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Data coding method for passive radio frequency identification system

An identification system and data encoding technology, which is applied in the field of radio frequency identification communication, can solve the problems of reducing the data transmission rate of the reader-writer end, the unit bit transmission time becomes longer, etc., to solve the problems of energy supply, narrow bandwidth, and increase the data transmission rate. Effect

Inactive Publication Date: 2011-04-06
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, due to the introduction of a longer high level to represent the data "1", the transmission time of the unit bit becomes longer, and under the same channel bandwidth constraints, the data transmission rate of the reader terminal is reduced.

Method used

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  • Data coding method for passive radio frequency identification system
  • Data coding method for passive radio frequency identification system
  • Data coding method for passive radio frequency identification system

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Embodiment Construction

[0032] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but this does not constitute a limitation of the present invention.

[0033] In order to better understand the encoding method of the present invention, 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.

[0034] figure 2 It is a schematic diagram of data symbols of a specific embodiment adopting the technical solution 1 of the present invention, in figure 2 middle:

[0035] The binary data packet "00" is...

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Abstract

The invention provides a data coding method for a passive radio frequency identification system. The invention has the technical scheme that a reader-writer codes binary data to be sent by adopting the following steps of: dividing every two bits of the binary data into one group; coding each group of data into an assembly of a high level with certain length and a low level with fixed length; and distinguishing different binary data according to the length of the high level. The data coding method enables signals to have narrow occupied bandwidths and good frequency spectrum efficiency and can provide more energy for tags within a unit bit, thereby well solving the problem of energy supply of passive tags; in addition, compared with the traditional method, the data coding method can effectively enhance the transmission rate of the binary data under the condition that the occupied bandwidths of the signals are same, and supplies equal energy to the tags.

Description

[0001] technical field [0002] 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 [0003] Radio Frequency Identification (RFID) 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. [0004] RFID systems can be divided into two categories: passive RFID systems and active RFID systems, the main difference between the two is on the label side. The tags of passive RFID systems need to obtain energy from the radio frequency signal emitted by the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M5/08
Inventor 王宏义李建成许拔唐朝京任天鹏陈柯杨青
Owner NAT UNIV OF DEFENSE TECH
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