CN103595431B - Can be used for transceiver and the noise cancellation method of radio frequency identification - Google Patents
Can be used for transceiver and the noise cancellation method of radio frequency identification Download PDFInfo
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- CN103595431B CN103595431B CN201210286702.1A CN201210286702A CN103595431B CN 103595431 B CN103595431 B CN 103595431B CN 201210286702 A CN201210286702 A CN 201210286702A CN 103595431 B CN103595431 B CN 103595431B
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Abstract
Embodiments of the invention provide a kind of transceiver and the noise cancellation method that can be used for radio frequency identification.The transceiver disclosed includes a reflector, a receiver and a noise eliminator.This reflector can in order to send a carrier signal to an antenna.This receiver can in order to receive a wireless signal from this antenna.According to the part of this carrier signal, this noise eliminator produces a feedback current, and an input of this receiver of feed-in, eliminates the noise in this wireless signal.This noise eliminator, according to the signal strength signal intensity of noise in this wireless signal, adjusts this feedback current.
Description
Technical field
The present invention is relevant to a kind of wireless telecommunication system and method, and espespecially one can in radio frequency identification, is used for the transceiver of stress release treatment and method.
Background technology
Radio frequency identification (radio frequency identification, referred to as RFID) be one of most important front ten large technology in 21st century, the system that usual needs are made up of inductor (Reader) and RFID label tag (Tag), as shown in Figure 1.The principle of RFID running utilizes inductor 10 to launch radio wave, RFID label tag 12 within the scope of touch inducing, by electromagnetic induction generation current, the chip in supply RFID label tag 12 operates and sends wireless signal responds (backscatter) inductor 10.
With the difference of driving-energy source, RFID label tag can be divided into active and passive type two kinds.The label of passive type itself does not have the device of battery, and required electric energy produces by the radio wave electromagnetic induction of inductor entirely, so only receiving the response inductor that signal that inductor sends just can be passive.Active label is built-in with battery, and can initiatively read for inductor by transmission signal, the ratio passive type that signal transmits scope also relative is wide.
RFID label tag 12, when responding inductor 10, is generally with the carrier signal after ovennodulation, transmits message.Now, inductor 10 still can send not through the carrier signal of ovennodulation, in order to supply the power supply of passive label.
Fig. 2 shows the framework in inductor 10.The carrier signal Cx that major part reflector 14 sends, will be transmitted in environment through antenna 18.But there is a little unmatched problem of impedance in reality, the carrier signal Cx of fraction will be reflected by antenna 18, shown in the reflection carrier signal CRx in Fig. 2.Together with the wireless signal Rx that reflection carrier signal CRx will receive with antenna 18, through coupler (coupler) 20, received device 16 received.Compared to desired wireless signal Rx, reflection carrier signal CRx equivalence is exactly noise, should restrains or eliminate.
Fig. 3 shows the frequency spectrum of reflection carrier signal CRx and wireless signal Rx.Inductor 10 is difficult to the carrier signal Cx sending absolute cleanliness (only having single-tone), how much has phase noise (phase noise).Therefore, the frequency spectrum reflecting carrier signal CRx can with carrier frequency f
cxcentered by and launch.The result of modulation, wireless signal Rx is roughly that (its frequency is the carrier frequency f of carrier signal Cx with two sounds (tone)
cxplus-minus Δ f) formed, as shown in Figure 3.
The existence of reflection carrier signal CRx can reduce the signal to noise ratio (SNR) of receiver 16 at receiving terminal.Once reflection carrier signal CRx is excessive, as shown in Figure 3, wireless signal Rx just may be submerged under reflection carrier signal CRx, and cannot be identified.
Therefore, how can eliminate or inhibitory reflex carrier signal CRx, be exactly the target that industry is made great efforts.The mode of most intuition reduces an impedance mismatch, directly reduces the energy reflecting carrier signal CRx.But this method needs the impedance matching of high accurancy and precision, the manufacturing cost of inductor will be increased significantly.
Summary of the invention
In view of this, the object of the invention is to, propose a kind of transceiver and the noise cancellation method that can be used for radio frequency identification, its part according to carrier signal produces a feedback current, eliminates the noise in wireless signal.
One embodiment of the invention provide a kind of transceiver that can be used for radio frequency identification, include a reflector, a receiver and a noise eliminator.This reflector can in order to send a carrier signal to an antenna.This receiver can in order to receive a wireless signal from this antenna.According to the part of this carrier signal, this noise eliminator produces a feedback current, and an input of this receiver of feed-in, eliminates the noise in this wireless signal.This noise eliminator, according to the signal strength signal intensity of the noise in this wireless signal, adjusts this feedback current.
One embodiment of the invention provide a kind of method of stress release treatment, are applied to the transceiver of radio frequency identification, include: send a carrier signal to an antenna; A wireless signal is received from this antenna; With the part of this carrier signal, produce a feedback current, an input of this receiver of feed-in; And, according to the signal strength signal intensity of the noise in this wireless signal, adjust this feedback current, to eliminate the noise in this wireless signal.
In order to have better understanding to above-mentioned and other aspect of the present invention, preferred embodiment cited below particularly, and coordinating accompanying drawing, being described in detail below:
Accompanying drawing explanation
Fig. 1 shows a kind of known radio frequency identification system.
Fig. 2 shows the framework of the inductor in Fig. 1.
Fig. 3 shows the frequency spectrum of reflection carrier signal CRx and wireless signal Rx.
Fig. 4 shows a kind of transceiver calcspar that can be used for radio frequency identification according to the invention process.
Some signals in Fig. 5 exemplary graph 4 phase place each other and strength relationship.
Fig. 6 illustrates one more and organizes phase generator.
Fig. 7 illustrates a programmable current generator.
Main element symbol description
Embodiment
Fig. 4 shows a kind of transceiver calcspar that can be used for radio frequency identification (RFID) according to the invention process.As shown in Figure 4, transceiver 60 includes an inductor 62, antenna 64 and some Individual elements (discreteelement).
The digital communications that inductor 62 can will transmit by reflector 66, changes through digital analog converter 68 and after blender 70 raising frequency, through transmitting terminal TX, power amplifier 72, coupler 74, is transmitted in environment with antenna 64.The carrier signal that after the modulation that blender 70 hybrid digital analog converter 68 exports, signal and local oscillator provide.
Receiver 76 include low noise amplifier (low noise amplifier, referred to as LNA) 78, blender 80, with analog-digital converter 84.The received wireless signal sent by RFID label tag of antenna 64, experienced by coupler 74, Balanced or unbalanced transducer (balun) 86 and receiving terminal RX, received by receiver 76.Handling procedure such as experience frequency reducing, Analog-digital Converter etc., receiver 76 provides corresponding digital signal to give digital signal controller 88.
When reflector 66 through transmitting terminal TX, power amplifier 72, coupler 74, with antenna 64 launch carrier signal Cx time, the carrier signal Cx of part can be reflected by antenna 64 and become reflection carrier signal CRx, for the received wireless signal from RFID label tag, reflection carrier signal CRx is exactly noise, should restrain or eliminate.If do not have suitable process, the noise that reflection carrier signal CRx is such, will be comprised in wireless signal, and through coupler 74, Balanced or unbalanced transducer 86 and receiving terminal RX, received device 76 received.
Inductor 62 also has noise eliminator 90, and object is the noise eliminating or suppress to comprise in the wireless signal that receiving terminal RX receives, and namely reflects carrier signal CRx, increases signal to noise ratio.Noise eliminator 90 includes organizes phase generator (multiphase generator) 92, programmable current generator (programmable current generator) 94, power detector 96 and analog-digital converter 98 more.
The carrier signal Cx of part, through coupler 74 and Balanced or unbalanced transducer 100, will arrive at carrier wave and eliminate end CC, become carrier cancellation signal CCx.Just because of carrier cancellation signal CCx is a part of carrier signal Cx with reflection carrier signal CRx, just live through different bang paths, so carrier cancellation signal CCx and reflection carrier signal CRx institute difference, approximately only have signal phase and signal strength signal intensity.Some signals in Fig. 5 exemplary graph 4 phase place each other and strength relationship.In Figure 5, assuming that carrier cancellation signal CCx is seated in fourth quadrant, and reflects carrier signal CRx and be positioned at first quartile.
Based on carrier cancellation signal CCx, many group phase generators 92 can provide several to wherein a pair in basis signal.For Fig. 5, many group phase generators 92 can produce basis signal to (2LO
0, 2LO
90), (-2LO
0, 2LO
90), (-2LO
0,-2LO
90) and (2LO
0,-2LO
90), be seated two borders of first quartile in Fig. 5, the second quadrant, third quadrant and fourth quadrant respectively.At this, 2LO
0for falling behind first basis signal of carrier cancellation signal CCx, 2LO
90for falling behind 2LO
0there is pi/2 radian, by that analogy.
What these four pairs of basis signal represented is four phase relations that basis signal follows carrier cancellation signal CCx.According to polar signal IS and QS, many group phase generators 92 can, from four pairs of basis signal, be selected to export to programmable current generator 94 for a pair.For example, at point sometime, polar signal IS and the QS that digital signal controller 88 provides is in logic 1, so many group phase generators 92 provide basis signal to (-2LO
0,-2LO
90) give programmable current generator 94.
In one embodiment, programmable current generator 94 is a transducer (transconductor), according to two magnification ratio gm
iwith gm
q, received basis signal to converting relative offset current to II
fBwith IQ
fB, converge and be made into feedback current I
fB, the input of feed-in receiver 76, namely receiving terminal RX.Digital signal controller 88 provides multiplying power control signal IGM and QGM to decide magnification ratio gm
iwith gm
q.
For Fig. 5, programmable current generator 94 respectively basis signal to (-2LO
0,-2LO
90) be converted linearly into corresponding offset current to II
fBwith IQ
fB.Feedback current I
fBfor offset current is to II
fBwith IQ
fBvector sum.In Figure 5, feedback current I
fBapproximately the reverse of reflection carrier signal CRx, so feedback current I
fBalmost can offset reflection carrier signal CRx completely, noise is eliminated at this point.
Power detector 96 detects the signal strength signal intensity of noise in the wireless signal on receiving terminal RX, namely reflects the intensity of carrier signal CRx, produces received signal strength index (received signal strength index, referred to as RSSI).According to received signal strength index, digital signal controller 88 can upgrade multiplying power control signal IGM and QGM, and polar signal IS and QS, uses adjustment feedback current I
fB.Digital signal controller 88 can in have an optimization computing, find out best multiplying power control signal and polar signal, make received signal strength index be minimum.
For example, the permutation and combination of all possible multiplying power control signal IGM and QGM and polar signal IS and QS can produce once by digital signal controller 88, produces all corresponding feedback current I
fB, and record all corresponding received signal strength indexs.
Wherein, the multiplying power control signal corresponding with minimum received signal strength index and polar signal are exactly the best multiplying power control signal and polar signal.The best multiplying power control signal and polar signal can allow the sonic reflection carrier signal CRx that makes an uproar, roughly all by feedback current I
fBoffset.Digital signal controller 88 can remember the best multiplying power control signal and polar signal, as used during normal running, eliminate reflection carrier signal CRx, increases the signal to noise ratio on receiving terminal RX.
Fig. 6 illustrates organizes phase generator 92 more, and it includes polyphase filters (polyphase filter) 102 and polarity selector 104.Based on carrier cancellation signal CCx (be made up of carrier cancellation signal CCx_P and the CCx_N balanced), polyphase filters 102 produces four local signal LO
0, LO
90, LO
180, and LO
270, each local signal falls behind previous local signal and is about pi/2 radian.Polarity selector 104 has two identical circuit 104I and 104Q.
Explain orally for circuit 104I, when polar signal IS is 0, basis signal CC_IB equals local signal LO
0deduct local signal LO
180, so equal 2*LO
0.Contrary, when polar signal IS is 1, basis signal CC_IB equals local signal LO
180deduct local signal LO
0, so equal-2*LO
0.Similar, in this embodiment, basis signal CC_QB can equal 2*LO
90or-2*LO
90, depending on polar signal QS.
Therefore, according to polar signal IS and QS, the basis signal that many group phase generators 92 provide can be that four basis signal are to (2LO to (CC_IB, CC_QB)
0, 2LO
90), (-2LO
0, 2LO
90), (-2LO
0,-2LO
90) and (2LO
0,-2LO
90) one of them.Although in the embodiment in fig 6, often pair of basis signal is orthogonal each other, and the present invention is not limited to this.In other embodiments, often pair of basis signal each other can be non-orthogonal.
Fig. 7 illustrates programmable current generator 94, has identical transducer 106I and 106Q.For transducer 106I, it receives basis signal CC_IB, produces offset current II
fB, and multiplying power control signal IGM determines magnification ratio gm
i(=II
fB/ CC_IB).Similar, multiplying power control signal QGM determines magnification ratio gmQ.Offset current II
fBwith offset current IQ
fBconverge whole after, become feedback current I
fB, the anode RX_P of feed-in receiving terminal RX.Contrary, feedback current I
fBfeed out the negative terminal RX_N of receiving terminal RX.The feed-in of electric current with feed out, as long as by the output of transducer 106I and 106Q, it is just passable that direct wire is connected to receiving terminal RX, very simple on circuit.
From Fig. 5,6 and 7, polar signal IS and QS have selected basis signal to correspond in several phase relations of carrier cancellation signal CCx one of them, roughly determine feedback current I
fBbe arranged in which quadrant of Fig. 5; Multiplying power control signal IGM and QGM roughly determines feedback current I
fBangle (phase place) in the quadrant selected by polar signal and length (intensity).Digital signal controller 88 in Fig. 4 can find out best multiplying power control signal and polar signal, makes received signal strength index be minimum, allows feedback current I
fBroughly payment reflection carrier signal CRx.
From the embodiment of Fig. 4 also, no matter whether the impedance of antenna 64 mates accurately, digital signal controller 88 can produce suitable feedback current I with adapting to
fB, offset issuable reflection carrier signal CRx.
In sum, although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is defined by claims and is as the criterion.
Claims (12)
1., for a transceiver for radio frequency identification, include:
One reflector, in order to send a carrier signal to an antenna;
One receiver, has an input, in order to receive the wireless signal from this antenna via this input; And
One noise eliminator, according to the part of this carrier signal, produces a feedback current, this input of this receiver of feed-in, and according to the signal strength signal intensity of noise in this wireless signal, adjusts this feedback current, to eliminate this noise in this wireless signal;
This noise eliminator includes:
Organize phase generator one more, according to this part of this carrier signal, a pair basis signal with a predetermined phase relationship must be produced, wherein, this predetermined phase relationship be multiple phase relation one of them; And
One programmable current generator, according to this to basis signal, produces this feedback current, this input of this receiver of feed-in.
2. transceiver as claimed in claim 1, it is characterized in that, this many groups phase generator includes:
One polyphase filters, based on this part of this carrier signal, produces the local signal of leggy; And
One selector, according to one first polar signal, with the difference of a pair local signal in the local signal of this leggy, as this to one of basis signal basis signal, and according to one second polar signal, with the difference of another in the local signal of this leggy to local signal, as this another basis signal to basis signal.
3. transceiver as claimed in claim 1, it is characterized in that, this programmable current generator, by this to the basis signal of two in basis signal respectively with two magnification ratios, convert a pair offset current to, together this input of feed-in, and, this programmable current generator receives two multiplying power control signals, decides this two magnification ratios.
4. transceiver as claimed in claim 1, it is characterized in that, this is pi/2 radian to basis signal phase difference each other.
5. transceiver as claimed in claim 1, it is characterized in that, this transceiver separately includes:
One digital signal controller, provides an optimization computing, controls this noise eliminator, to minimize this noise in this wireless signal.
6. transceiver as claimed in claim 5, is characterized in that, this digital signal controller remembers the multiplying power control signal and polar signal that this optimization computing obtains, as used during normal running.
7. a method for stress release treatment, is applied to the transceiver of a radio frequency identification, includes:
One carrier signal is sent to an antenna;
A wireless signal is received from this antenna;
Multiple phase relation is provided;
According to the part of this carrier signal, produce a pair basis signal, wherein, this to basis signal meet these phase relations one of them;
According to this to basis signal, produce a feedback current, an input of feed-in one receiver; And
According to the signal strength signal intensity of noise in this wireless signal, adjust this feedback current, to eliminate the noise in this wireless signal.
8. the method for stress release treatment as claimed in claim 7, is characterized in that, include:
According to this part of this carrier signal, produce the local signal of leggy;
With the difference of a pair local signal in the local signal of this leggy, as this to one of basis signal basis signal; And
With the difference of another in the local signal of this leggy to local signal, as this another basis signal to basis signal.
9. the method for stress release treatment as claimed in claim 7, is characterized in that, include:
Bipolarity signal is provided, in order to select these phase relations one of them.
10. the method for stress release treatment as claimed in claim 7, is characterized in that, include:
According to this part of this carrier signal, produce a pair basis signal; And
Change this to basis signal, become a pair offset current, together this input of feed-in.
11. noise cancellation methods as claimed in claim 10, is characterized in that, include:
There is provided two magnification ratios to change this respectively to two of basis signal basis signal, become this to offset current; And
According to an optimization computing, carry out these magnification ratios of optimization, to minimize the noise in this wireless signal.
12. noise cancellation methods as claimed in claim 11, is characterized in that, include:
Obtain multiplying power control signal and polar signal by this optimization computing, and remember this multiplying power control signal and polar signal, as used during normal running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210286702.1A CN103595431B (en) | 2012-08-13 | 2012-08-13 | Can be used for transceiver and the noise cancellation method of radio frequency identification |
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|---|---|---|---|
| CN201210286702.1A CN103595431B (en) | 2012-08-13 | 2012-08-13 | Can be used for transceiver and the noise cancellation method of radio frequency identification |
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| CN103595431B true CN103595431B (en) | 2015-09-02 |
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| CN105007127A (en) * | 2015-07-10 | 2015-10-28 | 成都弘毅天承科技有限公司 | Level shift driving power detection radio frequency module for smart home |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101201891A (en) * | 2006-12-12 | 2008-06-18 | 财团法人工业技术研究院 | Rfid reader and circuit and method for echo cancellation thereof |
| WO2008092283A1 (en) * | 2007-01-29 | 2008-08-07 | Elektrobit Wireless Communicatons Ltd. | Device and method for suppressing a transmitted signal in a receiver of an rfid writing/reading device |
| CN101888252A (en) * | 2010-04-20 | 2010-11-17 | 宁波成电泰克电子信息技术发展有限公司 | Method and system for improving dynamic range in RF system |
| CN102480308A (en) * | 2010-11-23 | 2012-05-30 | 天津中兴软件有限责任公司 | Method for restraining carrier leak |
-
2012
- 2012-08-13 CN CN201210286702.1A patent/CN103595431B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101201891A (en) * | 2006-12-12 | 2008-06-18 | 财团法人工业技术研究院 | Rfid reader and circuit and method for echo cancellation thereof |
| WO2008092283A1 (en) * | 2007-01-29 | 2008-08-07 | Elektrobit Wireless Communicatons Ltd. | Device and method for suppressing a transmitted signal in a receiver of an rfid writing/reading device |
| CN101888252A (en) * | 2010-04-20 | 2010-11-17 | 宁波成电泰克电子信息技术发展有限公司 | Method and system for improving dynamic range in RF system |
| CN102480308A (en) * | 2010-11-23 | 2012-05-30 | 天津中兴软件有限责任公司 | Method for restraining carrier leak |
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Effective date of registration: 20201023 Address after: No. 1, Xingzhu Road, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road China science and Technology Development Institute of Technology Park Building No. three tower 4-5 No. Patentee before: Mstar Semiconductor,Inc. Patentee before: MEDIATEK Inc. Effective date of registration: 20201023 Address after: No.4-5 tower building, No.3, scientific research and Development Park, Chinese Academy of science and technology development, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Mstar Semiconductor,Inc. Patentee after: MEDIATEK Inc. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road China science and Technology Development Institute of Technology Park Building No. three tower 4-5 No. Patentee before: Mstar Semiconductor,Inc. Patentee before: MSTAR SEMICONDUCTOR Inc. |
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