CN112926347B - Self-adaptive control method based on 4QAM passive tag backscatter power - Google Patents
Self-adaptive control method based on 4QAM passive tag backscatter power Download PDFInfo
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- CN112926347B CN112926347B CN202110341410.2A CN202110341410A CN112926347B CN 112926347 B CN112926347 B CN 112926347B CN 202110341410 A CN202110341410 A CN 202110341410A CN 112926347 B CN112926347 B CN 112926347B
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- 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
- G06K7/0095—Testing the sensing arrangement, e.g. testing if a magnetic card reader, bar code reader, RFID interrogator or smart card reader functions properly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the field of a passive tag backscatter power self-adaptive control method, and discloses a self-adaptive control method based on 4QAM passive tag backscatter power, which comprises the steps of firstly measuring the distance between a tag and a reader, and measuring the angle between the tag and the reader and the packet loss rate; the distance required by the measurement tag and the reader is solved according to the backscattering given power, the backscattering power, the tag antenna gain and the reader antenna gain, and the packet loss rate can be known by the reader when backscattering is carried out; then sending the data to a label processor according to the measured data; and finally, when the packet loss rate of the detected backscatter link is small, the minimum backscatter power is calculated, otherwise a backscatter signal is properly increased.
Description
Technical Field
The invention relates to the field of a passive tag backscatter power self-adaptive control method, in particular to a self-adaptive control method based on 4QAM passive tag backscatter power.
Background
In order to improve the throughput between the reader and the tag, a 4QAM tag is designed, but since the government regulates the transmission power of the reader, the energy obtained by the passive tag is obtained from the electromagnetic carrier transmitted to the tag by the reader, the backscatter power of the tag is further influenced by the limitation of the receiving power of the tag, a part of the power received by the tag is used for the operation of a tag circuit, a part of the power reflects the backscatter signal to the reader in the form of electromagnetic waves, and the power of the backscatter signal is limited, so that the RSSI of the backscatter signal and the communication distance between the backscatter signal and the reader are limited.
At present, a power waste phenomenon exists in a 4QAM backscattering signal, limited energy absorbed by a tag from a carrier wave is not fully utilized, and in order to improve the energy use efficiency of the tag, the backscattering signal power is purposefully controlled according to requirements, so that the energy use efficiency of the 4QAM tag can be greatly improved.
Disclosure of Invention
In order to solve the problem that energy is wasted in the backscattering process of a 4QAM tag in the communication process of the prior art of the uplink radio frequency of a tag and a reader, and a tag with limited absorbed energy has the big defect, the backscattering power generated by a tag circuit needs to be adjusted in a tag processor module, and reasonable power is given to reflect the backscattering power back, so that the energy utilization of the tag is maximized.
The technical scheme of the invention is as follows:
a self-adaptive control method based on backscattering power of a 4QAM passive tag comprises the following steps:
s1: measuring the distance between the tag and the reader, the angle between the tag and the reader and the packet loss rate;
s2: the distance between the measuring tag and the reader is obtained according to the backscattering power, the power during backscattering, the antenna gain of the tag and the antenna gain of the reader, and the packet loss rate can be known by the reader during backscattering;
s3: sending the data measured according to the S2 to a label processor;
s4: when the packet loss rate of the detected backscattering link is small, the minimum backscattering power is obtained, and a backscattering signal is sent by using the minimum energy; when the packet loss rate of the detected backscatter link is high, the backscatter signal should be properly increased due to the high influence of multipath interference, and then the backscatter power needs to be increased to ensure that the backscatter signal is reflected back to the reader.
Further, in the S1, the distance between the measurement tag and the reader is R, the angle between the measurement tag and the reader is θ, and the packet loss rate packloss and P under the multipath influence dr Is the back scattering power supply P received by the reader bS Is the power at the time of backscattering, gt is the antenna gain of the tag, gr is the antenna gain of the reader, wherein,
further, after the tag processor analyzes the data, the SP4T RF Switch selects a suitable impedance match, and then adjusts the power of the backscatter signal.
Further, the limited energy of the power utilization tag in the backscattering is reasonably controlled to improve the energy utilization rate of the system.
The beneficial effects of the invention at least comprise the following:
aiming at the problem that energy is wasted in the backscattering process of a 4QAM tag in the radio frequency communication process of an uplink of a tag and a reader, the invention has the great disadvantage of the tag with limited absorbed energy, and the tag processor module adjusts the backscattering power generated by a tag circuit by analyzing the position and the angle of the reader reflected back and gives reasonable power to reflect the backscattering power back, so that the energy utilization of the tag is maximized.
Drawings
Fig. 1 is a schematic block diagram of the principle of an adaptive control method based on the backscattering power of a 4QAM passive tag in accordance with the present invention.
Fig. 2 is a schematic view of a 4QAM passive tag backscatter power based adaptive control method scenario according to the present invention.
Fig. 3 is a schematic diagram of switching different impedances by an adaptive control method SP4T based on the backscatter power of a 4QAM passive tag according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in fig. 1-3, the present invention provides
A self-adaptive control method based on backscattering power of a 4QAM passive tag comprises the following steps:
s1: measuring the distance between the tag and the reader, the angle between the tag and the reader and the packet loss rate;
s2: the distance required by the measurement tag and the reader is solved according to the backscattering given power, the backscattering power, the tag antenna gain and the reader antenna gain, and the packet loss rate can be known by the reader when backscattering is carried out;
s3: sending the data measured according to the S2 to a label processor;
s4: when the packet loss rate of the detected backscattering link is small, the minimum backscattering power is obtained, and a backscattering signal is sent by using the minimum energy; when the packet loss rate of the detected backscatter link is high, the backscatter signal should be properly increased due to the high influence of multipath interference, and then the backscatter power needs to be increased to ensure that the backscatter signal is reflected back to the reader.
Specifically, the distance R between the tag and the reader, the angle θ, and the packet loss rate packloss (multipath influence) are measured first; according to
P dr Is the back-scattered power, P, received by the reader bS For the power in the backscattering, gt and Gr are antenna gains of the tag and the reader, so that the required distance R between the tag and the reader to be measured can be obtained, and the packet loss rate can be known by the reader when backscattering is performed.
The measured data are sent to a tag processor MSP430, the minimum backscattering power is calculated when the detected backscattering link packloss is small, and a backscattering signal can be sent with the minimum energy; when a larger packloss is detected, the influence of multipath interference is larger, and the RSSI of the backscatter signal can be properly increased, at which time the backscatter power needs to be increased to ensure that the backscatter signal is reflected back to the reader.
After the tag processor MSP430 analyzes the data, the SP4T RF Switch selects an appropriate impedance match, so as to adjust the power of the backscatter signal.
The above description is only an embodiment of the present invention, and the present invention analyzes the position and angle of the reflected reader, and the tag processor module adjusts the backscatter power generated by the tag circuit to provide a reasonable power to reflect it back, so that the energy utilization of the tag is maximized. The invention is not limited to the claims, and all equivalent structures or equivalent processes that can be directly or indirectly applied to other related technical fields using the contents of the specification and the drawings are included in the scope of the invention.
Claims (2)
1. A self-adaptive control method based on backscattering power of a 4QAM passive tag is characterized by comprising the following steps:
s1: measuring the distance between the tag and the reader, the angle between the tag and the reader and the packet loss rate;
s2: the distance required by the measurement tag and the reader is solved according to the backscattering given power, the backscattering power, the tag antenna gain and the reader antenna gain, and the packet loss rate can be known by the reader when backscattering is carried out;
s3: sending the data measured according to the S2 to a label processor;
s4: when the packet loss rate of the detected backscatter link is low, the minimum backscatter power is obtained, and a backscatter signal is sent with the minimum energy; when the packet loss rate of the detected backscatter link is high, the backscatter signal is properly increased due to high multipath interference, and then the backscatter power needs to be increased to ensure that the backscatter signal is reflected back to the reader;
after the tag processor analyzes data, the SP4T RF Switch selects proper impedance matching, the power during backscattering signals is further adjusted, and the energy utilization rate of the system is improved by reasonably controlling the limited energy of the tag during backscattering.
2. The adaptive control method for backscattering power of a 4QAM passive tag as claimed in claim 1, wherein the backscattering power in S2, the power in backscattering, the antenna gain of the tag and the antenna gain of the reader satisfy the following equations:
wherein, P dr Is the back scattering power P received by the reader bS Is the power in backscatter, G t Antenna gain, G, for a tag r Is the antenna gain of the reader.
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| US7817014B2 (en) * | 2004-07-30 | 2010-10-19 | Reva Systems Corporation | Scheduling in an RFID system having a coordinated RFID tag reader array |
| US7170412B2 (en) * | 2004-08-31 | 2007-01-30 | Symbol Technologies, Inc. | Angle of position object location system and method |
| CN1968037B (en) * | 2006-06-09 | 2010-10-06 | 华为技术有限公司 | Power control method in communication method and its system |
| CN101442346A (en) * | 2007-11-20 | 2009-05-27 | 中兴通讯股份有限公司 | Method for implementing backward power control |
| US20090149136A1 (en) * | 2007-12-05 | 2009-06-11 | Broadcom Corporation | Terminal with Programmable Antenna and Methods for use Therewith |
| KR20170081809A (en) * | 2016-01-04 | 2017-07-13 | 한국전자통신연구원 | RFID tag and controlling method |
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