Coding and decoding circuit of super high frequency radio frequency personal identification system

An identity recognition and ultra-high frequency technology, applied in the field of RFID communication, can solve the problems of unguaranteed security and reliability, affecting large-scale commercial applications, signal multipath interference, etc., to improve data processing capabilities and improve successful reading. The effect of taking rate and reducing communication time

Inactive Publication Date: 2009-05-27
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many successful application cases, the UHF RFID system has the problems of channel attenuation, signal multipath interference, and multi-tag collision due to the large reading and writing distance. The safety and reliability cannot be guaranteed, which seriously affects its large-scale business applications

Method used

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  • Coding and decoding circuit of super high frequency radio frequency personal identification system
  • Coding and decoding circuit of super high frequency radio frequency personal identification system
  • Coding and decoding circuit of super high frequency radio frequency personal identification system

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Embodiment 1

[0024] The present invention considers as figure 1 The radio frequency identification system consists of two parts: a reader and an electronic tag. When the electronic tag enters the effective range of the reader, the two parties can communicate through the electromagnetic field according to a certain agreement. Readers and electronic tags can be divided into analog circuits and digital baseband parts structurally. The analog circuit of the tag includes a voltage regulator circuit and a radio frequency interface circuit. The voltage regulator circuit is responsible for obtaining energy from the radio frequency signal and providing it to the digital baseband part of the tag. The radio frequency interface circuit is responsible for the modulation, transmission, reception and demodulation of the radio frequency signal. The digital baseband part includes codec circuit, clock circuit, system state machine and storage system. The encoding and decoding circuit converts the return-t...

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PUM

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Abstract

The invention discloses a coding and decoding circuit for a system of ultra-high frequency radio frequency identification (UHF RFID). Every time when error codes are found, the coding and decoding circuit based on the prior cyclic redundancy check (CRC) circuit resends, thus frequency of communication between a reader-writer and a tag can be increased in the situation of long distances of reading and writing and serious noise interference. If the speed of reading and writing is definite, time for successfully reading once is certainly extended, thereby influencing practicability and reliability of the UHF RFID system in the situation of reading and writing at high speed. To solve the problem, the invention is provided with a convolution error correcting code, adopts concatenation connection with the CRC circuit to reduce frequency of reading and writing, so as to improve the successful reading rate of the system in certain time. The CRC circuit of the invention is a parallel circuit with compact conformation and fast arithmetic designed based on FPGA, thereby further reducing time of communication between the reader and the tag, and increasing the amount of tag identification in unit time.

Description

technical field [0001] The invention belongs to the field of RFID communication, and relates to an encoding and decoding circuit of an ultra-high frequency radio frequency identification system. Background technique [0002] Ultra-high frequency radio frequency identification technology has a long identification distance, and has been more and more used in logistics management, transportation management, factory workpiece production control and other fields, resulting in huge economic benefits. Although there are many successful application cases, the UHF RFID system has the problems of channel attenuation, signal multipath interference, and multi-tag collision due to the large reading and writing distance. The safety and reliability cannot be guaranteed, which seriously affects its large-scale commercial applications. Therefore, the research and improvement of UHF radio frequency system is of great significance, especially the design of UHF radio frequency identification s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00H03M13/11
Inventor 何怡刚赵晶阳璞琼
Owner HUNAN UNIV
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