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Data encoding method for passive radio frequency identification from reader-writer to tag

A data encoding, passive radio frequency technology, applied in the field of radio frequency identification communication, to achieve the effect of narrow bandwidth, solve energy supply, and improve data transmission rate

Inactive Publication Date: 2012-09-19
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a data encoding method from a reader to a tag for passive radio frequency identification to solve the problem of energy supply of passive tags and improve the data transmission rate in view of the deficiencies in the prior art

Method used

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  • Data encoding method for passive radio frequency identification from reader-writer to tag
  • Data encoding method for passive radio frequency identification from reader-writer to tag
  • Data encoding method for passive radio frequency identification from reader-writer to tag

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] figure 1 A schematic diagram of data symbols of a specific embodiment of PIE encoding is given. exist figure 1 Among them, the data "1" is represented by a high level with a length of 1.5Ts followed by a low level with a length of 0.5Ts; data "0" is represented by a high level with a length of 0.5Ts followed by a low level with a length of 0.5Ts express. Wherein, Ts is a unit reference time length, which is determined according to the specific requirements of the data transmission rate.

[0022] figure 2 It is a schematic diagram of data symbols using a specific embodiment of the present invention, in figure 2 middle:

[0023] The binary data packet "00" is encoded as: a high level with a length of L1=0.5Ts followed by a low level with a length of L=0.5Ts;

[0024] The binary data packet "01" is encoded as: a high level with a ...

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Abstract

The invention discloses a data encoding method for passive radio frequency identification from a reader-writer to a tag. The method comprises the following steps of: grouping binary data to be sent according to two bits; and if the binary data to be sent is an odd bit, adding '0' into the binary data and then grouping. Compared with the existing methods, according to the method disclosed by the invention, under the condition that a data transmission speed is the same, the bandwidth occupied by a signal is narrower and the spectrum effectiveness is better; the unit bit can provide more energy for the tag and the problem of supplying passive tag energy can be better solved; and on the premise that the bandwidth occupied by the signal is the same, the data transmission speed can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification communication, and in particular relates to a data encoding method used in a passive radio frequency identification system from a reader to a label. Background technique [0002] Radio frequency identification communication technology is a non-contact automatic identification technology. The RFID system is mainly composed of tags, readers and computer network systems. The reader communicates with the tag through radio frequency signals, obtains the identification information stored on the tag, and at the same time manages and transmits the read tag information through the computer network system. [0003] RFID systems can be divided into passive RFID systems and active RFID systems. In the passive RFID system, the reader uses the encoded and modulated radio frequency signal to send information to the tag. On the one hand, it provides energy to the tag through the radio freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K17/00
Inventor 李建成王宏义杨青李聪
Owner NAT UNIV OF DEFENSE TECH
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