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Ultrahigh-frequency passive tag real-time parallel decoding method, storage medium and equipment

A decoding method and passive technology, applied in the field of Internet of Things sensing, can solve problems such as error-prone decoding and communication failure, and achieve the effect of improving communication throughput

Active Publication Date: 2021-01-12
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] (2) Many dynamic factors (such as label movement or environment changes) will introduce unpredictable errors, which makes decoding error-prone
However, even if only one bit is incorrectly decoded, the communication fails

Method used

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  • Ultrahigh-frequency passive tag real-time parallel decoding method, storage medium and equipment

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Embodiment Construction

[0038] A real-time parallel decoding method for UHF passive tags of the present invention comprises the following steps:

[0039] S1, multi-reference tags selectively read tags, send two SELECT commands to select two reference tags, and set the Query command to select the same time slot to respond;

[0040] Selective reading of multiple reference tags adopts the ID-based selective reading method designed in the current commercial EPC C1G2 protocol. Send a SELECT command to select the tag you want to communicate with, and then set parameters in the Query command to achieve efficient reading of the selected tag.

[0041] Simplifying the SELECT command and the Query command into two tuples S and Q looks like this:

[0042]

[0043] Wherein, the element MemBank in the SELECT command specifies the considered tag memory bank (for example, EPC memory bank, USER memory bank, etc.). The tuple S indicates that tags with the same m-mask in MemBank b will perform operation a. In the...

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Abstract

The invention discloses an ultrahigh-frequency passive tag real-time parallel decoding method, a storage medium and equipment. The method comprises the steps: selectively reading a tag through a plurality of reference tags, transmitting two SELECT commands to select two reference tags, and setting a Query command to select the same time slot for response; decoding the collision signal by using a reverse reasoning method, detecting a lead code, detecting the lead code by using a cross-correlation method, comparing the received signal with a constructed lead code sequence by using a sliding window, positioning a lead code part and finding out a starting point of an RN16 part; decoding the conflicting RN16, deducing the symbol of the din through the dout adjacent to the din, then decoding thelabel RN16 by using a single label decoding mechanism, and generating a random number as an ACK command by using the decoded RN16; sending an ACK command, and proving that the EPC replied by the label successfully realizes decoding. According to the method disclosed in the invention, the communication between the reader and the label can be efficiently realized, and the communication throughput rate is improved.

Description

technical field [0001] The invention belongs to the technical field of Internet of Things sensing, and in particular relates to a real-time parallel decoding method, storage medium and equipment of an ultra-high frequency passive tag. Background technique [0002] With the widespread deployment of radio frequency identification in many applications such as retail, warehousing, logistics, etc., passive radio frequency technology (RFID) technology has become a very promising solution for applications such as project management, object tracking, and human perception. Using UHF passive RFID tag communication, when there are multiple tags waiting to communicate in an inventory, different tags will choose the same time slot to respond, which will cause conflicts at the receiver. For a commercial reader, it will drop the conflicting signal and fail to read any of the conflicting tags. [0003] Different from existing offline parallel decoding methods, real-time parallel decoding f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10G06N5/04
CPCG06K7/10019G06N5/042
Inventor 王鸽丁菡朱琪琦惠维赵鲲赵衰王志赵季中
Owner XI AN JIAOTONG UNIV
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