CN103106418B - A kind of radio-frequency identification reader/writer - Google Patents
A kind of radio-frequency identification reader/writer Download PDFInfo
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- CN103106418B CN103106418B CN201110361533.9A CN201110361533A CN103106418B CN 103106418 B CN103106418 B CN 103106418B CN 201110361533 A CN201110361533 A CN 201110361533A CN 103106418 B CN103106418 B CN 103106418B
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Abstract
The invention provides a kind of radio-frequency identification reader/writer, including：Antenna element, emitter, receiver, digital baseband processor, interference information extraction module and elimination signal generation module；Emitter, electronic tag is sent to for the signal that handles digital baseband processor by antenna element；Receiver, also includes the signal of transmitter leaakage for being received by antenna element in the signal that electronic tag is launched, the signal that receiver is received；Interference information extraction module, for extracting the signal for including interference signal feature from the signal that receiver is received；Signal generation module is eliminated, noise source generation and the interference signal identical for the feature according to interference signal and system eliminate signal；Receiver, is additionally operable to, using the interference in the signal for eliminating the reception of signal cancellation receiver, eliminate the signal after interference and transfer to digital baseband processor to carry out subsequent treatment.The sensitivity for the radio-frequency identification reader/writer that the present invention is provided is greatly improved because of the elimination of interference.
Description
Technical field
The present invention relates to technical field of RFID, more particularly to a kind of radio-frequency identification reader/writer.
Background technology
Radio frequency identification is a kind of automatic identification technology that noncontact two-way communication is carried out by electromagnetic wave, can be applied to
The fields such as production, logistics, sale, management, service, such as storehouse management, commodity counterfeit prevention, transportation card, access card, identity card, animal
Management, library management, supply chain management, electronic entrance ticket etc..
The fundamental system of radio frequency identification includes electronic tag and radio-frequency identification reader/writer, and radio-frequency identification reader/writer is connect using non-
Tactile mode accesses one or more electronic tags.The electromagnetic wave transmission information electron that radio-frequency identification reader/writer is launched by it
Label, electronic tag is received after the electromagnetic wave that radio-frequency identification reader/writer is launched, and electricity is launched by reflection electromagnetic wave or active
The mode return information of magnetic wave is to radio-frequency identification reader/writer.Radio-frequency identification reader/writer generally comprises antenna, radio-frequency filter, transmitting-receiving
The functional modules such as isolator, emitter, receiver, digital signal processing module；Electronic tag generally comprises antenna, reception, modulation instead
Transmit-receive radio road, oscillator, digital signal processing module, memory etc..The simple and low-power consumption as far as possible that the circuit of electronic tag is designed,
To reduce the volume of electronic tag, and allow electronic tag by obtaining the electromagnetism wave energy that radio-frequency identification reader/writer is sent
Amount can just work without battery.
Radio-frequency identification reader/writer is while electronic tag return signal is received, it is necessary to which launching continuous carrier gives label conduct
Energy, because the isolation between the Receiver And Transmitter of RF Reader is limited, therefore radio-frequency identification reader/writer transmitting
Continuous carrier is by that can leak into receiver after emitter, the interference signal that the signal turns into receiver can cause receiver to hinder
Plug, makes reception distorted signals, because the interference signal intensity is very big, and positioned at reception channel middle；Meanwhile, the interference signal
In noise can also enter receiver, therefore the interference signal of transmitting-receiving leakage turns into limitation of radio frequency identification read write line sensitivity most
Main factor.
The content of the invention
In view of this, the invention provides a kind of radio-frequency identification reader/writer, the interference signal shadow to solve transmitting-receiving leakage
The problem of ringing radio-frequency identification reader/writer sensitivity, technical scheme is as follows：
A kind of radio-frequency identification reader/writer, including：Antenna element, emitter, receiver, digital baseband processor, interference letter
Cease extraction module and eliminate signal generation module.The emitter, the signal for digital baseband processor to be handled passes through day
Line unit is sent to electronic tag；The receiver, it is described to connect for receiving the signal that electronic tag is launched by antenna element
Also include interference signal in the signal that receipts machine is received, the interference signal is the signal of transmitter leaakage；The interference information is extracted
Module, the feature for extracting interference signal from the signal that receiver is received；The elimination signal generation module, for root
Noise source generation and interference signal identical elimination signal according to the feature and system of the interference signal；It is described to receive
Machine, is additionally operable to the interference signal in the signal using the elimination signal cancellation receiver reception, the letter after the elimination interference
Digital baseband processor number is transferred to carry out subsequent treatment.
The system noise sound source is emitter and/or local oscillator, and the elimination signal generation module is according to described dry
The feature of signal is disturbed, the elimination signal to eliminate interference is generated by emitter and/or local oscillator.
Further, the emitter includes：First D/A converter, emitter analogue baseband processors, up-conversion are mixed
Frequency device/modulator, power amplifier；First D/A converter, for digital baseband processor to be handled after numeral letter
Number it is converted into analog signal；The emitter analogue baseband processors, for being filtered to the analog signal, amplifying/decline
Subtract；Up-conversion mixer/the modulator, for becoming after being modulated to the signal after the processing of emitter analogue baseband processors
Change to radio frequency band；The power amplifier, for carrying out power by the signal after up-conversion mixer/modulators modulate
Amplification and Power Control.
Further, the receiver includes power combing module, down-conversion mixer/demodulator, receiver simulation base
Provided with processor and A/D converter；Down-conversion mixer/the demodulator, for achieving a butt joint, receipts machine is connect by antenna element
The down coversion of the radiofrequency signal of receipts, exports two-way baseband signal, respectively I roads signal and Q roads signal；The receiver simulates base
Provided with processor, for being filtered to the two-way baseband signal, amplification/attenuation；The A/D converter, for that will receive
Analog signal after the processing of machine analogue baseband processors is converted into data signal；The interference information extraction module, for from institute
The I component and Q component of interference signal are extracted in the two-way baseband signal for stating down-conversion mixer/demodulator output；It is described to disappear
Except signal generation module, the output for the I component and Q component according to the interference signal and the power amplifier of emitter is believed
Number generate the elimination signal to eliminate interference；The power combing module, signal is eliminated by directly by antenna for utilizing
Interference signal in the signal that unit is received is eliminated, and the signal after the elimination interference of the power combing module output transfers to lower change
Frequency mixer/demodulator carries out subsequent treatment.
Further, the receiver includes power combing module, down-conversion mixer/demodulator, receiver simulation base
Provided with processor, A/D converter and the second D/A converter；Down-conversion mixer/the demodulator, for the receipts that achieve a butt joint
The down coversion for the radiofrequency signal that machine is received, exports two-way baseband signal, respectively I roads signal and Q roads signal；The receiver
Analogue baseband processors, for being filtered to the two-way baseband signal, amplification/attenuation；The A/D converter, is used for
Analog signal after the processing of receiver analogue baseband processors is converted into data signal；The interference information extraction module, is used
The I component and Q component of interference signal are extracted in the data signal exported from the A/D converter；Second D/A
The data signal comprising the I component and Q component that converter is used to export interference information extraction module is converted into simulation letter
Number；The elimination signal generation module, the analog signal for being exported according to second D/A converter passes through local oscillations
Output signal generation and the interference signal identical of device eliminate signal；The power combing module, eliminating signal for utilization will
Interference signal in the signal directly received by antenna element is eliminated, after the elimination interference of the power combing module output
Signal transfers to down-conversion mixer/demodulator to carry out subsequent treatment.
Further, the receiver includes power combing module, down-conversion mixer/demodulator, receiver simulation base
Provided with processor and A/D converter；Down-conversion mixer/the demodulator, for achieving a butt joint, receipts machine is connect by antenna element
The down coversion of the radiofrequency signal of receipts, exports two-way baseband signal：I roads signal and Q roads signal；The receiver ABB processing
Device, for entering filtering, amplification/attenuation to the signal after down coversion；The A/D converter, for by receiver ABB
Analog signal after processor processing is converted into data signal；The interference information extraction module, for from down-conversion mixer/
The amplitude and phase of interference signal are extracted in reception signal before demodulator processes；The elimination signal generation unit, is used
In the amplitude and phase according to the interference signal and the generation of the output signal of the power amplifier of emitter and interference signal
Identical eliminates signal；The power combing module, the signal that signal will be received directly by antenna element is eliminated for utilizing
In interference signal eliminate, the signal after the elimination interference of power combing module output transfers to down-conversion mixer/demodulation
Device carries out subsequent treatment.
Further, the receiver includes down-conversion mixer/demodulator, signal synthesizing module, receiver simulation base
Provided with processor and A/D converter；Down-conversion mixer/the demodulator, for achieving a butt joint, receipts machine is connect by antenna element
The down coversion of the radiofrequency signal of receipts, exports two-way baseband signal, respectively I roads signal and Q roads signal；The receiver simulates base
Provided with processor, for entering filtering, amplification/attenuation to the signal after down coversion；The A/D converter, for by receiver mould
Intend the analog signal after baseband processor and be converted into data signal；The interference information extraction module, for from described two
The I component and Q component of interference signal are extracted in roadbed band signal；The elimination signal generation module, for being believed according to interference
Number I component and the output signal of Q component and emitter generate elimination signal to eliminate interference；The signal synthesizes mould
Block, for using the interference signal in the signal for eliminating the reception of signal cancellation receiver, what the signal synthesizing module was exported to disappear
Except the signal after interference transfers to receiver analogue baseband processors to carry out subsequent treatment.
Further, the receiver includes down-conversion mixer/demodulator, signal synthesizing module, receiver simulation base
Provided with processor, A/D converter and the second D/A converter；Down-conversion mixer/the demodulator, for the receipts that achieve a butt joint
The down coversion for the radiofrequency signal that machine is received by antenna element, exports two-way baseband signal, respectively I roads signal and Q roads signal；
The receiver analogue baseband processors, for entering filtering, amplification/attenuation to the signal after down coversion；The analog/digital conversion
Device, for the analog signal after the processing of receiver analogue baseband processors to be converted into data signal；The interference information is extracted
Module, for extracting I component and Q component in the data signal that is exported from the A/D converter；Second D/A turns
The data signal that parallel operation is used to export interference information extraction module is converted into analog signal；The elimination signal generation module,
Disappear for the analog signal exported according to the second D/A converter and the output signal generation of emitter with interference signal identical
Except signal；The signal synthesizing module, doing in the signal that signal receives receiver by antenna element is eliminated for utilizing
Signal elimination is disturbed, the signal after the elimination interference of the signal synthesizing module output transfers to receiver analogue baseband processors to carry out
Subsequent treatment.
Further, the power combing module is coupler, adder or power splitter.
Described radio-frequency identification reader/writer, in addition to low-noise amplifier, the low-noise amplifier, for receiver
The signal of reception enters line amplitude adjustment, and to adapt to the demand of unlike signal intensity, the output signal of the low-noise amplifier is sent
Enter down-conversion mixer/demodulator and carry out subsequent treatment.
The radio-frequency identification reader/writer that the present invention is provided is by interference information extraction module, in the signal that receiver is received
The feature extraction of interference signal comes out, and the interference signal is signal of the transmitter leaakage to receiver, eliminates signal generation module
One is produced according to interference signal feature and system noise sound source with interference signal identical and eliminates signal, by the elimination signal from connecing
The follow-up reception processing of receiver is carried out after being eliminated in the collection of letters number again, the interference that such emitter is introduced just is eliminated, meanwhile, do
The noise for disturbing signal also declines with the elimination of interference, therefore the sensitivity of radio-frequency identification reader/writer is greatly improved.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
The structural representation for the radio-frequency identification reader/writer that Fig. 1 provides for the present invention；
Fig. 2 is the structural representation for the radio-frequency identification reader/writer that the embodiment of the present invention one is provided；
Fig. 3 realizes block diagram for the interference information extraction module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention one；
Fig. 4 realizes block diagram for the elimination signal generation module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention one；
Fig. 5 realizes block diagram for the power combing module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention one；
Fig. 6 is the structural representation for the radio-frequency identification reader/writer that the embodiment of the present invention two is provided；
Fig. 7 realizes block diagram for the interference information extraction module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention two；
Fig. 8 realizes block diagram for the elimination signal generation module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention two；
Fig. 9 realizes block diagram for the power combing module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention two；
Figure 10 is the structural representation for the radio-frequency identification reader/writer that the embodiment of the present invention three is provided；
Figure 11 realizes block diagram for the interference information extraction module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention three；
Figure 12 realizes block diagram for the elimination signal generation module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention three；
Figure 13 realizes block diagram for the power combing module of the radio-frequency identification reader/writer of the offer of the embodiment of the present invention three；
Figure 14 is the structural representation for the radio-frequency identification reader/writer that the embodiment of the present invention four is provided；
Figure 15 is the structural representation for the radio-frequency identification reader/writer that the embodiment of the present invention five is provided.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is the structural representation of radio-frequency identification reader/writer of the present invention, including：Digital baseband processor 11,
Emitter 12, antenna element 13, receiver 14, interference information extraction module 15 and elimination signal generation module 16.
Emitter 12, electron mark is sent for the signal that handles digital baseband processor 11 by antenna element 13
Label；Receiver 14, is also wrapped for being received by antenna element 13 in the signal that electronic tag is launched, the signal that receiver 14 is received
Interference signal is included, the interference signal is the signal that emitter 12 is leaked；Interference information extraction module 15, for being connect from receiver 14
Interference signal feature is extracted in the signal of receipts；Signal generation module 16 is eliminated, for the feature and system according to interference signal
Noise source generation with interference signal identical eliminate signal；Receiver 14, is additionally operable to using eliminating signal cancellation receiver 14
Interference signal in the signal of reception, eliminates the signal after interference and transfers to digital baseband processor 11 to carry out subsequent treatment.It is above-mentioned
System noise sound source is emitter 12 and/or local oscillator.
Above-mentioned radio-frequency identification reader/writer eliminates the process disturbed：Receiver 14 receives the reception signal for including interference, does
The feature that information extraction modules 15 extract interference signal in signal is received is disturbed, signal generation module 16 is eliminated according to interference information
The noise source generation of interference signal feature and system that extraction module 15 is extracted eliminates signal with interference signal identical, receives
Machine 14 will receive signal and subtract the elimination signal that elimination signal generation module 16 is generated, to offset the interference received in signal,
After interference is eliminated, signal proceeds follow-up reception processing.
The radio-frequency identification reader/writer that the present invention is provided is by interference information extraction module, in the signal that receiver is received
The feature extraction of interference signal comes out, and the interference signal is signal of the transmitter leaakage to receiver, eliminates signal generation module
One and interference signal identical elimination signal are generated according to interference signal feature and system noise sound source, receiver utilizes the elimination
Signal will be disturbed and eliminated from signal is received, and the interference that such emitter is introduced just is eliminated, meanwhile, the noise of interference signal
Decline with the elimination of interference, therefore, the sensitivity of radio-frequency identification reader/writer is greatly improved.
The radio-frequency identification reader/writer that the present invention is provided can be carried out for the elimination of interference signal in radio frequency band, also can be in base
Band frequency range is carried out, and interference information can be extracted in analog signal, can also extracted in a digital signal.
Present disclosure is described below by several specific embodiments, wherein, in embodiment one, two, three,
The extraction of interference information is carried out in radio frequency band, and in example IV, five, the extraction of interference information is entered in base band frequency range
OK.Further, in embodiment one, three, interference information is extracted in the analog signal that receiver is received, in embodiment two
In, interference information is extracted in a digital signal；In example IV, interference information is extracted in analog signal, in embodiment five
In, interference information is extracted in a digital signal.Wherein, interference information is the feature of interference signal.
Embodiment one
Referring to Fig. 2, Fig. 2 is the concrete structure schematic diagram for the radio-frequency identification reader/writer that the embodiment of the present invention one is provided, including：
Digital baseband processor 101, emitter (including：First D/A converter 102, emitter analogue baseband processors 103, upper change
Frequency mixer/modulator 104, power amplifier 105), antenna element 106, receiver (including：Power combing module 107, under
Conversion mixer/demodulator 108, receiver analogue baseband processors 109, A/D converter 110), interference information extraction module
111 and eliminate signal generation module 112.
First D/A converter 102, for digital baseband processor 101 to be handled after data signal be converted into simulation
Signal；Emitter analogue baseband processors 103, for being filtered to the analog signal that the first D/A converter 102 is exported,
Amplification/attenuation；Up-conversion mixer/modulator 104, for entering to the signal after the processing of emitter analogue baseband processors 103
Row DSB/SSB/PR-ASK etc. is modulated, and the signal after modulation transforms to radio frequency band；Power amplifier 105, after to modulation
Signal carry out power amplification and Power Control；The signal that power amplifier 105 is exported is launched by antenna element 106.
Down-conversion mixer/demodulator 108, the down coversion for the radiofrequency signal for the receipts that achieve a butt joint；Receiver simulates base
Provided with processor 109, for being filtered to the analog signal after down coversion, amplification/attenuation；A/D converter 110, for inciting somebody to action
Analog signal after the processing of receiver analogue baseband processors 109 is converted into data signal, the number that A/D converter 110 is exported
Word signal feeding digital baseband processor 101 carries out subsequent treatment.
Interference information extraction module 111, for extracting interference signal feature from the signal that receiver is received；Eliminate letter
Number generation module 112, disappears for the interference signal feature according to extraction and the generation of system noise sound source with interference signal identical
Except signal；Power combing module 107, is eliminated for that will be disturbed according to elimination signal from signal is received.
Down-conversion mixer/demodulator 108 achieve a butt joint receipts radiofrequency signal quadrature frequency conversion, output two-way base band letter
Number, respectively I roads signal and Q roads signal, wherein, I roads signal is in-phase signal, and Q roads signal is orthogonal signalling；Interference information is carried
Modulus block 111 obtains the I component and Q component of interference signal by this two paths of signals.Radio-frequency identification reader/writer is returned in reception label
During the signal returned, read write line transmitting continuous carrier gives tag-powered, and now the I component of transmission signal and Q component keep constant, do
Disturb signal same.Therefore the characteristic signal extracted needed for interference information extraction module is DC quantity (not changing over time),
It needs to provide enough gains for direct current signal to realize less residual after stable eliminate.In the present embodiment, interference letter
Cease the implementation of extraction module 111 and I roadbeds are taken a message as shown in figure 3, being realized using integrator I 1111 and integrator Q1112
Number and Q roadbed band signals in direct current signal extraction and amplification, while suppressing other signals and interference.The present embodiment is not limited
The implementation of interference information extraction module 111 is determined, as long as the implementation used can be realized to I roadbeds band signal and Q roads
The extraction of direct current signal in baseband signal.
In the present embodiment, the implementation of signal generation module 112 is eliminated as shown in figure 4, the power amplification of emitter
The energy that device 108 is exported is separated by coupler 1 is partly into elimination signal generation module 112, and the signal passes through 0 °/90 °
The signal of 90 ° of the generation two-way of phase shifter 1121 phase difference enters up-conversion mixer/quadrature modulator 1122, while interference information
The signal that extraction module 111 is exported also inputs up-conversion mixer/quadrature modulator 1122 to control orthogonal two paths of signals
Amplitude, up-conversion mixer/quadrature modulator 1122 just obtains required elimination signal after the completion of modulating, the elimination signal is sent
Enter power combing module 107 and carry out interference elimination.
Eliminate signal generation module 112 and generate one and interference signal identical elimination signal, elimination signal feeding work(
Rate synthesis module 107 carries out interference elimination.Eliminate under being carried out in signal feeding down-conversion mixer/demodulator 108 after interference
Only included after a small amount of eliminate in frequency conversion, output I roadbeds band signal and Q roadbed band signals, I roadbeds band signal and Q roadbed band signals
The interference of residual, now elimination signal is constant, realizes that lasting interference is eliminated, meanwhile, eliminate the two-way baseband signal after interference
After feeding receiver analogue baseband processors 109 are adjusted, data signal, feeding numeral are converted into by A/D converter 102
BBP 101 carries out subsequent treatment.In the present embodiment, system noise sound source is emitter, and the present embodiment, which is not limited, is
System noise source is emitter, or local oscillator can also be local oscillator and emitter.
In the present embodiment, interference information is extracted in being the analog signal received from receiver, and interference is eliminated
It is to be carried out in radio frequency band, eliminates the I for the interference signal that signal generation module 112 is extracted according to interference information extraction module 111
The signal generation that the power amplifier 105 of component and Q component and emitter is exported and interference signal identical radiofrequency signal, should
Radiofrequency signal feeding power combing module 107 carries out interference elimination.Interference information extraction module 111 needs to realize to interference signal
The extraction of feature, and after the completion of interference is eliminated, remain as elimination signal generation module 112 and current interference information is provided,
Realize that lasting interference is eliminated.
In the present embodiment, as shown in figure 5, power combing module 107 is realized using power splitter 1071.The present embodiment is not
Power limitation synthesis module 107 is realized by power splitter 1071, can also be realized by coupler or adder, as long as used
Implementation method can will disturb the elimination from signal is received using signal is eliminated.
When needing to be amplified the signal that receiver is received, i.e., when receiver inlet signal/interference magnitude is smaller,
Low-noise amplifier, low-noise amplifier can be added between power combing module 107 and down-conversion mixer/demodulator 108
For entering line amplitude adjustment to the signal that receiver is received, to adapt to the demand of unlike signal intensity.
Embodiment two
Referring to Fig. 6, Fig. 6 is the concrete structure block diagram for the radio-frequency identification reader/writer that the embodiment of the present invention two is provided, including：Number
Word BBP 201, emitter (including：First D/A converter 202, emitter analogue baseband processors 203, up-conversion
Frequency mixer/modulator 204, power amplifier 205), antenna element 206, emitter (including：Power combing module 207, lower change
Frequency mixer/demodulator 208, receiver analogue baseband processors 209, A/D converter 210), interference information extraction module
211st, the second D/A converter 212 and elimination signal generation module 213.
The difference of embodiment two and embodiment one is that interference information is extracted in a digital signal, therefore, and interference information is carried
Modulus block 211, the feature for extracting interference signal in the two ways of digital signals that is exported from A/D converter 210, accordingly
, embodiment adds the second D/A converter 212, the data signal for interference information extraction module 211 to be exported turns
Change analog signal into；Signal generation module 212 is eliminated, interference signal is included for what is exported according to the second D/A converter 212
The generation of analog signal and system noise sound source and the interference signal identical of I component and Q component eliminate signal；Power combing module
207, eliminated for that will be disturbed according to elimination signal from signal is received.Interference information in A/D converter 210 except that can export
Data signal in extract outside, also can from digital baseband processor 201 processing after data signal in extract.
In the present embodiment, interference information extraction module 211 implementation as shown in fig. 7, using wave filter I 2111,
Wave filter Q 2112, amplifier I 2113 and amplifier Q 2114, are realized to direct current in I roadbeds band signal and Q roadbed band signals
The extraction and amplification of signal, while suppressing other signals and interference, the filtered device I 2111 of I roadbed band signals is sent into after filtering
Amplifier I 2113 is amplified, and feeding amplifier I 2114 is amplified after the filtered device I 2112 of Q roadbed band signals is filtered.
The present embodiment does not limit the implementation of interference information extraction module, as long as the implementation used can be realized to I roadbeds
The extraction of direct current signal in band signal and Q roadbed band signals.
In the present embodiment, the implementation of signal generation module 213 is eliminated as shown in figure 8, being carried using local oscillator 2
For 90 ° of signal, the signal enters up-conversion mixer/quadrature modulator 2131, while interference information extraction module 211 is exported
Data signal through the second D/A converter 212 be converted into simulation new number after also input up-conversion mixer/quadrature modulator
2131 amplitude to control orthogonal two paths of signals, up-conversion mixer/quadrature modulator 2131 just obtains institute after the completion of modulating
The elimination signal needed, elimination signal feeding power combing module 207 carries out interference elimination.In the present embodiment, system noise
Sound source is local oscillator 2, and the present embodiment does not limit system noise sound source as local oscillator 2, or emitter, can also be
Local oscillator and emitter.
Eliminate signal generation module 213 and generate one and interference signal identical elimination signal, elimination signal feeding work(
Rate synthesis module 207 carries out interference elimination.Eliminate under being carried out in signal feeding down-conversion mixer/demodulator 208 after interference
No longer comprising disturbing in frequency conversion, output I roadbeds band signal and Q roadbed band signals, I roadbeds band signal and Q roadbed band signals, now
Elimination signal is constant, realizes that lasting interference is eliminated, meanwhile, eliminate the two-way baseband signal feeding receiver after interference and simulate base
After provided with processor 209 is handled, data signal is converted into by A/D converter 210, feeding digital baseband processor 201 enters
Row subsequent treatment.
In the present embodiment, as shown in figure 9, power combing module 207 is realized using coupler 2071.The present embodiment is not
Power limitation synthesis module 207 is realized by coupler 2071, can also be realized by power splitter, adder, as long as used
Method can eliminate interference from signal is received.
When needing to be amplified the signal that receiver is received, i.e., when receiver inlet signal/interference magnitude is smaller,
Low-noise amplifier, low-noise amplifier can be added between power combing module 207 and down-conversion mixer/demodulator 208
For entering line amplitude adjustment to the signal that receiver is received, to adapt to the demand of unlike signal intensity.
Embodiment three
Referring to Figure 10, Figure 10 is the concrete structure block diagram for the radio-frequency identification reader/writer that the embodiment of the present invention three is provided, including：
Digital baseband processor 301, emitter (including：First D/A converter 302, emitter analogue baseband processors 303, upper change
Frequency mixer/modulator 304, power amplifier 305), antenna element 306, receiver (including：Power combing module 307, under
Conversion mixer/demodulator 308, receiver analogue baseband processors 309, A/D converter 310), interference information extraction module
311 and eliminate signal generation module 312.
The difference of embodiment three and embodiment one is that interference information is before input up-conversion mixer/modulator 304
Reception signal in extract, and extract interference information be interference signal amplitude and phase.That is interference information extraction module
311, amplitude and phase for extracting interference signal from the reception signal of receiver；Signal generation module 312 is eliminated, is used
In the amplitude and phase according to interference signal and the generation of system noise sound source signal is eliminated with interference signal identical；Power combing
Module 107, for according to the elimination from signal is received by interference signal of elimination signal.
Radio-frequency identification reader/writer is when receiving the signal that label is returned, and read write line transmitting continuous carrier gives tag-powered, this
When transmission signal amplitude and phase keep it is constant, interference signal is same, thus interference information extraction module needed for extract
Interference signal feature be amplitude and phase (not changing over time).In the present embodiment, interference information extraction module 311
Implementation as shown in figure 11, realized by amplitude detection module 3111 and phase detecting module 3112 to interference signal amplitude and
The extraction of phase information.
In the present embodiment, the implementation for eliminating signal generation module 312 is as shown in figure 12, the power amplification of emitter
The energy that device 305 is exported is separated by coupler 3 is partly into elimination signal generation module 312, while interference information is extracted
The signal that module 311 is exported also inputs elimination signal generation module 312, passes through amplitude control module 311 and phase control module
312 control just obtains required elimination signal, and elimination signal feeding power combing module 307 carries out interference elimination.
In the present embodiment, system noise sound source is the output signal of emitter, and the present embodiment does not limit system noise sound source as emitter,
It can be local oscillator, can also be local oscillator and emitter.
Eliminate signal generation module 312 and generate one and interference signal identical elimination signal, elimination signal feeding work(
Rate synthesis module 307 carries out interference elimination.Eliminate under being carried out in signal feeding down-conversion mixer/demodulator 308 after interference
No longer comprising interference in frequency conversion, output I roadbeds band signal and Q roadbed band signals, I roadbeds band signal and Q roadbed band signals, eliminate
After two-way baseband signal feeding receiver analogue baseband processors 309 after interference are adjusted, by 310 turns of A/D converter
Change data signal into, feeding digital baseband processor 301 carries out subsequent treatment.
In the present embodiment, the use adder 3071 of power combing module 307 as shown in figure 13 passes through current/voltage phase
Plus method realize.The implementation method of the present embodiment not power limitation synthesis module 307, will as long as passing through used method
Interference signal is eliminated.
When needing to be amplified the signal that receiver is received, i.e., when receiver inlet signal/interference magnitude is smaller,
Low-noise amplifier, low-noise amplifier can be added between power combing module 307 and down-conversion mixer/demodulator 308
For realizing the amplitude adjustment to input signal, to adapt to the demand of varying input signal intensity.
Example IV
Referring to Figure 14, Figure 14 is the concrete structure block diagram for the radio-frequency identification reader/writer that the embodiment of the present invention four is provided, this hair
The radio-frequency identification reader/writer that bright embodiment is provided includes：Digital baseband processor 401, emitter (including：First D/A switch
Device 402, emitter analogue baseband processors 403, up-conversion mixer/modulator 404, power amplifier 405), antenna element
406th, receiver (including：Down-conversion mixer/demodulator 407, signal synthesizing module 408, receiver analogue baseband processors
409th, A/D converter 410), interference information extraction module 411 and eliminate signal generation module 412.
In the present embodiment, interference information extraction module 411, for down-conversion mixer/demodulator 407 from receiver
The feature of interference signal is extracted in signal after down coversion；Signal generation module 412 is eliminated, for the spy according to interference signal
Seek peace emitter transmission signal generation with interference signal identical eliminate signal；Signal synthesizing module 408, for according to elimination
Signal eliminates interference signal from signal is received.Signal feeding after the elimination interference that signal synthesizing module 408 is exported is received
After machine analogue baseband processors 409 are handled, data signal is converted into by A/D converter 410, digital base band processor is sent into
Device 401 carries out subsequent treatment.In the present embodiment, interference information is extracted in analog signal, and the elimination of interference signal is in base band
Frequency range is carried out.
When needing to be amplified the signal that receiver is received, i.e., when receiver inlet signal/interference magnitude is smaller,
Low-noise amplifier can be added between antenna element 406 and down-conversion mixer/demodulator 407, low-noise amplifier is used for
Enter line amplitude adjustment to the signal that receiver is received, to adapt to the demand of unlike signal intensity.
Embodiment five
Referring to Figure 15, Figure 15 is the concrete structure block diagram for the radio-frequency identification reader/writer that the embodiment of the present invention five is provided, including：
Digital baseband processor 501, the first D/A converter 502, emitter analogue baseband processors 503, up-conversion mixer/tune
Device 504 processed, power amplifier 505, antenna element 506, down-conversion mixer/demodulator 507, signal synthesizing module 508, reception
Machine analogue baseband processors 509, A/D converter 510, interference information extraction module 511, the second D/A converter 512 and disappear
Except signal generation module 513.
The difference of the present embodiment and example IV is that interference information is extracted in baseband digital signal, i.e. interference information
Extraction module 511, the feature for extracting interference signal in the data signal that is exported from the A/D converter 510 of receiver；
Accordingly, embodiment adds the second D/A converter 512, the numeral for interference information extraction module 511 to be exported is believed
Number it is converted into analog signal；Signal generation module 513 is eliminated, interference is included for what is exported according to the second D/A converter 512
The analog signal of signal characteristic and the transmission signal generation of emitter eliminate signal with interference signal identical；Signal synthesizing module
508, for according to the elimination from signal is received by interference signal of elimination signal.
Signal feeding receiver analogue baseband processors 509 after the elimination interference that signal synthesizing module 508 is exported are carried out
After processing, data signal is converted into by A/D converter 510, feeding digital baseband processor 501 carries out subsequent treatment.Interference
Information extraction modules 511 need to realize the extraction to interference signal feature, and after the completion of interference is eliminated, remain as elimination letter
Number generation module 513 provides current interference information, realizes that lasting interference is eliminated.Interference information is except can be in analog/digital conversion
Outside being extracted in the data signal that device 510 is exported, it can also be extracted from the data signal after the processing of digital baseband processor 501.
When needing to be amplified the signal that receiver is received, i.e., when receiver inlet signal/interference magnitude is smaller,
Low-noise amplifier can be added between antenna element 506 and down-conversion mixer/demodulator 507, low-noise amplifier is used for
Enter line amplitude adjustment to the signal that receiver is received, to adapt to the demand of unlike signal intensity.
What the embodiment of each in this specification was stressed is all the difference with other embodiment, each embodiment it
Between identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (1)
1. a kind of radio-frequency identification reader/writer, it is characterised in that including：Antenna element, emitter, receiver, digital base band processor
Device, interference information extraction module and elimination signal generation module；
The emitter, for the signal of digital baseband processor processing output to be sent into electron mark by antenna element
Label；
The receiver, for receiving the signal that the electronic tag is launched by the antenna element, the receiver is received
Signal in also include interference signal, the interference signal be the transmitter leaakage signal；
The interference information extraction module, the feature for extracting interference signal in the signal that is received from the receiver；
The elimination signal generation module, the noise source generation for the feature according to the interference signal and system is done with described
Disturb signal identical and eliminate signal；
The receiver, is additionally operable to eliminate the interference signal in the signal that the receiver is received, institute using the elimination signal
Stating the signal eliminated after interference transfers to the digital baseband processor to carry out subsequent treatment；
The system noise sound source is emitter and/or local oscillator, and the elimination signal generation module is believed according to the interference
Number feature, elimination signal of the signal generation exported using the emitter and/or local oscillator to eliminate interference；
The emitter includes：First D/A converter, emitter analogue baseband processors, up-conversion mixer/modulator,
Power amplifier；
First D/A converter, for the data signal after digital baseband processor processing to be converted into simulation letter
Number；
The emitter analogue baseband processors, for being filtered to the analog signal, amplification/attenuation；
Up-conversion mixer/the modulator, for being adjusted to the signal after emitter analogue baseband processors processing
Radio frequency band is transformed to after system；
The power amplifier, for carrying out power amplification by the signal after the up-conversion mixer/modulators modulate
And Power Control；
The receiver include power combing module, down-conversion mixer/demodulator, receiver analogue baseband processors and mould/
Number converter；
Down-conversion mixer/the demodulator, the lower change of the radiofrequency signal received for the receipts machine that achieves a butt joint by antenna element
Frequently, two-way baseband signal, respectively I roads signal and Q roads signal are exported；
The receiver analogue baseband processors, for being filtered to the two-way baseband signal, amplification/attenuation；
The A/D converter, for the analog signal after the processing of receiver analogue baseband processors to be converted into digital letter
Number；
The interference information extraction module, for being carried from the two-way baseband signal of the down-conversion mixer/demodulator output
Take out the I component and Q component of interference signal；
The elimination signal generation module, puts for the I component and Q component and the power of emitter according to the interference signal
The output signal of big device generates the elimination signal to eliminate interference；
The power combing module, for being eliminated using the interference signal in the elimination signal signal that receives receiver,
Signal after the elimination interference of the power combing module output transfers to down-conversion mixer/demodulator to carry out subsequent treatment；
The receiver includes power combing module, down-conversion mixer/demodulator, receiver analogue baseband processors, analog
Converter and the second D/A converter；
Down-conversion mixer/the demodulator, the lower change of the radiofrequency signal received for the receipts machine that achieves a butt joint by antenna element
Frequently, two-way baseband signal, respectively I roads signal and Q roads signal are exported；
The receiver analogue baseband processors, for being filtered to the two-way baseband signal, amplification/attenuation；
The A/D converter, for the analog signal after the processing of receiver analogue baseband processors to be converted into data signal；
The interference information extraction module, for extracting interference signal in the data signal that is exported from the A/D converter
I component and Q component；
Second D/A converter is used for the numeral comprising the I component and Q component for exporting interference information extraction module
Signal is converted into analog signal；
The elimination signal generation module, shakes for the analog signal exported according to second D/A converter and locally
The output signal generation for swinging device eliminates signal with interference signal identical；
The power combing module, for utilizing the interference eliminated in the signal that signal will be received directly by antenna element
Signal is eliminated, and the signal after the elimination interference of the power combing module output is transferred to after down-conversion mixer/demodulator progress
Continuous processing；
The receiver include power combing module, down-conversion mixer/demodulator, receiver analogue baseband processors and mould/
Number converter；
Down-conversion mixer/the demodulator, the lower change of the radiofrequency signal received for the receipts machine that achieves a butt joint by antenna element
Frequently, two-way baseband signal, respectively I roads signal and Q roads signal are exported；
The receiver analogue baseband processors, for entering filtering, amplification/attenuation to the signal after down coversion；
The A/D converter, for the analog signal after the processing of receiver analogue baseband processors to be converted into data signal；
The interference information extraction module, for being extracted from the reception signal before down-conversion mixer/demodulator processes
The amplitude and phase of interference signal；
The elimination signal generation unit, for the amplitude and phase according to the interference signal and the power amplification of emitter
Output signal generation and the interference signal identical of device eliminate signal；
The power combing module, it is described for being eliminated using the interference signal eliminated in the signal that signal receives receiver
Signal after the elimination interference of power combing module output transfers to down-conversion mixer/demodulator to carry out subsequent treatment；
The receiver include down-conversion mixer/demodulator, signal synthesizing module, receiver analogue baseband processors and mould/
Number converter；
Down-conversion mixer/the demodulator, the lower change of the radiofrequency signal received for the receipts machine that achieves a butt joint by antenna element
Frequently, two-way baseband signal, respectively I roads signal and Q roads signal are exported；
The receiver analogue baseband processors, for entering filtering, amplification/attenuation to the signal after down coversion；
The A/D converter, for the analog signal after the processing of receiver analogue baseband processors to be converted into data signal；
The interference information extraction module, I component and Q point for extracting interference signal from the two-way baseband signal
Amount；
The elimination signal generation module, for the I component and Q component and the output signal of emitter according to the interference signal
Generate the elimination signal to eliminate interference；
The signal synthesizing module, for the interference signal in the signal using the elimination signal cancellation receiver reception, institute
Stating the signal after the elimination interference of signal synthesizing module output transfers to receiver analogue baseband processors to carry out subsequent treatment；
The receiver includes down-conversion mixer/demodulator, signal synthesizing module, receiver analogue baseband processors, analog
Converter and the second D/A converter；
Down-conversion mixer/the demodulator, the lower change of the radiofrequency signal received for the receipts machine that achieves a butt joint by antenna element
Frequently, two-way baseband signal, respectively I roads signal and Q roads signal are exported；
The receiver analogue baseband processors, for entering filtering, amplification/attenuation to the signal after down coversion；
The A/D converter, for the analog signal after the processing of receiver analogue baseband processors to be converted into data signal；
The interference information extraction module, for extracting interference signal in the data signal that is exported from the A/D converter
I component and Q component；
The data signal that second D/A converter is used to export interference information extraction module is converted into analog signal；
The elimination signal generation module, for the analog signal exported according to the second D/A converter and the output of emitter
Signal generation eliminates signal with interference signal identical；
The signal synthesizing module, for the interference signal in the signal using the elimination signal cancellation receiver reception, institute
Stating the signal after the elimination interference of signal synthesizing module output transfers to receiver analogue baseband processors to carry out subsequent treatment；
The power combing module is coupler, adder or power splitter；
Described radio-frequency identification reader/writer also includes low-noise amplifier, the low-noise amplifier, for the receiver
The signal of reception enters line amplitude adjustment, and to adapt to the demand of unlike signal intensity, the output signal of the low-noise amplifier is sent
Enter down-conversion mixer/demodulator and carry out subsequent treatment.
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| CN201110361533.9A CN103106418B (en) | 2011-11-15 | 2011-11-15 | A kind of radio-frequency identification reader/writer |
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| CN201110361533.9A CN103106418B (en) | 2011-11-15 | 2011-11-15 | A kind of radio-frequency identification reader/writer |
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| CN103106418B true CN103106418B (en) | 2017-10-03 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103530681B (en) * | 2013-10-09 | 2017-01-11 | 煤炭科学技术研究院有限公司 | System and method for detecting mining product information |
| US20170063427A1 (en) * | 2015-08-27 | 2017-03-02 | Qualcomm Incorporated | Analog interference cancelation for shared antennas |
| DE102015114541A1 (en) * | 2015-08-31 | 2017-03-02 | Intel IP Corporation | A receiver and method for reducing a distortion component within a baseband receive signal |
| CN105978569B (en) * | 2016-06-16 | 2020-03-27 | 北京中科国技信息系统有限公司 | Radio frequency identification signal processing method, circuit and device and label reader-writer |
| CN108596793A (en) * | 2018-06-27 | 2018-09-28 | 东阳市人民医院 | A kind of free meal intelligent settlement system and its implementation |
| CN111327349B (en) * | 2018-12-12 | 2021-08-24 | 航天信息股份有限公司 | Vehicle identification method and RFID reader-writer |
| CN109714816B (en) * | 2018-12-21 | 2021-08-10 | 武汉万集信息技术有限公司 | Power adjustment method, device and system for motor vehicle electronic identification read-write equipment |
| US10735035B1 (en) * | 2019-03-11 | 2020-08-04 | Apple Inc. | Sensor circuit with tracking filter and leakage rejection |
| CN112968710A (en) * | 2019-12-13 | 2021-06-15 | 航天信息股份有限公司 | Multi-band radio frequency circuit |
| CN113938147B (en) * | 2021-09-28 | 2022-10-21 | 杭州电子科技大学 | Method for eliminating strong electromagnetic interference signal leaked by transmitter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119121A (en) * | 2007-08-21 | 2008-02-06 | 华为技术有限公司 | Anti-interference method in receiver, anti-interference receiver and anti-interference device |
| CN101409581A (en) * | 2008-11-07 | 2009-04-15 | 武汉虹信通信技术有限责任公司 | Apparatus and method for reducing wireless discharging-directly station antenna insulated degree requirement |
| CN101425823A (en) * | 2007-11-01 | 2009-05-06 | 西门子公司 | Self-interference signal eliminating apparatus and method and RFID reader-writer |
| CN101453228A (en) * | 2007-12-04 | 2009-06-10 | 松下电器产业株式会社 | Common station address interference elimination system and method |
-
2011
- 2011-11-15 CN CN201110361533.9A patent/CN103106418B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119121A (en) * | 2007-08-21 | 2008-02-06 | 华为技术有限公司 | Anti-interference method in receiver, anti-interference receiver and anti-interference device |
| CN101425823A (en) * | 2007-11-01 | 2009-05-06 | 西门子公司 | Self-interference signal eliminating apparatus and method and RFID reader-writer |
| CN101453228A (en) * | 2007-12-04 | 2009-06-10 | 松下电器产业株式会社 | Common station address interference elimination system and method |
| CN101409581A (en) * | 2008-11-07 | 2009-04-15 | 武汉虹信通信技术有限责任公司 | Apparatus and method for reducing wireless discharging-directly station antenna insulated degree requirement |
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|---|---|
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