CN106375255B - PR_ASK modulator approach based on FPGA - Google Patents
PR_ASK modulator approach based on FPGA Download PDFInfo
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- CN106375255B CN106375255B CN201610792605.8A CN201610792605A CN106375255B CN 106375255 B CN106375255 B CN 106375255B CN 201610792605 A CN201610792605 A CN 201610792605A CN 106375255 B CN106375255 B CN 106375255B
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- signal
- ask
- transmitting signal
- integer
- label
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The PR_ASK modulator approach based on FPGA that the invention discloses a kind of.It includes determining transmitting signal content, and PIE coding, PR_ASK modulates integer, digital quantization, baseband filtering, digital-to-analogue conversion, carrier modulation.The present invention uses the modulation system modulate emission signal of DSB_ASK, it greatly reduced the pulse width of low energy signal, it is equivalent to the energy for improving and sending label, label can receive more energy in farther distance, the level that modulation depth reaches 90% or more can be easily realized simultaneously, improve the operating distance of reader and label, the channel occupancy bandwidth of signal can be effectively reduced simultaneously, optimize channel utilization, it not will receive the interference of aerial other electromagnetic signals, while other signals will not be influenced.
Description
Technical field
The invention belongs to technical field of RFID more particularly to a kind of PR_ASK modulator approaches based on FPGA.
Background technique
In radio frequency identification (RFID) technology, passive label is needed since itself is without battery by ultrahigh frequency reader-writer
The carrier energy of transmission works.Therefore when reader and label communication, the carrier energy that reader provides is more abundant, and label receives
Signal it is more clear, the effect for returning to label signal is better.Under same transmission power, the transmitting signal that label receives is got over
Excellent, the distance of label return signal is remoter, it is meant that reader more label interaction distance is longer.ISO/IEC 18000-6C's
In agreement, three kinds of contents about transmitting signal modulation are mentioned to, are DSB_ASK, SSB_ASK and PR_ASK respectively.Wherein
For PR_ASK compared with DSB_ASK, SSB_ASK modulated RF envelope, the pulse width of the modulated RF envelope of PR_ASK is narrow very much,
That is the low energy transmission time of the modulation system want it is short very much.Under identical transmission power, PR_ASK can be preferably mark
Label provide carrier energy, to keep the interaction distance between reader and label farther, i.e., are worked using the reader of PE_ASK
Apart from longer.But in existing design of read write system, it can believe because of separator using the implementation of PR_ASK coding is again more
Number too short limitation, label can not effectively wake up, and influence label and make an inventory ability.
Summary of the invention
Goal of the invention of the invention is: in order to solve problem above existing in the prior art, the invention proposes one kind
The PR_ASK modulator approach based on FPGA of the operating distance of reader can effectively be improved.
The technical scheme is that a kind of PR_ASK modulator approach based on FPGA, comprising the following steps:
A, it is instructed according to the transmission of host computer, determines transmitting signal content；
B, PIE coding is carried out to transmitting signal in step A in the way of PIE coding；
C, PR_ASK is carried out to the transmitting signal after PIE coding in step B and modulates integer；
D, digital quantization is carried out to the transmitting signal after integer in step C；
E, baseband filtering is carried out to the transmitting signal after quantifying in step D；
F, filtered digital baseband signal is subjected to digital-to-analogue conversion, obtains analog baseband signal；
G, it is high-frequency signal by carrier modulation by analog baseband signal, obtains the modulated transmitting signal of PR_ASK.
Further, the step B also wraps transmitting signal progress PIE coding in step A in the way of PIE coding
It includes: in transmitting signal content front end addition separator and targeting signal content.
Further, the step C includes to the transmitting signal progress PR_ASK modulation integer after PIE coding in step B
Below step by step:
C1, according to signal flipped form, the transmitting signal after PIE coding is overturn, again by original signal (0,1) value
It is assigned a value of (- 1,1) value；
C2, separator part signal is overturn, the parameter value of separator low magnitude portion is assigned a value of 0.
Further, the step D carries out digital quantization to the transmitting signal after integer in step C specifically: utilizes more
BIT data replace the parameter values such as -1,0,1 emitted in signal after integer.
The beneficial effects of the present invention are: the present invention uses the modulation system modulate emission signal of DSB_ASK, greatly reduce
The pulse width of low energy signal, is equivalent to the energy for improving and sending label, and label can be received in farther distance
More energy, while can easily realize the level that modulation depth reaches 90% or more, improve reader and label
Operating distance, while the channel occupancy bandwidth of signal can be effectively reduced, optimize channel utilization, not will receive it is aerial its
The interference of his electromagnetic signal, while other signals will not be influenced.
Detailed description of the invention
Fig. 1 is the PR_ASK modulator approach flow diagram of the invention based on FPGA.
Fig. 2 is PR_ASK modulation principle schematic diagram in the present invention.
Fig. 3 is simulation result schematic diagram in the embodiment of the present invention.
Fig. 4 is transmitting signal spectrum signal schematic representation in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, being the PR_ASK modulator approach flow diagram of the invention based on FPGA.It is a kind of based on FPGA's
PR_ASK modulator approach, comprising the following steps:
A, it is instructed according to the transmission of host computer, determines transmitting signal content；
B, PIE coding is carried out to transmitting signal in step A in the way of PIE coding；
C, PR_ASK is carried out to the transmitting signal after PIE coding in step B and modulates integer；
D, digital quantization is carried out to the transmitting signal after integer in step C；
E, baseband filtering is carried out to the transmitting signal after quantifying in step D；
F, filtered digital baseband signal is subjected to digital-to-analogue conversion, obtains analog baseband signal；
G, it is high-frequency signal by carrier modulation by analog baseband signal, obtains the modulated transmitting signal of PR_ASK.
There are three types of DSB_ASK, SSB_ASK and PR_ for the modulation system being mentioned in ISO/IEC 18000-6C agreement
ASK, the present invention be accomplished that a kind of special PR_ASK modulation system, optimize the design of separator part, can be better
It realizes and sends Signal coding, improve reader operating distance.
As shown in Fig. 2, for PR_ASK modulation principle schematic diagram in the present invention.As shown in figure 3, to be imitated in the embodiment of the present invention
True result schematic diagram.As shown in figure 4, to emit signal spectrum signal schematic representation in the embodiment of the present invention.The present invention is from host computer
After the order for receiving transmission, PIE coding is carried out in the way of PIE coding；Integer is carried out to PIE encoded signal, according to letter
The form of number overturning, overturns PIE signal, and the signal after integer is carried out assignment (- 1,1) again；Specially treated separator portion
Separator parameter value is assigned a value of 0 by sub-signal value；Digital quantization is carried out to the transmitting signal after assignment again, that is, uses more BIT
Data replace the parameter values such as -1,0,1 in original signal, raise signal level；Low-pass filter is designed, transmitting signal passes through low pass
High frequency noise components can be reduced after filter, integer emits signal；It can produce satisfaction after digital signal is converted by D A
The analog baseband signal that PR_ASK is required finally carries out carrier modulation to analog baseband signal, has just obtained PR_ASK modulation
Emit signal.
In step, the present invention packages according to the transmission of host computer instruction, determines in the transmitting signal for needing to send
Hold.
In stepb, the rule that the present invention is encoded according to PIE carries out PIE coding to transmitting signal, and in transmitting signal
Content head end adds separator and targeting signal content.
In step C, the present invention in step B PIE coding after transmitting signal carry out PR_ASK modulate integer, including with
Under step by step:
C1, according to signal flipped form, the transmitting signal after PIE coding is overturn, again by original signal (0,1) value
It is assigned a value of (- 1,1) value；
C2, separator part signal is overturn, the parameter value of separator low magnitude portion is assigned a value of 0.
In step C1, the transmitting signal data part after the present invention encodes PIE carries out integer, is believed according to data 0,1
Number inverse values, integer, energizing signal value, and original signal (0,1) value is assigned a value of (- 1,1) value, signal again are carried out to signal
Meet positive and negative attribute.
In step C2, the present invention is to special integer processing is carried out to separator part, by the signal of separator part
It is overturn, and the parameter value of separator low magnitude portion is assigned a value of 0, to extend the width of separator.
Since high level in signal and low level ratio are not much different, the energy provided to label can be relatively fewer, together
When difficult to realize modulation depth reach 90% or more, match label relative reduction, tag return ability reduces, finally communicate away from
From greatly shortening；The present invention greatly reduced the pulse width of low energy signal, phase by using the modulation system of PR_ASK
When in improving the energy for sending label, label can receive more energy in farther distance, while can be easy to
Realization modulation depth reach 90% or more level, improve the operating distance of reader and label.
In step D, the present invention carries out the quantization of data parameters for the signal after integer, is replaced using more BIT data
The parameter values such as -1,0,1 in transmitting signal after integer, carry out Digital Signal Processing, raise signal level；The range root of quantization
It is determined according to external DAC.That sample in the present invention is 12 DAC, so by signal quantization at the number of (- 1500,1500)
Word signal, the part for being assigned a value of 0 is still 0.
In step E, the signal after quantization is carried out baseband filtering by low-pass filter by the present invention, reduces high-frequency noise
Component；The filtering parameter setting of low-pass filter is determined according to the frequency of baseband signal.The present invention sets baseband signal as 80K,
Filter frequencies value is then set as 40K.
In step F, above-mentioned signal conversion process is realized inside FPGA, and the present invention is again by digital baseband signal
D/A conversion is carried out by DAC, obtains that treated and meet the analog baseband signal of PR_ASK requirement.
In step G, analog baseband signal is carried out carrier modulation by modulator by the present invention, by analog baseband signal tune
It is made as high-frequency signal, is specially modulated on the carrier wave of 900MHz, the modulated transmitting signal of PR_ASK is obtained.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (2)
1. a kind of PR_ASK modulator approach based on FPGA, which comprises the following steps:
A, it is instructed according to the transmission of host computer, determines transmitting signal content；
B, to signal progress PIE coding is emitted in step A in the way of PIE coding, in the addition point of transmitting signal content front end
Every symbol and targeting signal content；
C, in step B PIE coding after transmitting signal carry out PR_ASK modulate integer, including it is following step by step:
C1, according to signal flipped form, the transmitting signal after PIE coding is overturn, by original signal (0,1) value again assignment
For (- 1,1) value；
C2, separator part signal is overturn, the parameter value of separator low magnitude portion is assigned a value of 0；
D, digital quantization is carried out to the transmitting signal after integer in step C；
E, baseband filtering is carried out to the transmitting signal after quantifying in step D；
F, filtered digital baseband signal is subjected to digital-to-analogue conversion, obtains analog baseband signal；
G, it is high-frequency signal by carrier modulation by analog baseband signal, obtains the modulated transmitting signal of PR_ASK.
2. the PR_ASK modulator approach based on FPGA as described in claim 1, which is characterized in that the step D is in step C
Transmitting signal after integer carries out digital quantization specifically: using in the transmitting signal after more BIT data replacement integer -1,0,
1 parameter value.
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| CN201610792605.8A CN106375255B (en) | 2016-08-31 | 2016-08-31 | PR_ASK modulator approach based on FPGA |
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| CN106375255B true CN106375255B (en) | 2019-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107862228B (en) * | 2017-11-03 | 2021-01-15 | 锐捷网络股份有限公司 | Signal processing method and RFID reader |
| CN109474554B (en) * | 2018-10-11 | 2021-08-17 | 锐捷网络股份有限公司 | PR-ASK modulation method and device |
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| CN1496076A (en) * | 2002-09-18 | 2004-05-12 | �ձ����ŵ绰��ʽ���� | Data communication method, data transmitting equipment, data receiver and data transmitting program |
| CN101673195A (en) * | 2009-09-25 | 2010-03-17 | 中兴通讯股份有限公司 | Information transmission method, system and device in radio frequency identification |
| CN102947838A (en) * | 2010-01-27 | 2013-02-27 | Rem控股3有限责任公司 | Card reader device and method of use |
| CN105900348A (en) * | 2014-01-13 | 2016-08-24 | 克莱尔瓦扬技术有限公司 | Rf system using pr-ask with orthogonal offset |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10306689A1 (en) * | 2003-02-11 | 2004-08-19 | Atmel Germany Gmbh | Circuit arrangement for signal detection |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1496076A (en) * | 2002-09-18 | 2004-05-12 | �ձ����ŵ绰��ʽ���� | Data communication method, data transmitting equipment, data receiver and data transmitting program |
| CN101673195A (en) * | 2009-09-25 | 2010-03-17 | 中兴通讯股份有限公司 | Information transmission method, system and device in radio frequency identification |
| CN102947838A (en) * | 2010-01-27 | 2013-02-27 | Rem控股3有限责任公司 | Card reader device and method of use |
| CN105900348A (en) * | 2014-01-13 | 2016-08-24 | 克莱尔瓦扬技术有限公司 | Rf system using pr-ask with orthogonal offset |
Non-Patent Citations (1)
| Title |
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| UHF RFID读写器芯片发送链路数字基带电路设计;刘颜;《中国优秀硕士学位论文全文数据库》;20160315(第03期);第2.2部分，第3.2部分，第3.4.3部分第4.2、4.4、4.5部分，附图2-2，附图3-2 |
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