signal component has a small dynamic range. Therefore, a desired signal component having a sufficient signal level can be obtained by performing an amplification operation on the desired signal component. In addition, the leak of the transmission command that can also obtain the receiving circuit power is not the desired signal V, so it is ignored by DSP1!
- FIG. 7 is a waveform diagram in which the sample points shown in FIG. 6 are different, and the sampling position is the sample point (b), and the sampling position shown in the upper waveform diagram of FIG. 6 is a sample.
- the point (a) is at a different position.
- the trigger given to the sample and hold circuit 23 from DSP1 is issued at any timing except the transmission period of the transmission command as the read Z write command command from DSP1 shown in Fig. 5 is issued. Is realized.
- the sample 'hold circuit of the present invention stores the DC offset by sampling at the sample point (b) and holds the held DC offset and the desired signal component at the inverting input terminal and the non-inverting input terminal of the differential amplifier, respectively.
- RFID tag reader Z writer reception circuit 20 is RFID
- the sample point position can be changed at any timing until the desired signal component with tag power is started to be received and the transmission read Z write 'command is not transmitted.
- the sampling position of the upper waveform in FIG. 6, that is, the sampling position shown in FIG. 7 from the sample point (a) is excluded from the transmission period of the transmission command from the sample point (b). You can change the sample point to any position.
- the trigger is given multiple times from DSP1 to the sample and hold circuit 23 from the sample point (a) to the sample point (b) excluding the transmission period of the above transmission command, and multiple sample and hold are performed. You may make it do. Further, although not shown in the figure, the timing of sampling and holding may be changed depending on the content of the transmission command, that is, whether the transmission command is a read force or a write.
- the amplification factor (gain) of the amplifier has been dramatically improved (in the past, the amplification factor was in the single digit range). It can be increased to at least two digits), and the desired signal component can be reliably reproduced. As a result, it is possible to facilitate handling of minute signals with a passive RFID tag force far away from the antenna.
- the wireless device using the same carrier frequency for transmission and reception according to the present invention can reliably reproduce the amplitude-modulated desired signal component by completely removing the DC offset of the wireless device.
- RFID tag readers that use By applying to Z-writers, it will be possible to expand the use of non-sensitive RFID tags.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05728518A EP1871062A1 (en) | 2005-04-08 | 2005-04-08 | Wireless device using same carrier wave for transmission and reception |
PCT/JP2005/006930 WO2006114845A1 (ja) | 2005-04-08 | 2005-04-08 | 送受信に同一搬送波を用いる無線装置 |
CNA2005800494138A CN101160890A (zh) | 2005-04-08 | 2005-04-08 | 在发送接收中使用相同载波的无线装置 |
JP2007514365A JP4447638B2 (ja) | 2005-04-08 | 2005-04-08 | 送受信に同一搬送波を用いる無線装置 |
US11/869,202 US20080032655A1 (en) | 2005-04-08 | 2007-10-09 | Wireless apparatus using the same carrier wave for transmission and reception |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/006930 WO2006114845A1 (ja) | 2005-04-08 | 2005-04-08 | 送受信に同一搬送波を用いる無線装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/869,202 Continuation US20080032655A1 (en) | 2005-04-08 | 2007-10-09 | Wireless apparatus using the same carrier wave for transmission and reception |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006114845A1 true WO2006114845A1 (ja) | 2006-11-02 |
Family
ID=37214484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/006930 WO2006114845A1 (ja) | 2005-04-08 | 2005-04-08 | 送受信に同一搬送波を用いる無線装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080032655A1 (ja) |
EP (1) | EP1871062A1 (ja) |
JP (1) | JP4447638B2 (ja) |
CN (1) | CN101160890A (ja) |
WO (1) | WO2006114845A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7429129B2 (en) | 2005-02-28 | 2008-09-30 | Standard Microsystems Corporation | Proportional settling time adjustment for diode voltage and temperature measurements dependent on forced level current |
WO2018100406A1 (en) * | 2016-11-29 | 2018-06-07 | Kookmin University Industry Academy Cooperation Foundation | Systems and methods for duplex visible light communication without external power source based on backscattering of modulated light |
CN109217883B (zh) * | 2018-08-30 | 2021-04-13 | 维沃移动通信有限公司 | 一种电压控制方法、移动终端 |
CZ309665B6 (cs) * | 2019-09-03 | 2023-06-28 | Y Soft Corporation, A.S. | Způsob zpracování signálu pasivního RFID čipu čtečkou |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11298541A (ja) * | 1998-04-15 | 1999-10-29 | General Res Of Electron Inc | 中心レベル誤差検出補正回路 |
JP2001516516A (ja) * | 1996-08-02 | 2001-09-25 | ゼニス エレクトロニクス コーポレイション | Dcオフセット補償方法及び装置 |
JP2002368830A (ja) * | 2001-06-08 | 2002-12-20 | Dainippon Printing Co Ltd | 信号受信部 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11298542A (ja) * | 1998-04-06 | 1999-10-29 | General Res Of Electron Inc | 中心誤差検出補正回路 |
CA2292463C (en) * | 1999-12-17 | 2005-04-12 | Vtech Communications, Ltd. | Digitally-implemented demodulator |
JP2005032290A (ja) * | 2003-07-07 | 2005-02-03 | Ricoh Co Ltd | 情報記録媒体及び光ディスク装置 |
-
2005
- 2005-04-08 WO PCT/JP2005/006930 patent/WO2006114845A1/ja not_active Application Discontinuation
- 2005-04-08 JP JP2007514365A patent/JP4447638B2/ja active Active
- 2005-04-08 EP EP05728518A patent/EP1871062A1/en not_active Withdrawn
- 2005-04-08 CN CNA2005800494138A patent/CN101160890A/zh active Pending
-
2007
- 2007-10-09 US US11/869,202 patent/US20080032655A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001516516A (ja) * | 1996-08-02 | 2001-09-25 | ゼニス エレクトロニクス コーポレイション | Dcオフセット補償方法及び装置 |
JPH11298541A (ja) * | 1998-04-15 | 1999-10-29 | General Res Of Electron Inc | 中心レベル誤差検出補正回路 |
JP2002368830A (ja) * | 2001-06-08 | 2002-12-20 | Dainippon Printing Co Ltd | 信号受信部 |
Also Published As
Publication number | Publication date |
---|---|
JP4447638B2 (ja) | 2010-04-07 |
JPWO2006114845A1 (ja) | 2008-12-11 |
US20080032655A1 (en) | 2008-02-07 |
EP1871062A1 (en) | 2007-12-26 |
CN101160890A (zh) | 2008-04-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1830301B1 (en) | RFID reader architecture | |
US9307352B2 (en) | Apparatus and method for near field communication | |
US7532908B2 (en) | Transceiver and method for combining RFID amplitude-modulated data with wireless phase-modulated data | |
CA2571082C (en) | Digital frequency determining apparatus and methods using matched filters | |
US20060238301A1 (en) | Multi-protocol radio frequency identification transponder tranceiver | |
EP1286179A3 (en) | Method of interrogating a radio frequency identification device | |
EP2586132B1 (en) | Hybrid architecture for radio frequency identification and packet radio communication | |
JP2008061218A (ja) | 半導体集積回路装置および受信装置 | |
CN101361287A (zh) | 移动射频标识读取器 | |
JP4060854B2 (ja) | 移動体識別装置の質問器 | |
WO2006114845A1 (ja) | 送受信に同一搬送波を用いる無線装置 | |
US6937615B1 (en) | Multi-purpose bridge for wireless communications | |
US7570920B2 (en) | AM-FM hybrid signal communicated to RFID tags | |
JP2002353852A (ja) | 無線通信装置および無線通信システム | |
KR20100008282A (ko) | Rfid 리더 시스템 및 rfid 리더의 송신누설신호제거 방법 | |
JP2010198396A (ja) | 無線タグリーダライタ及びその通信方法 | |
KR100902519B1 (ko) | 송수신부가 필터를 공유하는 rfid 송수신기 | |
KR20070110392A (ko) | 송수신에 동일 반송파를 이용하는 무선 장치 | |
JP2007027883A (ja) | Ask復調器、無線通信装置、並びに反射波通信システム | |
KR20090041553A (ko) | Fft 알고리즘을 이용하여 밀집모드를 지원하는 수동형rfid 리더 | |
JP4628992B2 (ja) | 無線送受信機 | |
EP4274106A1 (en) | Communication device and method for operating same | |
JP5457406B2 (ja) | 質問器装置、通信方法及び通信プログラム | |
KR100911821B1 (ko) | Rfid 태그 | |
KR101004531B1 (ko) | 시공간 방식을 이용한 rfid 리더기 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2007514365 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020077022049 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580049413.8 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2005728518 Country of ref document: EP Ref document number: 11869202 Country of ref document: US |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: DE |
|
NENP | Non-entry into the national phase |
Ref country code: RU |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: RU |
|
WWP | Wipo information: published in national office |
Ref document number: 2005728518 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11869202 Country of ref document: US |