CN101452520A - Signal processor for receiving wireless radio frequency identification signal and method thereof - Google Patents
Signal processor for receiving wireless radio frequency identification signal and method thereof Download PDFInfo
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- CN101452520A CN101452520A CNA2007101947333A CN200710194733A CN101452520A CN 101452520 A CN101452520 A CN 101452520A CN A2007101947333 A CNA2007101947333 A CN A2007101947333A CN 200710194733 A CN200710194733 A CN 200710194733A CN 101452520 A CN101452520 A CN 101452520A
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Abstract
The invention relates to a signal processing device for receiving wireless radio-frequency identification signals, which comprises a first low-pass filter, a first down sampler, a first comparator and a first waveform converter, wherein the first low-pass filter is used for filtering high-frequency parts of the wireless radio-frequency identification signals; the first down sampler performs down sampling on filtered signals; the first comparator generates signals for judging signal value according to sampled signals; and the first waveform converter converts the signal waveform of the signals for judging the signal value, so as to match the signals with subsequent operation.
Description
Technical field
The present invention relates to a kind of apparatus and method that are used for receiving wireless radio frequency identification signal, and more particularly, relate to a kind of apparatus and method of utilizing signal processing method with the identification wireless radio frequency identification signal.
Background technology
(radio-frequency identification, RFID) technology is a kind of RFID of utilization label to radio frequency identification, by the transmitting-receiving of radio frequency signal, to realize the technology of identification automatically.The system of radio frequency identification generally is made up of RFID label and RFID identification equipment.Described label is launched identification signal on one's own initiative or is received the signal of described identification equipment passively and produce identification signal, and receives described identification signal to reach the purpose of identification by described identification equipment.Because the convenience of radio RF recognition technology, it is mainly used in enterprise supply chain management, for example tracking of products and warehousing management at present.For example highway toll, passport system, vehicle management, animal tag, body implant and books stock arrangement are its applicable field for other.
The receiving end of general RFID identification equipment is to add that through low-pass filter comparer judges the value of described identification signal.Yet described comparer is only with threshold value benchmark as a comparison, and described identification signal can be subjected to the various factors influence and change its waveform or amplitude, and then influences the performance of described identification equipment.For example described RFID label at high temperature can cause the rise time (rising time) of described identification signal to prolong, or when long distance or surrounding environment are too complicated, having too much noise, described signal then has bias voltage when the bit rate of described identification signal is higher.Above-mentioned interference all can cause the discrimination of described radio frequency identification system to descend, can only be with lower bit rate operation or limit described system.(the Electronic Product Code of electric product coding association, EPC) at present the RFID bit rate of defined has five kinds of 40kbps, 80kbps, 160kbps, 320kbps and 640kbps, yet the radio frequency identification system of utilization said apparatus can only be operated below 80kbps.Therefore be necessary to be used to promote the discrimination of radio frequency identification system and the apparatus and method of bit rate at receiving end design one cover of radio frequency identification system.
Summary of the invention
Fundamental purpose of the present invention is with method for processing signals identification wireless radio frequency identification signal and then promotes discrimination.
The signal processing apparatus that is applied to receiving wireless radio frequency identification signal of the first embodiment of the present invention comprises: first low-pass filter, first time sampler, first comparer and first waver.Described first low-pass filter is in order to the HFS of the described wireless radio frequency identification signal of filtering.Described first time sampler descended sampling to described signal through filtering.Described first comparer according to the signal of described sampling produce in order to judge signal value first through comparison signal.And described first waver is changed its signal waveform to cooperate subsequent operation with described first through comparison signal.
The device that is applied to receiving wireless radio frequency identification signal of the second embodiment of the present invention comprises: analog-to-digital converter, signal processing apparatus and the microprocessor of first embodiment as described.Described analog-to-digital converter receives the artificial antenna radio frequency identification signal, and is converted into the digital wireless radio frequency identification signal.The described signal processing apparatus of first embodiment as described receives described digital wireless radio frequency identification signal, and carries out Signal Processing.And described microprocessor receives the signal that signal processing apparatus produced of described first embodiment as described to carry out signal Processing.
The method that is applied to receiving wireless radio frequency identification signal of the third embodiment of the present invention comprises the following step: receiving wireless radio frequency identification signal; Wireless radio frequency identification signal to described reception carries out low-pass filtering; Described wireless radio frequency identification signal through filtering is descended sampling; The wireless radio frequency identification signal and the ideal signal of described sampling are compared, to produce in order to judge the signal of high low value; And be converted to square-wave signal in order to the signal of judging high low value according to its value with described.
According to the device that is applied to receiving wireless radio frequency identification signal of the present invention, the device of corresponding general wireless radio frequency identification signal, its reception and transmission range increases to eight meters for from three to four meters, and the bit rate of described wireless radio frequency identification signal also can be promoted to 640kbps from 80kbps.Therefore under the situation of same identification rate, its reception and transmission range of device of the present invention and bit rate all can significantly promote.
Description of drawings
Fig. 1 shows the device that is applied to receiving wireless radio frequency identification signal of the first embodiment of the present invention;
Fig. 2 shows the signal processing apparatus that is applied to receiving wireless radio frequency identification signal of the second embodiment of the present invention; And
Fig. 3 shows the process flow diagram of the method that is applied to receiving wireless radio frequency identification signal of the third embodiment of the present invention.
Embodiment
Fig. 1 shows the device that is applied to receiving wireless radio frequency identification signal of the first embodiment of the present invention.Described device 101 comprises analog-to-digital converter 102, signal processing unit 103, microprocessor 104 and oscillator 105.Described analog-to-digital converter 102 receives the artificial antenna radio frequency identification signal of two phase phasic differences, 90 degree, and is converted into the digital wireless radio frequency identification signal of two phase phasic differences, 90 degree.Described signal processing apparatus 103 is in order to carry out the higher computing of time clock, and it receives described signal through conversion, and described signal is carried out filtering and processing relatively, to produce square wave to microprocessor 104.Microprocessor 104 is responsible for the low and higher computing of level of time clock, and oscillator 105 produces the signal of high time clock so that the clock pulse signal as analog-to-digital converter 102 and signal processing apparatus 103 to be provided.
Fig. 2 shows the signal processing apparatus that is applied to receiving wireless radio frequency identification signal of the second embodiment of the present invention.Described device is the signal processing unit 103 of Fig. 1.Signal processing apparatus 103 is implemented in field programmable gate array (fieldprogrammable gate array, FPGA) on, and comprise first low-pass filter 201, first time sampler 202, first comparer 203, first waver 204, first demoder 205, first power calculator 206, signal selector 207, storer 208, second low-pass filter 209, second time sampler 210, second comparer 211, second waver 212, second demoder 213 and second power calculator 214.Wherein first low-pass filter 201, first time sampler 202, first comparer 203, first waver 204, first demoder 205 and first power calculator 206 are handled first wireless radio frequency identification signal accordingly.And second low-pass filter 209, second time sampler 210, second comparer 211, second waver 212, second demoder 213 and second power calculator 214 are handled second wireless radio frequency identification signal with 90 degree of phasic difference mutually of first wireless radio frequency identification signal accordingly.The function of described two groups of circuit is identical, and corresponding signal difference.
First low-pass filter 201 and second low-pass filter 209 utilize the method for moving average (moving average) to carry out low-pass filtering, and in order to the HFS of filtering wireless radio frequency identification signal.First time sampler 202 and second time sampler 210 are descended sampling (downsampling) with described signal through filtering, its objective is the signal that sampling under the signal of different bit rate is become identical number of samples.For example take a sample with the wireless radio frequency identification signal of time clock 20.48MHz bit rate 40kbps, the sampling spot of then described each symbol of signal (symbol) is 512 points, if and take a sample with the wireless radio frequency identification signal of same time clock bit rate 640kbps, then the sampling spot of each symbol is 32 points.Therefore the signal of 210 pairs of different bit rate of first time sampler 202 and second time sampler descends sampling to make that its number of samples is identical, to cooperate the subsequent operation unit.For example the wireless radio frequency identification signal of bit rate 40kbps is done 1/16 following sampling, and the wireless radio frequency identification signal of 80kbps is carried out 1/8 following sampling, and the wireless radio frequency identification signal of 640kbps is not taken a sample down, and the rest may be inferred.First comparer 203 and second comparer 211 are matched filter (match filter), and its signal and ideal signal with described sampling compares, with produce in order to judge signal value first through relatively with second through comparison signal.First waver 204 and second waver 212 comprise first local maximum respectively and seek unit 2041 and first pulse to square wave converter 2042 and second local maximum and seek unit 2121 and second pulse to square wave converter 2122.First local maximum seeks unit 2041 and maximum value is looked in second local maximum searching unit 2121 between the sampling spot of each symbol, is height (high) or low (low) to judge described symbol.First pulse is square wave (square) signal to square wave converter 2042 and second pulse to square wave converter 2122 with pulse (pulse) conversion of signals of the described maximum value of having found out, to cooperate subsequent operation.First demoder 205 and second demoder 213 are decoded the signal of first waver 204 and 212 outputs of second waver respectively according to the standard of electric product coding association, its fundamental purpose is to be responsible for the higher decoding action of time clock, with the burden of the microprocessor 104 that reduces Fig. 1.First power calculator 206 and second power calculator 214 calculate respectively wireless radio frequency identification signal and with the power of the signal of 90 degree of phasic difference mutually of described wireless radio frequency identification signal, and signal selector 207 selects the power higher signal so that subsequent operation to be provided according to the result of calculation of first power calculator 206 and second power calculator 214 from described two wireless radio frequency identification signals.First power calculator 206 and second power calculator 214 also can be merged into single power calculator, and described power calculator timesharing calculate wireless radio frequency identification signal and with the power of the signal of 90 degree of phasic difference mutually of described wireless radio frequency identification signal.Storer 206 in order to store described device through the signal of computing so that follow-up hardware to be provided, for example microprocessor 104 carries out computing.
Fig. 3 shows the process flow diagram of the method that is applied to receiving wireless radio frequency identification signal of the third embodiment of the present invention.In step 301, receive the RFID signal of two phase phasic differences, 90 degree.In step 302, the RFID signal of described reception is carried out low-pass filtering.In step 303, descend sampling through the RFID of filtering signal to described.In step 304, the RFID signal and the ideal signal of described sampling compared, to produce in order to judge the signal of high low value.In step 305, be converted to square-wave signal in order to the signal of judging high low value according to its value with described.In step 306, (Electronic Product Code, standard EPC) is decoded according to electric product coding association with described square-wave signal.In step 307,, and select decoded result correct and have the signal of its square-wave signal of more powerful RFID signal as follow-up computing according to the decoded result and the watt level of described two RFID signals.
According to the device that is applied to receiving wireless radio frequency identification signal of the present invention, the device of corresponding general wireless radio frequency identification signal, its reception and transmission range increases to eight meters for from three to four meters, and the bit rate of described wireless radio frequency identification signal also can be promoted to 640kbps from 80kbps.Therefore under the situation of same identification rate, its reception and transmission range of device of the present invention and bit rate all can significantly promote.
Technology contents of the present invention and technical characterstic disclose as above, yet the those skilled in the art still may be based on teaching of the present invention and announcement and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by appending claims.
Claims (25)
1, a kind of signal processing apparatus that is used for receiving wireless radio frequency identification signal is characterized in that comprising:
First low-pass filter, the HFS of the described wireless radio frequency identification signal of its filtering;
First time sampler, it descends sampling to described signal through filtering;
First comparer, its according to signal of described sampling produce in order to judge signal value first through comparison signal; And
First waver, the described waveform of its conversion in order to the signal of judging signal value.
2, signal processing apparatus according to claim 1 is characterized in that further comprising:
Second low-pass filter, it is in order to the HFS of filtering with the signal of 90 degree of phasic difference mutually of described wireless radio frequency identification signal;
Second time sampler, its signal to the described second low-pass filter filtering descends sampling;
Second comparer, its signal according to described second time sampler sampling produce in order to judge signal value second through comparison signal; And
Second waver, it changes the waveform of the signal of described second comparer generation.
3, signal processing apparatus according to claim 2 is characterized in that further comprising:
First power calculator, it calculates the power of described wireless radio frequency identification signal;
Second power calculator, it calculates the power of the signal of spending with the phasic difference mutually 90 of described wireless radio frequency identification signal; And
Signal selector, its result of calculation according to described first power calculator and described second power calculator is got the signal of higher-wattage.
4, signal processing apparatus according to claim 2 is characterized in that further comprising:
Power calculator, the power of the signal that its phasic difference mutually 90 of calculating described wireless radio frequency identification signal and described wireless radio frequency identification signal is spent; And
Signal selector, its result of calculation according to described power calculator is got the signal of higher-wattage.
5, signal processing apparatus according to claim 1 is characterized in that further comprising:
First demoder, its standard according to electric product coding association is decoded to the signal of described first waver output.
6, signal processing apparatus according to claim 2 is characterized in that further comprising:
Second demoder, its standard according to electric product coding association is decoded to the signal of described second waver output.
7, signal processing apparatus according to claim 1 is characterized in that further comprising:
Storer, it is in order to store the signal through computing of described device.
8, signal processing apparatus according to claim 1 is characterized in that wherein said first low-pass filter utilizes the method for moving average to implement low-pass filtering.
9, signal processing apparatus according to claim 2 is characterized in that wherein said second low-pass filter utilizes the method for moving average to implement low-pass filtering.
10, signal processing apparatus according to claim 1 is characterized in that wherein said first comparer is a matched filter, and its signal and ideal signal with described sampling compares, to produce described first through comparison signal.
11, signal processing apparatus according to claim 2 is characterized in that wherein said second comparer is a matched filter, and its signal and ideal signal with described sampling compares, to produce described second through comparison signal.
12, signal processing apparatus according to claim 1 is characterized in that wherein said first waver further comprises:
First local maximum is sought the unit, and it is in order to seek described local maximum in order to the signal of judging signal value; And
First pulse is to the square wave converter, and it judges that according to described local maximum described first numerical value through comparison signal is high or low, to produce square wave to cooperate subsequent operation.
13, signal processing apparatus according to claim 2 is characterized in that wherein said second waver further comprises:
Second local maximum is sought the unit, and it is in order to seek described local maximum in order to the signal of judging signal value; And
Second pulse is to the square wave converter, and it judges that according to described local maximum described second numerical value through comparison signal is high or low, to produce square wave to cooperate subsequent operation.
14, signal processing apparatus according to claim 1 is characterized in that wherein said first time sampler becomes sampling under the signal of different bit rate the signal of identical number of samples.
15, method according to claim 2 is characterized in that wherein said second time sampler becomes sampling under the signal of different bit rate the signal of identical number of samples.
16, signal processing apparatus according to claim 14, the signal that it is characterized in that wherein said different bit rate is meant the signal of 40kbps, 80kbps, 160kbps, 320kbps and 640kbps.
17, signal processing apparatus according to claim 1 is characterized in that wherein said signal processing apparatus is implemented on the field programmable gate array.
18, a kind of device that is used for receiving wireless radio frequency identification signal is characterized in that comprising:
Analog-to-digital converter, it receives the artificial antenna radio frequency identification signal, and is converted into the digital wireless radio frequency identification signal;
Signal processing apparatus according to claim 1, it receives described digital wireless radio frequency identification signal, and carries out signal Processing; And
Microprocessor, its signal that receives described signal processing apparatus generation is to carry out signal Processing.
19, device according to claim 18, it is characterized in that wherein said analog-to-digital converter receives the artificial antenna radio frequency identification signal of two phase phasic differences, 90 degree, and be converted into the digital wireless radio frequency identification signal of two phase phasic differences, 90 degree.
20, device according to claim 18 is characterized in that further comprising:
Oscillator, its in order to the signal that produces high time clock so that the clock pulse signal as described analog-to-digital converter and described signal processing apparatus to be provided.
21, device according to claim 18 is characterized in that device wherein according to claim 1 is implemented on the field programmable gate array.
22, a kind of method that is used for receiving wireless radio frequency identification signal is characterized in that comprising the following step:
Receiving wireless radio frequency identification signal;
Wireless radio frequency identification signal to described reception carries out low-pass filtering;
Described wireless radio frequency identification signal through filtering is descended sampling;
Wireless radio frequency identification signal and ideal signal to described sampling compare, to produce in order to judge the signal of high low value; And
Be converted to square-wave signal in order to the signal of judging high low value according to its value with described.
23, method according to claim 22, the step that it is characterized in that wherein said reception is for receiving the wireless radio frequency identification signal of two phase phasic differences, 90 degree.
24, method according to claim 22 is characterized in that further comprising the following step:
Select decoded result correct and have the signal of its square-wave signal of more powerful wireless radio frequency identification signal according to the decoded result of described two wireless radio frequency identification signals and watt level as follow-up computing.
25, method according to claim 22 is characterized in that further comprising the following step:
Described square-wave signal is decoded according to the standard of electric product coding association.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101947333A CN101452520A (en) | 2007-11-29 | 2007-11-29 | Signal processor for receiving wireless radio frequency identification signal and method thereof |
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| CNA2007101947333A CN101452520A (en) | 2007-11-29 | 2007-11-29 | Signal processor for receiving wireless radio frequency identification signal and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654899A (en) * | 2011-03-04 | 2012-09-05 | 上海华虹集成电路有限责任公司 | RFID (Radio Frequency Identification Devices) signal monitoring and analyzing tool and method |
| CN103795428A (en) * | 2014-01-24 | 2014-05-14 | 杭州电子科技大学 | Novel decoder in radio frequency identification data communication |
| CN106143359A (en) * | 2015-04-15 | 2016-11-23 | 瑞昱半导体股份有限公司 | Signal transmission method and use the communication system of its method |
| CN109558757A (en) * | 2017-09-25 | 2019-04-02 | 深圳市金溢科技股份有限公司 | Vehicle identification system, electronic label read/write and multi tate decode matching process |
-
2007
- 2007-11-29 CN CNA2007101947333A patent/CN101452520A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654899A (en) * | 2011-03-04 | 2012-09-05 | 上海华虹集成电路有限责任公司 | RFID (Radio Frequency Identification Devices) signal monitoring and analyzing tool and method |
| CN103795428A (en) * | 2014-01-24 | 2014-05-14 | 杭州电子科技大学 | Novel decoder in radio frequency identification data communication |
| CN103795428B (en) * | 2014-01-24 | 2015-08-26 | 杭州电子科技大学 | Decoder in radio frequency identification data communication |
| CN106143359A (en) * | 2015-04-15 | 2016-11-23 | 瑞昱半导体股份有限公司 | Signal transmission method and use the communication system of its method |
| CN106143359B (en) * | 2015-04-15 | 2019-01-04 | 瑞昱半导体股份有限公司 | Signal transmission method and the communication system for using its method |
| CN109558757A (en) * | 2017-09-25 | 2019-04-02 | 深圳市金溢科技股份有限公司 | Vehicle identification system, electronic label read/write and multi tate decode matching process |
| CN109558757B (en) * | 2017-09-25 | 2021-08-31 | 深圳市金溢科技股份有限公司 | Vehicle identification system, electronic tag reader-writer and multi-rate decoding matching method |
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Open date: 20090610 |