Multi-label anticollision algorithm in high-frequency/ultrahigh frequency RFID recognition system

Abstract

The invention provides a multi-label anti-collision arithmetic in a high frequency / super high frequency RFID identification system, the arithmetic comprises the steps that: resetting; a read-write machine sends a label inquiring order; a responder judges the received inquiring order; the read-write machine receives and judges the label inquiring response; the read-write machine processes the data of the responder; pd value is set as 1, Q value is set as Q; the read-write machine sends an inquiry variation order and the responder returns, the read-write machine receives and judges the label inquiring response; the read-write machine processes the data of the responder; the arithmetic can circulate in a manner of rapid elimination and has high practical identification efficiency to the labels taking place the collision, which can rapidly reduce the number of responders within the work range of the read-write machine; in one hand, the identification efficiency is enhanced by rapidly reducing the number of the responder, in other hand, the identification quality can be further promoted by diminishing the disturbance of electromagnetic environment within the work range of the read-write machine.

Description

technical field [0001] The invention relates to radio frequency (RFID) multi-label identification technology in the field of communication technology, in particular to a multi-label anti-collision algorithm in a high-frequency / ultra-high frequency radio frequency (RFID) identification system. Background technique [0002] At present, HF / UHF RFID technology is mainly applied in two frequency bands: 13.56MHz and 900MHz, and a small part is in the 2.45GHz frequency band, but relatively few. 13.56MHz frequency band radio frequency identification products are mainly used in the field of short-distance identification, which can support strong encryption and decryption capabilities, but the typical use distance is generally within 10cm, and even the long-distance 13.56MHz tag identification distance is no more than 1.5m; The 900MHz frequency band radio frequency identification products can reach a maximum recognition distance of more than 10m, but it is difficult to add encryption ...

AI Technical Summary

Problems solved by technology

But in the actual system, its algorithm efficiency is relatively low

If there are too many transponders and not enough time slots, then the probability of data collision is too high and the time required is too long

In this way, if multiple transponders stay in the working range of the reader for too short a time, the recognition rate will be correspondingly low

[0007] However, the basic binary search algorithm is inefficient due to its poor anti-interference ability and easy misreading of data.

hard to accomplish

However, the time-slotted ALOHA algorithm has great limitations. If the number of transponders is too large, the probability of data collision will be too high, and the time required will be too long.

Images