CN102130700B - Received signal processing method and implementation device thereof - Google Patents
Received signal processing method and implementation device thereof Download PDFInfo
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- CN102130700B CN102130700B CN 201010000667 CN201010000667A CN102130700B CN 102130700 B CN102130700 B CN 102130700B CN 201010000667 CN201010000667 CN 201010000667 CN 201010000667 A CN201010000667 A CN 201010000667A CN 102130700 B CN102130700 B CN 102130700B
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Abstract
The invention relates to a received signal processing method and an implementation device thereof, and discloses a method for processing a signal in a radio frequency network. In the method, effective modulation signals are obtained by utilizing control over the extraction of a single-carrier time bucket in a signal transmitted by a reader-writer and the mixing of carrier signals in received electronic label echoes. The invention also provides a method for implementing the signal processing method. The device comprises low-noise detectors connected with the receiving end of an antenna to realize a mixing function, wherein the low-noise detector is connected to a micro control unit (MCU) by a differential amplification circuit, and controls a signal transmission time by the MCU to finish extracting single-carrier mixing signals transmitted by an electronic label and the reader-writer in the time bucket to further finish signal demodulation, and the signals of the other time buckets are not extracted. By the method and the device, the problem of channel blockage of conventional same-antenna and same-frequency transmission and reception is solved, and zero-intermediate frequency signal receiving can be realized.
Description
Technical field
Communication when the present invention relates to wireless communication field and being primarily aimed at sending and receiving under the merotype relates in particular to a kind of processing method and implement device thereof of received signal.
Background technology
In the radio communication receiving circuit, during with frequently, with the antenna sending and receiving, owing to transmit and received signal is used unified radio frequency network jointly, the strong signal of same frequency when causing emission directly enters with the frequency receiving terminal, the passage that forms receiving terminal is saturated, be exactly that receiving terminal is coupled into the strong signal of transmitting terminal in brief, will cause the saturated obstruction of receive path like this, this phenomenon is the difficult problem that industry solves always.
Methods such as separation of sending and receiving antenna or single antenna transmitting-receiving employing loop filter are the patterns of always continuing to use that addresses this is that; Another kind of pattern is exactly to adopt the frequent mode of switching of electronic switch transmitting-receiving to realize, and can't realize on the product of time requirement strictness.So just cause the problem in the realizations such as the miniaturization of products, cost control to be difficult to solve.
Summary of the invention
Can avoid the processing method of the received signal of receive path saturation jamming when the object of the present invention is to provide a kind of transmit-receive cofrequency, the collection of same channel signal, the present invention also aims to provide a kind of R-T unit of realizing described method.
To achieve these goals, the technical solution used in the present invention is as follows:
The processing method of received signal of the present invention comprises:
Reader period that transmits is defined as T+t, and wherein T is that modulation signal period, t are along the single carrier period before and after the firing order;
At the receiving terminal extraction two paths of signals that is coupled simultaneously: transmit and received signal;
Be the finish time of modulation signal period T the zero hour that the received signal processing is set, and be the zero hour of modulation signal period T the finish time that the received signal processing is set, in modulation signal period T, utilization transmits and carries out mixing to received signal, make transmit and received signal offset, avoid the passage saturation jamming, between the zero hour and the finish time that described received signal is handled, be in the single carrier period of transmission interval or emission period, utilize the single-carrier signal of emission to carry out mixing to received signal, directly obtain a low frequency signal, described low frequency signal is carried out demodulation, obtain electronic labeling information.
The present invention also provides a kind of R-T unit of realizing said method.Described appliance arrangement comprises microprocessor MCU, local oscillation circuit, the up-conversion modulation circuit, power amplification circuit (PA), with receiving frequently, send out antenna, described reader is set in the described microprocessor MCU to transmit the zero hour that period and received signal handle, the finish time, and handle to received signal according to this setting, also comprise simultaneously and be used to utilize two the low noise wave detectors carrying out mixing to received signal and be used for the low frequency signal that obtains after the described mixing is amplified of transmitting, differential signal amplifying circuit for described microprocessor MCU processing, the input of described two low noise wave detectors is connected to described with receiving frequently respectively by an electric capacity, send out the receiving terminal of antenna, differ 1/4 wavelength between two tie points of described electric capacity and antenna receiving terminal, the output of described two low noise wave detectors is connected respectively to the input of described differential signal amplifying circuit, and described differential signal amplifying circuit is connected with described microprocessor MCU.
Further, described differential signal amplifying circuit has two-stage.
Further, be connected with shaping circuit between described differential signal amplifying circuit and the described microprocessor MCU.
Beneficial effect of the present invention is as follows:
Same passage is received and dispatched in method and apparatus utilization of the present invention, and emission, reception carrier direct conversion subtract each other, and has overcome because the problem of the excessive barrage reception passage that transmits.Described method and apparatus effectively utilizes the characteristic of UHF rfid interrogator agreement simultaneously, utilizes its middle surrounding time section that transmits only to be the form of single carrier, carries out synchrodata and extracts, and efficiently handles Useful Information.
Description of drawings
Fig. 1 is the structured flowchart of R-T unit of the present invention;
Fig. 2 is the circuit theory diagrams of R-T unit of the present invention.
Embodiment
The following example is to further explanation of the present invention and explanation, and the present invention is not construed as limiting.
Method of the present invention is a kind of tupe of received signal, mainly utilizes the characteristics of UHF rfid interrogator agreement to solve the communication blocking problem.Method of the present invention, transmit in the receiving terminal utilization and to carry out direct conversion to received signal, obtain a low frequency signal, owing to issue a signal to inverse signal time interval of needs that reader receives label from reader, that is to say in the modulation signal period of the period that transmits T and do not have useful return information, do not handle the signal that obtains this moment, utilize this moment the effect of the mixing to received signal that transmits just to be embodied in the saturation jamming that prevents passage, and outside the modulation signal period of the period that transmits T, the beginning of just foregoing processing period and between the finish time, the firing order front and back that just in time are in the period that transmits are along in single carrier period t or the transmission interval, transmit this moment and only be single carrier, utilize this moment the emission single carrier to carry out mixing to received signal, will obtain a low frequency signal of only reconciling electronic labeling information, realize the zero intermediate frequency received signal, described low frequency signal is carried out demodulation, thereby obtain electronic labeling information.
Referring to accompanying drawing 1, R-T unit of the present invention comprises microprocessor MCU, local oscillation circuit, up-conversion modulation circuit, power amplification circuit (PA), the same antenna of sending and receiving frequently, connect the low noise wave detector at described receiving terminal with the frequency dual-mode antenna, the low noise wave detector is connected to microprocessor MCU by differential signal amplifying circuit and shaping circuit.In order better to handle to received signal, at receiving terminal two low noise wave detectors in parallel, and position phase difference of half wavelength, when the received signal of extracting by electric capacity when a low noise wave detector just in time is in trough like this, the signal that another wave detector extracts just in time is in crest, can prevent like this that received signal is too weak and the problem that can't demodulate information wherein occurs.Referring to accompanying drawing 2, low noise wave detector of the present invention adopts the HSMS2812 wave detector, and differential amplifier circuit adopts the MAT04 chip.In device provided by the invention, carry out time control by MCU, realize the direct zero intermediate frequency frequency conversion of signal on the one hand, can prevent the saturation jamming of passage simultaneously, specific as follows:
Read write line transmits by after the MCU compiling, according to the MCU firing order, after up-conversion, modulation, PA amplification, is launched by antenna, and this moment, signal was strong signal;
Electronic tag receives the signal from read write line, at first receive and gather energy, chip on the electronic tag is opened, and can demodulate from the command information in this signal, under the support of follow-up energy signal (single carrier) from read write line, its appointed information is launched in release, for the read write line receiving demodulation;
Reading and writing device antenna will receive under the signal from electronic tag and pass to the HSMS2812 wave detector, and the single carrier during the wave detector utilization transmits carries out mixing to the echo-signal that receives, and carries out multistage amplification by MAT04;
The information that MCU amplifies shaping according to the time set timesharing to the MAT04 demodulation of comparing obtains the information that is comprised in the electronic tag echo-signal.
Although by above implementation column the present invention is disclosed, scope of the present invention is not limited in the design of RFID and uses.Under the condition that does not depart from the present invention's design, more than make up available phase class device and substitute.
Claims (4)
1. the processing method of a received signal is characterized in that: comprising:
Reader period that transmits is defined as T+t, and wherein T is that modulation signal period, t are along the single carrier period before and after the firing order;
At the receiving terminal extraction two paths of signals that is coupled simultaneously: transmit and received signal;
Be the finish time of modulation signal period T the zero hour that the received signal processing is set, and be the zero hour of modulation signal period T the finish time that the received signal processing is set, in modulation signal period T, utilization transmits and carries out mixing to received signal, make transmit and received signal offset, avoid the passage saturation jamming, between the zero hour and the finish time that described received signal is handled, be in the single carrier period of transmission interval or emission period, utilize the single-carrier signal of emission to carry out mixing to received signal, directly obtain a low frequency signal, described low frequency signal is carried out demodulation, obtain electronic labeling information.
2. R-T unit of realizing the described method for processing received signal of claim 1, comprise microprocessor MCU, local oscillation circuit, the up-conversion modulation circuit, power amplification circuit (PA), with receiving frequently, send out antenna, it is characterized in that: reader is set in the described microprocessor MCU transmits the zero hour that period and received signal handle, the finish time, and handle to received signal according to this setting, also comprise simultaneously and be used to utilize two the low noise wave detectors carrying out mixing to received signal and be used for the low frequency signal that obtains after the described mixing is amplified of transmitting, differential signal amplifying circuit for described microprocessor MCU processing, the input of described two low noise wave detectors is connected to described with receiving frequently respectively by an electric capacity, send out the receiving terminal of antenna, differ 1/4 wavelength between two tie points of described electric capacity and antenna receiving terminal, the output of described two low noise wave detectors is connected respectively to the input of described differential signal amplifying circuit, and described differential signal amplifying circuit is connected with described microprocessor MCU.
3. R-T unit according to claim 2 is characterized in that: described differential signal amplifying circuit has two-stage.
4. R-T unit according to claim 2 is characterized in that: be connected with shaping circuit between described differential signal amplifying circuit and the described microprocessor MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010000667 CN102130700B (en) | 2010-01-15 | 2010-01-15 | Received signal processing method and implementation device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010000667 CN102130700B (en) | 2010-01-15 | 2010-01-15 | Received signal processing method and implementation device thereof |
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| Publication Number | Publication Date |
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| CN102130700A CN102130700A (en) | 2011-07-20 |
| CN102130700B true CN102130700B (en) | 2013-07-31 |
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| CN 201010000667 Expired - Fee Related CN102130700B (en) | 2010-01-15 | 2010-01-15 | Received signal processing method and implementation device thereof |
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| CN105718064A (en) * | 2016-01-22 | 2016-06-29 | 南京大学 | Gesture recognition system and method based on ultrasonic waves |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152976A (en) * | 1995-05-10 | 1997-06-25 | 罗克马诺尔研究有限公司 | Direct conversion receiver |
| US6259752B1 (en) * | 2000-02-01 | 2001-07-10 | Conexant Systems, Inc. | System for cancelling internal interference in a receiver |
| CN2831265Y (en) * | 2005-09-29 | 2006-10-25 | 中国电子科技集团公司第五十研究所 | Microwave module of roadside unit in electronic non-parking charging short-range communication system |
| CN101320419A (en) * | 2008-06-26 | 2008-12-10 | 桂林瀚特信息产业有限公司 | Ultrahigh frequency RFID label reader-writer |
-
2010
- 2010-01-15 CN CN 201010000667 patent/CN102130700B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152976A (en) * | 1995-05-10 | 1997-06-25 | 罗克马诺尔研究有限公司 | Direct conversion receiver |
| US6259752B1 (en) * | 2000-02-01 | 2001-07-10 | Conexant Systems, Inc. | System for cancelling internal interference in a receiver |
| CN2831265Y (en) * | 2005-09-29 | 2006-10-25 | 中国电子科技集团公司第五十研究所 | Microwave module of roadside unit in electronic non-parking charging short-range communication system |
| CN101320419A (en) * | 2008-06-26 | 2008-12-10 | 桂林瀚特信息产业有限公司 | Ultrahigh frequency RFID label reader-writer |
Non-Patent Citations (2)
| Title |
|---|
| 一种无源RFID无线射频识别系统的研究与设计;高小明;《RFID 射频识别》;20090705;第1页第3段-第3页第2段 * |
| 高小明.一种无源RFID无线射频识别系统的研究与设计.《RFID 射频识别》.2009,第1页第3段-第3页第2段. |
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| CN102130700A (en) | 2011-07-20 |
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Granted publication date: 20130731 Termination date: 20170115 |