Active RFID anti-collision method based on DSSS

Abstract

The invention discloses an active RFID anti-collision method based on the DSSS. An RFID reader comprises a plurality of accesses with the parallel spread spectrum and dispreading spectrum processing capacity, a PN0 spread spectrum sequence code is a rousing spread spectrum sequence code and is defined as a zeroth access, and other spread spectrum sequence codes are anti-collision sequence codes and are sequentially defined as first to nth accesses. The method specifically comprises the steps that based on the DSSS, the different spread spectrum sequence codes are used for receiving and transmitting data, and the characteristics of the spread spectrum sequence codes are utilized. The RFID reader comprises the multiple accesses with the parallel spread spectrum and dispreading spectrum processing capacity, and labels communicate with the RFID reader through the same radio frequency chip with the spread spectrum function. The active RFID anti-collision method based on the DSSS integrates the advantages of the code division technology and the time division technology, and improves the inventory taking efficiency and speed of the mass labels.

Description

technical field [0001] The invention belongs to the technical field of wireless radio frequency communication, and in particular relates to an active RFID anti-collision method based on DSSS (Direct Sequence Spread Spectrum). Background technique [0002] Radio Frequency Identification (RFID) technology is a technology that realizes non-contact automatic identification through spatial coupling of radio frequency signals (alternating magnetic field or electromagnetic field). The core components of the radio frequency identification system are the reader (receives information from the electronic tag, and can realize the upper management of the entire application system by connecting with the computer) and the electronic tag (remotely wirelessly transmits the information stored by itself to the reader to identify Electronic tags represent the identity of items, people and appliances). [0003] When the radio frequency identification system is working, there may be more than on...

AI Technical Summary

Problems solved by technology

[0005] When processing these electronic tags in an active RFID system, it is necessary to read hundreds or even thousands of electronic tags accurately within a few seconds, but the anti-collision algorithms of RFID readers in the prior art all use time-division technology to To prevent collisions, in the case of a large number of labels, simply using time-division technology will greatly prolong the time for identifying labels, and at the same time, the situation of missing and wrong labels is more obvious

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