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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, reducing the spectrum efficiency, and long transmission time per unit bit, so as to solve the problem of energy supply, ensure synchronization, and facilitate implementation Effect

Active Publication Date: 2013-02-27
TIANJIN INST OF ADVANCED TECH
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Problems solved by technology

However, due to the need to introduce a longer high level to represent the data "1", the transmission time of the unit bit is longer, which reduces the data transmission rate of the reader terminal and reduces the spectral efficiency.

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] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] According to an embodiment of the present invention, a data encoding method for a passive radio frequency identification system is provided. First, the reader groups the binary data to be sent into groups of two bits. If the binary data to be sent is an odd number of bits, it needs to be supplemented with "0" before grouping. After grouping, encode each group of data in the following way (refer to figure 2 ):

[0034] The binary data packet "00" is encoded as: length L 1 =T c The length of the high level is L=T c low level;

[0035] The binary data packet "01" is encoded as: length L 2 = 2T c The length of the high level is L=T c low level;

[0036] The binary data packet "11" is encoded as: length L 3 = 3T c The length of the high level is L=T c low level;

[0037] The binary data packet "10" is encoded as: length L 4 = 4T c The ...

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Abstract

The invention provides a data coding method for a passive radio-frequency identification system. The method comprises the following steps: 1) dividing to-be-transmitted binary data into groups each having two bits; and 2) indicating each of the following four types of data groups using data symbols which are constituted by a high level followed by a low level: '0 0', '0 1', '1 1' and '1 0', wherein the total length of the high levels is different from the total length of the low levels of the data symbols indicative of the data groups '0 0', '0 1', '1 1' and '1 0'. According to the invention, the unit bit provides more energy to the tags to better ensure synchronization of the reader / writer-side data at the tag end, and the method is convenient to implement.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification communication, in particular, the invention relates to a data encoding method for a passive radio frequency identification system. Background technique [0002] Radio Frequency Identification (RFID) communication technology is a non-contact automatic identification technology. The RFID system is mainly composed of tags, readers and computer networks. 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. [0003] 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 reader, while the tags of active RFID syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M5/08G06K7/00
Inventor 李建成王宏义杨青谷晓忱李松亭李聪
Owner TIANJIN INST OF ADVANCED TECH
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